The document outlines the preoperative workup and anesthetic setup for functional endoscopic sinus surgery, detailing essential steps like confirming diagnosis, reviewing medical history, and gathering relevant investigations. It emphasizes the importance of optimizing the patient's preoperative condition, ensuring informed consent, and preparing the operating room with appropriate equipment and instruments. Additionally, it discusses the advantages and disadvantages of both local and general anesthesia in relation to surgical outcomes.

1. FUNCTIONAL
ENDOSCOPIC SINUS
SURGERY
PRE OP WORK UP
OT SET UP
ANAESTHESIA
Dr.SHILPA M J

2. PRE OPEATIVE CHECKLIST
1 Confirm the diagnosis.
2 Review previous medical treatment.
3 Optimize the immediate preoperative condition.
4 Check that relevant investigations have been done
5 Review the relevant medical history, e.g., drug
allergies , medication.
6 Preoperative CT checklist.
7 Planning and staging the procedure.
8 Informed consent.

3. CONFIRM THE DIAGNOSIS
Genuine chronic bacterial rhinosinusitis who do
not respond to medical treatment.
Diagnosis that is likely to respond, at least in
part, to surgical intervention.
Surgery will not help
CT is normal - without evidence of sinus disease.
tension-type headache.
allergic rhinitis is very unlikely to help

4. REVIEW THE PREVIOUS
MEDICAL TREATMENT
A short-lived improvement in the nasal airway with only a
minimum and transient improvement in the sense of smell
after a course of oral steroids will lead the surgeon to give
a more guarded prognosis about the benefits of surgery.
A short-lived response to maximal medical treatment
would also indicate that long-term medical treatment after
surgery may be required.

5. OPTIMIZE THE IMMEDIATE
PREOPERATIVE CONDITION
Reducing the amount of inflammation
at the time of surgery will make the
operative field easier work in.
In Infective rhinosinusitis - Patient
should have had at least a minimum
of 2 weeks of a broad-spectrum
antibiotic with anaerobic cover.

6. Allergic Rhinitis - prophylactic nonsedative
antihistamine preoperatively as this will reduce
hyperreactivity and the amount of exudate that occurs
with surgery.
Check compliance with topical nasal steroids
In severe nasal polyposis, and if reduction or absence
of sense of smell, a course of oral steroids in the week
before surgery should help reduce surgical damage to
the olfactory mucosa.

7. RELEVANT INVESTIGATION
ALLERGY TESTS
IMMUNE STATUS
HEAMATOLOGICAL PARAMETERS
OLFACTION
VISION

8. ALLERGY TESTS
Skin-prick tests - define the allergens AND
surgery on its own may not be the whole
solution.
Total IgE – Positive in 60% of patients with
allergic rhinitis
Peak flow meter - to check for possible
asthma.
Rhinomanometry and acoustic rhinometry are
mainly used as research tools.

9. IMMUNE STATUS
Saccharin clearance test - If ciliary
dysmotility is suspected because of
coexisting bronchiectasis or a failure to
respond to medical treatment.
If a patient has had two or more serious
sinus infections within a year or has had
two or more courses of antibiotics with
little effect, then their immunity should
be investigated (Jeffery Modell
Foundation).

10. The first-line investigations include microbial samples
for cultures;a full blood count with differential white cell
count; immunoglobulins IgG, IgA, IgM; vaccine specific
IgG responses to tetanus, Hib, and pneumococcus;
electrolytes and urea; liver function tests and a fasting
blood glucose; and an HIV test.
Second-line investigations include a nitroblue
tetrazolium reduction test; IgG subclasses; functional
complement assays;and tests for cell-mediated
immunity
Abnormal test results or a strong suspicion justify
referral to an immunologist.

11. HAEMATOLOGICAL
PARAMETERS
Hemoglobin
differential white cell
count
clotting studies
Electrolytes
liver and kidney
function test

12. OLFACTION
Document whether it is already
absent or reduced.
Mention to the patient the risks of
surgery to their sense of smell.
OLFACTORY TESTS :
The 20-page UPSIT scratch-and-sniff
test.
A threshold olfactometer is used in
research.

13. VISION
Asking the patient preoperatively whether they
have any visual problems and whether any
problem is with visual acuity or double vision
Defines any problem preoperatively and will help
to obviate any postoperative recrimination that
surgery has led to a problem that in fact was
already present
look for any alteration in the axis of the pupils from
the front because this is more frequently the cause
of diplopia than is proptosis

14.  The loss of color discrimination, particularly of red, is a
worrying symptom of pressure on the optic nerve.
Left enophthalmos due to silent sinus syndrome—
involution of the maxillary sinus with collapse of its
roof

15. REVIEW THE RELEVANT
MEDICAL HISTORY
Document allergies to drugs such as
penicillin and nonsteroidal anti-
inflammatory drugs.
 If the patient is taking aspirin, it is
advisable to ask them to stop taking it
at least 14 days before the day of their
surgery in order to reduce bleeding.

