Dr. Deepa Shivnani presented on Meniere's disease. Some key points:
1. Meniere's disease is a disorder of the inner ear associated with episodic vertigo, fluctuating hearing loss, tinnitus, and aural fullness.
2. The cause is thought to be endolymphatic hydrops (excess fluid buildup) in the inner ear due to issues with fluid regulation.
3. Treatment involves managing acute vertigo attacks medically and lifestyle modifications like a low-salt diet. More advanced cases may involve intratympanic injections or ablative surgeries of the inner ear.
This is a presentation I used for my seminar on 'Phonosurgery' on 4th November, 2015. I hope they are useful to you. Constructive as well as Destructive criticism welcomed.
This is a presentation I used for my seminar on 'Phonosurgery' on 4th November, 2015. I hope they are useful to you. Constructive as well as Destructive criticism welcomed.
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 .
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 .
Meniere’s Disease – An Overview of the Disease and Its Homeopathic Management.Welcome Cure LLP
Meniere’s disease is a common disorder of inner ear that affects hearing and balance of an individual marked by dizziness, ringing in the ears & hearing loss. It is one of the most common causes of vertigo, affecting approximately 0.2 – 4 % of the world population. It doesn’t affect an individual only physically; but even shows its impact on his job, relationships, and social activities. Homeopathy works wonderfully in Meniere’s disease by alleviating the symptoms and eradicating the disease permanently. You can find more of such informative Power Point Presentations as well as other useful health information at www.welcomecure.com, the definitive online homeopathic treatment portal
www.welcomecure.com
Please find the power point on Meniere's disease. I tried to present it on understandable way and all the contents are reviewed by experts and from very reliable references. Thank you
an inner ear disorder that cause episodes of vertigo
(spining) . this sildeshare contained detailed information about definition, causes, types, medical and nursing management.
A concise presentation about BPPV and Ménière's disease and other causes of vertigo, the difference between central and peripheral vertigo, symptoms and etiology and approach to physical examination and treatment.
Hirchsprung’s disease by Dr Afuye Olubunmi OlusolaAlade Olubunmi
In Hirchsprung's disease, Absence of ganglion cells in the myenteric and submucosal plexus
Upstream bowel becomes dilated secondary to functional obstruction.
The prostate is an exocrine gland of the male mammalian reproductive system
It is a walnut-sized gland that forms part of the male reproductive system and is located in front of the rectum and just below the urinary bladder
Function is to store and secrete a clear, slightly alkaline fluid that constitutes 10-30% of the volume of the seminal fluid that along with the spermatozoa, constitutes semen
A healthy human prostate measures (4cm-vertical, by 3cm-horizontal, 2cm ant-post ).
It surrounds the urethra just below the urinary bladder. It has anterior, median, posterior and two lateral lobes
It’s work is regulated by androgens which are responsible for male sex characteristics
Generalised disease of the prostate due to hormonal derangement which leads to non malignant enlargement of the gland (increase in the number of epithelial cells and stromal tissue)to cause compression of the urethra leading to symptoms (LUTS
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Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
Couples presenting to the infertility clinic- Do they really have infertility...Sujoy Dasgupta
Dr Sujoy Dasgupta presented the study on "Couples presenting to the infertility clinic- Do they really have infertility? – The unexplored stories of non-consummation" in the 13th Congress of the Asia Pacific Initiative on Reproduction (ASPIRE 2024) at Manila on 24 May, 2024.
These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
Pulmonary Thromboembolism - etilogy, types, medical- Surgical and nursing man...VarunMahajani
Disruption of blood supply to lung alveoli due to blockage of one or more pulmonary blood vessels is called as Pulmonary thromboembolism. In this presentation we will discuss its causes, types and its management in depth.
micro teaching on communication m.sc nursing.pdfAnurag Sharma
Microteaching is a unique model of practice teaching. It is a viable instrument for the. desired change in the teaching behavior or the behavior potential which, in specified types of real. classroom situations, tends to facilitate the achievement of specified types of objectives.
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.
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
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2. Where do we stand?
1.150 years have passed since this syndrome
was described
2.Amount of literature has virtually doubled
3.cause is multifactorial
4.Not all individuals with histological features of
Meniere’s disease manifested the classic
clinical features
3. Introduction : History
• First described by
Prosper Meniere in
1861.
• In 1902, Parry
performed a CN VIII
division for vertigo in a
patient with suspected
Meniere’s disease.
• Portman did
endolymphatic sac
decompression via a
transmastoid approach
in 1926.
• In 1931,McKenzie
performed a selective
vestibular neurectomy.
4. Introduction
• Meniere's disease (idiopathic endolymphatic
hydrops) is a disorder of the inner ear
associated with a symptoms consisting of
• spontaneous, episodic attacks of vertigo;
• sensori neural hearing loss which usually
fluctuates
• tinnitus
• sensation of aural fullness.
