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APPENDIX C ICHD PACEMAKER IDENTIFICATION CODE 1st letter Chamber-paced 2nd letter Chamber-sensed 3rd letter Mode of Response V = ventricle A = atrium D = dual chamber O = not applicable V = ventricle A = atrium D = dual chamber O = not applicable I = inhibited T = triggered D = either O = not applicable Examples: ≤ Asynchronous pacing: the ventricular electrode paces but has no sensing function and cannot respond to intrinsic cardiac activity; thus, VOO. ≤ AV synchronous pacing: sensing in the atrium, pacing in the ventricle; a sensed P wave causes the pacer to fire into the ventricle after an AV delay; thus, VAT. ≤ Ventricular inhibited (‘‘demand’’) pacing: the ventricular electrode both senses and paces, and a sensed R wave inhibits it from firing; thus, VVI. Source: Inter-Society Commission for Heart Disease Resources, Pacemaker Study Group, ‘‘Implantable Cardiac Pacemakers: Status Report and Resource Guideline,’’ Am J Cardiol 34 (1 October 1974): 488. ...

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