Spaces of middle ear and their surgical importanceDr Soumya Singh
one of the imp topics in ENT that should be understood very thoroughly if u want to pursue as an otologist.I tried to simplify the topic with simple diagrams and models for better understanding .
Complications of rhinosinusitis(Dr ravindra daggupati)Ravindra Daggupati
orbital complications of rhino sinusitis,intra cranial complications of rhino sinusitis,classification of complications,diagnosis and treatment of complications
Spaces of middle ear and their surgical importanceDr Soumya Singh
one of the imp topics in ENT that should be understood very thoroughly if u want to pursue as an otologist.I tried to simplify the topic with simple diagrams and models for better understanding .
Complications of rhinosinusitis(Dr ravindra daggupati)Ravindra Daggupati
orbital complications of rhino sinusitis,intra cranial complications of rhino sinusitis,classification of complications,diagnosis and treatment of complications
Rare presentation of left maxillary sinusitis: A Case Reportiosrphr_editor
The IOSR Journal of Pharmacy (IOSRPHR) is an open access online & offline peer reviewed international journal, which publishes innovative research papers, reviews, mini-reviews, short communications and notes dealing with Pharmaceutical Sciences( Pharmaceutical Technology, Pharmaceutics, Biopharmaceutics, Pharmacokinetics, Pharmaceutical/Medicinal Chemistry, Computational Chemistry and Molecular Drug Design, Pharmacognosy & Phytochemistry, Pharmacology, Pharmaceutical Analysis, Pharmacy Practice, Clinical and Hospital Pharmacy, Cell Biology, Genomics and Proteomics, Pharmacogenomics, Bioinformatics and Biotechnology of Pharmaceutical Interest........more details on Aim & Scope).
Drs. Potter and Richardson's CMC Pediatric X-Ray Mastery week 1Sean M. Fox
Drs. Potter and Richardson are interested in education and Pediatric Emergency Medicine. Follow along with the EMGuideWire.com team as they post these weekly educational, self-guided radiology slides on Pediatric Emergency Medicine Radiology Topics!
The Medicine in Remote Areas (MIRA) Manual is a comprehensive guide designed for medical professionals, emergency responders, and individuals operating in isolated and challenging environments. This manual provides essential knowledge and practical skills necessary for delivering effective medical care where traditional medical resources and immediate evacuation are not readily available.
Expertly crafted, the MIRA Manual covers a wide range of topics, including emergency response planning, trauma management, illness diagnosis, and long-term care in remote settings. Readers will find detailed sections on environmental medicine, addressing challenges such as extreme weather conditions, and wilderness first aid techniques. The manual also delves into specific medical conditions and injuries that are likely to be encountered in remote areas, offering step-by-step procedures for treatment and stabilization.
Ideal for expedition medics, military personnel, remote site workers, and adventure enthusiasts, the MIRA Manual is an invaluable resource for anyone responsible for providing medical care in off-grid locations. It combines theoretical knowledge with practical approaches, ensuring that readers are well-equipped to handle a variety of medical situations in remote settings.
Lung Cancer: Artificial Intelligence, Synergetics, Complex System Analysis, S...Oleg Kshivets
RESULTS: Overall life span (LS) was 2252.1±1742.5 days and cumulative 5-year survival (5YS) reached 73.2%, 10 years – 64.8%, 20 years – 42.5%. 513 LCP lived more than 5 years (LS=3124.6±1525.6 days), 148 LCP – more than 10 years (LS=5054.4±1504.1 days).199 LCP died because of LC (LS=562.7±374.5 days). 5YS of LCP after bi/lobectomies was significantly superior in comparison with LCP after pneumonectomies (78.1% vs.63.7%, P=0.00001 by log-rank test). AT significantly improved 5YS (66.3% vs. 34.8%) (P=0.00000 by log-rank test) only for LCP with N1-2. Cox modeling displayed that 5YS of LCP significantly depended on: phase transition (PT) early-invasive LC in terms of synergetics, PT N0—N12, cell ratio factors (ratio between cancer cells- CC and blood cells subpopulations), G1-3, histology, glucose, AT, blood cell circuit, prothrombin index, heparin tolerance, recalcification time (P=0.000-0.038). Neural networks, genetic algorithm selection and bootstrap simulation revealed relationships between 5YS and PT early-invasive LC (rank=1), PT N0—N12 (rank=2), thrombocytes/CC (3), erythrocytes/CC (4), eosinophils/CC (5), healthy cells/CC (6), lymphocytes/CC (7), segmented neutrophils/CC (8), stick neutrophils/CC (9), monocytes/CC (10); leucocytes/CC (11). Correct prediction of 5YS was 100% by neural networks computing (area under ROC curve=1.0; error=0.0).
