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Cirug’aoralenpacientesen
tratamientoconanticoagulantes
orales.Pautadeactuaci—n
AUTORES/AUTHORS
Mario Vicente Barrero (1)(4), Milan Knezevic (1),
Manuel Tapia Mart’n (2), Aurora Viejo Llorente (2),
Juan Carlos Orengo Valverde (3)(4), Francisco Garc’a
JimŽnez (1), Omar L—pez PŽrez (1), Sergio Dom’nguez
Sarmiento (1), JosŽ Manuel D’az Cremades (2)(4), JosŽ
Juan Castellano Reyes (1).
(1) Servicio de Estomatolog’a, Cirug’a Oral y Maxilofacial.
Hospital Universitario Insular de Gran Canaria. Espa–a.
(2) Servicio de Hematolog’a. Hospital Universitario Insular de
Gran Canaria.
(3) Unidad de Apoyo a la Investigaci—n. Hospital Universitario
Insular de Gran Canaria.
(4) Profesor asociado de la Facultad de Ciencias de la Salud de la
Universidad de Las Palmas de Gran Canaria.
RESUMEN
Hay una necesidad evidente de protocolizar los procedimien-
tos de cirug’a oral en pacientes sometidos a tratamiento anticoa-
gulante por v’a oral (TAO), tanto por la gravedad de las compli-
caciones como por la frecuencia creciente de la demanda, que
puede cuantificarse en algunos casos en el 8% de los pacientes
referidos desde atenci—n primaria al hospital para tratamiento qui-
rœrgico oral. En este estudio se definen los par‡metros para crear
un protocolo aplicable a este grupo de pacientes. Se concluye que
los pacientes enTAO no deben suspenderlo previamente a la ciru-
g’a oral si bien deber’a realizarse con control multidisciplinario,
especialmente si se trata de mayores de 65 a–os o con patolog’a
concomitante como insuficiencia renal o anemia o con otros tra-
tamientos mŽdicos.
Objetivo: Pretendemos demostrar que es posible la reali-
zaci—n de cirug’a oral en pacientes anticoagulados, sin nece-
sidad de retirar el tratamiento previamente.
Dise–o del estudio: Se realiz— un estudio longitudinal en
aquellos pacientes que precisaron algœn procedimiento qui-
rœrgico a nivel oral de los que estaban en TAO. Tras un con-
trol de INR se proced’a a la intervenci—n quirœrgica y pos-
teriormente se suministraba al paciente ‡cido tranex‡mico
para enjuagues bucales. La hemorragia postoperatoria se
catalog— leve cuando el sangrado fue inferior a 5 minutos,
moderado mayor de 5 minutos e intenso cuando se precis—
transfusi—n.
Resultados: Durante 5 a–os (1996-2000) se atendieron en
nuestro Servicio 125 pacientes con TAO, 90 hombres y 35
mujeres, a los que se les exodonciaron 367 piezas dentarias,
en 229 sesiones, con una media de 1,6 exodoncias por sesi—n.
Con respecto a la hemorragia postoperatoria, fue leve en 210
casos (91,7%), moderada en 18 (7,9%) y grave en un solo
caso (0,4%).
Se compararon todas las variables observ‡ndose que no
existieron diferencias estad’sticamente significativas.
Conclusiones: Consideramos que el TAO no debe suspen-
derse previamente a la cirug’a oral si bien deber’a realizarse
bajo control multidisciplinario, especialmente si se trata de
mayores de 65 a–os o con patolog’a concomitante como insu-
ficiencia renal o anemia o con otros tratamientos mŽdicos.
Palabras clave: cirug’a oral, anticoagulaci—n oral, ‡cido
tranex‡mico.
INTRODUCCIîN
Los anticoagulantes orales se utilizan en el tratamiento de
tromboembolismos venosos y en la prevenci—n de infartos y
embolismos sistŽmicos en pacientes con fibrilaci—n auricular,
enfermedad valvular card’aca o con pr—tesis valvulares met‡-
licas (1). Hoy en d’a, la warfarina s—dica es el anticoagulante
oral m‡s utilizado, pero requiere controles cuidadosos de
laboratorio, puesto que su actividad puede verse afectada por
varios factores, incluyendo la respuesta individual del pacien-
te, la dieta o la administraci—n simult‡nea de otros f‡rmacos.
Para la monitorizaci—n del tratamiento se utiliza el tiempo de
protrombina (TP), aunque desde 1983 la Organizaci—n
Mundial de la Salud recomienda el uso del INR
(International Normalized Ratio) como forma de estandarizar
el TP entre los diferentes laboratorios (2).
Cuando estos pacientes en tratamiento anticoagulante por
v’a oral (TAO) precisan ser sometidos a algœn procedimiento
de cirug’a oral existe un riesgo aumentado de sangrado de
forma que a lo largo del tiempo siempre ha existido la alter-
nativa entre disminuir e incluso suspender la dosis de anticoa-
gulante con el consiguiente riesgo de tromboembolismo o
mantener el tratamiento aœn a costa de aumentar el riesgo de
sangrado.
El objetivo del presente estudio es conseguir una nueva
pauta de actuaci—n en estos pacientes en funci—n de los datos
que tenemos desde que iniciamos el estudio en 1996, evitan-
do ingresos hospitalarios, tratamientos con heparina y demo-
ras innecesarias en la cirug’a oral.
MEDICINAORALVOL. 7 / N.o 1
ENE.-FEB. 2002
6363
Vicente M, Knezevic M, Tapia M, Viejo A, Orengo JC, García F, López O, Domínguez
S, Díaz JM, Castellano JJ. Cirugía oral en pacientes en tratamiento con
anticuagulantes orales. Pautas de actuación.
Medicina Oral 2002; 7: 63-70
© Medicina Oral. B-96689336
ISSN 1137-2834.
Recibido: 07/09/01. Aceptado: 29/09/01.
Received: 07/09/01. Accepted: 29/09/01.
MATERIAL Y MƒTODOS
Se realiz— un estudio longitudinal en el Hospital Insular
Universitario de Las Palmas de Gran Canaria (Espa–a), cola-
borando los departamentos de Estomatolog’a, Cirug’a Oral y
Maxilofacial, Hematolog’a y la Unidad de Apoyo a la
Investigaci—n, previa aprobaci—n por la Comisi—n de
Investigaci—n de dicho hospital y con el consentimiento infor-
mado de todos los pacientes.
Se incluyeron todos los pacientes que precisaban exodon-
cias dentarias, tanto convencionales como quirœrgicas de los
que estaban en TAO con acenocumarol (Sintrom¨
; Geigy)
controlados ambulatoriamente por el Servicio de
Hematolog’a. Estos pacientes eran remitidos a nuestro
Servicio para fijar la fecha de la intervenci—n ambulatoria. El
d’a indicado se hizo un control previo de INR para compro-
bar que se encontraba en el rango previsto en funci—n de su
patolog’a de base, y en caso contrario se difer’a su tratamien-
to. Seguidamente se proced’a a la intervenci—n quirœrgica. El
anestŽsico local utilizado fue lidocaina al 2% con epinefrina
1:100.000 (Octocaine¨
Clarben). Los mŽtodos hemost‡ticos
estaban marcados de antemano por el Servicio de
Hematolog’a, independientemente del nœmero de exodoncias
y si Žstas eran simples o complejas, consider‡ndose este œlti-
mo grupo cuando se precis— la realizaci—n de un colgajo y/u
osteotom’a. Con este proceder pretendimos no aplicar mayor
o menor grado de hemostasia en funci—n de la impresi—n del
cirujano oral. Las variantes de hemostasia practicadas fueron
la aplicaci—n de gasa hemost‡tica (Surgicel¨
Ethicon,
Johnson&Johnson) sola o con sutura, s—lo sutura o s—lo com-
presi—n local con ap—sito durante 20 minutos.
Tras las exodoncias se suministraba al paciente un agente
antifibrinol’tico sintŽtico, ‡cido tranex‡mico (Anchafibrin¨
Fides) para aplicar en principio con un ap—sito compresivo y
posteriormente mediante enjuagues bucales durante 2 minutos
cada 6 horas durante 2 d’as. La hemorragia postoperatoria se
catalog— leve cuando el sangrado fue inferior a 5 minutos, mode-
rado mayor de 5 minutos e intenso cuando se precis— transfusi—n.
