Methylene Blue Rescue Therapy for Vasoplegic Shock After Antihypertensive Drug Overdose

Area of Science:

• Cardiology
• Toxicology
• Pharmacology

Background:

• Antihypertensive overdose, particularly involving beta-blockers and calcium channel blockers, commonly causes bradycardia and hypotension.
• Severe toxicity can lead to refractory shock, necessitating vasopressor support.
• Methylene blue, a nitric oxide synthase inhibitor, is a potential treatment for vasoplegic shock unresponsive to vasopressors.

Purpose of the Study:

• To report a case of refractory shock following an overdose of multiple antihypertensive agents.
• To evaluate the efficacy of methylene blue as a rescue therapy in this scenario.

Main Methods:

• A case report of a 47-year-old woman with a history of suicide attempt involving beta-blocker, calcium channel blocker, and angiotensin receptor blocker overdose.
• Initial management included atropine, calcium gluconate, glucagon, dextrose-insulin infusion, and three vasopressors.
• Methylene blue was administered as a bolus for persistent refractory vasodilatory shock.

Main Results:

• The patient developed bradycardia, hypotension, and progressive shock despite standard interventions.
• Administration of methylene blue resulted in rapid and substantial improvement in blood pressure.
• The patient was successfully weaned from vasopressors within 72 hours of methylene blue administration.

Conclusions:

• Methylene blue can be a valuable rescue therapy for refractory vasoplegic shock secondary to antihypertensive agent overdose.
• This case adds to the evidence supporting methylene blue's utility in managing refractory vasoplegia.
• The findings suggest methylene blue is effective even with combined antihypertensive agent toxicity.