Untitled

Abstract

LV dysfunction prolongs averaged VFCL in patients at risk for malignant ventricular arrhythmias who have implantable cardioverter defibrillators. This phenomenon might be related to alterations in the ventricular refractory period.

Atrial fibrillation promotion in a rat model of heart failure induced by left ventricle radiofrequency ablation

“…Due to poor catheter stability, atrial refractory periods were not evaluated by extra-stimulus testing. As a result, we have used the AF cycle length recorded in the intracavitary electrodes as an estimate of atrial refractoriness [ 17 , 18 ]. AF intervals were longer in the ablation group than in sham animals, but this difference did not reach significance.…”

“…Due to poor catheter stability, we were not able to reliably assess right atrial refractory periods by extra-stimulus testing. Therefore, we used the AF cycle length recorded in the intracavitary electrodes as an estimate of atrial refractoriness [ [17] , [18] ]. The AF cycle length analysis consisted of manually measuring using electronic calipers (same blind observer) the atrial electrical activity intervals (averaging 10 to 20 cycles) during the 31st second of the AF episode of animals with sustained AF.…”

Ventricular fibrillation waveform characteristics of the surface ECG: Impact of the left ventricular diameter and mass

“…Measures related to the VF amplitude Acute myocardial infarction [13][14][15] = ↓/= Previous myocardial infarction [13,[16][17][18]22] ↓/= ↓ Increased LV diameter [17] ↓ = Increased LV mass = ↑/= Low LV ejection fraction [33] ↓ Unk Beta blockers [28] ↓ Unk Class III anti-arrhythmic drugs [17] ↓ = Longer arrest duration [34,35] ↓ ↓ CPR [36,37] ↑ ↑ CPR: cardiopulmonary resuscitation, LV: left ventricular, unk: unknown, VF: ventricular fibrillation.…”