En los casos en los que estaba indicada profilaxis de endo-
carditis se recomend— Amoxicilina (Clamoxyl¨
Smith-Kline
Beecham) 2 g v’a oral una hora antes de la intervenci—n qui-
rœrgica y 1 g 6 horas despuŽs de la misma. En caso de alergia
la pauta era con Eritromicina (Pantomicina¨
Abbot) 2 g una
hora antes de la intervenci—n y 1 g 6 horas despuŽs. En lo posi-
ble se evit— simultanear antibi—ticos durante m‡s tiempo para
eliminar interacciones medicamentosas ya que hay descritos
casos de hemorragias tard’as en pacientes a los que se les esta-
ba administrando al mismo tiempo TAO y amoxicilina (3).
Para realizar el an‡lisis estad’stico general se utilizo pro-
grama SPSS 10.0. Para las variables cualitativas se hall— la
frecuencia, relativa, absoluta y porcentaje; para las variables
cuantitativas se calcularon medidas de tendencia central,
como la medida de dispersi—n est‡ndar.
Para medir la asociaci—n existente entre dos variables cua-
litativas se realizo el test de Chi cuadrado con un nivel de
confianza de 95%. Para medir el grado de asociaci—n se busc—
el odds ratio. Para determinar la diferencia entre medidas de
las variables cuantitativas se realiz— el test T Student. El nivel
de confianza utilizado para los an‡lisis fue del 95%.
RESULTADOS
Durante 5 a–os (1996-2000) se atendieron en nuestro
Servicio 125 pacientes con TAO, 90 hombres y 35 mujeres, a
los que se les exodonciaron 367 piezas dentarias, en 229 sesio-
nes, con una media de 1,6 exodoncias por sesi—n, como se
detalla en la Tabla 1. La enfermedad de base que obligaba al
TAO queda reflejada en la Tabla 2. En la Tabla 3 se enumeran
las patolog’as asociadas en estos pacientes. Los tratamientos
concomitantes al TAO de estos pacientes, tambiŽn se contro-
laron en previsi—n de interferencias con la coagulaci—n, que-
dando reflejado en la Tabla 4. En 47 sesiones a 35 pacientes se
administr— profilaxis de endocarditis, siguiendo el protocolo
previamente establecido. Con respecto al INR preoperatorio,
en 145 ocasiones estaba entre 2 y 2,5 y en 84 entre 2,5 y 3.
Se consideraron complejas 19 de las 229 sesiones, 7 de
ellas por la utilizaci—n de colgajo y/o botador y 12 por la
osteotom’a realizada.
MEDICINAORALVOL. 7 / N.o 1
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6464
TABLA 1
Nœmero de exodoncias por sesi—n
N¼ de extracciones N¼ de sesiones % Total de %
por sesi—n extracciones
1 144 63 144 39,2
2 51 22,3 102 27,8
3 20 8,7 60 16,4
4 10 4,3 40 11
5 3 1,3 15 4
6 1 0,4 6 1,6
TOTAL 229 100 367 100
TABLA 2
Enfermedad de base
Enfermedad de base Pacientes
Fibrilaci—n auricular 57
Accidente cerebro-vascular 18
Valvulopat’as 17
Pr—tesis valvulares 10
Ateromatosis a—rtica 2
Infarto agudo de miocardio 2
Tromboembolismo pulmonar 15
Miocardiopat’a dilatada 4
TOTAL 125
Con respecto al tipo de hemostasia practicada lo resumi-
mos en la Tabla 5.
Con respecto a la hemorragia postoperatoria, fue leve en
210 casos (91,7%), moderada en 18 (7,9%) y grave en un solo
caso (0,4%).
Se compararon todas las variables, incluyendo el INR pre-
vio a la exodoncia, el nœmero de exodoncias en una misma
sesi—n, la existencia de traumatismo durante la extracci—n
dentaria, la instauraci—n de tratamiento antibi—tico profil‡cti-
co de endocarditis y el tipo de hemostasia realizada en rela-
ci—n al sangrado postoperatorio, observ‡ndose que no existen
diferencias estad’sticamente significativas.
DISCUSIîN
Los procedimientos de cirug’a oral en pacientes sometidos a
TAO han sido siempre muy controvertidos (4), sopes‡ndose por
un lado el riesgo de hemorragia frente a la aparici—n de fen—-
menos embol’genos en caso de suspender el mismo. Algunos
autores recomiendan no cambiar la pauta de TAO (5-8); mien-
tras que otros proponen la suspensi—n del TAO durante varios
d’as antes del procedimiento quirœrgico (9-13) o la sustituci—n
por heparina en los pacientes de alto riesgo (14,15).
Hay m‡s de 500 art’culos en los que se refiere la suspen-
si—n del TAO para diversos procedimientos dentales (16).
Aunque la gran mayor’a de estos pacientes no tuvieron nin-
guna complicaci—n, 4 de ellos murieron por complicaciones
emb—licas y uno m‡s sobrevivi— a dos procesos embol’genos.
Ciertamente se trata de un peque–o porcentaje (aproximada-
mente un 1%), pero las consecuencias son tan nefastas que
deber’an tenerse previamente en cuenta.
Por el contrario, de los 2.400 casos de procedimientos den-
tales documentados, realizados en 950 pacientes sin suspen-
der el TAO (16), s—lo hay descritas 12 complicaciones hemo-
rr‡gicas, que fueron tratadas de forma satisfactoria.
Sindet-Petersen et al. en 1989 (17) recomendaban inmedia-
tamente despuŽs de la exodoncia la aplicaci—n de una gasa
empapada en ‡cido tranex‡mico con compresi—n local duran-
te unos minutos y posteriormente enjuagues orales cada 6
horas durante 7 d’as, pauta que fue utilizada posteriormente
por otros (18-22). No obstante Souto et al. en 1996 (23) com-
pararon el tratamiento realizado en 92 pacientes a los que no
se les redujo la dosis de TAO, con respecto a los que se les sus-
titu’a por la administraci—n de heparina, sin que sobrevinieran
accidentes hemorr‡gicos, a pesar de reducir la dosis de enjua-
gues bucales de 7 a 2 d’as. Es por ello que en nuestro proto-
colo de actuaci—n la pauta fue igualmente de enjuagues buca-
les con ‡cido tranex‡mico durante 2 minutos cada 6 horas
durante s—lo 2 d’as. A diferencia de todos estos trabajos, en el
nuestro no utilizamos de forma rutinaria los tapones hemost‡-
ticos y sutura sino que de forma aleatoria se utilizaron estos
procedimientos e incluso se prescindi— de los mismos, sin que
encontr‡ramos mayor nœmero de complicaciones.
El ‡cido tranex‡mico es generalmente bien tolerado. Los
efectos adversos son poco frecuentes y si aparecen se cir-
cunscriben a n‡useas, diarrea y ocasionalmente hipotensi—n
de car‡cter ortost‡tico (24). En nuestro caso y dado que la
administraci—n fue puramente local, no se observ— ningœn
efecto indeseable.
En algœn art’culo tambiŽn se describe la cuantificaci—n
del sangrado en mililitros (6), pero nosotros dado que inten-
MEDICINAORALVOL. 7 / N.o 1
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6565
TABLA 3
Patolog’as asociadas
Patolog’a asociada Pacientes
Diabetes mellitus 3
Anemia ferropŽnica 1
Hipertensi—n arterial 7
Artrosis 1
Asma 1
Patolog’a oncol—gica 3
Cor pulmonale 8
Lupus eritematoso sistŽmico 1
Cardiopat’a isquŽmica 4
Hipoproteinemia 1
Ateromatosis a—rtica 2
TOTAL 32
TABLA 4
Tratamiento mŽdico concomitante
Tratamiento mŽdico concomitante Pacientes
Antihipertensivo 20
DiurŽticos 5
Digoxina 11
Vasodilatadores coronarios 1
AnalgŽsicos (no derivados de AAS) 1
Complejos vitam’nicos 1
Interfer—n 1
TOTAL 40
TABLA 5
Tipo de hemostasia
Tipo de hemostasia Pacientes
Gasa hemost‡tica 119
Gasa hemost‡tica + sutura 48
Sutura 2
Ap—sito compresivo 60
TOTAL 229
t‡bamos establecer un protocolo de aplicaci—n cl’nico nos
ce–imos simplemente a la objetivaci—n del tiempo de san-
grado visible.
