Hippo ERcast August 2021

An Unusual Overdose + Listener Mail

Tetrahydrozoline ingestion causes a clonidine-like toxidrome with bradycardia and hypotension, and severe cases can follow seemingly benign eye-drop exposures. Also, abnormal uterine bleeding on oral contraceptives often reflects inadequate estrogen dosing or a nonhormonal cause, while compartment syndrome becomes limb-threatening within hours, not days. Tetrahydrozoline Eye-Drop Overdose Imidazoline alpha-2 agonism: Tetrahydrozoline is an imidazoline derivative with central alpha-2 effects, so systemic overdose looks much more like clonidine toxicity than a local ophthalmic exposure. Bradycardia hypotension pattern: The hallmark toxidrome is bradycardia with hypotension from central alpha-adrenergic activation, and even complete AV block has been reported after Visine ingestion. Adult self-harm exposure: Most cases are accidental pediatric ingestions, but adults may present after intentional overdose, making a bottle of eye drops an easy miss in the suicidal patient. Supportive care first: Treatment is mainly supportive with IV fluids, vasopressors for persistent shock, and atropine when clinically important bradycardia is driving the picture. Observation and disposition: Patients generally improve with monitoring and supportive care rather than antidotal therapy. We get into the practical ED course in the episode. Abnormal Bleeding While On OCPs Estrogen dose mismatch: Breakthrough or intermenstrual bleeding while on oral contraceptives is often managed by increasing the estrogen content to a 30-35 mcg pill. Short high-dose rescue: For heavier bleeding between cycles, a temporary higher-intensity oral contraceptive regimen can stabilize the endometrium before transition to a new pack. Tranexamic acid role: If cycles stay regular but the menses themselves are especially heavy, adding tranexamic acid to ongoing OCP therapy may be a useful adjunct. Antiemetic co-prescribing: Escalated estrogen dosing commonly causes nausea, so antiemetics should be prescribed alongside the short rescue course rather than added later. Structural cause warning: Do not assume the bleeding is purely hormonal; fibroid, polyp, malignancy, and bleeding disorder remain key alternatives, and the workup pathway matters. We walk through the practical cautions in the chapter. Chest Pain Protocols And Safety Nets Second troponin timing: A low-risk HEART score should not erase symptom timing; chest pain present for under 6 hours is a common reason to build in an automatic second troponin. Worrisome story override: An abnormal ECG plus a concerning history may justify serial troponins even when a streamlined single-troponin pathway would otherwise seem acceptable. SCAD miss reduction: SCAD is the kind of diagnosis that reinforces protocol discipline, because an initially negative troponin may declare itself only after repeat testing. Protocolization advantage: Standardized chest pain algorithms reduce bedside improvisation and help teams apply the same safety checks reliably across shifts and clinicians.

EEM Rewind: The 7am Positive Blood Culture

A positive blood culture after ED discharge is a callback problem, not an automatic bounce-back. In uncomplicated pyelonephritis, bacteremia usually mirrors the urine isolate and rarely changes therapy, while gram-positive results, indwelling hardware, and Staphylococcus aureus risk factors shift the level of concern. Positive Blood Culture Callbacks Universal phone reassessment: Every discharged patient with a new positive blood culture should be contacted by phone, with immediate attention to clinical trajectory, antibiotic pickup, and whether the current agent is actually active. Pyelonephritis blood culture utility: Uncomplicated pyelonephritis usually does not need blood cultures because positive results commonly match the urine pathogen and almost never force an antibiotic change. Gram-negative rod in pyelo: A gram-negative rod in a pyelonephritis blood culture is usually a true urinary-source bacteremia, but if the patient is improving on a susceptible antibiotic, return to the ED is often unnecessary. Gram-positive result concern: Gram-positive growth after pyelonephritis raises the stakes because contamination is possible but Staphylococcus aureus cannot be shrugged off; we walk through the callback language in the episode. Staph aureus red flag: Suspected or confirmed Staphylococcus aureus bacteremia warrants ED return and IV therapy because of metastatic infection risk, including endocarditis, osteomyelitis, and spinal epidural abscess. Repeat culture strategy: Repeat blood cultures are appropriate in most patients brought back for reassessment, except when the picture is clearly straightforward pyelonephritis; dialysis catheters need paired catheter and peripheral cultures. Contaminant Versus True Bacteremia CoNS contamination problem: Coagulase-negative staphylococci are contaminants more often than pathogens, but true bloodstream infection still occurs in roughly 6% to 26% of cases. Hardware and immunocompromise risk: Foreign material such as valves, shunts, dialysis catheters, or orthopedic hardware sharply raises concern that an apparent skin organism is a real bacteremia. Multiple positive sets: Two or more positive blood culture sets make coagulase-negative staph harder to dismiss as contamination and should push the evaluation beyond a casual phone reassurance. Implanted device return trigger: Patients with indwelling devices and a blood culture growing gram-positive cocci should generally return for broader workup and infectious diseases input. The device-specific pitfalls are worth hearing in the chapter. Source-Specific Follow-Up Decisions Pyelo source reassurance: For pyelonephritis, bacteremia itself does not usually change management if the patient is clinically improving and already taking an effective oral antibiotic. Diverticulitis bacteremia signal: Bacteremia in diverticulitis should prompt a fresh abdominal exam, imaging if not already obtained, and consideration of surgical involvement rather than simple reassurance. Pneumonia discharge nuance: Pneumococcal bacteremia can accompany pneumonia without mandating immediate return if the patient is improving on an effective beta-lactam, which is generally preferred over macrolide or doxycycline. Urine culture follow-up: A positive urine culture only changes management when susceptibilities show the prescribed antibiotic misses the organism; otherwise, no callback-driven regimen change is needed. Resistant urine isolate problem: ESBL urinary isolates force the key distinction between cystitis and pyelonephritis because oral backup options differ, and the practical outpatient choices are laid out in the episode.

