This document summarizes information about corneal ulcers. It discusses the anatomy of the cornea and common causes of corneal infections like bacteria, viruses, fungi and parasites. Corneal ulcers occur when there is damage to the corneal epithelium allowing infection to set in. Symptoms include pain, watering, photophobia and blurred vision. Signs include swelling, hypopyon in the anterior chamber. Management involves identifying the causative organism, using topical antibiotics and cycloplegics for uncomplicated cases. More severe cases may require debridement, bandage contact lenses or keratoplasty. Complications can include glaucoma, perforation and scarring.
Simple eye education for EHW, Ophthalmic eye student, school eye education & first - second year optometry students only .
common eye lid inflammatory conditions .
stye or hordeolum ( external / internal hordeolum ), lid abscess , chalazion or mebomian retention cyst, accessory lacrimal glands , lacrimal gland etc...
Simple eye education for EHW, Ophthalmic eye student, school eye education & first - second year optometry students only .
common eye lid inflammatory conditions .
stye or hordeolum ( external / internal hordeolum ), lid abscess , chalazion or mebomian retention cyst, accessory lacrimal glands , lacrimal gland etc...
to download this presentation from this link
https://mohmmed-ink.blogspot.com/2020/11/conjunctival-diseases-overview.html
over view for the conjunctival diseases. clinical presentation treatment .
This slide contains information regarding corneal ulcer and glaucoma. This can be helpful for proficiency level and bachelor level nursing students. Your feedback is highly appreciated.
orneal ulcer, also called keratitis, is an inflammatory or, more seriously, infective condition of the cornea involving disruption of its epithelial layer with involvement of the corneal stroma. It is a common condition in humans particularly in the tropics and in farming. In developing countries, children afflicted by vitamin A deficiency are at high risk for corneal ulcer and may become blind i
Superficial punctate keratitis by optometry fans site, definition of SPK, causes of superficial punctate keratitis, symptoms of superficial punctate keratitis, treatment of superficial punctate keratitis, management and treatment of SPK
Ethanol (CH3CH2OH), or beverage alcohol, is a two-carbon alcohol
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is the oldest recreational drug and likely contributes to more morbidity,
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disorder called alcohol use disorder (AUD), with mild, moderate,
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The four main behavioral effects of AUD are impaired control over
drinking, negative social consequences, risky use, and altered physiological
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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.
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
Ozempic: Preoperative Management of Patients on GLP-1 Receptor Agonists Saeid Safari
Preoperative Management of Patients on GLP-1 Receptor Agonists like Ozempic and Semiglutide
ASA GUIDELINE
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2 Case Reports of Gastric Ultrasound
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.
Prix Galien International 2024 Forum ProgramLevi Shapiro
June 20, 2024, Prix Galien International and Jerusalem Ethics Forum in ROME. Detailed agenda including panels:
- ADVANCES IN CARDIOLOGY: A NEW PARADIGM IS COMING
- WOMEN’S HEALTH: FERTILITY PRESERVATION
- WHAT’S NEW IN THE TREATMENT OF INFECTIOUS,
ONCOLOGICAL AND INFLAMMATORY SKIN DISEASES?
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- ETHICAL CHALLENGES IN LIFE SCIENCES
- Prix Galien International Awards Ceremony
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.
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.
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NVBDCP was launched in 2003-2004 . Vector-Borne Disease: Disease that results from an infection transmitted to humans and other animals by blood-feeding arthropods, such as mosquitoes, ticks, and fleas. Examples of vector-borne diseases include Dengue fever, West Nile Virus, Lyme disease, and malaria.
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
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7. Corneal ulcer
• Corneal ulcer may be defined as
discontinuation in normal epithelial
surface of cornea associated with
necrosis of the surrounding corneal
tissue.
• Pathologically it is characterised by
oedema and cellular infiltration
8. INFECTIVE KERATITIS
• BACTERIAL CORNEAL ULCER
• the cornea is exposed to atmosphere and
hence prone to get infected easily
• Cornea is protected from the minor infections
by the normal defence mechanisms present in
tears lysozyme, betalysin, and other protective
proteins.
