Table 5

Pacemaker upgrades

First PM typeSecond PM typeN=10Upgrade indication
AAIDDD1DAV 3, syncope
VVIVVI-ICD2Sustained VT, resuscitation*
VVIDDD-ICD1Heart failure
DDDDDD-ICD1Presyncope and documented NSVT
DDDCRT-P1Generator replacement, dyssynchrony and heart failure
DDDCRT-D2Heart failure (n=2), symptomatic NSVT (n=1)
VVI-ICDDDD-ICD1Symptomatic bradycardia
VVI-ICDCRT-D1Heart failure
  • *Additionally, one individual received a second upgrade later from VVI-ICD to CRT-D.

  • CRT, cardiac resynchronisation therapy; DAV, distal atrioventricular block; ICD, implantable cardioverter defibrillator; NSVT, non-sustained ventricular tachycardia; PM, pacemaker.