Acute Otitis Media and Tinnitus

List the causes of Acute Otitis Media (AOM), including nasopharyngeal pathologies, predisposing factors, and Eustachian tube dysfunction etiologies.

Nasopharyngeal pathologies causing pre-existing effusion include Angiofibroma (in adolescents) and Nasopharyngeal carcinoma (in older men, especially with white hair).

Predisposing factors include adenoids, post-nasal packing, cleft palate, and nasal allergy.

Eustachian tube dysfunction causes include faulty lactation technique (laying a child flat during feeding causes milk regurgitation through the tube),
GERD (ascending acid reaches the middle ear), and
cold viruses (inducing tube closure).

Differentiate the visual/otoscopic appearance of Acute Otitis Media, Otitis Media with Effusion, and Furunculosis, and describe the three routes of infection spread to the middle ear.

Acute Otitis Media shows cheesy pus behind the tympanic membrane
(due to bacterial superinfection of trapped fluid),
while
Otitis Media with Effusion shows clear fluid with an air-fluid level and visible bubbles (due to Sterile transudate/mucus from Eustachian Tube dysfunction alone).

Furunculosis is infection localized to the external auditory canal.

The three infection routes are: the Eustachian tube (most common), a perforated tympanic membrane (exposing the middle ear to external canal organisms), and hematogenous spread (very rare, mostly in immunocompromised patients like uncontrolled diabetics, HIV, or renal failure patients).

Describe the bacterial and viral pathogens causing AOM, and explain how viral infection leads to suppuration.

Bacterial pathogens include β-hemolytic streptococci (most common), Streptococcus pneumoniae, and Haemophilus influenzae (highly associated with recurrent flu).
Viral pathogens include Influenza virus, Adenovirus, and Measles.
Viruses do not directly cause suppurative infection; instead, they create an environment favorable for a superadded bacterial infection, resulting in acute suppurative otitis media.

Describe the five pathological stages of AOM progression.

1) Acute Catarrhal Stage: Eustachian tube occlusion (usually viral) causes negative middle ear pressure;
2) Acute Exudative Stage: negative pressure causes blood vessels to ooze fluid;
3) Acute Suppurative Stage: ascending infection turns exudate into pus trapped under tension;
4) Resolution Stage: occurs with effective medical treatment;
5) Perforation Stage: occurs if untreated, as pus pierces the eardrum to exit.

Compare the clinical manifestations of AOM before versus after tympanic membrane perforation.

Before perforation:
severe otalgia (pus under high tension),
absent otorrhea (intact TM), and
conductive hearing loss (fluid behind eardrum); signs progress from an injected TM with dilated vessels to bulging with a "Nippling sign" (localized bulging indicating pending perforation).

After perforation:
otalgia disappears (tension relieved),
otorrhea appears, and
conductive hearing loss persists but is less severe; fever also decreases.
Vertigo is absent in uncomplicated AOM throughout.

Describe the diagnostic approach, medical treatment, and surgical indications for AOM.

AOM diagnosis is purely clinical, based on complaint and physical exam; investigations like pure tone audiograms and tympanograms are unnecessary for uncomplicated cases.

Medical treatment includes antibiotics, antihistamines, nasal decongestants, and analgesics.

Initial management in otherwise healthy children can be observation with analgesia for 48 hours before starting antibiotics unless severe symptoms.

Surgical indications include: pending perforation/Nippling sign (requiring myringotomy to prevent poor healing),

Recurrent AOM (over 3 episodes/year with effusion, requiring myringotomy plus tube insertion),
Complicated AOM (requiring mastoidectomy for abscess), and Refractory disease (failed medical treatment).

List the three major complications of Acute Otitis Media.

1) Acute Labyrinthitis (post-otitic): presents with vertigo and sensorineural hearing loss, requiring massive medical treatment doses and usually resulting in residual hearing loss;
2) Acute Mastoiditis: can progress to a mastoid abscess requiring mastoidectomy;
3) Facial nerve palsy: a very rare complication.

Define Otitis Media with Effusion (OME), including its epidemiology, and describe the mechanism of fluid accumulation via Eustachian tube malfunction.

OME is non-suppurative middle ear fluid, primarily a disease of infants and young children, peaking between 6-24 months, with increased incidence in winter/spring;
it can be post-infectious (fluid persisting after AOM resolves) or
from barotrauma (air flight, scuba diving).

The key mechanism is Eustachian tube malfunction:
a closed tube causes middle ear gases to be absorbed, increasing negative intratympanic pressure and causing transudation of fluid; causative bacteria include Group A/B hemolytic streptococcus and Haemophilus influenzae.

Describe the four types of Middle Ear Effusion fluid, including their characteristics and most notable causes.