5. INCIDENCE
Roughly 1 in 1000 individuals are affected
Constitutes 10% of all patients attending vertigo
clinic
Female preponderance
Rare in children under the age of 10
Commonly begins between 3th to 6th decades of
life
Bilateral Meniere’s syndrome is seen in 5% of
these patients
8. LERMOYEZ SYNDROME
• This is a variant of Meniere’s disease. It is
characterized by sudden sensori neural
hearing loss which improves during or
immediately after the attack of vertigo.
9. TUMARKIN’S DROP ATTACKS
• abrupt falling attacks of brief duration without
loss of consciousness. due to excess
endolymphatic volume. Utricular crisis is used
to indicate this condition.
• In the later disease stages the valve of Bast
remaining patent may cause sudden drainage of
endolymph from the utricle due to longitudinal
flow resulting in these drop attacks
10. • Several pathophysiological mechanisms are
thought to be implicated in the otolithic
catastrophe of Tumarkin:
• sudden shift of the utricular macula, sudden
changes in the endolymphatic fluid pressure, and
sudden electrolyte changes secondary to the
rupture of the membrane labyrinth.
• Thus, the inappropriate stimulation of the
otolithic organs might generate a failure of the
vestibulospinal reflex with the loss of postural
tonus and, consequently, the falling
21. PATHOLOGY
A. Defective absorption by endolymphatic sac-
• Poor vascularity of sac
• Less absorptive tubular epithelium
• increased peri saccular fibrosis
B. Rupture of reissner’s membreane leading to
mixing of perilymph & endolymph- Schuknecht
• allow leakage of the potassium-rich endolymph
into the perilymph, bathing the eighth cranial
nerve and lateral sides of the hair cells
22.
23. Histopathological changes
• Loss of shorter stereocilia of outer hair cell
first occuring in the apical region
• Outer hair cell->inner hair cell->intercellular
edema b/w marginal cell->vacuolization-
>atrophy of marginal and intermediate cells->
loss of spiral ganglion cell
24. • High concentrations of extracellular potassium
depolarize the nerve cells, causing their acute
inactivation.
• The result is a decrease in auditory and vestibular
neuronal outflow consistent with the hearing loss
and features of acute vestibular paralysis seen in
a typical Meniere's attack
• The chronic deterioration in inner ear function
presumably is the effect of repeated exposure to
the effects of the potassium
26. HEARING LOSS
1. Sensori neural in nature
2. Fluctuating and progressive
3. Affects low frequencies
4. Mild low frequency conductive
hearing loss (rare)
5. Profound sensori neural hearing
loss (End stage)
27. TINNITUS
Roaring in nature
subjective
Could be continuous / intermittent
Non pulsatile in nature
Frequency of tinnitus corresponds to the region of
cochlea which has suffered the maximum damage
29. Investigations
• Tuning forks tests :
SNHL
• PTA
• Speech audiometry
• Recruitment test +ve
• SISI >70%
• Tone decay <20 dB
30. Investigations
• Caloric testing – canal paresis
• ENG
• Head Thurst test
• ECoG – SP is larger & more negative
• SP/AP ratio increases > 30%
• Dehydration/Glycerol test
• VEMP (Vestibular evoked myogenic potentials)
elevated threshold
31. Spontaneous nystagmus
• The direction of the observed spontaneous
nystagmus varies; it can consistently beat
toward the
• involved ear (irritative),
• away from it (paralytic), or
• change from an irritative to a paralytic
pattern over time, and thus cannot be used to
lateralize the disease.
32. LOUDNESS RECRUITMENT
1. This is abnormal growth in the perceived
intensity of sound
2. This is usually positive in patients with
Meniere’s disease
3. ABLB (alternate binaural loudness balance
test)is the test used to look for the presence
of recruitment
4. This test is really time consuming
33. ELECTRO COCHLEOGRAPHY
1. Increased summating potential / action
potential ratio. 1:3 is normal
2. Widened summating potential / action
potential complex. A widening of greater
than 2 ms is significant
34. VESTIBULAR TESTS
1. Not mandatory for diagnosis of Meniere’s
disease
2. Caloric test is still performed
3. It is low frequency stimulation (0.003 Hz) of
lateral canal
4. Caloric asymmetry will point to the diseased
ear
5. 20% difference between the two ears
(Jongkee’s formula) is significant
35. VEMP
1. Vestibular evoked myogenic potential
2. Measures the relaxation of sternomastoid muscle in response
to ipsilateral click stimulus
3. Brief high intensity ipsilateral clicks produce large short latency
inhibitory potentials (VEMP) in the toncially contracted
Ipsilateral sternomastoid muscle
4. This test is due to the presence of vestibulo collic reflex
5. Afferent arises from sound responsive cells in the saccule,
conducted via the inferior vestibular nerve.
6. Efferent is via vestibulo spinal tract
7. Normal responses are composed of biphasic (positive-negative)
waves
8. VEMP reveals saccular dysfunction
37. DEHYDRATION TESTS
1.Glycerol
2.Frusemide
3.Isosorbide
• the test is considered positive if
• (1) there isa 10-dB or more improvement in
pure tone thresholds at 2 or more frequencies
(250 to 2000 Hz), or
• (2) there is a 12% or greater improvement in
speech discrimination score.
