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Diplopia After Head Trauma in a 14-Year-Old Boy

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1. Cranial Nerve Palsy (most common neurological cause)

CN IV - Trochlear Nerve Palsy (MOST common nerve injured in head trauma)

"The trochlear nerve is the most commonly injured cranial nerve in head trauma, probably because of its long course and thin caliber, making it susceptible to shear injury."

• Neuroanatomy through Clinical Cases, 3rd Ed.

• Causes vertical diplopia (one image appears above the other)
• The affected eye drifts slightly upward (hypertropia)
• Patient tilts their head to one side to compensate
• Diplopia worsens when looking downward and toward the nose (e.g., reading)
• Classic test: Bielschowsky three-step test

CN VI - Abducens Nerve Palsy

• Causes horizontal diplopia (side-by-side double vision)
• Affected eye cannot move outward (limited abduction)
• Diplopia is worst when looking toward the affected side
• The eye turns inward (esotropia)

CN III - Oculomotor Nerve Palsy

• Causes the eye to drift down and outward ("down and out" position)
• Associated with ptosis (drooping eyelid) and possible pupil dilation
• Complete CN III palsy = can't move eye up, down, or inward

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2. Orbital Blowout Fracture (very important in pediatric trauma!)

"Trapdoor fractures represent the most common type of orbital floor fracture in children (27%-93%)... Diplopia and severely restricted extraocular mobility are more common in children (44%-100%) than adults."

• Cummings Otolaryngology Head and Neck Surgery

• Pediatric bone is elastic, so the fracture snaps back and traps the inferior rectus muscle
• Periorbital swelling and bruising may be minimal or absent - the child looks normal externally
• Diplopia is on upward gaze (eye cannot look up because the muscle is trapped)
• Often accompanied by: nausea, vomiting, bradycardia (oculocardiac reflex)

This is a surgical emergency - delayed repair causes permanent muscle fibrosis!

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3. Other Causes to Exclude

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Summary: What is the most likely issue?

1. CN IV (trochlear) palsy - most likely if vertical diplopia, head tilt, worsens on downward gaze
2. Orbital trapdoor blowout fracture - most likely if limited upward gaze, minimal bruising, nausea/bradycardia present
3. CN VI palsy - most likely if horizontal diplopia, cannot look to one side

• CT scan of brain + orbits (to rule out intracranial bleed and orbital fracture)
• Full cranial nerve and neurological exam
• Pupil exam (to rule out CN III compression/aneurysm)
• Urgent ophthalmology + neurosurgery consult if fracture with entrapment is found

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Management of Post-Traumatic Diplopia in a 14-Year-Old

Step 1 - Immediate Assessment (Emergency Department)

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Management by Cause

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A. Cranial Nerve IV (Trochlear) Palsy - Most Common After Head Trauma

• Watchful waiting - most isolated traumatic trochlear palsies recover spontaneously over weeks to months
• Base-down prism (Fresnel stick-on prism applied to glasses) - relieves vertical diplopia in the meantime
• Eye patching of one eye for short-term relief

• Inferior oblique weakening surgery - realigns the eyes when palsy is permanent

"Spontaneous improvement occurs over a period of months in most patients. A base-down prism (conveniently applied to the patient's glasses as a stick-on Fresnel lens) may serve as a temporary measure. If the palsy does not resolve, the eyes can be realigned by weakening the inferior oblique muscle."

• Harrison's Principles of Internal Medicine 22E

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B. Cranial Nerve VI (Abducens) Palsy

• Eye patching / tape over one lens of glasses
• Fresnel prism on glasses
• Botulinum toxin injection to the medial rectus (prevents contracture in prolonged cases)

• Eye muscle surgery (lateral rectus resection / medial rectus recession) - can realign eyes in primary gaze

"Patching one eye, occluding one eyeglass lens with tape, or applying a temporary prism will provide relief of diplopia until the palsy resolves. If recovery is incomplete, eye muscle surgery nearly always can realign the eyes, at least in primary position."

• Harrison's Principles of Internal Medicine 22E

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C. Orbital Blowout Fracture with Muscle Entrapment - PEDIATRIC EMERGENCY

• Transconjunctival approach preferred (no external scar, lower risk of ectropion)
• Prolapsed orbital contents reduced
• Floor reconstructed with bone grafts, titanium mesh, or resorbable implants

"Trapdoor fractures are virtually always associated with entrapment, and rapid repair is indicated to prevent ischemic contraction and fibrosis of the inferior rectus and/or inferior oblique muscles, and consequent permanent motility restrictions."

