5.4 Special Senses: Ophthalmologic & Otolaryngologic Emergencies
Key Takeaways
- Acute Angle-Closure Glaucoma presents with severe ocular pain, mid-dilated non-reactive pupil, corneal clouding, and intraocular pressure exceeding 30 mmHg, requiring medical pressure lowering and laser peripheral iridotomy.
- Central Retinal Artery Occlusion presents as sudden, painless monocular vision loss with a cherry-red spot at the macula surrounded by pale retina, treated urgently with ocular massage and intra-arterial thrombolysis within 4.5 hours.
- Retinal detachment manifests with flashing lights (photopsia), floaters, and a curtain coming down over the visual field, requiring emergency laser photocoagulation or retinopexy.
- Malignant Otitis Externa is a life-threatening Pseudomonas aeruginosa skull base infection in elderly diabetics, presenting with granulation tissue at the external ear canal floor and requiring 6-8 weeks of IV antipseudomonal therapy.
- Peritonsillar abscess presents with severe unilateral sore throat, trismus, muffled 'hot potato' voice, and contralateral uvular deviation, managed definitively with needle aspiration or incision and drainage.
Ocular Emergencies & Acute Painless Vision Loss
Ophthalmologic emergencies require immediate evaluation to prevent permanent blindness. Prompt differentiation between anterior segment pressure crises, orbital infections, and retinal vascular occlusions guides targeted therapy.
Acute Angle-Closure Glaucoma (AACG)
AACG occurs due to occlusion of the trabecular meshwork by the peripheral iris, abruptly obstructing aqueous humor drainage from the anterior chamber. Symptoms are typically triggered by pupillary dilation (e.g., entering a dark movie theater or administration of mydriatic eye drops).
- Clinical Presentation: Sudden onset of excruciating deep ocular pain, ipsilateral headache, blurred vision, colored halos around lights, nausea, and vomiting.
- Physical Exam Findings: Conjunctival injection, corneal edema ("steamy" or hazy cornea), and a fixed, mid-dilated pupil unreactive to light. Palpation of the globe reveals a rigid, "rock-hard" eye.
- Diagnostic Threshold: Tonometry reveals an intraocular pressure (IOP) markedly elevated above 30 mmHg (often 40–90 mmHg; normal range is 10–21 mmHg).
- Emergency Management Protocol:
- Topical Beta-Blocker: Timolol 0.5% (decreases aqueous humor production)
- Topical Alpha-2 Agonist: Apraclonidine 1% (decreases aqueous production)
- Topical Cholinergic: Pilocarpine 2% (induces miosis to pull iris away from trabecular meshwork; applied once IOP drops <40 mmHg)
- Systemic Agents: Intravenous acetazolamide (500 mg IV) or IV mannitol
- Definitive Treatment: Laser Peripheral Iridotomy (LPI) performed bilaterally (prophylactically treating the contralateral eye).
Orbital Cellulitis vs. Preseptal Cellulitis
| Feature | Preseptal (Periorbital) Cellulitis | Orbital Cellulitis |
|---|---|---|
| Anatomical Site | Infection anterior to orbital septum | Infection posterior to orbital septum (often ethmoid sinusitis complication) |
| Eyelid Erythema & Edema | Present | Present |
| Pain with Eye Movement | Absent | Present (hallmark finding) |
| Proptosis & Ophthalmoplegia | Absent | Present |
| Visual Acuity Impairment | Absent | Present (requires emergency intervention) |
| Management | Outpatient oral antibiotics (Amoxicillin-clavulanate) | Inpatient IV broad-spectrum antibiotics (Vancomycin + Ceftriaxone) + orbital CT |
Acute Painless Monocular Vision Loss
[ Acute Painless Monocular Vision Loss ]
|
(Fundoscopic Examination)
|
+----------------------------------------+----------------------------------------+
| | |
[ Central Retinal Artery ] [ Central Retinal Vein ] [ Retinal Detachment ]
[ Occlusion (CRAO) ] [ Occlusion (CRVO) ] [ ]
| | |
(Cherry-red spot, pale ("Blood and thunder", (Photopsia, floaters,
retina; ocular massage, hemorrhages, dilated "curtain coming down",
intra-arterial rtPA) veins, anti-VEGF tx) laser photocoagulation)
Retinal Vascular & Structural Conditions
- Central Retinal Artery Occlusion (CRAO): Caused by thromboembolism (carotid artery atherosclerosis or cardiac emboli). Fundoscopy demonstrates a pale, edematous retina with a prominent "cherry-red spot" at the macula (due to preserved choroidal blood flow visible through the thin fovea). Management involves emergency ophthalmologic consultation, ocular massage, anterior chamber paracentesis, IV mannitol, and consideration of intra-arterial thrombolysis within 4.5 hours.
- Central Retinal Vein Occlusion (CRVO): Caused by retinal vein thrombosis. Fundoscopy reveals a dramatic "blood and thunder" appearance with widespread retinal hemorrhages, dilated tortuous veins, cotton-wool spots, and optic disc edema. Managed with intravitreal anti-VEGF injections (ranibizumab, aflibercept).