16. PREOPERATIVE CT CHECKLIST
STEP 1 : orientate the CT scan
sequence from anterior to posterior and
ensure that the sides are marked and
placed as though as you are looking at
the patient.
Follow the cuts anterior to posterior;
follow the septum, note any deviation,
and look for the size and extent of the
ethmoidal bulla, which is a relatively
consistent landmark

17.  STEP 2 : Examine the lamina papyracea, uncinate
process, and middle turbinate.
Define the site and insertion of the uncinate
process and its proximity to the lamina papyracea.
Examine whether there is a middle turbinate, as its
absence is one of the main factors associated with
complications involving the orbit and the skull
base.
Look for an infraorbital cell.

18. Localize the uncinate process (arrow) from its free margin posteriorly
and follow it anteriorly and upward

19.  a The uncinate process inserting into the
skull base (arrow) on the right.
 b The uncinate process inserting into
the middle turbinate (arrow) on the right.
 c The uncinate process inserting into
the lateral nasal wall (arrow) on the right
and the middle turbinate on the left.

20.  The right uncinate process
originating from the lamina
papyracea.
An absent middle turbinate is a
significant risk factor

21.  Hypoplasia of the maxillary
sinuses
A left infraorbital cell (arrow),
whose roof looks thin

22. STEP 3 :
Examine the area of the frontal recess.
The infundibulum expands superiorly to form the
frontal recess, but the way it does so varies.
If an agger nasi cell is well pneumatized and it
extends into the frontal sinus,it is called a bulla
frontalis.

23.  Serial CT scans in the same patient.
 a Bilateral bulla frontalis.
 b Bulla frontalis and the start of agger nasi cells below

24.  c The attachment of the uncinate process.
 d Bilateral suprabullar recesses and supraorbital cells.

25. STEP 4 :
Determine the height of the skull base.
A well pneumatized supraorbital cell will cause the
anterior ethmoid artery to traverse the ethmoid in a
separate channel below the ethmoid roof.
Approximately 18% of patients have an Onodi
(sphenoethmoid) air cell, which increases the risk
to the optic nerve. An Onodi cell is a posterior
ethmoid cell that is lateral to the sphenoid sinus.

26.  Variations of the position of the cribriform plate that depend
on the degree of pneumatization of the skull base

27.  Variations of the position of the cribriform plate that depend
on the degree of pneumatization of the skull base

28.  Sequential CT scans showing the anterior ethmoid artery
leaving the orbit across the ethmoid sinuses to the septum.

29.  These two CT scans show how the degree of pneumatization
between the left and right side affects the exposure of the
anterior ethmoid artery. The presence of a supraorbital cell (*)
makes it more likely that the anterior ethmoid artery is
dehiscent (arrow).

30.  a Axial, b coronal, and c
sagittal CT scans of
sphenoethmoid air cells
(arrows).

31. STEP 5 :
Examine the sphenoid sinus.
The sphenoid septum is frequently asymmetrical
and may attach laterally to the prominence created
by the internal carotid artery or the optic canal.
It is important to note whether the carotid artery is
medially placed or dehiscent.

32.  Sphenoid intersinus septum going to the carotid artery on
both sides.

33.  An axial CT scan showing dehiscent optic nerves (arrow) in
the sphenoid sinus. b Coronal CT scan showing dehiscent
optic nerves (arrow) and thin bone over both carotid arteries

34.  a Soft-tissue window settings fail to show the medially placed
orbital contents revealed in the high-resolution image.

35. INFORMED CONSENT
Informed consent to be taken when surgery is
considered both when the patient is visiting as an
outpatient and whenever possible on admission
before their surgery.
The following issues need to be addressed
Benefits and risk of surgery
Time off work
Specific Complications - External Incision, Local
Osteitis causing a dull, severe nagging ache that
lasts for 10 days before abating.
Infection, Recurrent Polyposis,Visual
Complications

36. OPERATING ROOM SET UP
Operating Table :
The patient should be prone and the operating
table tilted to 30 degrees anti-Trendelenburg.
The patient’s head should be in a neutral position
(neither flexed or extended).
This allows the surgeon to operate in a plane
parallel to the skull base, which diminishes the risk
to skull base by decreasing the angle of approach.

37. Surgeon’s Seat :
An adjustable seat allows the surgeon to find a
comfortable position that will reduce fatigue and
neck problems.
The surgeon may stand and operate
The surgeon is seated, with arm support to reduce
fatigue and stabilize the arm holding the camera.

38. Standing position

39. Video Stack/Cameras :
operate from the screen on the video stand that is
positioned directly opposite the surgeon at a level
just above the plane of the surgeon’s visual axis.
This is good for posture, in particular for the neck
.
The screen should be positioned at a level that
makes the surgeon raise their head just a little, as
this will encourage good posture.
A good light source is one of the most critical
factors in obtaining a good image

40.  A three-chip camera gives a much better image. The stack
may also hold the drive for powered instrumentation and an
image recording system.
The stack system is positioned in
front of the surgeon.

41. Cables :
The light cable and camera lead should be clipped
to the drapes so that their weight going to the stack
does not pull on the surgeon’s supporting hand.
Other cables from powered instrumentation such
as suction and navigation should be lined up
parallel on the surface top.