Lit Matters #1: CCTA for NSTEMI?

Coronary CT angiography may risk-stratify NSTEMI and NSTE-ACS nearly as well as invasive coronary angiography. The key clinical question is whether CCTA can act as a gatekeeper to the cath lab without missing prognostically important coronary disease. CCTA for NSTEMI Risk Stratification Comparable prognostic signal: In NSTE-ACS, coronary CTA tracked long-term outcomes at least as well as invasive angiography when patients were grouped by CAD severity and extent. Obstructive CAD matters: Patients with obstructive disease had roughly a 1.5- to 1.7-fold higher rate of death, recurrent MI, refractory ischemia, or heart failure than those with nonobstructive CAD. High-risk anatomy detection: CTA identified patients with high-risk obstructive CAD who carried worse long-term outcomes, and it flagged more high-risk anatomy than invasive angiography. Gatekeeper cath-lab concept: A normal or nonobstructive CTA raises the possibility that some NSTEMI patients may not benefit from routine invasive angiography, a distinction we get into in the episode. Anatomic versus functional testing: CCTA is primarily an anatomic test, while invasive angiography can extend to functional and plaque-level assessment with tools like IVUS and OCT. Major unanswered limitation: The study reports hazard ratios rather than false-positive and false-negative performance, so it is less helpful for deciding what a single patient's CTA result truly means.

X Waivers and Buprenorphine Made Easy

Buprenorphine works best in opioid use disorder when the patient is already in withdrawal; starting too early can precipitate a worsening syndrome. ED bridge prescribing has become far easier, with the 2021 X-waiver change removing the old 8-hour training barrier for many US clinicians. ED Buprenorphine Prescribing Basics Withdrawal first principle: Buprenorphine initiation hinges on true opioid withdrawal, not just reported last use; a COWS score above 8 is the practical bedside check before the first dose. Low dose sublingual start: Initial treatment begins with a low sublingual dose, typically 2 to 4 mg, then reassessment and redosing based on symptom relief rather than rushing to a full loading strategy. Precipitated withdrawal clue: Worsening symptoms after the first dose usually mean clinically significant opioid effect is still present at the receptor level, a nuance in the episode that changes the next move. Bridge prescription window: ED prescriptions are usually short bridge courses, often 1 to 2 weeks, to keep patients engaged long enough to connect with outpatient treatment and harm-reduction resources. Diversion risk in context: Buprenorphine does have street value, but the harm profile is still far safer than continued illicit opioid use, especially for patients at high overdose risk. Outcome benefit signal: Starting buprenorphine in the ER is associated with lower overdose mortality and better retention in treatment, making initiation a meaningful emergency-medicine intervention. X Waiver Changes And Limits Training barrier removed: Since April 2021, many US clinicians no longer need the old 8-hour course to obtain an X waiver; an active DEA number and a brief online application may be enough. DATA 2000 waiver role: The X waiver stems from DATA 2000 and authorizes outpatient buprenorphine prescribing for opioid use disorder, which is the key distinction from simply administering a dose in the ED. Thirty patient cap: Newly waivered clinicians start with a 30-patient limit, defined by active patients seen within the last month, with later pathways to higher panels. Three day rule: Clinicians without an X waiver still may administer buprenorphine in person for up to 3 successive days, but they cannot write the outpatient prescription. Outpatient handoff planning: A waiver matters most because it lets the ED serve as a true bridge to treatment rather than a one-time rescue visit. We get into the practical handoff in the chapter.