- Retinal Detachment: Caused by a rhegmatogenous retinal tear allowing fluid accumulation in the subretinal space. Patients report photopsia (flashing lights), a sudden shower of floaters, and a dark "curtain or shade drawn over the visual field." Fundoscopy displays an elevated, gray, wrinkled retina. Emergency management includes laser photocoagulation, cryopexy, or pneumatic retinopexy.
Otolaryngologic Emergencies & Deep Neck Infections
Malignant (Necrotizing) Otitis Externa
Malignant otitis externa is a aggressive, life-threatening infection of the external auditory canal that invades soft tissue and the temporal bone (osteomyelitis).
- Microbiology: Pseudomonas aeruginosa (>90% of cases).
- High-Risk Population: Elderly patients with uncontrolled diabetes mellitus or immunocompromised states.
- Clinical Presentation: Severe, unremitting otalgia (worsening at night and with chewing), purulent otorrhea, and granulation tissue at the floor of the external auditory canal at the bony-cartilaginous junction. Cranial nerve involvement indicates skull base extension (CN VII facial palsy is most common).
- Diagnosis & Treatment: Computed tomography (CT) or magnetic resonance imaging (MRI) of the temporal bone demonstrates bone erosion. Treatment requires 6 to 8 weeks of IV antipseudomonal therapy (e.g., IV ciprofloxacin 400 mg every 8 hours, cefepime, or piperacillin-tazobactam).
Deep Neck Space Abscesses
- Peritonsillar Abscess (Quinsy): Complication of acute tonsillitis. Clinical manifestations include severe unilateral sore throat, fever, dysphagia, trismus (inability to open mouth due to internal pterygoid muscle spasm), a muffled "hot potato" voice, and uvular deviation to the contralateral side. Management requires prompt needle aspiration or incision and drainage (I&D) alongside IV antibiotics (ampicillin-sulbactam or clindamycin).
- Retropharyngeal Abscess: Infection in the space between the pharyngeal mucosa and prevertebral fascia, primarily occurring in young children (<5 years). Presentation includes fever, neck pain with extension, odynophagia, stridor, and anterior bulging of the posterior pharyngeal wall. Lateral neck radiograph shows widening of the prevertebral soft tissue space (>7 mm at C2; >14 mm at C6). Treated with IV antibiotics and surgical drainage.
Sudden Hearing Loss & Epistaxis Management
- Sudden Sensorineural Hearing Loss (SSHL): Defined as sensorineural hearing loss of ≥30 dB across 3 consecutive frequencies developing within 72 hours. Tuning fork testing reveals Weber lateralizing to the unaffected ear and Rinne positive bilaterally (AC > BC). Emergency treatment includes high-dose oral corticosteroids (prednisone 60 mg daily for 14 days) or intratympanic steroid injections, followed by MRI of the brain and internal auditory canal to rule out vestibular schwannoma (acoustic neuroma).
- Epistaxis Control:
- Anterior Epistaxis (90%): Originates from Kiesselbach's plexus (Little's area). Managed with direct compression for 10–15 minutes while leaning forward, topical vasoconstrictors (oxymetazoline), or chemical cautery with silver nitrate.
- Posterior Epistaxis (10%): Originates from the sphenopalatine artery. Presents as profuse bleeding down the posterior pharynx resistant to anterior compression. Requires posterior nasal balloon packing, hospital admission, and endoscopic arterial ligation if bleeding persists.
A 67-year-old female presents to the emergency department with sudden, severe pain in her right eye, accompanied by a right-sided headache, blurred vision, and nausea. She states the symptoms began while she was sitting in a darkened movie theater. On examination, her right eye exhibits conjunctival hyperemia, a hazy cornea, and a mid-dilated pupil that is unreactive to light. Palpation of the right globe reveals a firm, rigid structure. Measurement of intraocular pressure (IOP) in the right eye is 52 mmHg. What is the definitive treatment for this condition?
An 81-year-old male with a 25-year history of poorly controlled type 2 diabetes mellitus presents with a 3-week history of worsening right ear pain and foul-smelling otorrhea. The pain is severe, deep-seated, and worsens at night. He has been using topical ciprofloxacin ear drops prescribed by his primary care physician without relief. Physical examination reveals purulent discharge and pink granulation tissue at the floor of the right external auditory canal at the bony-cartilaginous junction. The right facial nerve demonstrates weakness on eye closure and smile (CN VII palsy). What is the most appropriate next step in management?
A 28-year-old male presents with a 4-day history of severe left-sided sore throat, difficulty swallowing, and fever. On examination, he speaks with a muffled 'hot potato' voice and has trismus, limiting his ability to open his mouth wider than 2 cm. Oropharyngeal exam reveals left tonsillar swelling, anterior pillar erythema, and displacement of the uvula to the right side. What is the primary definitive management for this patient?