R
Rate
Too slow to perfuse
Bradycardia or AV block. Trial atropine, but expect limited durability. Epinephrine often does more work.
PRN Education · The Curbside · Medical Toxicology
Rate, Pump, Pipes.
A large beta-blocker or calcium-channel blocker ingestion is not an antidote quiz. Find the physiology that is failing. Support it while the drug history catches up.
Read the shock.
The bottle is evidence. The bedside is the problem.
First question: Is the dominant failure rate, pump, pipes, or all three?
P
Pump
Low cardiac output
Weak LV, narrow pulse pressure, cool skin, rising lactate. Start high-dose insulin early. Add inotropy. Call for VA-ECMO before the spiral.
P
Pipes
Vascular tone is gone
Warm shock with preserved or hyperdynamic LV. Norepinephrine is the workhorse. Massive amlodipine can do this without early bradycardia.
Look for
Serial ECG, glucose, lactate, pH, potassium, magnesium, ionized calcium, renal function, urine output, and repeated POCUS. Trend the physiology. One normal snapshot is not clearance.
Use clues. Do not marry them.
Selectivity disappears at toxic doses.
| Finding | Pulls you toward | What it changes |
|---|---|---|
| Hyperglycemia | CCB | Supports severe CCB physiology. It is not diagnostic. |
| Hypoglycemia | Beta-blocker | Correct it. Do not delay hemodynamic treatment. |
| Vasoplegia + normal HR | DHP CCB | Think amlodipine. Build the pipes lane. |
| Seizure + wide QRS | Propranolol | Give sodium bicarbonate for membrane stabilization. |
| Long QT / torsades | Sotalol | Magnesium, overdrive strategy, and consider dialysis. |
| Depressed LV | Either | High-dose insulin, inotropy, early mechanical-support call. |
Run three lanes. In parallel.
Do not wait for one therapy to fail.
01
Support now
- Small fluid challenges. Reassess.
- Norepinephrine for vasoplegia.
- Epinephrine for rate or pump failure.
- Arterial line and serial POCUS early.
02
Fix metabolism + agent
INSULIN 1 U/kg IV bolus → 1 U/kg/hr
Titrate to perfusion per tox/local protocol. Give dextrose as needed. Check glucose q15–30 min initially; K frequently.
Titrate to perfusion per tox/local protocol. Give dextrose as needed. Check glucose q15–30 min initially; K frequently.
- CCB: calcium chloride or gluconate.
- Beta-blocker: glucagon trial.
- Propranolol: sodium bicarbonate if QRS widens.
03
Prepare rescue
- Poison Center: 1-800-222-1222.
- Pharmacy: concentrated insulin and dextrose.
- ECMO-capable center: call before arrest.
- Dialysis: atenolol, nadolol, or sotalol.
Red line
Do not run an antidote parade. Atropine. Wait. Glucagon. Wait. Calcium. Wait. Insulin after collapse. That sequence burns the only resource you cannot replace: time.
Know what each tool can do.
A response is useful. A promise is dangerous.
Good
High-dose insulin is hemodynamic therapy.
It improves inotropy and myocardial carbohydrate use. The effect is not instant. Start vasopressors with it. Anticipate hypoglycemia, hypokalemia, and volume load from dextrose.
Pitfall
Electrical capture is not perfusion.
Pacing may capture the ECG and still produce weak mechanical output in a poisoned myocardium. Confirm a pulse and stroke volume. Do not let the pacer delay metabolic and circulatory support.
Good
Calcium and glucagon are adjuncts.
Calcium is reasonable in life-threatening CCB poisoning. Glucagon is reasonable for symptomatic beta-blocker bradycardia or hypotension. Either response may be partial or transient.
Pitfall
Lipid is not routine rescue.
Evidence for IV lipid emulsion in beta-blocker and CCB shock remains uncertain. Reports include abrupt arrest after administration. Use only after toxicology discussion in selected peri-arrest cases.
Close the vasoplegia gap.
Community shop move: buy time without buying delay.
Rescue · refractory pipes failure
Methylene blue before the crash, not instead of the transfer.
Consider when MAP remains inadequate despite catecholamines, vasopressin, calcium, and high-dose insulin, and POCUS shows preserved or hyperdynamic contractility. The best signal is severe vasodilatory CCB shock, especially amlodipine. Evidence is case-level and responses may be transient.
METHYLENE BLUE 1–2 mg/kg IV over 10–30 min
Rescue dosing is off-label and not standardized. Use Poison Center / medical toxicology guidance.
Rescue dosing is off-label and not standardized. Use Poison Center / medical toxicology guidance.
Check first
- Serotonergic drugs, opioids, dextromethorphan.
- Known G6PD deficiency: contraindicated.
- Pregnancy: fetal risk.
Expect
- Falsely low pulse-ox readings.
- Blue urine and skin discoloration.
- Close monitoring for serotonin toxicity.
Still crashing?
Methylene blue treats vasoplegia. It does not replace flow. Persistent cardiogenic or mixed shock needs early VA-ECMO mobilization or transfer. Do not wait for refractory acidemia and multiorgan failure to make the call.
Make the tox call useful.
Bring the movie, not one frame.
Have ready
- Exact bottles, formulation, pill count, time.
- Coingestants and serotonergic medications.
- Serial ECG, glucose, lactate, pH, electrolytes.
- POCUS phenotype and response to each therapy.
- Current pressors, insulin rate, transfer capability.
The one-line takeaway
The antidote is a coordinated resuscitation.
When the bottle is unclear, treat rate, pump, and pipes. Use glucose, ECG, POCUS, and response to treatment to refine the diagnosis without pausing the resuscitation.
Epic note block.
Copy. Edit. Own the details.
.CARDIOTOXICINGESTION Large suspected [BETA-BLOCKER / CCB / UNKNOWN] ingestion at [TIME], formulation [IR/ER]. Shock phenotype is predominantly [RATE / PUMP / PIPES / MIXED] based on ECG, examination, and serial POCUS. Current support: [PRESSORS + DOSES]. High-dose insulin: [BOLUS / INFUSION RATE] with protocolized glucose and potassium monitoring. Adjuncts given and response: [CALCIUM / GLUCAGON / BICARBONATE / OTHER]. Poison Center / toxicology contacted at [TIME]. ECMO-capable transfer discussion initiated at [TIME]. Hemodynamics and perfusion remain under continuous reassessment.