• Cummings Otolaryngology Head and Neck Surgery

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D. Intracranial Pathology (Hemorrhage, Raised ICP)

• Neurosurgery referral immediately
• ICP management: head elevation, osmotherapy (mannitol/hypertonic saline)
• Surgical evacuation if significant hematoma or herniation signs

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General Principles for All Cases

1. Do not delay CT imaging in any child with head trauma + diplopia
2. Ophthalmology consult for all cases
3. Neurosurgery consult if intracranial pathology found
4. Monitor for worsening - new neurological signs, worsening headache, or altered consciousness = red flag for expanding bleed
5. Prism glasses for all nerve palsies during recovery phase
6. Follow up at 6-8 weeks - if palsy not improving, escalate workup

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Quick Summary Table

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Ozempic (Semaglutide) - Complete Drug Management

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Drug Overview

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Mechanism of Action

1. Stimulates glucose-dependent insulin secretion - beta cells release insulin only when blood glucose is elevated (low hypoglycemia risk as monotherapy)
2. Suppresses glucagon secretion in a glucose-dependent manner - reduces hepatic glucose output
3. Delays gastric emptying - slows postprandial glucose rise
4. Central appetite suppression - acts on hypothalamic POMC neurons to reduce hunger and caloric intake
5. Cardioprotective and renoprotective effects - exact mechanisms not fully established but include anti-inflammatory and endothelial effects

"Semaglutide reduces blood glucose through a mechanism where it stimulates insulin secretion and lowers glucagon secretion, both in a glucose-dependent manner." - FDA Prescribing Information, Jan 2025

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FDA-Approved Indications (2025)

1. Type 2 Diabetes Mellitus - adjunct to diet and exercise to improve glycemic control in adults
2. Cardiovascular risk reduction - reduces risk of major adverse cardiovascular events (MACE: CV death, non-fatal MI, non-fatal stroke) in adults with T2DM + established CVD
3. Chronic Kidney Disease protection - reduces risk of sustained eGFR decline, end-stage kidney disease, and CV death in adults with T2DM + CKD (new 2025 indication)

Note: Wegovy (higher-dose semaglutide 2.4 mg) is separately indicated for chronic weight management in adults with BMI ≥30 or ≥27 with a weight-related comorbidity.

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Dosing Schedule

Ozempic (Diabetes/CV/CKD)

• Inject subcutaneously in abdomen, thigh, or upper arm
• Can be given at any time of day, with or without food
• Rotate injection sites each week

Missed Dose Rule

• If missed: give as soon as possible within 5 days
• If >5 days have passed: skip and resume next scheduled day
• If ≥3 consecutive doses missed: consider dose reduction on restart

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Clinical Efficacy (Evidence Summary)

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Contraindications

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Warnings and Precautions

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Side Effects

Common (dose-dependent, usually improve with time)

• Nausea (most common - reason for slow titration)
• Vomiting
• Diarrhea
• Constipation
• Abdominal pain

Serious

• Acute pancreatitis
• Diabetic retinopathy complications
• Hypoglycemia (when combined with insulin/sulfonylureas)
• Allergic reactions (anaphylaxis, angioedema)
• Gallbladder disease (cholelithiasis) - weight loss accelerates gallstone formation

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Drug Interactions

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Special Populations

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Perioperative Management

• If minimal aspiration risk: can be continued preoperatively
• If decision to hold: semaglutide may be withheld before surgery due to delayed gastric emptying risk
• Compounded semaglutide is discouraged due to dosing errors and counterfeit/impurity concerns

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Monitoring Parameters

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Place in Type 2 DM Therapy (Harrison's 22E)

"GLP-1RAs and SGLT-2 inhibitors are increasing in use as evidence accumulates for CVD and CKD benefits, in addition to weight loss and glucose-lowering effects."

• Metformin remains the preferred first-line agent
• Semaglutide (GLP-1RA) is preferred add-on or first-line in patients with:
  • Established CVD or high CV risk
  • CKD
  • Obesity requiring weight loss
  • Intolerance to metformin

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Summary: Ozempic at a Glance

Class:        GLP-1 receptor agonist
Dose:         0.25 mg → 0.5 mg → 1 mg → 2 mg weekly (SC)
Key benefits: ↓ HbA1c, ↓ weight, ↓ MACE, ↓ CKD progression
Avoid in:     MTC/MEN2 history, hypersensitivity
Watch for:    Nausea, pancreatitis, retinopathy worsening, aspiration risk
Interactions: Oral drugs (absorption), insulin/SFU (hypoglycemia)
Pre-pregnancy: Stop 2 months before conception