38. GLYCEROL TEST
1. First introduced by Klockhoff and Lindblom – 1966
2. Glycerol is administered in doses of 1.5 mg/kg body wt in
empty stomach
3. Serum osmolality should increase at least by 10 mos/kg
4. Side effects include Headache, Nausea, vomiting,
drowsiness
5. PTA is performed 2-3 hours after administration
6. False positivity is rare
7. Positivity depends on the phase of the disease
39. Management
• Conservative treatments include lifestyle and
dietary adjustments,diuretics, and
supplemental use of vestibular suppressants.
• Invasive or destructive procedures are
indicated only in the 5% to 10% of patients
with Meniere’s disease who fail conservative
and medical measures.
• Overall, vertigo control is achieved in more
than 99% of patients with Meniere’s disease.
43. TREATMENT OF ACUTE
EXACERBATION
1. Intravenous fluids – dehydration
2. Vestibular suppressants – May delay
recovery / rehabilitation process
3. Corticosteroids – May help if tinnitus and
deafness are debilitating
44. LOW SALT DIET
1. Frustenberg diet
2. 2 grams / 24 hours (restricted salt
intake)
3. Life style modification
45. ROLE OF DIURETICS
1. Diuretics play a vital role in alleviating acute
symptoms
2. This has been in use since 1930’s
3. Thiazide group of drugs are commonly used
4. Frusemide may be used to alleviate acute
symptoms
5. Clear scientific evidence is lacking regarding the
usefulness of diuretics
46. BETAHISTINE
1. Cochlear vascular insufficiency has been proposed as
one of the mechanism of Meniere's disease
2. Betahistine is supposed to cause vasodilatation of
cochlear blood vessels
3. Betahistine has weak H1 agonistic property and
considerable H3 antagonist properties
4. It reduces the frequency & intensity of vertigo. Has
minimal effect on tinnitus
5. Doesn’t help much with hearing loss
47. INTRATYMPANIC STEROIDS
1. Immune modulating effects
2. Improves fluid dynamics of inner ear due to
mineralocorticoid effects
3. Vertigo was controlled on an immediate basis
4. Methylprednisolone has the best effect as it
penetrates the round window better
5. Silverstein microwick can be used for
intratympanic drug administration
48. OTHER TREATMENT
MODALITIES (ANCILLARY)
1. Stress reduction
2. Patient education
3. Hearing aids – can be used to suppress
troublesome tinnitus
4. Tinnitus retraining
49.
50.
51.
52. VIBRATOR THERAPY
1. Meniett Device
2. Low pressure pulse generator
3. Vibrations are transmitted via
external auditory canal
4. Vibrations alter inner ear fluid
dynamics by their effects on the oval
and round windows
5. Exact mechanism of action is not
known
6. It is totally non invasive
7. This device is portable
53. VIBRATOR THERAPY STEPS
1. Diagnosis should be confirmed
2. Ventilation tube should be inserted
3. Patient should be trained for self
administration of the treatment
4. Usually administered thrice a day about 5
mins each time
5. Treatment lasts for 5 weeks
54. INDICATIONS FOR VIBRATOR
THERAPY
1. Classic unilateral Meniere’s disease
2. Intense vestibular / cochlear symptoms
3. Failed medical therapy
4. Over 65 years of age
5. Imbalance / aural fullness / tinnitus after
gentamycin treatment
56. ROLE OF AMINOGLYCOSIDES
1.Vestibulotoxic effects are put to therapeutic
use.
2.Sensation of vertigo reduced while hearing
is preserved
3.Streptomycin / gentamycin are
predominantly Vestibulotoxic
4.Intratympanic administration is preferred
57. INTRATYMPANIC GENTAMYCIN
1. Fixed dose protocol is used
2. 40 mg/ml gentamycin is buffered with soda bicarb (pH6.4) final
concentration 26.7mg/ml.
3. T tube grommet inserted into the postero inferior quadrant of ear
drum. A mcirocatheter is inserted through the grommet
4. 1ml of gentamycin solution is injected into the middle ear cavity via
the microcatheter
5. Three injections are given per day in outpatient setting
6. Injections are given for 4 days
7. After injection patient should lie supine with the infiltrated ear up
for 30 mins
8. Vertigo usually develops between 2-4 days after cessation of
treatment
59. Endolymphatic Sac Surgery
– Decompression:
Removal of bone overlying the sac
– Shunting:
Placement of synthetic shunt to drain endolymph
into mastoid
– Drainage:
Incision of the sac to allow drainage
– Removal of sac:
Excision of the sac
61. SHUNT PROCEDURE
1. External shunts – Drains the sac into mastoid
cavity / subarachnoid space
2. Internal shunts – Drains excessive endolymph
into the perilymphatic space
(cochleosacculotomy / labyrinthotomy)
62.
63. COCHLEOSACCULOTOMY /
LABYRINTHOTOMY
1. Helpful in treating debilitated patients
2. Involves disruption of osseous spiral lamina
3. Angular pick introduced via round window
towards oval window. It will accommodate 3
mm long pick
4. After perforation the pick is withdrawn and
the round window is sealed by fat