Otros autores (25, 26) optan por no utilizar ‡cido tranex‡-
mico y en su lugar hacen hemostasia con esponjas de gelati-
na reabsorvible, sutura y sistema adhesivo de fibrina
(Tissucol¨
, Inmuno), con buenos resultados. No obstante,
œltimamente se ha desechado el uso de estos sistemas por el
riesgo de transmisi—n de enfermedades, as’ como por su ele-
vado coste y se opta por la obtenci—n de fibrina densa aut—lo-
ga (27-31). A travŽs del centrifugado de sangre aut—loga se
obtienen las diferentes fracciones de plasma que van a ser
activadas con cloruro c‡lcico dando lugar a un co‡gulo, a par-
tir del cual se formar‡ la fibrina densa aut—loga que servir‡ de
tap—n en el alvŽolo postextracci—n.
Con respecto al control previo del INR, seguimos las pautas de
Wahl et al. (4) comprobando en la mayor’a de los casos un valor
de 2-2,5 y de 2,5-3,0 en los pacientes con pr—tesis valvulares.
En nuestro estudio no hemos encontrado diferencia signi-
ficativa entre el sangrado postoperatorio y el tipo de hemos-
tasia practicada, coincidiendo con algœn estudio (32) en que
en la mayor’a de los casos es suficiente la aplicaci—n de
esponjas hemost‡ticas de gelatina y sutura.
CONCLUSIONES
Hay una necesidad evidente de protocolizar los procedi-
mientos de cirug’a oral en pacientes sometidos a TAO, tanto
por la gravedad de las complicaciones como por la frecuen-
cia creciente de la demanda, que puede cuantificarse en
algunos casos en el 8% de los pacientes referidos desde
atenci—n primaria al hospital para tratamiento quirœrgico
oral (33). Consideramos que los pacientes en TAO no deben
suspenderlo previamente a la cirug’a oral si bien deber’a
realizarse con control multidisciplinario (34), especialmen-
te si se trata de mayores de 65 a–os o con patolog’a conco-
mitante como insuficiencia renal o anemia o con otros trata-
mientos mŽdicos.
MEDICINAORALVOL. 7 / N.o 1
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6666
MEDICINAORALVOL. 7 / N.o 1
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Oralsurgeryinthepatients
undergoingoral
anticoagulanttherapy
SUMMARY
There is an evident need for procedural protocol for oral
surgery patients who undergo oral anticoagulant treatment
(OAT) because of: 1) the possible severity of complications
and 2) the growing demand for OAT, which in some cases
may be as much as 8% of the oral surgery patients that are
referred to the hospital from primary care centers. In this
study, the authors define the parameters for creating a proto-
col applicable to this group of patients. The conclusion is that
it is not necessary to suspend OAT before surgery; rather,
these procedures should be performed under multidiscipli-
nary medical control.
Objective: The authors demonstrate that it is possible to
perform oral surgery on OAT patients, without having to sus-
pend treatment beforehand.
Study design: A longitudinal study was performed in OAT
patients that required some type of oral surgical procedures.
After an INR control, the patient underwent surgery and after-
wards the patient was given tranexamic acid as a mouth rinse.
Postoperative hemorrhage was classified as slight when it las-
ted less than 5 minutes, moderate when it lasted longer than five
minutes, and severe when it required blood transfusion.
Results: The study was performed over a 5-year period
(1996-2000), by the maxillofacial surgery department. In that
time period, 125 patients with OAT were treated; 90 of them
were males and 35 were females. Tooth extraction was per-
formed in 229 sessions and a total of 367 teeth were extrac-
ted, with an average of 1.6% per session. With regards to pos-
toperative hemorrahage, it was slight in 210 cases (91.7%),
moderate in 18 (7.9%) and severe only in one case (0.4%).
All the variables were compared and no statistically signifi-
cant differences were found.
Conclusions: We believe that OAT should not be suspen-
ded before oral surgery, but it surgery should be performed
under multidisciplinary controlÑespecially in the case of the
elderly (over 65) or with those patients that have other con-
comitant illnesses such as renal insufficiency or anemia or
other medical treatments.
Key words: oral surgery, oral anticoagulant treatment,
tranexamic acid.
INTRODUCTION
Oral anticoagulants are used to treat venous thromboembo-
lisms, as well as for the prevention of systemic infarcts and sys-
temic embolisms in patients with auricular fibrillation, cardiac
valve disease, or in patients with metallic valve prosthesis (1).
Nowadays, the most common oral anticoagulant agent is warp-
harine sodium, although its use requires close laboratory analy-
sis control since its effectiveness can be altered by various fac-
tors, including the individual reaction of the patient, the
patientÕs diet, as well as by the simultaneous administration of
other medicines. As a main monitoring tool, the prothrombine
time (PT) is used, although since 1983 the WHO recommends
the use of the International Normalized Ratio (INR) as a means
of standardizing the PT among different laboratories (2).
There is substantial risk of haemorrhage when OAT
patients need to undergo some type of oral surgery procedu-
re. Historically we have always had the options of either sus-
pending the anticoagulant dosis, with the consequential risk
of thromboembolism, or to continue treatment under increa-
sed risk of postoperative bleeding. In this article we present
out experience in treating these patients. The study was ela-
borated during a 5-year period, beginning in 1996.
MATERIAL AND METHODS
This study was elaborated and performed in the
Departments of Stomatology, Oral and Maxillofacial Surgery
and Haematology as well as in the Research Unit of the
Insular University Hospital of Las Palmas, Canary Islands,
Spain, previously approved by the Research Commission of
the same hospital and with consent from all patients included.
We included all patients which needed to undergo oral sur-
gical procedures and who were also in OAT with acenocuma-
rol (Sintrom¨; Geigy) and were previously controlled in the
Haematology Department. These patients were sent to the
Department of Stomatology, Oral and Maxillofacial Surgery
to set a date for ambulatory intervention. On the indicated
day, the INR was measured to assure that the results were wit-
hin range, according to the basic pathology of the patient. If it
was, the surgical intervention was performed immediately.
Local anaesthesia of 2% Lidocaine with epinephrine
(Octocain¨; Clarben) was used. The local haemostasis met-
hods were initially defined by the Haematology Department,
regardless of the number of teeth to be extracted and the pos-
sible complexity of the intervention. Both the osteotomy and
leverage during surgical procedure were considered as com-
plex extraction. By doing so, we avoided using a lower level of
haemostasis that was dependent soley on the surgeonÕs
impressions. The various methods of haemostasia applied
were as: compressive haemostatic gauze (Surgicel¨ Ethicon,
Johnson&Johnson) alone or with suture, suture alone or local
compression with devices, during 20 minutes after surgery.
After surgery, the patients received a synthetic antifibri-
nolytic agent, tranexamic acid (Anchafibrin¨ Fides), first as
local compression and afterwards as a mouth rinse, for 2
minutes every 6 hours during two days. The post-surgical
haemorrhage was classified as low when it lasted less than 5
minutes after surgery, moderate when it lasted over 5 minu-
tes, and severe when it required a transfusion.
MEDICINAORALVOL. 7 / N.o 1
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6868
In the cases where antibiotic prophylaxis due to endocarditis
was needed, usually Amoxicillin (Clamoxyl¨ Smith-Kline
Beecham) was recommended, and given in doses of 2 g orally
one hour before the intervention and 1 g six hours after the inter-
vention. When the allergy to penicillin was reported, erythromy-
cin (Pantomicine¨ Abbot) was administered, 2 g before inter-
vention and 1 g six hours after surgery. When it was possible,
antibiotic treatment was not applied for longer periods of time,
to avoid adverse interactions and possible delayed haemorrha-
ge. There have been reports of delayed haemorrhage in patients
who were given OAT and amoxicilin at the same time (3).
The statistical package SPSS 10.0 was used for data analy-
sis. For the qualitative values, relative, absolute and percenta-
ge frequency were determined; for the quantitative values, the
central tendency and the standard dispersion were measured.
For measurement of the existing association between the two
qualitative variables, the Chi2 test was performed with a con-
fidence level of 95%. To measure the degree of association the
Odds Ratio was employed. To determine the difference betwe-
en the quantitative variables, the T-Student test was used. The
confidence level used in analysis was of 95%.
RESULTS
During a 5-year period (1996-2000), 125 patients with
OAT were seen by the Maxillofacial Surgery Department of
the Insular University Hospital in Las Palmas, Canary
Islands. Of these, 90 were males and 35 were females. A total
of 367 teeth were extracted in 229 sessions, with an average
of 1.6 teeth extracted per patient (Table 1). The basic disea-
ses that required OAT are reflected in Table 2. Table 3 enu-
merates the associated pathologies in these patients. The con-
comitant treatments to OAT that these patients had was also
controlled, to avoid interferences with the coagulation; this is
shown in Table 4. In 35 patients during 47 sessions, the endo-
carditis prophylaxis was administered, following the pre-
viously established protocol. Regarding INR before surgery, it
was between 2 and 2.5 in 145 cases and in another 84 situa-
tions it was between 2.5 and 3. Nineteen of the sessions were
considered complex surgery, 7 of them due to root leverage
use and 12 because of osteotomy.