42.  The cables can be arched over the surgeon’s operating hand or
held toward the patient’s head so that they are not in the way.

43. Lighting :
For optimal viewing, the screen should have a
relatively dim background.
Radiograph Screen :
The CT scans must be placed in order on a screen
for the surgeon to inspect before and during the
procedure.

44. Ancillary Staff :
The value of a good surgical assistant cannot be
overestimated.To be passed the correct instrument
to fit the hand at the right moment saves time.
Having the correct instrument placed in the hand
saves the surgeon turning their head to look away
from the screen.
A conscientious assistant who looks out for any
movement of the eye when the surgeon is
operating on the lateral nasal wall can save
damage to the patient’s eye.

45. INTRUMENTS :
Endoscopes
The majority of surgery is best done using a 0°
4mm endoscope, which allows good illumination.
Even in a child or a narrow nose it is easier to
operate with this than with a 2.7mm scope. A 4mm
scope is also more robust. The use of a 0° scope
means that the operator is working in line with their
normal visual axis and is less likely to veer off
course.
Most of the paranasal sinuses can be visualized
with a 0° scope, with the exception of the lateral,
medial, and inferior walls of the maxillary sinus.

46.  A = 30-degree telescope. B = 70-degree telescope (optional). C = 360-
degree backbiting forceps. D = 360-degree sphenoid punch or forceps.
E = 3.5-mm upbiting through-cut forceps. F = 3.5-mm straight through-
cut forceps. G = 4 mm long curved suction. H = calibrated straight
(Frazier) suction. I = Cottle periosteal elevator. J = ostium seeker or ball
probe, which is angled at one end and curved at the other

47.  These instruments can be useful when performing an extended
frontal or sphenoid sinusotomy. A = giraffe forceps. B = frontal
curette. C = frontal rasp. D = angled cervical spine curette.

48. ANAESTHESIA
LOCAL ANAESTHESIA :
ADVANTAGES:
It can be done as a day-stay procedure.
 The surgeon has to be gentle with tissue, thereby
encouraging preservation of mucosa.
 Whether owing to the instillation of local
anesthetic agents with a vasoconstrictor or to
endogenous epinephrine, there is less
peroperative bleeding.
.


49.  In a patient who is deemed to be unfit for a
general anesthetic, a moderate amount of
endoscopic surgery can be done under local
anesthesia.
It is possible to monitor vision, and the risk of
orbital complications is reduced as the patient will
notice if the surgeon enters the orbit.

50. DISADVANTAGES :
More extensive procedures such as surgery in the
posterior ethmoids, frontal recess, or sphenoid are
uncomfortable with local anesthesia.
Under local anesthesia a moderate degree of
sedation may be needed, it may result in coughing
and spluttering if the cough reflex has partially
been supressed.
For most patients having extensive surgery done
under local anesthesia, an anesthetist, is required
to provide controlled sedation.

51. GENERAL ANAESTHESIA :
ADVANTAGES :
The surgeon is freed from worrying about whether
the patient feels discomfort from the surgery.
 It is possible to access areas that are not readily
anaesthetized with local anesthetic, for example,
the frontal recess and the sphenoid.
 It is worth giving local anesthesia at the same time
in order to help reduce the amount of general
anesthetic required and limit immediate
postoperative pain. It also helps reduce bleeding
as it usually also contains vasoconstrictor.

52. If bleeding is moderate or marked, it can be
sucked out as the patient is not distressed by
having to repeatedly spit out blood.
In infected cases, local anesthetic works poorly
and general anesthesia has a distinct advantage;
for example, it is difficult to anesthetize a patient
with acute sinusitis using local anesthetic even for
a minor procedure such as a maxillary antral
washout.
 The patient is unaware of unpleasant
sensations,even when these do not cause pain, for
example, vibrations from a drill

53. DISADVANTAGES :
Attention to detail and respect for the mucosa is no
longer encouraged by the complaints of a
conscious patient.
 The patient no longer provides an early warning to
indicate that the orbit has been breached or
entered.
 There are general risks associated with a general
anesthetic, immediate postoperative recovery, and
the likelihood of requiring an overnight stay.

54. There tends to be more mucosal bleeding than
under local anesthesia. This may in part be due to
less local vasoconstrictor having been used, or to
a reduction in the amount of endogenous
epinephrine.

55. GENERAL ANAESTHETIC
TECHNIQUE TO PROVIDE A
BETTER OPERATIVE FIELD
A smooth induction, peroperative anesthesia, and
reversal leads to less bleeding. Coughing on a
cuffed tube will result in a great deal of bleeding. If
this happens, it is best to wait until the patient has
settled.
Position the patient 20° body-up during surgery.
The use of topical vasoconstrictors (and allowing
sufficient time for them to work).

56. Do not rely on vasodilatation to induce hypotension
as this will result in more bleeding.
If hypotensive techniques are used, it is best to
keep the mean blood pressure between 65 and 75
mmHg.
 The use of a laryngeal mask reduces stimulation
to the airway, particularly on extubation.
 Beta blockers need to be used with extreme care,
and not in asthmatics.

57. THANK YOU