Serous Fluid: sterile, pale yellow, watery, translucent (like tap water); most famously caused by CSF leak via trauma/fistula.

Mucoid Fluid ("Glue Ear"): cloudy exudate from Secretory Otitis Media, common in children, caused by adenoids/allergy/cleft palate/tumors, treated with grommet tube insertion.

Purulent Fluid: found in Acute Suppurative Otitis Media.

Blood (Hemotympanum): results from failed Eustachian tube pressure equalization, triggered by non-pressurized aircraft travel, flying with a cold, or scuba diving.

Describe the otoscopic findings characteristic of Otitis Media with Effusion, including the tympanic membrane appearance and cone of light disturbance.

The tympanic membrane appears, amber-yellow, dull, and lacks luster/shine.
Findings include fluid behind the TM with an air-fluid level, air bubbles (which increase with Valsalva), and a retracted TM with an absent umbo. The cone of light is partially present but mostly disturbed, because the fluid changes the angulation between the anterior canal wall and the TM, altering the light reflection; pneumatic otoscopy shows limited membrane mobility (though not often performed).

Describe the mandatory investigation protocol for OME, including radiological evaluation and nasopharyngeal examination.

Unlike AOM, investigations are mandatory for OME. Nasal/nasopharyngeal examination is essential (may reveal adenoid enlargement) and no OME workup is complete without it.

Initial imaging is a plain lateral X-ray of the nasopharynx to visualize adenoids; advanced imaging (CT/MRI) evaluates for nasopharyngeal masses in older patients.

Describe the medical and surgical management of OME, including the two types of myringotomy tubes.

Medical management (initial, conservative) includes antibiotics (doubtful role if fluid is sterile), antihistamines,
corticosteroids,
nasal decongestants, and Eustachian tube ventilation exercises (Valsalva, gum chewing).

Surgical management (for refractory cases) involves myringotomy with ventilation tube insertion, plus adjunct adenoidectomy.

The Simple Myringotomy Tube stays in place up to 6 months (maximum 1 year),
while the T-tube is a permanent tube kept up to 5 years, reserved for cleft palate patients (whose Eustachian tube muscle defect prevents normal function).

Define Tinnitus, and differentiate Subjective from Objective Tinnitus, including epidemiology and related conditions like Pseudo-tinnitus.

Tinnitus is a symptom (never a specific disease), defined as perception of sound without an external stimulus.

Subjective Tinnitus is heard only by the patient, classically a non-vibratory whistling sound.

Objective Tinnitus is heard by both patient and examiner, classically vibratory, rhythmic, pulsatile, or clicking, from muscular or vascular causes.

About 70% of the general population and 35% of older adults report tinnitus, though only 25% seek medical advice.

Pseudo-tinnitus is malingering for secondary gain,
while Psychiatric Tinnitus involves true auditory hallucinations, classified under neuro-psychiatry rather than true tinnitus.

List the specific vascular, muscular, and hearing-loss-related causes of tinnitus.

Hyperdynamic Circulation causes pulsatile sound synchronized with heartbeat (worse at night), associated with anemia, hypertension, atherosclerosis, thyrotoxicosis, A-V shunts, and pregnancy.

Venous Vascular causes include dilated venous structures, sigmoid sinus dehiscence(the missing or thinning of the bony plate that normally covers the sigmoid venous sinus in the skull, leaving the blood vessel directly exposed to the mastoid air cells), and lateral sinus thrombus.

Muscular causes include
palatal myoclonus and
middle ear muscle myoclonus (vibratory, clicking sound).

Vascular Tumors (paragangliomas/glomus tumors) cause pulsatile tinnitus.

Conductive Hearing Loss causes (cerumen, AOM, effusion, CSOM, ossicular disruption) and Sensorineural Hearing Loss causes (congenital, tumors, acoustic neuroma, presbycusis) also contribute; unilateral tinnitus strongly suggests organic pathology requiring thorough workup.

Describe the clinical evaluation, investigations, and management approaches for tinnitus.

Evaluation includes history (duration, laterality, sound character — continuous suggests SNHL/CHL, rhythmic suggests vascular/muscular causes), general exam (for anemia, thyrotoxicosis, atherosclerosis), local ear exam, and neck exam (pressing the internal jugular vein; sound disappearing confirms venous etiology).

Baseline investigations include PTA and Tympanometry; imaging includes CT Petrous Bone (venous/bony defects like sigmoid sinus diverticulum), MRV (venous causes), and MRI with Gadolinium (arterial causes, retro-cochlear tumors).

Management is cause-specific:
cerumen removal, TM perforation sealing, treating infections, tranquilizers/muscle relaxants for myoclonus, tailored management for acoustic neuroma, and hearing aids/tinnitus maskers for presbycusis.