The type of haemostasis used in these procedures is sum-
marized in Table 5.
The postoperative hemorrhage was slight in 210 of the
cases (91.7%), moderate in 18 (7.9%), and severe only in one
case (0.4%).
All variables were compared and analysed, including pre-
operative INR, the number of teeth extracted in one session,
the existence of trauma during teeth extraction, the adminis-
tration of endocarditis prophylactic treatment, as well as the
type of post surgical haemostasis. No statistically significant
differences or relationships were found.
DISCUSSION
The oral surgery procedures in OAT patients has always been
very controversial due to the dilemma between the high risk of
hemorrhage versus the possibility of embolism should the OAT be
suspended (4). Some authors recommend not changing the OAT
treatment (5-8), while others propose the suspension of OAT alto-
gether for several days before the surgical intervention (9-13), or
substitution with heparin in patients with high risk level (14, 15).
In the current literature there are more than 500 articles
advocating the suspension of OAT for oral or dental surgical
interventions (16). Although the majority of these patients did
not have any complications, four of them died due to embolism
complications and another suffered two episodes of embolism.
Certainly, this percentage is very low (approximately 1%), but
such grave sequels as consequence of tooth extraction obliges
that attention be rightly paid. On another front, of the 2400
cases of dental surgery reported and performed in 950 patients
without OAT suspension, there were only 12 hemorrhage com-
plications described, and treated favorably (16).
Sindet-Pedersen et al. in 1989 in their study (17), recom-
mended the use of gauze soaked in tranexamic acid immedia-
tely after tooth extraction, combined with local pressure for a
few minutes and the us of oral rinse devices during one
TABLE 1
Number of teeth extracted per session
N¼ extractions N¼ % Total %
per session of sessions Extractions
1 144 63 144 39.2
2 51 22.3 102 27.8
3 20 8.7 60 16.4
4 10 4.3 40 11
5 3 1.3 15 4
6 1 0.4 6 1.6
TOTAL 229 100 367 100
TABLE 2
Basic diseases
Basic disease Patients
Auricular fibrillation 57
Cerebro vascular Insult 18
Pathology of the valves 17
Prosthesis of the valves 10
Aortic atheromatosis 2
Acute myocardial infarct 2
Lung thromboembolism 15
Dilatation myocardiopathy 4
TOTAL 125
MEDICINAORALVOL. 7 / N.o 1
ENE.-FEB. 2002
6969
weekÑa method used also by others (18-22). Nevertheless,
Souto et al. in 1996 (23), compared the treatment performed
on 92 patients in which the OAT was not reduced, with the
ones where it was substituted for heparin, and reported no
hemorrhage complications in spite of reducing mouth rinsing
form 7 to 2 days. Regarding of this, in our protocol the pos-
ture was to apply mouth rinse with tranexamic acid two minu-
tes every sic hours during two days. In difference with these
findings, we did not use gauze and suture over the wounds
routinely; rather, these were used randomly if at all, without
ever observing any increase of complications.
Tranexamic acid is generally well tolerated by patients.
Adverse effects are rare and if they do occur, are generally
manifested as nausea, diarrhea and occasionally as orthosta-
tic arterial hypotension (24). In our study, tranexamic acid
was used only locally, so we did not have any complaint on it,
nor have we seen any complications associated with it.
In some publications the quantitative measurement is
noted in millimeters of hemorrhage (6). Our objective was
not to measure bleeding, but merely to measure the time of
visible post-operative hemorrhage.
Other authors (25, 26) do not use tranexamic acid; instead
they perform haemostasis with gelatine resolvable sponges, sutu-
re and fibrin adhesives (Tissucol ¨; Immuno), with good results,
albeit more expensive ones. Nevertheless, these systems of hae-
mostasis have recently been suspended due to risk of transmitting
certain diseases, as well as due to its elevated cost. The preferred
alternative has been the use of dense autologous fibrin obtained
through centrifuging the autologous blood (27-31)
With respect to preoperational INR we follow Wahl et al.
(4), observing in most cases a value between 2-3 and values
between 2.5-3.0 in patients with prosthetic heart valves.
We have not found any significant differences between post
surgical bleeding and the system of haemostasis used in each
patient. We agree with other authors (32) that in most cases
the application of gelatine resolvable sponges and suture is
sufficient for our purposes.
CONCLUSIONS
Certainly there is an evident need to make a protocol for
oral surgery procedures in the patients with OAT, as well as
for serious complications of these. This need is aggravated by
the increased demand: 8% of all patients that are referred to
hospitals from outpatient facilities (33). We believe that oral
treatment prior to surgery should not be suspended, as long
as treatment is administrated in specialised facilities which
provide a multidisciplinary approach for a patientÕs control
(34), particularly for the patients over 65 years and/or with
concomitant pathology e.g. kidney disease, anaemia or pro-
longed medical treatment.
TABLE 3
Associated pathologies
Associated pathology Patients
Diabetes Mellitus 3
Pernicious Anemia 1
Arterial hypertension 7
Arthrosis 1
Asthma 1
Neoplastic pathology 3
Cor pulmonale 8
Systemic eritematous lupus 1
Ischemic heart disease 4
Hypoproteinemia 1
Aortic atheromatosis 2
TOTAL 32
TABLE 4
Associated medical treatment
Associated medical treatment Patients
Antihypertensive 20
Diuretics 5
Digoxina 11
Coronary vasodilatators 1
Analgesics no deriving from AAS 1
Vitamin complexes 1
Interferon 1
TOTAL 40
TABLE 5
Type of haemostasis
Type of haemostasis Patients
Haemostatic gauze 119
Haemostatic gauze + Suture 48
Suture 2
Compressive devices 60
TOTAL 229
CORRESPONDENCIA/CORRESPONDENCE
Mario Vicente Barrero
C/ Garc’a Morato 30
35011-Las Palmas de Gran Canaria
Tfno.: 928-257791. Fax: 928-602951.
E-mail: mvicente@idecnet.com
MEDICINAORALVOL. 7 / N.o 1
ENE.-FEB. 2002
7070
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Oral Anticoagulant: A Survey of Practices in North America. J Oral
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going dental treatment. JADA 1977; 94: 1158-62.
9. Patton LL, Ship JA. Treatment of patients with bleeding disorders. Dent
Clin North Am 1994; 38: 465-82.
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procedures. Oral Surg Oral Med Oral Pathol 1975; 40: 448-57.
11. Robert HJ. Anticoagulants during dental surgery. Lancet 1966; 17: 639.
12. Speechley JA, Rugman FP. Some problems with anticoagulants in den-
tal surgery. Dent Update 1992; 19: 204-6.
13. Russo G, Corso LD, Biasiolo A, Berengo M, Pengo V. Simple and safe
method to prepare patients with prosthetic heart valves for surgical den-
tal procedures. Clin Appl Thromb Hemost 2000; 6: 90-3.
14. Merha P, Cottrell DA, Bestgen SC, Booth DF. Management of Heparin
Therapy in the High-Risk, Chronically Anticoagulated, Oral Surgery
Patient: A Review and a Proposed Nomogram. J Oral Maxillofac Surg
2000; 58: 198-202.
15. Roudant R, Lorient-Roudant MF. Traitement antithrombotique chez le
porteur de prothŽse valvulaire mŽcanique. Arch Mal CÏur 1996; 89:
1543-50.
16. Wahl, MJ. Myths of dental surgery in patients receiving anticoagulant
therapy JADA 2000; 131: 77-81.
17. Sindet-Pedersen S, Ramstršm G, Bernvil S, BlombŠck M. Hemostatic
effect of tranexamic acid mouthwash in anticoagulant-treated patients
undergoing oral surgery. N Engl J Med 1989; 320: 840-3.
18. Street AM, Leung W. Use of tranexamic acid mouthwash in dental pro-
cedures in patients takings oral anticoagulants. Letter. Med J Aust 1990;
153: 630.
19. Ramstršm G, Sindet-Petersen S, Hall G, BlombŠck M, Alander U.
Prevention of Postsurgical Bleeding in Oral Surgery Using Tranexamic
Acid Without Dose Modification of Oral Anticoagulants. J Oral
Maxillofac Surg 1993; 51: 1211-6.
