Hippo ERcast April 2024

Intro: Cold Turkey Quitting the Spinal X-rays

Plain spinal x-rays miss too many clinically important injuries after trauma to remain a default test. In cervical spine trauma, NEXUS and the Canadian C-spine Rule help decide who needs imaging, but if imaging is indicated, CT usually answers the question far better than plain films. Trauma Spine Imaging Pearls C-spine imaging threshold: NEXUS and the Canadian C-spine Rule are validated tools for deciding whether cervical spine imaging is needed after trauma, but they do not choose the modality. Plain films miss injuries: Plain radiography detects only about 52% of clinically significant cervical spine injuries, versus roughly 98% for CT, making x-rays a poor choice when imaging is indicated. Ligamentous injury concern: Suspected cervical ligamentous injury is an MRI problem, not a flexion-extension x-ray problem, and isolated midline tenderness alone should not drive advanced imaging. Normal CT clears collar: A normal cervical spine CT is generally sufficient to clear the C-spine even in the obtunded blunt trauma patient, a nuance we walk through in the episode. Thoracolumbar imaging reality: There are no well-validated decision rules for thoracic and lumbar spine trauma, so imaging decisions hinge on risk factors, midline findings, deformity, and neurologic deficits. If imaging, choose CT: For clinically important thoracolumbar injuries, plain films have only about 30% to 60% sensitivity, while CT exceeds 90%, so x-rays rarely add useful certainty. Radiation Risk In Context Headline dose comparison: A 3-view cervical spine x-ray is about 0.4 mSv versus roughly 2.5 mSv for CT, but the superior diagnostic yield of CT often outweighs that difference. Meaningful risk benchmark: Radiation concern becomes more meaningful around cumulative exposures near 100 mSv, not from a single trauma CT in most older adults. Low-dose CT option: Low-dose spinal CT can drop exposure to around 1 mSv without losing much sensitivity for clinically significant injury, and we get into where that matters in the chapter. Shared decision framing: Radiation discussions should be individualized: repeated CTs in younger patients deserve more scrutiny than a one-time trauma scan in an older adult. Minor fracture significance: Small endplate or mild compression fractures often have little clinical consequence, which matters when weighing whether imaging will change management at all.

A Plastic Surgeon's Approach to Ear, Nose and Lip Lacs

Facial laceration repair is an anatomic problem, not just a skin-closure problem. Forehead, scalp, ear, nose, and lip wounds need layered closure, careful structure identification, and selective specialty consultation when fractures, nerve injury, or tissue loss are in play. Facial laceration repair principles Consultation red flags: Immediate plastics or ENT involvement is most justified for devastating injuries, facial fractures, and clear vascular or nerve injury; many other facial lacerations can be repaired safely in the ED. Irrigation and structure check: Copious irrigation is the first step because the real decision point is which structures are involved, not how long the skin cut looks. Layered closure strategy: For most facial wounds, multilayer closure is the key move because the deep dermal layer should carry the tension while the skin layer is mainly cosmetic. Running skin sutures: Running closure is often faster than interrupted sutures and can improve cosmesis by distributing tension evenly across the wound, a technique nuance we get into in the episode. Skin suture selection: Fast-absorbing gut works well for small low-tension facial wounds, while PROLENE remains a low-reactivity nonabsorbable option when follow-up for removal is reliable. Buried suture selection: MONOCRYL is the fastest-absorbing buried monofilament, while VICRYL is the workhorse for deeper tissue under tension, especially muscle and galea. Forehead and scalp lacerations Forehead closure framework: A linear forehead laceration usually needs buried 4-0 MONOCRYL to do the real work of closure, with the superficial layer chosen mainly for edge approximation and cosmesis. Deep forehead injuries: When a forehead wound exposes bone, look for fracture and convert to a 3-layer repair; the deepest muscular layer is commonly reapproximated with 3-0 VICRYL. Intracuticular skin option: A running intracuticular MONOCRYL closure is reserved for clean, undamaged skin edges where a buried cosmetic skin closure is feasible. We cover when that choice pays off on the show. Scalp hemostasis and exposure: Scalp lacerations bleed impressively, so cleaning away matted hair and securing hemostasis are prerequisite steps before judging depth or planning closure. Galea repair trigger: If the scalp wound reaches the galea or bone, repair the galea with 2-0 VICRYL before addressing the skin because deep support matters more than the outer closure. Staples and scalp aftercare: Staples are appropriate for most scalp wounds, though bald patients may be better served with chromic gut; keep the closure moist and avoid trapping hair in the repair.

