Hippo ERcast April 2023

Intro: Kicking A** with Robbie O

Emergency medicine careers are shaped by recurring stress points on shift and the habits clinicians build outside the department. Deliberate performance skills, not just clinical knowledge, often determine how well physicians manage pressure, fatigue, and longevity in the ED. ED Performance and Career Stress Common ED stress points: Emergency physicians face predictable pressure around workload, uncertainty, and sustained cognitive strain, with practical patterns that become easier to recognize over the course of a career. On-shift performance tools: Small, repeatable tools can improve focus and decision-making during a busy shift, especially when stress starts to narrow attention. We get into the practical examples in the episode. Off-shift skill building: Career durability depends on what happens outside the hospital as much as what happens in it, including habits that support recovery, perspective, and continued growth. Stepping up your game: Professional growth in emergency medicine is usually less about dramatic reinvention and more about refining everyday behaviors that compound over time. Long-view ED development: A sustainable emergency medicine career requires attention to both immediate performance and the broader personal systems that keep clinicians effective over years of practice.

Priapism: Finding the "off switch"

Priapism is a sustained erection lasting more than 4 hours, and the emergency is distinguishing ischemic from non-ischemic disease. Ischemic priapism is a painful veno-occlusive compartment problem that threatens tissue viability, while non-ischemic priapism usually preserves flow and can often be worked up outpatient. Emergency Diagnosis of Priapism Four-hour time definition: Priapism is defined as a partial or full erection lasting more than 4 hours, a practical threshold that should trigger urgent ED evaluation rather than watchful waiting. Ischemic priapism pattern: Ischemic priapism is typically acutely painful with fully rigid corpora cavernosa, reflecting a veno-occlusive low-flow state that can quickly become a tissue-threatening emergency. Non-ischemic priapism pattern: Non-ischemic priapism is usually not acutely painful and causes only partial tumescence, with preserved arterial inflow that makes immediate invasive treatment less urgent. Aspirate and Doppler clues: Dark cavernosal blood, venous pH below 7.25, and little to no arterial flow on Doppler point to ischemia; bright red blood and preserved flow point the other way. We get into the bedside distinction in the episode. Recurrent ischemic priapism: Stuttering priapism causes recurrent painful erections with periods of detumescence and is classically linked to sickle cell disease, though leukemia and other hematologic disorders also matter. ED Management and Follow-Up Local anesthesia first: Initial treatment is performed under penile local anesthesia without epinephrine, typically using a dorsal penile block or circumferential ring block before decompression. Core detumescence strategy: Aspiration, saline irrigation, and intracavernosal phenylephrine are the standard first-line tools for ischemic priapism, aimed at relieving pressure and restoring outflow. Phenylephrine as vasoactive agent: Phenylephrine is the preferred alpha-adrenergic agent for intracavernosal injection, given in repeated small doses with close reassessment rather than a single one-and-done attempt. Needle approach basics: Corporal aspiration is typically done with a 16-18 gauge needle at the base of the shaft, avoiding the ventral surface where the urethra is at risk. We walk through the setup in the chapter. Thirty-six hour cutoff: AUA guidance advises against aspiration, irrigation, and phenylephrine once priapism has persisted beyond 36 hours, a key management boundary that changes the plan. Disposition and urology follow-up: After detumescence, patients may need admission for pain control or monitoring, and early urology follow-up within 24 to 48 hours is the usual next step.

Lit Matters 1: Intracranial hemorrhage in OHCA

Intracranial hemorrhage is an uncommon but high-stakes cause of non-traumatic out-of-hospital cardiac arrest after ROSC. In a systematic review of roughly 50,000 patients, ICH appeared in 4.3% overall and carried markedly worse outcomes, making post-arrest head CT a real diagnostic and prognostic decision. Head CT After ROSC Overall ICH prevalence: Systematic review data put intracranial hemorrhage at 4.3% of non-traumatic OHCA, enough to keep neurogenic arrest on the differential even when the post-ROSC workflow is pulling you toward ACS. Post-ROSC CT rationale: Early head CT can change both diagnosis and downstream treatment, especially before anticoagulation or thrombolytics, and that bedside pause about who should be scanned is worth hearing in the episode. Higher-risk clinical pattern: Female sex, a non-shockable rhythm, and no clear alternate cause clustered with higher ICH prevalence, although rhythm alone was not accurate enough to serve as a stand-alone predictor. Headache before collapse: Prodromal headache was a meaningful red flag for intracranial hemorrhage, but about half of patients had no reported symptoms before arrest, so absence of warning symptoms does not reassure. Prognostic weight of ICH: Neurologic causes of OHCA had devastating outcomes in the included data, with one study reporting 100% mortality versus 65% for non-neurologic causes, making CT useful for prognosis as well as cause-finding. Evidence limits and bias: The signal is clinically important, but the studies were heterogeneous and at risk of bias, so the take-home is to strongly consider head CT after ROSC rather than to scan every patient automatically.