20. Borea G, Montebugnoli L, Capuzzi P, Magelli C. Tranexamic acid as a
mouthwash in anticoagulant-treated patients undergoing oral surgery. An
alternative method to discontinuing anticoagulant therapy. Oral Surg
Oral Med Oral Pathol 1993; 75: 29-31.
21. Mart’nez-Sanz JM, Bresc—-Salinas M, Berini-AytŽs L, Gay-Escoda C.
Cirug’a bucal y anticoagulantes orales: una propuesta de actuaci—n.
RCOE 1998; 3: 555-62.
22. Webster K, Wilde J. Management of anticoagulation in patients with
prosthetic heart valves undergoing oral and maxillofacial operations. Br
J Oral Maxillofac Surg 2000; 38: 124-6.
23. Souto JC, Oliver A, Zuazu-Jausoro I, Vives A, Fontcuberta J. Oral
Surgery in Anticoagulated Patients Without Reducing the Dose of Oral
Anticoagulant: A Prospective Randomized Study. J Oral Maxillofac
Surg 1996; 54: 27-32.
24. Dunn CJ, Goa KL. Tranexamic Acid: A Review of its Use in Surgery and
Other Indications. Drugs 1999; 57: 1005-32.
25. Bodner L, Weinstein JM, Kleiner A. Efficacy of fibrin sealant in patients
on various levels of oral anticoagulant undergoing oral surgery. Oral
Surg Oral Med Oral Pathol Oral Radiol Endod 1998; 86: 421-4.
26. Carmona Arroyo FG, Monleon Alegre V. La exodoncia en el paciente de
alto riesgo hemorr‡gico. Editado por Instituto de hemoderivados
Inmuno S.A. 1994.
27. Antonaides HN, Williams LT. Human platelet-derived growth factor:
Structure and functions. Federation Proc 1983; 42: 2630-4.
28. Bowen-Pope DF, Vogel A, Ross R. Production of platelet-derived
growth factor-like molecules and reduced expression of platelet-derived
growth factors receptors accompany transformation by a wide spectrum
of agents. Proc Natl Acad Sci USA 1984; 81: 2396-400.
29. Roberts AB, Sprom MB. Physiological actions and clinical applications
of transforming growth factor-beta (TGF-beta) Growth Factors 1993; 8:
1-9.
30. Serrano Cuenca V. Growth Factors: A new therapeutical approach?
Periodoncia 1997; 7: 99-115.
31. Robert CM. Platelet rich plasma. J Oral Maxillofac Surg 1998; 85: 6.
32. Blinder D, Manor Y, Martinowitz U, Taicher S, Hashomer. T Dental
extractions in patients maintained on continued oral anticoagulant: com-
parison of local hemostatic modalities. Oral Surg Oral Med Oral Pathol
Oral Radiol Endod 1999; 88:137-40.
33. Absi EG, Satterthwaite J, Sheperd JP, Thomas DW. The appropriateness
of referral of medically compromised dental patients to hospital. Br Oral
Maxillofac Surg. 1997; 35: 133-6.
34. Hirsh J. Oral anticoagulant drugs. N Engl J Med 1991; 324: 1865-75.
BIBLIOGRAFêA/REFERENCES

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Cirugia en enticuagualdos

  • 1. Cirug’aoralenpacientesen tratamientoconanticoagulantes orales.Pautadeactuaci—n AUTORES/AUTHORS Mario Vicente Barrero (1)(4), Milan Knezevic (1), Manuel Tapia Mart’n (2), Aurora Viejo Llorente (2), Juan Carlos Orengo Valverde (3)(4), Francisco Garc’a JimŽnez (1), Omar L—pez PŽrez (1), Sergio Dom’nguez Sarmiento (1), JosŽ Manuel D’az Cremades (2)(4), JosŽ Juan Castellano Reyes (1). (1) Servicio de Estomatolog’a, Cirug’a Oral y Maxilofacial. Hospital Universitario Insular de Gran Canaria. Espa–a. (2) Servicio de Hematolog’a. Hospital Universitario Insular de Gran Canaria. (3) Unidad de Apoyo a la Investigaci—n. Hospital Universitario Insular de Gran Canaria. (4) Profesor asociado de la Facultad de Ciencias de la Salud de la Universidad de Las Palmas de Gran Canaria. RESUMEN Hay una necesidad evidente de protocolizar los procedimien- tos de cirug’a oral en pacientes sometidos a tratamiento anticoa- gulante por v’a oral (TAO), tanto por la gravedad de las compli- caciones como por la frecuencia creciente de la demanda, que puede cuantificarse en algunos casos en el 8% de los pacientes referidos desde atenci—n primaria al hospital para tratamiento qui- rœrgico oral. En este estudio se definen los par‡metros para crear un protocolo aplicable a este grupo de pacientes. Se concluye que los pacientes enTAO no deben suspenderlo previamente a la ciru- g’a oral si bien deber’a realizarse con control multidisciplinario, especialmente si se trata de mayores de 65 a–os o con patolog’a concomitante como insuficiencia renal o anemia o con otros tra- tamientos mŽdicos. Objetivo: Pretendemos demostrar que es posible la reali- zaci—n de cirug’a oral en pacientes anticoagulados, sin nece- sidad de retirar el tratamiento previamente. Dise–o del estudio: Se realiz— un estudio longitudinal en aquellos pacientes que precisaron algœn procedimiento qui- rœrgico a nivel oral de los que estaban en TAO. Tras un con- trol de INR se proced’a a la intervenci—n quirœrgica y pos- teriormente se suministraba al paciente ‡cido tranex‡mico para enjuagues bucales. La hemorragia postoperatoria se catalog— leve cuando el sangrado fue inferior a 5 minutos, moderado mayor de 5 minutos e intenso cuando se precis— transfusi—n. Resultados: Durante 5 a–os (1996-2000) se atendieron en nuestro Servicio 125 pacientes con TAO, 90 hombres y 35 mujeres, a los que se les exodonciaron 367 piezas dentarias, en 229 sesiones, con una media de 1,6 exodoncias por sesi—n. Con respecto a la hemorragia postoperatoria, fue leve en 210 casos (91,7%), moderada en 18 (7,9%) y grave en un solo caso (0,4%). Se compararon todas las variables observ‡ndose que no existieron diferencias estad’sticamente significativas. Conclusiones: Consideramos que el TAO no debe suspen- derse previamente a la cirug’a oral si bien deber’a realizarse bajo control multidisciplinario, especialmente si se trata de mayores de 65 a–os o con patolog’a concomitante como insu- ficiencia renal o anemia o con otros tratamientos mŽdicos. Palabras clave: cirug’a oral, anticoagulaci—n oral, ‡cido tranex‡mico. INTRODUCCIîN Los anticoagulantes orales se utilizan en el tratamiento de tromboembolismos venosos y en la prevenci—n de infartos y embolismos sistŽmicos en pacientes con fibrilaci—n auricular, enfermedad valvular card’aca o con pr—tesis valvulares met‡- licas (1). Hoy en d’a, la warfarina s—dica es el anticoagulante oral m‡s utilizado, pero requiere controles cuidadosos de laboratorio, puesto que su actividad puede verse afectada por varios factores, incluyendo la respuesta individual del pacien- te, la dieta o la administraci—n simult‡nea de otros f‡rmacos. Para la monitorizaci—n del tratamiento se utiliza el tiempo de protrombina (TP), aunque desde 1983 la Organizaci—n Mundial de la Salud recomienda el uso del INR (International Normalized Ratio) como forma de estandarizar el TP entre los diferentes laboratorios (2). Cuando estos pacientes en tratamiento anticoagulante por v’a oral (TAO) precisan ser sometidos a algœn procedimiento de cirug’a oral existe un riesgo aumentado de sangrado de forma que a lo largo del tiempo siempre ha existido la alter- nativa entre disminuir e incluso suspender la dosis de anticoa- gulante con el consiguiente riesgo de tromboembolismo o mantener el tratamiento aœn a costa de aumentar el riesgo de sangrado. El objetivo del presente estudio es conseguir una nueva pauta de actuaci—n en estos pacientes en funci—n de los datos que tenemos desde que iniciamos el estudio en 1996, evitan- do ingresos hospitalarios, tratamientos con heparina y demo- ras innecesarias en la cirug’a oral. MEDICINAORALVOL. 7 / N.o 1 ENE.-FEB. 2002 6363 Vicente M, Knezevic M, Tapia M, Viejo A, Orengo JC, García F, López O, Domínguez S, Díaz JM, Castellano JJ. Cirugía oral en pacientes en tratamiento con anticuagulantes orales. Pautas de actuación. Medicina Oral 2002; 7: 63-70 © Medicina Oral. B-96689336 ISSN 1137-2834. Recibido: 07/09/01. Aceptado: 29/09/01. Received: 07/09/01. Accepted: 29/09/01.
