Ventricular function after internal defibrillation

Locally propagated activation immediately after internal defibrillation.

BACKGROUND Electrical mapping studies indicate an interval of 40 to 100 ms between a defibrillation shock and the earliest activation that propagates globally over the ventricles (globally propagated activation, GPA). This study determined whether activation occurs during this interval but propagates only locally before being blocked (locally propagated activation, LPA). METHODS AND RESULTS I...

Spontaneous ventricular defibrillation.

* The British Heart J'ournal welcomes letters commenting on papers that it has published within the past six months. * All letters must be typed with double spacing and signed by all authors. * No letter should be more than 600 words. * In general, no letter should contain more than six references (also typed with double spacing). Permanent pacing after cardiac trans-plantation SIR,-Scott et al...

Ventricular defibrillation: the Belfast experience.

Hemodynamic effects of ventricular defibrillation.

Hemodynamic responses to ventricular defibrillation were studied in anesthetized dogs. Observations were made on arterial, right atrial and left ventricular end-diastolic pressures, on cardiac output (dye dilution), heart rate, and right atrial electrocardiogram. Ventricular fibrillation was induced electrically with a bipolar electrode catheter placed in the right ventricle. Fibrillation was m...

Ventricular defibrillation with triphasic waveforms.

BACKGROUND It has been reported that triphasic defibrillation waveforms cause less myocardial injury than biphasic waveforms. This study compared the defibrillation thresholds (DFTs) of triphasic and biphasic waveforms. METHODS AND RESULTS ++DFTs were determined for a transvenous lead system and a 300-microF-capacitor defibrillator. In 8 pigs (group 1), DFTs were determined for 5 triphasic wa...