J. Mcanulty et al., A COMPARISON OF ANTIARRHYTHMIC-DRUG THERAPY WITH IMPLANTABLE DEFIBRILLATORS IN PATIENTS RESUSCITATED FROM NEAR-FATAL VENTRICULAR ARRHYTHMIAS, The New England journal of medicine, 337(22), 1997, pp. 1576-1583
Background Patients who survive life-threatening ventricular arrhythmi
as are at risk for recurrent arrhythmias. They can be treated with eit
her an implantable cardioverter-defibrillator or antiarrhythmic drugs,
but the relative efficacy of these two treatment strategies is unknow
n. Methods To address this issue, we conducted a randomized comparison
of these two treatment strategies in patients who had been resuscitat
ed from near-fatal ventricular fibrillation or who had undergone cardi
oversion from sustained ventricular tachycardia, Patients with ventric
ular tachycardia also had either syncope or other serious cardiac symp
toms, along with a left ventricular ejection fraction of 0.40 or less.
One group of patients was treated with implantation of a cardioverter
-defibrillator; the other received class III antiarrhythmic drugs, pri
marily amiodarone at empirically determined doses. Fifty-six clinical
centers screened all patients who presented with ventricular tachycard
ia or ventricular fibrillation during a period of nearly four years. O
f 1016 patients (45 percent of whom had ventricular fibrillation, and
55 percent ventricular tachycardia), 507 were randomly assigned to tre
atment with implantable cardioverter-defibrillators and 509 to antiarr
hythmic-drug therapy. The primary end point was overall mortality. Res
ults Follow-up was complete for 1013 patients (99.7 percent). Overall
survival was greater with the implantable defibrillator, with unadjust
ed estimates of 89.3 percent, as compared with 82.3 percent in the ant
iarrhythmic-drug group at one year, 81.6 percent versus 74.7 percent a
t two years, and 75.4 percent versus 64.1 percent at three years (P<0.
02). The corresponding reductions in mortality (with 95 percent confid
ence limits) with the implantable defibrillator were 39+/-20 percent,
27+/-21 percent, and 31+/-21 percent. Conclusions Among survivors of v
entricular fibrillation or sustained ventricular tachycardia causing s
evere symptoms, the implantable cardioverter-defibrillator is superior
to antiarrhythmic drugs for increasing overall survival. (C) 1997, Ma
ssachusetts Medical Society.