  • 2. MATERIAL Y MƒTODOS Se realiz— un estudio longitudinal en el Hospital Insular Universitario de Las Palmas de Gran Canaria (Espa–a), cola- borando los departamentos de Estomatolog’a, Cirug’a Oral y Maxilofacial, Hematolog’a y la Unidad de Apoyo a la Investigaci—n, previa aprobaci—n por la Comisi—n de Investigaci—n de dicho hospital y con el consentimiento infor- mado de todos los pacientes. Se incluyeron todos los pacientes que precisaban exodon- cias dentarias, tanto convencionales como quirœrgicas de los que estaban en TAO con acenocumarol (Sintrom¨ ; Geigy) controlados ambulatoriamente por el Servicio de Hematolog’a. Estos pacientes eran remitidos a nuestro Servicio para fijar la fecha de la intervenci—n ambulatoria. El d’a indicado se hizo un control previo de INR para compro- bar que se encontraba en el rango previsto en funci—n de su patolog’a de base, y en caso contrario se difer’a su tratamien- to. Seguidamente se proced’a a la intervenci—n quirœrgica. El anestŽsico local utilizado fue lidocaina al 2% con epinefrina 1:100.000 (Octocaine¨ Clarben). Los mŽtodos hemost‡ticos estaban marcados de antemano por el Servicio de Hematolog’a, independientemente del nœmero de exodoncias y si Žstas eran simples o complejas, consider‡ndose este œlti- mo grupo cuando se precis— la realizaci—n de un colgajo y/u osteotom’a. Con este proceder pretendimos no aplicar mayor o menor grado de hemostasia en funci—n de la impresi—n del cirujano oral. Las variantes de hemostasia practicadas fueron la aplicaci—n de gasa hemost‡tica (Surgicel¨ Ethicon, Johnson&Johnson) sola o con sutura, s—lo sutura o s—lo com- presi—n local con ap—sito durante 20 minutos. Tras las exodoncias se suministraba al paciente un agente antifibrinol’tico sintŽtico, ‡cido tranex‡mico (Anchafibrin¨ Fides) para aplicar en principio con un ap—sito compresivo y posteriormente mediante enjuagues bucales durante 2 minutos cada 6 horas durante 2 d’as. La hemorragia postoperatoria se catalog— leve cuando el sangrado fue inferior a 5 minutos, mode- rado mayor de 5 minutos e intenso cuando se precis— transfusi—n. En los casos en los que estaba indicada profilaxis de endo- carditis se recomend— Amoxicilina (Clamoxyl¨ Smith-Kline Beecham) 2 g v’a oral una hora antes de la intervenci—n qui- rœrgica y 1 g 6 horas despuŽs de la misma. En caso de alergia la pauta era con Eritromicina (Pantomicina¨ Abbot) 2 g una hora antes de la intervenci—n y 1 g 6 horas despuŽs. En lo posi- ble se evit— simultanear antibi—ticos durante m‡s tiempo para eliminar interacciones medicamentosas ya que hay descritos casos de hemorragias tard’as en pacientes a los que se les esta- ba administrando al mismo tiempo TAO y amoxicilina (3). Para realizar el an‡lisis estad’stico general se utilizo pro- grama SPSS 10.0. Para las variables cualitativas se hall— la frecuencia, relativa, absoluta y porcentaje; para las variables cuantitativas se calcularon medidas de tendencia central, como la medida de dispersi—n est‡ndar. Para medir la asociaci—n existente entre dos variables cua- litativas se realizo el test de Chi cuadrado con un nivel de confianza de 95%. Para medir el grado de asociaci—n se busc— el odds ratio. Para determinar la diferencia entre medidas de las variables cuantitativas se realiz— el test T Student. El nivel de confianza utilizado para los an‡lisis fue del 95%. RESULTADOS Durante 5 a–os (1996-2000) se atendieron en nuestro Servicio 125 pacientes con TAO, 90 hombres y 35 mujeres, a los que se les exodonciaron 367 piezas dentarias, en 229 sesio- nes, con una media de 1,6 exodoncias por sesi—n, como se detalla en la Tabla 1. La enfermedad de base que obligaba al TAO queda reflejada en la Tabla 2. En la Tabla 3 se enumeran las patolog’as asociadas en estos pacientes. Los tratamientos concomitantes al TAO de estos pacientes, tambiŽn se contro- laron en previsi—n de interferencias con la coagulaci—n, que- dando reflejado en la Tabla 4. En 47 sesiones a 35 pacientes se administr— profilaxis de endocarditis, siguiendo el protocolo previamente establecido. Con respecto al INR preoperatorio, en 145 ocasiones estaba entre 2 y 2,5 y en 84 entre 2,5 y 3. Se consideraron complejas 19 de las 229 sesiones, 7 de ellas por la utilizaci—n de colgajo y/o botador y 12 por la osteotom’a realizada. MEDICINAORALVOL. 7 / N.o 1 ENE.-FEB. 2002 6464 TABLA 1 Nœmero de exodoncias por sesi—n N¼ de extracciones N¼ de sesiones % Total de % por sesi—n extracciones 1 144 63 144 39,2 2 51 22,3 102 27,8 3 20 8,7 60 16,4 4 10 4,3 40 11 5 3 1,3 15 4 6 1 0,4 6 1,6 TOTAL 229 100 367 100 TABLA 2 Enfermedad de base Enfermedad de base Pacientes Fibrilaci—n auricular 57 Accidente cerebro-vascular 18 Valvulopat’as 17 Pr—tesis valvulares 10 Ateromatosis a—rtica 2 Infarto agudo de miocardio 2 Tromboembolismo pulmonar 15 Miocardiopat’a dilatada 4 TOTAL 125
  • 3. Con respecto al tipo de hemostasia practicada lo resumi- mos en la Tabla 5. Con respecto a la hemorragia postoperatoria, fue leve en 210 casos (91,7%), moderada en 18 (7,9%) y grave en un solo caso (0,4%). Se compararon todas las variables, incluyendo el INR pre- vio a la exodoncia, el nœmero de exodoncias en una misma sesi—n, la existencia de traumatismo durante la extracci—n dentaria, la instauraci—n de tratamiento antibi—tico profil‡cti- co de endocarditis y el tipo de hemostasia realizada en rela- ci—n al sangrado postoperatorio, observ‡ndose que no existen diferencias estad’sticamente significativas. DISCUSIîN Los procedimientos de cirug’a oral en pacientes sometidos a TAO han sido siempre muy controvertidos (4), sopes‡ndose por un lado el riesgo de hemorragia frente a la aparici—n de fen—- menos embol’genos en caso de suspender el mismo. Algunos autores recomiendan no cambiar la pauta de TAO (5-8); mien- tras que otros proponen la suspensi—n del TAO durante varios d’as antes del procedimiento quirœrgico (9-13) o la sustituci—n por heparina en los pacientes de alto riesgo (14,15). Hay m‡s de 500 art’culos en los que se refiere la suspen- si—n del TAO para diversos procedimientos dentales (16). Aunque la gran mayor’a de estos pacientes no tuvieron nin- guna complicaci—n, 4 de ellos murieron por complicaciones emb—licas y uno m‡s sobrevivi— a dos procesos embol’genos. Ciertamente se trata de un peque–o porcentaje (aproximada- mente un 1%), pero las consecuencias son tan nefastas que deber’an tenerse previamente en cuenta. Por el contrario, de los 2.400 casos de procedimientos den- tales documentados, realizados en 950 pacientes sin suspen- der el TAO (16), s—lo hay descritas 12 complicaciones hemo- rr‡gicas, que fueron tratadas de forma satisfactoria. Sindet-Petersen et al. en 1989 (17) recomendaban inmedia- tamente despuŽs de la exodoncia la aplicaci—n de una gasa empapada en ‡cido tranex‡mico con compresi—n local duran- te unos minutos y posteriormente enjuagues orales cada 6 horas durante 7 d’as, pauta que fue utilizada posteriormente por otros (18-22). No obstante Souto et al. en 1996 (23) com- pararon el tratamiento realizado en 92 pacientes a los que no se les redujo la dosis de TAO, con respecto a los que se les sus- titu’a por la administraci—n de heparina, sin que sobrevinieran accidentes hemorr‡gicos, a pesar de reducir la dosis de enjua- gues bucales de 7 a 2 d’as. Es por ello que en nuestro proto- colo de actuaci—n la pauta fue igualmente de enjuagues buca- les con ‡cido tranex‡mico durante 2 minutos cada 6 horas durante s—lo 2 d’as. A diferencia de todos estos trabajos, en el nuestro no utilizamos de forma rutinaria los tapones hemost‡- ticos y sutura sino que de forma aleatoria se utilizaron estos procedimientos e incluso se prescindi— de los mismos, sin que encontr‡ramos mayor nœmero de complicaciones. El ‡cido tranex‡mico es generalmente bien tolerado. Los efectos adversos son poco frecuentes y si aparecen se cir- cunscriben a n‡useas, diarrea y ocasionalmente hipotensi—n de car‡cter ortost‡tico (24). En nuestro caso y dado que la administraci—n fue puramente local, no se observ— ningœn efecto indeseable. En algœn art’culo tambiŽn se describe la cuantificaci—n del sangrado en mililitros (6), pero nosotros dado que inten- MEDICINAORALVOL. 7 / N.o 1 ENE.-FEB. 2002 6565 TABLA 3 Patolog’as asociadas Patolog’a asociada Pacientes Diabetes mellitus 3 Anemia ferropŽnica 1 Hipertensi—n arterial 7 Artrosis 1 Asma 1 Patolog’a oncol—gica 3 Cor pulmonale 8 Lupus eritematoso sistŽmico 1 Cardiopat’a isquŽmica 4 Hipoproteinemia 1 Ateromatosis a—rtica 2 TOTAL 32 TABLA 4 Tratamiento mŽdico concomitante Tratamiento mŽdico concomitante Pacientes Antihipertensivo 20 DiurŽticos 5 Digoxina 11 Vasodilatadores coronarios 1 AnalgŽsicos (no derivados de AAS) 1 Complejos vitam’nicos 1 Interfer—n 1 TOTAL 40 TABLA 5 Tipo de hemostasia Tipo de hemostasia Pacientes Gasa hemost‡tica 119 Gasa hemost‡tica + sutura 48 Sutura 2 Ap—sito compresivo 60 TOTAL 229