You've got some Gall(stones)

Acute cholecystitis is an obstruction problem that evolves from gallbladder distention to ischemia, inflammation, and sometimes gangrene or perforation. In right upper quadrant pain, ultrasound is first-line, CT is selective rather than routine, and symptom duration meaningfully changes operative difficulty. Gallbladder pain and diagnosis Symptom duration signal: The surgeon cares how long the pain has been present because longer symptom duration usually means a harder operation and a more inflamed gallbladder, a practical distinction we get into in the episode. Biliary colic framing: Right upper quadrant pain with stones or sludge but no signs of cholecystitis or cholangitis is rarely an emergency, so other causes like peptic ulcer disease or pancreatic pathology still need attention. Exam and syndrome clues: Constant pain and a Murphy sign fit cholecystitis better than simple biliary colic, while jaundice points toward choledocholithiasis or cholangitis and epigastric pain radiating to the back suggests gallstone pancreatitis. Laboratory yield limits: No single lab rules out acute cholecystitis; WBC, CRP, and liver tests may rise, while lipase at three times normal supports gallstone pancreatitis rather than isolated gallbladder inflammation. Tokyo criteria anchor: The Tokyo Guidelines pair a local inflammatory sign with a systemic inflammatory marker, then require characteristic imaging for a definite diagnosis instead of relying on any one bedside finding. Imaging and surgical pitfalls Ultrasound first choice: Ultrasound is the preferred initial test because it detects stones and inflammation directly, with findings like wall thickening, pericholecystic fluid, sludge, and a sonographic Murphy sign. CT good not great: CT can suggest cholecystitis but does not replace ultrasound for stones or grading inflammation; it becomes more useful when you suspect gangrenous or emphysematous disease, obstruction, or pancreatitis. Equivocal study next steps: A HIDA scan helps when ultrasound is equivocal, and MRCP or ERCP enters the picture when the common bile duct is poorly seen but suspicion for choledocholithiasis remains high. Operative timing reality: Immediate cholecystectomy is reserved for necrosis, perforation, or emphysematous cholecystitis; most acute cases can safely wait for daytime operative management after antibiotics and surgical evaluation. Post cholecystectomy bounceback: Biloma is a classic return visit after cholecystectomy, usually from a cystic duct clip failure or duct of Luschka leak, and CT is the diagnostic study. We cover the bounceback pattern in the chapter.

Lit Matters 2: Peripheral nerve blocks for primary headache disorders

Primary headache treatment in the ED still hinges on ruling out secondary causes, but peripheral nerve blocks appear to offer a safe adjunct for rapid pain reduction. For migraine, cluster, and tension-type headache, the clearest signal is early benefit from sphenopalatine ganglion and occipital approaches. Peripheral Nerve Blocks for Headache Early pain reduction signal: Peripheral nerve blocks lowered headache pain versus placebo at 15 and 30 minutes, suggesting a real early effect even if the average benefit fell short of a preset clinically significant change. Sphenopalatine ganglion block: The SPG block stands out for ease of administration and favorable safety, making it a practical adjunct to standard migraine therapy; the bedside setup is worth hearing in the episode. Occipital and trigger options: Greater occipital nerve blocks and trigger point injections were also included, reinforcing that this is a broader primary headache strategy rather than a single-technique result. Primary headache population: The evidence applies to benign, nontraumatic primary headaches such as migraine, cluster, and tension-type headache, not secondary headache from hemorrhage, infection, or other dangerous causes. Safety profile reassurance: Across 11 randomized studies with 860 patients, no serious adverse events were reported, supporting nerve blocks as a low-risk adjunct when usual headache treatments are already underway. Adjunct not replacement therapy: The key takeaway is to consider nerve blocks alongside standard headache medications, because direct comparisons against usual care were too limited to establish them as standalone first-line treatment.