Lit Matters #2: Angiotensin Converting Enzyme Inhibitor Associated Angioedema

ACE inhibitor angioedema is a bradykinin-mediated airway problem, and predicting who will deteriorate remains difficult. Isolated lip swelling appears lower risk, especially after a longer symptom duration, while tongue swelling and voice change remain the exam findings that should raise concern for impending airway compromise. ACE Inhibitor Angioedema Risk Stratification Isolated lip swelling: Isolated lip swelling is relatively reassuring in ACE inhibitor angioedema, particularly when symptoms have been present for more than 12 hours, but it is not fully sensitive and cannot by itself rule out later airway intervention. Posterior airway warning signs: Tongue swelling and vocal changes are the bedside findings that deserve the most respect, reflecting more concerning posterior involvement than anterior facial swelling alone. Unreliable routine exam findings: Uvula, floor-of-mouth, and soft-palate swelling did not clearly separate intubated from non-intubated patients in this cohort, underscoring how limited exam-based prediction can be. Timing as a risk clue: Rapid progression over the first 6 hours appears more worrisome, whereas isolated symptoms persisting beyond 12 hours seem lower risk. We get into how that timing changes observation decisions in the episode. Role of nasopharyngoscopy: Nasopharyngoscopy may help uncover occult laryngeal involvement, and prior studies have argued for broader ENT evaluation, though exactly who should be scoped remains unsettled.

A Primer on TTP and DIC

TTP and DIC both present with thrombocytopenia and organ injury, but the pattern of clotting versus bleeding points in different directions. TTP is a primary thrombotic microangiopathy with severe hemolysis, while DIC is a secondary consumptive coagulopathy driven by an underlying illness. Differentiating TTP from DIC Shared high-acuity presentation: Both disorders usually announce themselves with a sick, ill-appearing patient, low platelets, and evolving organ damage; isolated thrombocytopenia in a well patient should push you toward another diagnosis. Thrombotic versus hemorrhagic pattern: TTP tends to be more thrombotic, causing confusion, stroke, and renal injury from microvascular occlusion, while DIC more often declares itself with bleeding from IV sites, mucosa, or diffuse oozing. Core coagulation panel clues: The fastest separator is the lab pattern: TTP often has normal INR, PTT, and fibrinogen, whereas DIC typically shows prolonged coagulation studies with low fibrinogen and a striking D-dimer. LDH out of proportion: A markedly elevated LDH, often more than 2 to 3 times normal and out of proportion to the LFT bump, is a classic TTP clue because it reflects both hemolysis and tissue ischemia. Peripheral smear hallmark: Schistocytes plus thrombocytopenia anchor the diagnosis of thrombotic microangiopathy and should sharply raise concern for TTP, especially when paired with MAHA and neurologic symptoms. We get into the smear-and-lab pattern recognition in the episode. TTP pathophysiology and treatment ADAMTS13 failure mechanism: TTP is driven by loss of ADAMTS13 activity, usually from an acquired autoimmune inhibitor, leaving ultra-large von Willebrand multimers free to trigger spontaneous platelet aggregation. Classic but incomplete pentad: The historical pentad is MAHA, thrombocytopenia, fever, renal failure, and neurologic findings, but waiting for all five is a mistake because most patients do not present with the full set. Younger abrupt presentation: TTP often affects younger adults, especially women, and tends to arrive over days with fatigue, bruising, abdominal pain, confusion, and abrupt hematologic deterioration. Plasma exchange mainstay: Untreated TTP is essentially universally fatal, and plasma exchange is the key therapy because it removes the inhibitor and replenishes ADAMTS13 rather than just replacing blood products. Platelet transfusion caution: Avoid platelets in TTP unless bleeding is catastrophic, because adding platelets can worsen the underlying microthrombotic process; the temporizing bridge when exchange is delayed is covered in the chapter. DIC pathophysiology and treatment Secondary thrombin storm: DIC is a disease-induced coagulopathy caused by uncontrolled thrombin generation, producing simultaneous clot formation, factor consumption, and secondary fibrinolysis. Underlying trigger search: DIC is almost always secondary to another critical illness such as sepsis, major trauma, cancer, certain drugs, or obstetric catastrophe, so finding the driver is part of the resuscitation. Treat cause and coagulopathy: Management runs on two tracks at once: control the precipitating disease while supporting the coagulopathy, because correcting labs alone will not stop ongoing consumptive injury. Magic four components: The transfusion backbone is platelets, fibrinogen replacement, FFP, and pRBCs, each used according to bleeding and laboratory deficits rather than reflexively giving everything to everyone. Anticoagulation exception: Routine anticoagulation is generally avoided in DIC, but there are thrombotic phenotypes where that instinct changes. We walk through that bedside distinction in the podcast.