9. Corneal ulcer
• either the local ocular defence mechanism is
jeopardized.
• there is some local ocular predisposing
disease.
• Host's immunity is compromised.
• The causative organism is very virulent.
10. Etiology
• Damage to corneal epithelium.
• Infection of the eroded area.
• Neisseria gonorrhoeae,
• Corynebacterium
• diphtheriae
• Neisseria meningitidis.
11. 1. Corneal epithelial damage
• Corneal abrasion due to small foreign body,
misdirected cilia, concretions and trivial trauma in
contact lens wearers or otherwise.
• Epithelial drying as in xerosis and exposure
keratitis.
• Necrosis of epithelium as in keratomalacia.
• Desquamation of epithelial cells as a result of
corneal oedema as in bullous keratopathy.
• Epithelial damage due to trophic changes as in
neuroparalytic keratitis.
12. corneal abrasion
• A corneal abrasion (scratched cornea or
scratched eye) is one of the most
common eye injuries. A scratched cornea often
causes significant discomfort, red eyes and
hypersensitivity to light. Corneal
abrasions result from a disruption or loss of
cells in the top layer of the cornea, called
the corneal epithelium.
18. From the ocular tissue.
• Anatomical continuity, diseases of
the conjunctiva readily spread to
corneal epithelium, those of sclera to
stroma, and of the uveal tract to the
endothelium of cornea.
20. 3. Causative organisms
• Common bacteria associated with corneal ulceration are:
• Staphylococcus aureus,
• Pseudomonas pyocyanea,
• Streptococcus
• Pneumoniae,
• E. coli,
• Proteus,
• Klebsiella,
• N. gonorrhoea,
• N. meningitidis
• C. diphtheriae.
21. Pathogenesis
• Once the damaged corneal epithelium is invaded by the
offending agents the sequence of pathological changes
which occur during development of corneal ulcer can
be described under four stages-
• infiltration,
• active ulceration,
• regression and
• cicatrization.
• The terminal course of corneal ulcer depends upon the
virulence of infecting agent, host defence mechanism
and the treatment received
24. Clinical picture
• In bacterial infections the outcome depends
upon the virulence of organism, its toxins and
enzymes, and the response of host tissue.
• Broadly bacterial corneal ulcers may manifest
as:
• i. Purulent corneal ulcer without hypopyon; or
• ii. Hypopyon corneal ulcer.
26. Symptoms
1. Pain and foreign body sensation occurs due to
mechanical effects of lids and chemical effects of
toxins on the exposed nerve endings.
2. Watering from the eye occurs due to reflex
hyperlacrimation.
3. Photophobia, i.e., intolerance to light results from
stimulation of nerve endings.
4. Blurred vision results from corneal haze.
5. Redness of eyes occurs due to congestion of
circumcorneal vessels.
27. Signs
1. Lids are swollen.
2. Marked blepharospasm
3. Conjunctiva is chemosed and shows conjunctival
hyperaemia and ciliary congestion.
4. Corneal ulcer
5. Anterior chamber may or may not show pus
(hypopyon).
6. Iris may be slightly muddy in colour
7. Pupil may be small due to associated toxin induced
iritis.
8. Intraocular pressure may some times be raised
30. Management
• Management of hypopyon corneal ulcer is
same as for other bacterial corneal ulcer.
Special points which need to be considered are
:
• Secondary glaucoma should be anticipated
and treated with 0.5% timolol maleate, B.I.D.
eye drops and oral acetazolamide.
• Source of infection, i.e., chronic dacryocystitis
if detected, should be treated by
dacryocystectomy
32. 1. Toxic iridocyclitis.
• It is usually associated with cases of
purulent corneal ulcer due to
absorption of toxins in the anterior
chamber.
33.
34. 2. Secondary glaucoma.
• It occurs due to fibrinous exudates
blocking the angle of anterior
chamber (inflammatory glaucoma).
35. 3. Descemetocele.
• Some ulcers caused by virulent organisms
extend rapidly up to Descemet's
membrane, which gives a great
resistance, but due to the effect of
intraocular pressure it herniates as a
transparent vesicle called the
descemetocele or keratocele.