Lit Matters 1: Is Phenobarb Better Than Benzos for Alcohol Withdrawal?

Alcohol withdrawal syndrome in the ED is still a benzodiazepine-first problem, but phenobarbital remains a credible alternative when CIWA drugs are scarce or dysautonomia dominates. Current ED-focused evidence suggests similar safety and disposition outcomes rather than clear superiority for either strategy. Phenobarbital vs Benzodiazepines in AWS Bottom-line equivalence signal: Meta-analyzed ED data did not show phenobarbital reducing ICU admission, hospital admission, ED return, or adverse events compared with benzodiazepines alone. Evidence quality limitations: Only eight studies met inclusion, with just two prospective RCTs, and bias plus confounding were substantial enough that utilization outcomes deserve cautious interpretation. Safety profile comparison: Across the pooled literature, no deaths were reported and nonfatal events like seizures, hypotension, and respiratory suppression were broadly similar between treatment groups. Sedative burden difference: Patients receiving any phenobarbital generally accumulated more total sedative-hypnotic exposure, about 30.7 lorazepam equivalents versus 10.7 with benzodiazepines alone. Phenobarbital practical niche: Phenobarbital is a reasonable ED option when benzodiazepines are limited, especially for prominent dysautonomia, and its long half-life and oral route matter in real practice. We get into where monotherapy fits in the episode.

How a Toxicologist Manages Calcium Channel Blocker Toxicity

Calcium channel blocker toxicity causes shock by collapsing vascular tone, myocardial contractility, or both. Bedside POCUS is central to separating vasodilatory from cardiogenic physiology, and early high-dose insulin can be lifesaving when the heart is hypodynamic. Calcium Channel Blocker Toxicity Loss of receptor selectivity: Massive calcium channel blocker overdose often blurs the usual dihydropyridine versus non-dihydropyridine pattern, so expect mixed vasodilatory and cardiogenic shock rather than a clean textbook phenotype. Shock phenotype by POCUS: Bedside cardiac ultrasound is the key early test because treatment hinges on whether the patient is hyperdynamic, hypodynamic, or mixed. We get into the ultrasound-based treatment split in the episode. Misleading initial presentation: Bradycardia, hypotension, hypoxia, and tachypnea can mimic MI, sepsis, or primary respiratory failure, making recent CCB starts or medication changes an important overdose red flag. Conservative fluid strategy: Hypotension in CCB toxicity is not primarily a volume problem, so fluids should be restrained; these patients also risk noncardiogenic pulmonary edema and accumulate large infusion volumes quickly. Calcium and pressor support: Early stabilization usually needs calcium plus hemodynamic support tailored to physiology, with norepinephrine for vasoconstriction and inotropes added when cardiac output is depressed. High-dose insulin role: High-dose insulin is the antidotal workhorse for a hypodynamic heart because it restores carbohydrate use and provides strong inotropy, even though bradycardia may improve only modestly. Intensive monitoring burden: HDI is a high-risk therapy that demands continuous hemodynamics, serial ECGs, frequent glucose checks, and repeated potassium monitoring. The practical monitoring cadence is worth hearing in the chapter.