Lit Matters #3: The BASICS Trial - Endovascular Therapy for Basilar Artery Occlusion

Basilar artery occlusion is a devastating posterior-circulation stroke where reperfusion may restore flow without guaranteeing good neurologic recovery. In BASICS, endovascular therapy did not significantly outperform medical management, but the trial leaves real uncertainty about patient selection, imaging, and whether a clinically meaningful benefit was missed. Basilar Artery Occlusion Thrombectomy Neutral primary outcome: BASICS found no statistically significant improvement in favorable functional outcome with endovascular therapy versus standard care, despite a directional signal toward benefit. Recanalization-outcome disconnect: Basilar artery patency at 24 hours was much higher with endovascular therapy, yet that flow advantage did not translate into clearly better neurologic outcomes. Imaging selection gap: CT perfusion was not used to select patients, a major limitation when salvageable tissue likely determines who benefits from posterior-circulation thrombectomy. We get into why that mismatch matters in the episode. Evolving stroke era: Enrollment stretched from 2011 to 2019, spanning major changes in stroke systems and thrombectomy practice that may have diluted a treatment effect. Underpowered signal: The observed differences in death and good functional outcome were modest enough that a far larger trial would be needed to prove or refute a real benefit.

Optimizing Your Patient's Functional Outcome Post Shoulder Reduction

After successful anterior shoulder reduction, prolonged immobilization does not reduce recurrence and can worsen stiffness. Post-reduction care hinges on brief sling use, early protected motion, and timely orthopedic or sports medicine follow-up to preserve function and reduce chronic instability. Post-Reduction Shoulder Care Brief sling immobilization: Standard sling with or without a swathe is appropriate after reduction, but immobilization should be limited to 1 week because longer sling time has not shown added protection against recurrence. Swathe for early comfort: A swathe can help pain control immediately after reduction, but continuous use is best kept to 1-2 days before stepping back to allow gentle shoulder motion and reduce stiffness risk. Early protected motion: Hand, wrist, and forearm motion should start right away, and passive pendulum exercises help prevent adhesive capsulitis while the shoulder itself remains protected from re-dislocation. Movements to avoid: Aggressive external rotation, active abduction, and overhead activity are the main early red flags because they stress the healing anterior structures. We get into the practical restrictions in the episode. External rotation debate: External-rotation bracing with an abduction pillow has some supportive data for recurrence prevention, but poor comfort and compliance have kept the traditional sling as the usual real-world choice. Follow-Up and Recurrence Prevention Early specialist referral: All patients with a shoulder dislocation deserve orthopedic or sports medicine follow-up, ideally within 7-10 days, because delayed definitive care is linked to worse long-term stability. Physical therapy timing: Physical therapy started within 7-10 days can help preserve range of motion and lower the risk of frozen shoulder after a period of brief immobilization. Young active surgical benefit: Young, active patients are more likely to benefit from primary surgical stabilization, with better functional outcomes and lower recurrence than watchful nonoperative care alone. Early surgery matters: Time from first dislocation to surgery tracks with recurrence risk, so early referral matters most in patients likely to need operative stabilization. That timing nuance is worth hearing in the chapter. Frequent dislocator counseling: Patients who repeatedly self-reduce may seem fine in the short term, but recurrent instability carries real risk of osteoarthritis, chronic pain, and labral injury over time. Self-reduction teaching: For selected recurrent dislocators, the Boss-Holzach-Matter technique is a named self-reduction method worth knowing while they pursue definitive prevention strategies with a specialist.