36. 4. Perforation of corneal ulcer
• Sudden strain due to cough, sneeze or
spasm of orbicularis muscle may convert
impending perforation into actual
perforation
37. 5. Corneal scarring.
• It is the usual end result of healed corneal
ulcer. Corneal scarring leads to permanent
visual impairment ranging from slight blurring
to total blindness.
• Depending upon the clinical course of ulcer,
corneal scar noted may be nebula, macula,
leucoma, ectatic cicatrix or kerectasia,
adherent leucoma or anterior staphyloma.
38. Management of a case of corneal
ulcer
• [A] Clinical evaluation
• [B] Laboratory investigations
• [C] Treatment
39. [A] Clinical evaluation
• 1. Thorough history taking to elicit mode of
onset,
• 2. General physical examination
• Nourishment
• Anaemia
• Immunocompromising disease.
• 3. Ocular examination
• i. Diffuse light examination
• ii. Regurgitation test and syringing
• iii. Biomicroscopic examination
42. Microbiological investigations.
1. Gram and Giemsa stained smears for possible identification
of infecting organisms.
ii. 10 per cent KOH wet preparation for identification of
fungal hyphae.
iii. Calcofluor white (CFW) stain preparation is viewed under
fluorescence microscope for fungal filaments, the walls of
which appear bright apple green.
iv. Culture on blood agar medium for aerobic organisms.
v. Culture on Sabouraud's dextrose agar medium for fungi.
43. [C] Treatment
• I. Treatment of uncomplicated corneal ulcer
• II. Treatment of non-healing corneal ulcerof
uncomplicated corneal ulcer
• III. Treatment of impending perforation
• IV. Treatment of perforated corneal ulcer
44. I. Treatment of uncomplicated corneal
ulcer
• 1. Specific treatment for the cause.
• 2. Non-specific supportive therapy.
• 3. Physical and general measures.
45. 1. Specific treatment for the cause.
• Topical antibiotics. Initial therapy should be with
combination therapy to cover both gram-negative
and gram-positive organisms.
• Ciprofloxacin (0.3%) eye drops, or
• Ofloxacin (0.3%) eye drops, or
• Gatifloxacin (0.3%) eye drops.
• Systemic antibiotics are usually not required.
However, a cephalosporine and an
aminoglycoside or oral ciprofloxacin may be given
in perforation and when sclera is involved.
47. 2. Non-specific supportive therapy.
• (a) Cycloplegic drugs 1 percent atropine eye
ointment or drops should be used to reduce pain
from ciliary spasm and to prevent the formation
of posterior synechiae from secondary
iridocyclitis.
• (b) Systemic analgesics and anti-inflammatory
drugs such as paracetamol and ibuprofen relieve
the pain and decrease oedema
• (c) Vitamins (A, B-complex and C) help in early
healing of ulcer.
48. 3. Physical and general measures.
• (a) Hot fomentation. Local application of heat
(preferably dry) gives comfort, reduces pain
and causes vasodilatation.
• (b) Dark goggles may be used to prevent
photophobia.
• (c) Rest, good diet and fresh air may have a
soothing effect.
50. II. Treatment of non-healing corneal
ulcerof uncomplicated corneal ulcer
• 1. Removal of any known cause of non-healing
ulcer.
i. Local causes.
Ii. Systemic causes:
• 2. Mechanical debridement of ulcer
• 3. Cauterisation of the ulcer
• 4. Bandage soft contact lens
• 5. Peritomy
54. Treatment of perforated corneal ulcer
• Best is to prevent perforation. However, if
perforation has occurred, immediate measures
should be taken to restore the integrity of
perforated cornea.
• Depending upon the size of perforation and
availability, measures like use of tissue adhesive
glues, covering with conjunctival flap, use of
bandage soft contact lens or therapeutic
keratoplasty should be undertaken.
• Best is an urgent therapeutic keratoplasty.
57. VIRAL CORNEAL ULCERS
• HERPES SIMPLEX KERATITIS
• Ocular infections with herpes simplex virus
(HSV) are extremely common and constitute
herpetic keratoconjunctivitis and iritis.