  • 4. t‡bamos establecer un protocolo de aplicaci—n cl’nico nos ce–imos simplemente a la objetivaci—n del tiempo de san- grado visible. Otros autores (25, 26) optan por no utilizar ‡cido tranex‡- mico y en su lugar hacen hemostasia con esponjas de gelati- na reabsorvible, sutura y sistema adhesivo de fibrina (Tissucol¨ , Inmuno), con buenos resultados. No obstante, œltimamente se ha desechado el uso de estos sistemas por el riesgo de transmisi—n de enfermedades, as’ como por su ele- vado coste y se opta por la obtenci—n de fibrina densa aut—lo- ga (27-31). A travŽs del centrifugado de sangre aut—loga se obtienen las diferentes fracciones de plasma que van a ser activadas con cloruro c‡lcico dando lugar a un co‡gulo, a par- tir del cual se formar‡ la fibrina densa aut—loga que servir‡ de tap—n en el alvŽolo postextracci—n. Con respecto al control previo del INR, seguimos las pautas de Wahl et al. (4) comprobando en la mayor’a de los casos un valor de 2-2,5 y de 2,5-3,0 en los pacientes con pr—tesis valvulares. En nuestro estudio no hemos encontrado diferencia signi- ficativa entre el sangrado postoperatorio y el tipo de hemos- tasia practicada, coincidiendo con algœn estudio (32) en que en la mayor’a de los casos es suficiente la aplicaci—n de esponjas hemost‡ticas de gelatina y sutura. CONCLUSIONES Hay una necesidad evidente de protocolizar los procedi- mientos de cirug’a oral en pacientes sometidos a TAO, tanto por la gravedad de las complicaciones como por la frecuen- cia creciente de la demanda, que puede cuantificarse en algunos casos en el 8% de los pacientes referidos desde atenci—n primaria al hospital para tratamiento quirœrgico oral (33). Consideramos que los pacientes en TAO no deben suspenderlo previamente a la cirug’a oral si bien deber’a realizarse con control multidisciplinario (34), especialmen- te si se trata de mayores de 65 a–os o con patolog’a conco- mitante como insuficiencia renal o anemia o con otros trata- mientos mŽdicos. MEDICINAORALVOL. 7 / N.o 1 ENE.-FEB. 2002 6666
  • 5. MEDICINAORALVOL. 7 / N.o 1 ENE.-FEB. 2002 6767 Oralsurgeryinthepatients undergoingoral anticoagulanttherapy SUMMARY There is an evident need for procedural protocol for oral surgery patients who undergo oral anticoagulant treatment (OAT) because of: 1) the possible severity of complications and 2) the growing demand for OAT, which in some cases may be as much as 8% of the oral surgery patients that are referred to the hospital from primary care centers. In this study, the authors define the parameters for creating a proto- col applicable to this group of patients. The conclusion is that it is not necessary to suspend OAT before surgery; rather, these procedures should be performed under multidiscipli- nary medical control. Objective: The authors demonstrate that it is possible to perform oral surgery on OAT patients, without having to sus- pend treatment beforehand. Study design: A longitudinal study was performed in OAT patients that required some type of oral surgical procedures. After an INR control, the patient underwent surgery and after- wards the patient was given tranexamic acid as a mouth rinse. Postoperative hemorrhage was classified as slight when it las- ted less than 5 minutes, moderate when it lasted longer than five minutes, and severe when it required blood transfusion. Results: The study was performed over a 5-year period (1996-2000), by the maxillofacial surgery department. In that time period, 125 patients with OAT were treated; 90 of them were males and 35 were females. Tooth extraction was per- formed in 229 sessions and a total of 367 teeth were extrac- ted, with an average of 1.6% per session. With regards to pos- toperative hemorrahage, it was slight in 210 cases (91.7%), moderate in 18 (7.9%) and severe only in one case (0.4%). All the variables were compared and no statistically signifi- cant differences were found. Conclusions: We believe that OAT should not be suspen- ded before oral surgery, but it surgery should be performed under multidisciplinary controlÑespecially in the case of the elderly (over 65) or with those patients that have other con- comitant illnesses such as renal insufficiency or anemia or other medical treatments. Key words: oral surgery, oral anticoagulant treatment, tranexamic acid. INTRODUCTION Oral anticoagulants are used to treat venous thromboembo- lisms, as well as for the prevention of systemic infarcts and sys- temic embolisms in patients with auricular fibrillation, cardiac valve disease, or in patients with metallic valve prosthesis (1). Nowadays, the most common oral anticoagulant agent is warp- harine sodium, although its use requires close laboratory analy- sis control since its effectiveness can be altered by various fac- tors, including the individual reaction of the patient, the patientÕs diet, as well as by the simultaneous administration of other medicines. As a main monitoring tool, the prothrombine time (PT) is used, although since 1983 the WHO recommends the use of the International Normalized Ratio (INR) as a means of standardizing the PT among different laboratories (2). There is substantial risk of haemorrhage when OAT patients need to undergo some type of oral surgery procedu- re. Historically we have always had the options of either sus- pending the anticoagulant dosis, with the consequential risk of thromboembolism, or to continue treatment under increa- sed risk of postoperative bleeding. In this article we present out experience in treating these patients. The study was ela- borated during a 5-year period, beginning in 1996. MATERIAL AND METHODS This study was elaborated and performed in the Departments of Stomatology, Oral and Maxillofacial Surgery and Haematology as well as in the Research Unit of the Insular University Hospital of Las Palmas, Canary Islands, Spain, previously approved by the Research Commission of the same hospital and with consent from all patients included. We included all patients which needed to undergo oral sur- gical procedures and who were also in OAT with acenocuma- rol (Sintrom¨; Geigy) and were previously controlled in the Haematology Department. These patients were sent to the Department of Stomatology, Oral and Maxillofacial Surgery to set a date for ambulatory intervention. On the indicated day, the INR was measured to assure that the results were wit- hin range, according to the basic pathology of the patient. If it was, the surgical intervention was performed immediately. Local anaesthesia of 2% Lidocaine with epinephrine (Octocain¨; Clarben) was used. The local haemostasis met- hods were initially defined by the Haematology Department, regardless of the number of teeth to be extracted and the pos- sible complexity of the intervention. Both the osteotomy and leverage during surgical procedure were considered as com- plex extraction. By doing so, we avoided using a lower level of haemostasis that was dependent soley on the surgeonÕs impressions. The various methods of haemostasia applied were as: compressive haemostatic gauze (Surgicel¨ Ethicon, Johnson&Johnson) alone or with suture, suture alone or local compression with devices, during 20 minutes after surgery. After surgery, the patients received a synthetic antifibri- nolytic agent, tranexamic acid (Anchafibrin¨ Fides), first as local compression and afterwards as a mouth rinse, for 2 minutes every 6 hours during two days. The post-surgical haemorrhage was classified as low when it lasted less than 5 minutes after surgery, moderate when it lasted over 5 minu- tes, and severe when it required a transfusion.