Anaphylaxis Updates

Anaphylaxis is a rapid systemic hypersensitivity reaction that can be fatal even without hives or obvious airway findings. Severe disease, biphasic recurrence, and refractory anaphylaxis all change ED diagnosis, observation, and follow-up, with epinephrine remaining the treatment that matters most. Anaphylaxis Diagnosis and Risk Skin findings not required: Severe anaphylaxis can present with life-threatening respiratory or circulatory compromise without rash, wheeze, or shock, a pattern that drives under-recognition in the ED. Infant diagnostic criteria: Infants and toddlers lack dedicated anaphylaxis criteria, so NIAD/FAAN or WAO definitions are the practical framework when symptoms look nonspecific. We walk through the gray-zone presentations in the episode. Biphasic reaction framing: Biphasic anaphylaxis is recurrence after symptoms have fully resolved for at least 1 hour, without re-exposure, and higher initial severity makes that rebound more likely. Refractory disease signal: Refractory anaphylaxis persists despite appropriate epinephrine and symptom-directed care, a high-risk phenotype linked to increased fatality and the need for aggressive escalation. Unexpected trigger caution: A first-ever exposure to a new food or medication is an unlikely cause of anaphylaxis, a useful clue when the presumed trigger does not fit the story. Management, Observation, and Follow-up Epinephrine auto-injector dosing: For children under 15 kg, either the 0.1 mg or 0.15 mg IM epinephrine auto-injector is acceptable, reflecting the limited but practical pediatric guidance. Observation time principle: The more interventions required to stabilize an anaphylactic patient, the longer ED observation should be, especially when repeat epinephrine is needed. We get into the disposition nuance in the chapter. Acute tryptase timing: A tryptase level drawn as early as possible, ideally within 2 hours of symptom onset, can later help an allergist confirm that a true mast-cell event occurred. Baseline tryptase comparison: A second tryptase measured months later provides a baseline comparator, letting immunology interpret whether the acute value represented a significant rise. Discharge education essentials: High-risk patients should routinely leave with self-injectable epinephrine, technique teaching, and avoidance counseling, including that food anaphylaxis is usually triggered by ingestion rather than contact or inhalation.

Lit Matters 2: Under 8, Intubate?

A Glasgow Coma Scale below 8 is not a stand-alone indication for intubation in most toxic overdose patients. In acute poisoning, airway decisions hinge more on immediate threats like hypoxia, vomiting, shock, or seizures than on a single GCS cutoff. Airway Management in Toxic Overdose Myth of GCS 8: The classic “under 8, intubate” rule comes from traumatic brain injury, not routine overdose care, and applying it wholesale to poisoned patients overcalls the airway. Emergency intubation triggers: In acute poisoning, the red flags are seizure, persistent hypoxia, vomiting, or shock despite resuscitation rather than depressed consciousness alone. We walk through that bedside distinction in the episode. Randomized trial signal: A multicenter JAMA trial found that withholding routine intubation in comatose poisoned adults improved the composite outcome, with a win ratio of 1.85 over usual practice. Resource use reduction: Conservative airway management led to fewer ICU admissions and far less mechanical ventilation, with intubation rates dropping from 57.8% to 18.1% in the restricted group. Pneumonia risk shift: The study suggests intubation itself may contribute to aspiration-related harm, with pneumonia occurring in 6.9% of the conservative group versus 14.7% with routine practice. Important trial limits: Most patients were alcohol intoxications, no deaths occurred in either arm, and the unblinded design raises concern for a Hawthorne effect that may have inflated control-group intubation rates.

High Risk, Low Prevalence: Open Globe

Open globe injury is a vision-threatening full-thickness eye injury that is often missed when exam findings are subtle. Blunt orbital trauma is the most common mechanism, and a normal-appearing CT does not reliably exclude the diagnosis when suspicion remains high. Open Globe Recognition and Management Blunt trauma risk pattern: Blunt trauma is the leading mechanism for open globe injury, so any eye or facial strike from MVCs, fights, or sports should keep rupture on the differential even without dramatic external findings. Classic gross exam clues: Uveal prolapse, extruded orbital contents, a peaked teardrop pupil, hyphema, and a 360-degree subconjunctival hemorrhage are the named findings that should make you assume an open globe until proven otherwise. Bedside vision assessment: Visual acuity is a key prognostic marker, so document Snellen testing or fallback measures like counting fingers, motion, and light perception before transfer when feasible. We get into the charting priorities in the episode. RAPD and Seidel testing: A relative afferent pupillary defect raises concern for associated optic nerve injury and worse outcomes, while a Seidel test can help when the presentation is not obvious. Imaging limits and controversy: Non-contrast orbital CT with thin cuts can help find globe contour changes, foreign body, or fracture, but sensitivity is only 56-68%, and ocular ultrasound remains operator-dependent and controversial. Immediate protective steps: Avoid removing large foreign bodies, place a rigid eye shield, control nausea, and start broad-spectrum coverage such as vancomycin plus a third- or fourth-generation cephalosporin; the transfer and consultant nuances are worth hearing in the chapter.