TXA: Rx that Breaks My Heart

Tranexamic acid is an antifibrinolytic, not a pro-coagulant, and its value in emergency care depends heavily on the bleeding syndrome in front of you. Trauma hemorrhage, postpartum hemorrhage, and non-massive hemoptysis are the strongest ED use cases; GI bleeding is the clearest place to avoid it. Where TXA Helps Most Trauma hemorrhage benefit: Major traumatic bleeding is the cleanest indication: early TXA lowers mortality, with CRASH-2 showing about a 1.5% absolute reduction when given within 3 hours. Postpartum hemorrhage signal: Postpartum hemorrhage has the best obstetric evidence, with the WOMAN trial showing roughly a 30% reduction in death from bleeding when treatment is early. Pediatric trauma support: Pediatric major hemorrhage trends the same direction as adults, with PED-TRAX suggesting lower mortality and little signal for harm in severe trauma. Non-massive hemoptysis niche: Nebulized TXA can shorten bleeding duration and may prevent progression to massive hemoptysis, a practical distinction we get into in the episode. Where TXA Might Help Atraumatic ICH uncertainty: In spontaneous intracranial hemorrhage, TXA has shown less hematoma expansion and early survival signal without clear long-term functional benefit. Subarachnoid hemorrhage context: Aneurysmal subarachnoid hemorrhage is more nuanced: TXA looks more plausible when definitive aneurysm care is delayed, rather than readily available. Epistaxis mixed evidence: Epistaxis data are conflicting; earlier trials were encouraging, but the NoPAC trial found no reduction in transfusion need or recurrent bleeding. Post-tonsillectomy and dental use: Post-tonsillectomy hemorrhage and dental bleeding have small, low-quality signals of benefit, especially with local application and pressure, but not definitive proof. Where TXA Underperforms GI bleed harms: Acute GI bleeding has moved from maybe to no: HALT-IT showed no mortality benefit and higher risks of venous thromboembolism and seizures. Angioedema weak rationale: Despite a mechanistic appeal in hereditary angioedema, case-level evidence has not shown meaningful clinical benefit for TXA in the ED setting. Risk profile reminder: TXA is inexpensive and generally available, but seizure risk and thrombosis concerns matter most when the evidence for benefit is thin or absent. Bedside yes-maybe-no frame: A simple mental model helps: yes for trauma, postpartum hemorrhage, and non-massive hemoptysis; maybe for select focal bleeds; no for GI bleed. We lay out the practical boundaries in the chapter.

Lit Matters 3: Diagnostic error in the ED

Diagnostic error in the emergency department clusters around a small set of high-harm conditions, with neurologic disease leading the list. Stroke, myocardial infarction, aortic dissection, sepsis, and other time-sensitive diagnoses dominate both missed-harm patterns and malpractice narratives, but the evidence behind headline national estimates deserves careful scrutiny. High-Risk Diagnostic Error Patterns Top missed-harm diagnoses: Stroke, myocardial infarction, aortic aneurysm or dissection, spinal cord pathology, venous thromboembolism, CNS infection, and sepsis account for much of the serious misdiagnosis burden seen in ED data. Neurologic disease concentration: Neurologic conditions made up 34% of the highest-harm group, underscoring how often subtle focal deficits, transient symptoms, and atypical syndromes drive emergency diagnostic failure. Stroke versus MI gap: Myocardial infarction had one of the lowest reported disease-specific error rates at 1.5%, while stroke was missed about tenfold more often at 17%, likely reflecting subjective syndrome recognition rather than ECG criteria. Extreme disease variability: Reported error rates varied widely across conditions, from low rates in MI to 56% in spinal abscess, a reminder that uncommon, protean presentations create disproportionate risk. Atypical presentation traps: Misses were more likely when disease appeared in the wrong age group or with mild, transient, or nonspecific symptoms. We get into the bedside pattern-recognition implications in the episode. What the Review Claimed Per-visit error estimate: The review estimated that 5.7% of ED visits involve at least one diagnostic error, a headline figure with obvious policy implications and equally important methodological caveats. Preventable harm burden: Potentially preventable diagnostic adverse events were estimated at 2.0% of ED visits, with serious permanent disability or death reported at 0.3%. Mortality headline numbers: The paper extrapolated national totals suggesting hundreds of thousands of deaths and severe harms tied to ED misdiagnosis, numbers large enough to demand a close look at how they were derived. Malpractice signal: Malpractice claims linked 89% of diagnostic error cases to failures in clinical decision-making or judgment, though claim data carry major selection bias and cannot stand in for all real-world error. Why the Estimates Are Contested Working diagnosis mismatch: Emergency care often aims for a diagnosis-informed disposition and treatment decision, not a final label, so later disagreement with the inpatient diagnosis is not automatically an ED error. Heterogeneous source studies: The review pooled non-US studies, mixed physician training backgrounds, and settings with different standards of emergency care, limiting how confidently the results translate to US emergency departments. Thin data foundations: Some widely quoted overall error and death estimates trace back to just a few studies, including older single-center data and work not originally designed to measure diagnostic error. Malpractice data limitations: Claims data reflect only filed cases and overrepresent allegations of cognitive error, which can distort the balance between individual judgment failures and the system contributors seen in broader patient-safety research. Methodology worth hearing: The review's intent was quality improvement, but several analytic choices may overstate certainty and scale. We walk through the most important flaws in the chapter.