  • 6. MEDICINAORALVOL. 7 / N.o 1 ENE.-FEB. 2002 6868 In the cases where antibiotic prophylaxis due to endocarditis was needed, usually Amoxicillin (Clamoxyl¨ Smith-Kline Beecham) was recommended, and given in doses of 2 g orally one hour before the intervention and 1 g six hours after the inter- vention. When the allergy to penicillin was reported, erythromy- cin (Pantomicine¨ Abbot) was administered, 2 g before inter- vention and 1 g six hours after surgery. When it was possible, antibiotic treatment was not applied for longer periods of time, to avoid adverse interactions and possible delayed haemorrha- ge. There have been reports of delayed haemorrhage in patients who were given OAT and amoxicilin at the same time (3). The statistical package SPSS 10.0 was used for data analy- sis. For the qualitative values, relative, absolute and percenta- ge frequency were determined; for the quantitative values, the central tendency and the standard dispersion were measured. For measurement of the existing association between the two qualitative variables, the Chi2 test was performed with a con- fidence level of 95%. To measure the degree of association the Odds Ratio was employed. To determine the difference betwe- en the quantitative variables, the T-Student test was used. The confidence level used in analysis was of 95%. RESULTS During a 5-year period (1996-2000), 125 patients with OAT were seen by the Maxillofacial Surgery Department of the Insular University Hospital in Las Palmas, Canary Islands. Of these, 90 were males and 35 were females. A total of 367 teeth were extracted in 229 sessions, with an average of 1.6 teeth extracted per patient (Table 1). The basic disea- ses that required OAT are reflected in Table 2. Table 3 enu- merates the associated pathologies in these patients. The con- comitant treatments to OAT that these patients had was also controlled, to avoid interferences with the coagulation; this is shown in Table 4. In 35 patients during 47 sessions, the endo- carditis prophylaxis was administered, following the pre- viously established protocol. Regarding INR before surgery, it was between 2 and 2.5 in 145 cases and in another 84 situa- tions it was between 2.5 and 3. Nineteen of the sessions were considered complex surgery, 7 of them due to root leverage use and 12 because of osteotomy. The type of haemostasis used in these procedures is sum- marized in Table 5. The postoperative hemorrhage was slight in 210 of the cases (91.7%), moderate in 18 (7.9%), and severe only in one case (0.4%). All variables were compared and analysed, including pre- operative INR, the number of teeth extracted in one session, the existence of trauma during teeth extraction, the adminis- tration of endocarditis prophylactic treatment, as well as the type of post surgical haemostasis. No statistically significant differences or relationships were found. DISCUSSION The oral surgery procedures in OAT patients has always been very controversial due to the dilemma between the high risk of hemorrhage versus the possibility of embolism should the OAT be suspended (4). Some authors recommend not changing the OAT treatment (5-8), while others propose the suspension of OAT alto- gether for several days before the surgical intervention (9-13), or substitution with heparin in patients with high risk level (14, 15). In the current literature there are more than 500 articles advocating the suspension of OAT for oral or dental surgical interventions (16). Although the majority of these patients did not have any complications, four of them died due to embolism complications and another suffered two episodes of embolism. Certainly, this percentage is very low (approximately 1%), but such grave sequels as consequence of tooth extraction obliges that attention be rightly paid. On another front, of the 2400 cases of dental surgery reported and performed in 950 patients without OAT suspension, there were only 12 hemorrhage com- plications described, and treated favorably (16). Sindet-Pedersen et al. in 1989 in their study (17), recom- mended the use of gauze soaked in tranexamic acid immedia- tely after tooth extraction, combined with local pressure for a few minutes and the us of oral rinse devices during one TABLE 1 Number of teeth extracted per session N¼ extractions N¼ % Total % per session of sessions Extractions 1 144 63 144 39.2 2 51 22.3 102 27.8 3 20 8.7 60 16.4 4 10 4.3 40 11 5 3 1.3 15 4 6 1 0.4 6 1.6 TOTAL 229 100 367 100 TABLE 2 Basic diseases Basic disease Patients Auricular fibrillation 57 Cerebro vascular Insult 18 Pathology of the valves 17 Prosthesis of the valves 10 Aortic atheromatosis 2 Acute myocardial infarct 2 Lung thromboembolism 15 Dilatation myocardiopathy 4 TOTAL 125
  • 7. MEDICINAORALVOL. 7 / N.o 1 ENE.-FEB. 2002 6969 weekÑa method used also by others (18-22). Nevertheless, Souto et al. in 1996 (23), compared the treatment performed on 92 patients in which the OAT was not reduced, with the ones where it was substituted for heparin, and reported no hemorrhage complications in spite of reducing mouth rinsing form 7 to 2 days. Regarding of this, in our protocol the pos- ture was to apply mouth rinse with tranexamic acid two minu- tes every sic hours during two days. In difference with these findings, we did not use gauze and suture over the wounds routinely; rather, these were used randomly if at all, without ever observing any increase of complications. Tranexamic acid is generally well tolerated by patients. Adverse effects are rare and if they do occur, are generally manifested as nausea, diarrhea and occasionally as orthosta- tic arterial hypotension (24). In our study, tranexamic acid was used only locally, so we did not have any complaint on it, nor have we seen any complications associated with it. In some publications the quantitative measurement is noted in millimeters of hemorrhage (6). Our objective was not to measure bleeding, but merely to measure the time of visible post-operative hemorrhage. Other authors (25, 26) do not use tranexamic acid; instead they perform haemostasis with gelatine resolvable sponges, sutu- re and fibrin adhesives (Tissucol ¨; Immuno), with good results, albeit more expensive ones. Nevertheless, these systems of hae- mostasis have recently been suspended due to risk of transmitting certain diseases, as well as due to its elevated cost. The preferred alternative has been the use of dense autologous fibrin obtained through centrifuging the autologous blood (27-31) With respect to preoperational INR we follow Wahl et al. (4), observing in most cases a value between 2-3 and values between 2.5-3.0 in patients with prosthetic heart valves. We have not found any significant differences between post surgical bleeding and the system of haemostasis used in each patient. We agree with other authors (32) that in most cases the application of gelatine resolvable sponges and suture is sufficient for our purposes. CONCLUSIONS Certainly there is an evident need to make a protocol for oral surgery procedures in the patients with OAT, as well as for serious complications of these. This need is aggravated by the increased demand: 8% of all patients that are referred to hospitals from outpatient facilities (33). We believe that oral treatment prior to surgery should not be suspended, as long as treatment is administrated in specialised facilities which provide a multidisciplinary approach for a patientÕs control (34), particularly for the patients over 65 years and/or with concomitant pathology e.g. kidney disease, anaemia or pro- longed medical treatment. TABLE 3 Associated pathologies Associated pathology Patients Diabetes Mellitus 3 Pernicious Anemia 1 Arterial hypertension 7 Arthrosis 1 Asthma 1 Neoplastic pathology 3 Cor pulmonale 8 Systemic eritematous lupus 1 Ischemic heart disease 4 Hypoproteinemia 1 Aortic atheromatosis 2 TOTAL 32 TABLE 4 Associated medical treatment Associated medical treatment Patients Antihypertensive 20 Diuretics 5 Digoxina 11 Coronary vasodilatators 1 Analgesics no deriving from AAS 1 Vitamin complexes 1 Interferon 1 TOTAL 40 TABLE 5 Type of haemostasis Type of haemostasis Patients Haemostatic gauze 119 Haemostatic gauze + Suture 48 Suture 2 Compressive devices 60 TOTAL 229 CORRESPONDENCIA/CORRESPONDENCE Mario Vicente Barrero C/ Garc’a Morato 30 35011-Las Palmas de Gran Canaria Tfno.: 928-257791. Fax: 928-602951. E-mail: mvicente@idecnet.com
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