| 摘要 |
<p>A dual chamber pacemaker system provide for safe tracking of PACs. The pacemaker obtains an indication of when the T-wave has occurred within the cycle when the PAC occurs, either by measuring the T wave during the cycle (41B), or by getting a QT interval measure from one or more prior cycles (42B). The pacemaker determines a safe V-V interval as the QT interval measure plus a safety factor (43B, 46B, 48B), the safety factor being selected so as to insure that a pulse that tracks the PAC does not get delivered during the vulnerable period. A PAC is tracked if and only if the VA interval plus the AV delay is as great as the safe V-V interval (73).</p> |
