Rivas-Martin J, Herzer J A, Irlich G, Schulte H D, Seipel L
Langenbecks Arch Chir. 1975 Nov 17;340(2):83-90. doi: 10.1007/BF01259415.
For the purpose of examining the clinical exchange indication 96 removed Demand-pacemakers (type Medtronic 5842, 5843, 5942, 5943) had been sujected to a functional test by the manufacturers. After a service-life from 31-45 months 71% (i.e. 42 out of 59 units) and, in the group with a service-life from 31-35 months, 66% (i.e. 33 out of 51 units) of pacemaker units removed at that time were still working regularly. The mean energy loss exceeded 70% with a simultaneous mean drop of the output voltage down to 2.5 Volts. After the 25th month of the implantation date the number of battery failure increased spasmodically. Under the suspicion diagnosis of "battery exhaustion" a prophylactic "selective" exchange operation of the pace-maker units implied does not appear justifiable to us but in cases with stable AV-Block III. Providing reliable supervision of patients with sufficient self-rhythm, the exchange may be delayed up to about the 40th month after the implantation.
为了检查临床更换指征，96个取出的按需起搏器（美敦力5842型、5843型、5942型、5943型）已由制造商进行了功能测试。在使用31至45个月后，当时取出的起搏器中有71%（即59个中的42个）仍能正常工作；在使用31至35个月的组中，66%（即51个中的33个）的起搏器仍能正常工作。平均能量损失超过70%，同时输出电压平均下降至2.5伏。植入日期后第25个月后，电池故障数量急剧增加。对于“电池耗尽”的疑似诊断，我们认为对起搏器进行预防性“选择性”更换手术并不合理，但对于患有稳定III度房室传导阻滞的病例，在对有足够自身心律的患者进行可靠监测的情况下，更换可推迟至植入后约第40个月。
