Asystole in ultrabrief pulse electroconvulsive therapy.

Area of Science:

• Neurology
• Cardiology
• Psychiatry

Background:

• Ultrabrief (UB) pulse electroconvulsive therapy (ECT) is increasingly used due to a better cognitive side effect profile than brief pulse ECT.
• UB pulses delivered at maximal charge last 8 seconds.
• Electrical stimulation during ECT can cause parasympathetic surges and transient asystole.

Purpose of the Study:

• To compare cardiac pause length between 8-second UB pulses and 4-second brief pulses delivered at maximal charge.
• To investigate the effect of pulse width and duration on cardiac pause during ECT.

Main Methods:

• Retrospective study analyzing cardiac pause length in patients undergoing ECT.
• Data collected from The Johns Hopkins Hospital over a 1-year period.
• Focus on right unilateral ECT placement at maximal charge.

Main Results:

• Pulse width did not affect electrocardiac pause length for right unilateral ECT at maximal charge.
• Cardiac pause length was significantly influenced by stimulus duration (2 vs. 4 seconds) with brief pulses (P < 0.0001).

Conclusions:

• Right unilateral ECT at maximal charge is not affected by pulse width.
• Findings suggest pulse duration, not width, is a key factor in cardiac pause for brief pulse ECT, despite study limitations like small sample size and retrospective design.