Hypertensive Disorders of Pregnancy: Management

Preeclampsia and eclampsia are time-sensitive obstetric emergencies that occur during pregnancy and in the postpartum period, with maternal stroke risk rising when severe hypertension is not treated promptly. Emergency clinicians need fast recognition, seizure prophylaxis, and early OB involvement. Preeclampsia and Severe Hypertension Postpartum disease window: Hypertensive disorders of pregnancy can first present after delivery, so new postpartum headache, visual symptoms, or severe blood pressure should trigger a preeclampsia evaluation, a miss we emphasize in the episode. Severe pressure threshold: Sustained blood pressure at or above 160/110 mmHg marks severe disease and should prompt emergent OB/GYN consultation rather than watchful waiting or routine outpatient follow-up. Maternal stroke timeline: First-line antihypertensive treatment should ideally begin within 30 to 60 minutes of confirmed severe hypertension because delay increases the risk of maternal intracranial catastrophe. First-line antihypertensive options: Nifedipine, IV labetalol, and IV hydralazine are standard first-line agents, with oral nifedipine especially useful when IV access is delayed. Agent-specific cautions: Labetalol should be avoided in asthma, heart disease, or heart failure, while hydralazine is more prone to maternal hypotension, headache, palpitations, and nausea. Magnesium and Eclampsia Care Seizure prophylaxis cornerstone: Magnesium sulfate is the first-line therapy for seizure prophylaxis in preeclampsia and also the first- and second-line agent for active eclampsia. No-IV-access option: When IV access is not yet available, magnesium can be started intramuscularly with 5 grams in each gluteal muscle, a practical bridge in crashing patients. Toxicity bedside clues: Loss of deep tendon reflexes, respiratory depression, bradycardia, and pulmonary edema are classic warning signs of magnesium toxicity that demand immediate reassessment. Renal dosing caution: Renal insufficiency changes magnesium maintenance needs, and urine output becomes a key safety signal rather than a minor vital sign. We get into the adjustment logic in the chapter. Contraindication to magnesium: Myasthenia gravis is an absolute contraindication to magnesium, an exception worth recognizing early before reflexively starting standard preeclampsia treatment. Persistent seizure rescue: If eclamptic seizures continue after repeat magnesium, benzodiazepines such as midazolam or lorazepam are next rescue options, alongside airway control and oxygenation.

Lit Matters 3: Can We Sub hsTn for Conventional Troponin in the HEART Pathway?

High-sensitivity troponin changes emergency department chest pain risk stratification when paired with the HEART pathway. In a large multicenter cohort, hsTn identified more acute MI during the index visit, reduced 30-day missed MI, and was associated with fewer admissions and downstream stress tests. hsTn in the HEART Pathway Index MI detection: High-sensitivity troponin found more acute MI during the ED visit than conventional troponin, shifting diagnoses earlier rather than after discharge. Thirty-day miss reduction: The key signal was fewer AMI diagnoses in the following 30 days with hsTn, suggesting safer identification of truly low-risk chest pain patients. Resource use signal: Hospital admission fell from 15% to 12.2% and stress testing from 12.8% to 10.2% after switching to hsTn within the pathway, with implementation nuances we get into in the episode. Mortality unchanged: Thirty-day all-cause mortality did not differ between hsTn and conventional troponin pathways, supporting efficiency gains without an obvious mortality tradeoff. Complete HEART documentation: Patients with troponin testing but no fully documented HEART score had worse 30-day outcomes, a reminder that the pathway only works when the score is actually completed. Assay-specific cutpoint problem: High-sensitivity troponin is not a plug-and-play swap because absolute thresholds and delta changes depend on the specific assay. We walk through why local validation matters in the chapter.