[Transthoracic ventricular defibrillation: effectiveness of bipolar sinusoidal impulse]

Area of Science:

• Cardiology
• Electrophysiology

Background:

• Sudden cardiac arrest due to ventricular fibrillation (VF) remains a critical medical emergency.
• Effective defibrillation strategies are crucial for improving patient outcomes.
• The role of low-energy bipolar pulses in defibrillation requires further investigation.

Purpose of the Study:

• To evaluate the efficacy of low-energy bipolar pulses for terminating ventricular fibrillation (VF).
• To determine the optimal energy levels for defibrillation in patients with primary and secondary VF, including those with acute myocardial infarction.

Main Methods:

• A study involving 41 patients experiencing sudden cardiac arrest due to VF.
• Analysis of defibrillation efficacy using low-energy bipolar sinusoidal charges.
• Assessment of energy requirements for primary VF (30 episodes) and secondary VF (76 episodes).

Main Results:

• Maximal effective energy for primary VF was low (≤90 J x 1-2).
• Only 25% of patients required higher energy (165-195 J x 1-5) for secondary VF elimination.
• An overall efficacy of 87% was achieved with charges of at least 115 J x 1-2 for both primary and secondary VF.

Conclusions:

• Low-energy bipolar sinusoidal charges demonstrate high efficacy in eliminating VF.
• This approach is effective for patients with acute myocardial infarction and other coronary diseases.
• Reduced energy levels in defibrillation may offer a safer and more effective treatment strategy.