CONCLUSIONS: 5YS of LCP after radical procedures significantly depended on: 1) PT early-invasive cancer; 2) PT N0--N12; 3) cell ratio factors; 4) blood cell circuit; 5) biochemical factors; 6) hemostasis system; 7) AT; 8) LC characteristics; 9) LC cell dynamics; 10) surgery type: lobectomy/pneumonectomy; 11) anthropometric data. Optimal diagnosis and treatment strategies for LC are: 1) screening and early detection of LC; 2) availability of experienced thoracic surgeons because of complexity of radical procedures; 3) aggressive en block surgery and adequate lymph node dissection for completeness; 4) precise prediction; 5) adjuvant chemoimmunoradiotherapy for LCP with unfavorable prognosis.
These lecture slides, by Dr Sidra Arshad, offer a quick overview of physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar leads (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Ve...kevinkariuki227
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
TEST BANK for Operations Management, 14th Edition by William J. Stevenson, Verified Chapters 1 - 19, Complete Newest Version.pdf
Ethanol (CH3CH2OH), or beverage alcohol, is a two-carbon alcohol
that is rapidly distributed in the body and brain. Ethanol alters many
neurochemical systems and has rewarding and addictive properties. It
is the oldest recreational drug and likely contributes to more morbidity,
mortality, and public health costs than all illicit drugs combined. The
5th edition of the Diagnostic and Statistical Manual of Mental Disorders
(DSM-5) integrates alcohol abuse and alcohol dependence into a single
disorder called alcohol use disorder (AUD), with mild, moderate,
and severe subclassifications (American Psychiatric Association, 2013).
In the DSM-5, all types of substance abuse and dependence have been
combined into a single substance use disorder (SUD) on a continuum
from mild to severe. A diagnosis of AUD requires that at least two of
the 11 DSM-5 behaviors be present within a 12-month period (mild
AUD: 2–3 criteria; moderate AUD: 4–5 criteria; severe AUD: 6–11 criteria).
The four main behavioral effects of AUD are impaired control over
drinking, negative social consequences, risky use, and altered physiological
effects (tolerance, withdrawal). This chapter presents an overview
of the prevalence and harmful consequences of AUD in the U.S.,
the systemic nature of the disease, neurocircuitry and stages of AUD,
comorbidities, fetal alcohol spectrum disorders, genetic risk factors, and
pharmacotherapies for AUD.
ARTIFICIAL INTELLIGENCE IN HEALTHCARE.pdfAnujkumaranit
Artificial intelligence (AI) refers to the simulation of human intelligence processes by machines, especially computer systems. It encompasses tasks such as learning, reasoning, problem-solving, perception, and language understanding. AI technologies are revolutionizing various fields, from healthcare to finance, by enabling machines to perform tasks that typically require human intelligence.
Report Back from SGO 2024: What’s the Latest in Cervical Cancer?bkling
Are you curious about what’s new in cervical cancer research or unsure what the findings mean? Join Dr. Emily Ko, a gynecologic oncologist at Penn Medicine, to learn about the latest updates from the Society of Gynecologic Oncology (SGO) 2024 Annual Meeting on Women’s Cancer. Dr. Ko will discuss what the research presented at the conference means for you and answer your questions about the new developments.
New Drug Discovery and Development .....NEHA GUPTA
The "New Drug Discovery and Development" process involves the identification, design, testing, and manufacturing of novel pharmaceutical compounds with the aim of introducing new and improved treatments for various medical conditions. This comprehensive endeavor encompasses various stages, including target identification, preclinical studies, clinical trials, regulatory approval, and post-market surveillance. It involves multidisciplinary collaboration among scientists, researchers, clinicians, regulatory experts, and pharmaceutical companies to bring innovative therapies to market and address unmet medical needs.
Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
Dr. Vidisha Kumari, a leading epidemiologist in Bangalore, emphasizes the importance of getting vaccinated. "The flu vaccine is our best defense against the influenza virus. It not only protects individuals but also helps prevent the spread of the virus in our communities," he says.
This year, the flu season is expected to coincide with a potential increase in other respiratory illnesses. The Karnataka Health Department has launched an awareness campaign highlighting the significance of flu vaccinations. They have set up multiple vaccination centers across Bangalore, making it convenient for residents to receive their shots.
To encourage widespread vaccination, the government is also collaborating with local schools, workplaces, and community centers to facilitate vaccination drives. Special attention is being given to ensuring that the vaccine is accessible to all, including marginalized communities who may have limited access to healthcare.
Residents are reminded that the flu vaccine is safe and effective. Common side effects are mild and may include soreness at the injection site, mild fever, or muscle aches. These side effects are generally short-lived and far less severe than the flu itself.
Healthcare providers are also stressing the importance of continuing COVID-19 precautions. Wearing masks, practicing good hand hygiene, and maintaining social distancing are still crucial, especially in crowded places.
Protect yourself and your loved ones by getting vaccinated. Together, we can help keep Bangalore healthy and safe this flu season. For more information on vaccination centers and schedules, residents can visit the Karnataka Health Department’s official website or follow their social media pages.
Stay informed, stay safe, and get your flu shot today!
Tom Selleck Health: A Comprehensive Look at the Iconic Actor’s Wellness Journeygreendigital
Tom Selleck, an enduring figure in Hollywood. has captivated audiences for decades with his rugged charm, iconic moustache. and memorable roles in television and film. From his breakout role as Thomas Magnum in Magnum P.I. to his current portrayal of Frank Reagan in Blue Bloods. Selleck's career has spanned over 50 years. But beyond his professional achievements. fans have often been curious about Tom Selleck Health. especially as he has aged in the public eye.
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Introduction
Many have been interested in Tom Selleck health. not only because of his enduring presence on screen but also because of the challenges. and lifestyle choices he has faced and made over the years. This article delves into the various aspects of Tom Selleck health. exploring his fitness regimen, diet, mental health. and the challenges he has encountered as he ages. We'll look at how he maintains his well-being. the health issues he has faced, and his approach to ageing .
Early Life and Career
Childhood and Athletic Beginnings
Tom Selleck was born on January 29, 1945, in Detroit, Michigan, and grew up in Sherman Oaks, California. From an early age, he was involved in sports, particularly basketball. which played a significant role in his physical development. His athletic pursuits continued into college. where he attended the University of Southern California (USC) on a basketball scholarship. This early involvement in sports laid a strong foundation for his physical health and disciplined lifestyle.
Transition to Acting
Selleck's transition from an athlete to an actor came with its physical demands. His first significant role in "Magnum P.I." required him to perform various stunts and maintain a fit appearance. This role, which he played from 1980 to 1988. necessitated a rigorous fitness routine to meet the show's demands. setting the stage for his long-term commitment to health and wellness.
Fitness Regimen
Workout Routine
Tom Selleck health and fitness regimen has evolved. adapting to his changing roles and age. During his "Magnum, P.I." days. Selleck's workouts were intense and focused on building and maintaining muscle mass. His routine included weightlifting, cardiovascular exercises. and specific training for the stunts he performed on the show.
Selleck adjusted his fitness routine as he aged to suit his body's needs. Today, his workouts focus on maintaining flexibility, strength, and cardiovascular health. He incorporates low-impact exercises such as swimming, walking, and light weightlifting. This balanced approach helps him stay fit without putting undue strain on his joints and muscles.
Importance of Flexibility and Mobility
In recent years, Selleck has emphasized the importance of flexibility and mobility in his fitness regimen. Understanding the natural decline in muscle mass and joint flexibility with age. he includes stretching and yoga in his routine. These practices help prevent injuries, improve posture, and maintain mobilit
Explore natural remedies for syphilis treatment in Singapore. Discover alternative therapies, herbal remedies, and lifestyle changes that may complement conventional treatments. Learn about holistic approaches to managing syphilis symptoms and supporting overall health.
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.
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.
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.
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.
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.