A 31-year-old man arrives gray and diaphoretic, his shirt damp with sweat and the monitor tracing wide, slow complexes at 42 beats per minute. His blood pressure is sixty-eight over forty despite a rapidly escalating vasopressor infusion, and each pulse feels weaker than the last. Friends found an empty prescription bottle beside him but cannot say how many tablets were missing. The resuscitation team is deciding whether another antidote attempt will work—or whether the next move must be mechanical support.

— What’s your move? Read on.

Before you read
  • What reversible physiology must be corrected before cannulation?
  • Which antidotes and extracorporeal strategies can bridge the patient to toxin clearance?

When to Think of It

Consider extracorporeal support in toxin-induced refractory cardiogenic shock, malignant dysrhythmia, persistent peri-arrest hypotension, or cardiac arrest despite high-quality conventional resuscitation and a potentially reversible exposure. Common scenarios include sodium-channel blockers, calcium-channel blockers, β-blockers, tricyclic antidepressants, membrane-active antiarrhythmics, and severe cardiotoxic plant or drug poisoning.

Sick or Not Sick

Sick versus not sick hinges on refractory circulatory failure despite optimized antidote-directed resuscitation. The call that matters most is whether the patient is entering a low-flow spiral—worsening lactate, rising vasopressor requirement, poor perfusion, and declining echocardiographic contractility—before irreversible arrest.

The First Fifteen Minutes

  • Activate the poison center, toxicologist, cardiology/ECMO team, and transfer pathway immediately; ECMO should be discussed before arrest.
  • Secure oxygenation and ventilation; intubate for inability to protect the airway, severe agitation, or respiratory failure, while avoiding peri-intubation hypotension.
  • Pulseless arrest → epinephrine 1 mg IV/IO every 3–5 minutes, because α-mediated vasoconstriction improves coronary and cerebral perfusion during CPR.
  • Wide QRS or ventricular dysrhythmia suggesting sodium-channel blockade → sodium bicarbonate 1–2 mEq/kg IV bolus, repeat every 3–5 minutes to narrow the QRS; check pH and avoid severe alkalemia.
  • Calcium-channel-blocker shock → regular insulin 1 unit/kg IV bolus, then 1–10 units/kg/hour infusion with dextrose, because insulin improves myocardial carbohydrate utilization and contractility; check glucose every 15–30 minutes and maintain euglycemia.
  • Calcium-channel-blocker or β-blocker shock with hypocalcemia or severe hypotension → calcium chloride 1 g IV through a central line, or calcium gluconate 3 g IV peripherally, because increased extracellular calcium supports contraction; repeat based on ionized calcium and hemodynamics.
  • Refractory lipophilic cardiotoxicity after standard therapy → 20% lipid emulsion 1.5 mL/kg IV bolus, then 0.25 mL/kg/min, because an intravascular lipid phase can bind lipophilic toxin; dosing and repeat limits vary—confirm with the poison center.
  • Begin balanced crystalloid only for suspected hypovolemia; avoid repeated large boluses in cardiogenic shock. Obtain ECGs serially, bedside echo, glucose, electrolytes, calcium, blood gas/lactate, temperature, acetaminophen level, and a focused co-ingestant evaluation.

Definitive Care & Disposition

VA-ECMO is a bridge to toxin redistribution, metabolism, antidote effect, or organ recovery—not a substitute for antidote therapy and source control. Cannulate early for persistent shock, recurrent ventricular arrhythmia, or arrest with recoverable physiology; consider arterial-line monitoring and left-ventricular unloading if distension develops. Hemodialysis or hemoperfusion may be added for dialyzable toxins such as lithium, valproate, or severe salicylate poisoning. These patients require ICU care at a toxicology-capable ECMO center.

How This One Kills

The fatal error is waiting for cardiac arrest before calling ECMO; prolonged no-flow/low-flow time can make a reversible toxin-induced cardiomyopathy nonrecoverable and makes cannulation far less successful.
The Differential — What Else Looks Like This
  • Acute coronary occlusion — regional wall-motion abnormality and ischemic ECG pattern; confusing it with pure toxic cardiomyopathy delays reperfusion.
  • Septic shock — infectious source and vasoplegia predominate rather than profound toxin-pattern conduction disease; anchoring on sepsis delays antidote therapy.
  • Massive pulmonary embolism — acute right-ventricular strain and obstructive physiology; treating it as toxic cardiogenic shock delays thrombolysis or embolectomy.
  • Intracranial catastrophe — focal neurologic findings or abnormal pupils may dominate; assuming poisoning can delay neuroimaging and neurosurgical care.

The Second-Day Story

A patient may have no witnessed ingestion, no empty bottle, and a near-normal initial ECG before abruptly developing shock. Older adults may present with collapse or unexplained lactate elevation, while patients receiving early antidotes may transiently improve and then relapse as drug redistribution occurs. Serial ECGs, bedside echocardiography, medication access, and trajectory—not a negative screening toxicology panel—identify the patient who needs an early ECMO discussion.
Back to Our Patient
Back to our 31-year-old man: the wide-complex bradycardia, profound hypotension, empty prescription bottle, and worsening lactate make him sick, with refractory toxic cardiogenic shock rather than an observation-level ingestion. The team performs airway and CPR preparation, gives epinephrine if pulseless, administers sodium bicarbonate for the wide QRS, obtains bedside echo, and calls toxicology and the ECMO service immediately; toxin-directed therapy is continued while VA-ECMO is mobilized. He is cannulated before prolonged arrest, stabilized in the ICU, and later weaned after cardiac recovery.
Patient Presentation to Attending
How you’d present this patient on the floor — tight, pertinent positives and negatives, no rambling
“This is a 31-year-old man with suspected intentional prescription-drug ingestion presenting with profound hypotension and wide-complex bradycardia. He was found beside an empty bottle, is diaphoretic and poorly perfused, and has progressively worsening blood pressure despite vasopressor support; there is no clear trauma, fever, or focal neurologic deficit. ECG shows a markedly widened QRS with ventricular ectopy, lactate is rising, and bedside echo shows severely depressed global LV function. I’m concerned for toxin-induced cardiogenic shock with sodium-channel blockade and impending arrest. I’m giving bicarbonate, checking glucose, electrolytes, calcium, and co-ingestant levels, and have activated toxicology and the VA-ECMO team for early cannulation while continuing resuscitation.”

Study Directive

  • Draw a one-page algorithm for toxin-induced cardiogenic shock: ECG pattern → antidote → ECMO trigger → extracorporeal clearance.
  • Memorize bicarbonate, high-dose insulin, calcium, and lipid-emulsion dosing, then verify your institution’s ECMO activation criteria.
  • Review one case of VA-ECMO in tricyclic, calcium-channel-blocker, and β-blocker poisoning with a toxicologist or ECMO specialist.
  • Practice a 30-second phone call requesting ECMO consultation before cardiac arrest.

Recent Literature