Retrospective study on the longevity of SSIR and DDD pacemakes: comparison with that of SSI pacemakers

• Published in: Jinko Zoki Vol. 25; no. 3; pp. 610 - 612
• Main Authors: MASEKI T, OHARA Y, WATANABE T, YASUURA K, MURASE M
• Format: Journal Article
• Language: Japanese
• Published: 一般社団法人 日本人工臓器学会 1996; JAPANESE SOCIETY FOR ARTIFICIAL ORGANS
• Subjects: end of life index; longevity of pacemakers; ODD and SSIR; projected longevity; warranty period of pacemakers
• ISSN: 0300-0818; 1883-6097
• DOI: 10.11392/jsao1972.25.610

Eight SSIR pacemakers (PM), 13 DOD-PM and 11 SSI-PM were studied from 1980 to 1995 with special reference to battery longevity. The longevity of PM was defined to the period from implantation to explantation. PM longevity was compared among the mode and with the Japanese warranty period. The longevity of PM which were replaced according to the end of life (EOL) index was compared with the projected longevity of manufacturer. The output of PM explanted according to the EOL index was compared with the initial output. The longevity of SSI, SSIR and DOD was 9.9, 7.2 and 7.5 yrs. respectively. The longevity of SSI was significantly longer than that of SSIR and DDD. The longevity of SSI and DDD was significantly longer than the Japanese warranty period. The mean longevity of SSI and DDD replaced according to the EOL index was the same to the projected longevity. That showed the accuracy of EOL index. The output of DDD explanted according to the EOL index was significantly lower than the initial output. In conclusion PM can be replaced according to the EOL index and the Japanese warranty period may be reconsidered. 1980年より1995年の間に使用され交換されたSSIRペースメーカー(PM)8個・DDD-PM13個を対象として, その寿命をSSI-PM11個と比較した。また3群の寿命を保証期間と比較した。PMの寿命は植え込みより摘出までの期間と定義した。電池交換(EoL)指標に従って交換したPMは, その寿命を目標寿命と比較し, 摘出時の出力電圧を初期電圧と比較した。平均寿命はSSI, SSIR, DDDの順に9.9, 7.2, 7.5年であった。SSIはSSIR, DDDより有意に長寿命であった。SSIおよびDDDは保証期間より有意に長寿命であり, そのうちEOL指標に従った交換例の平均寿命は目標寿命と有意差を認めなかった。このことはEOL指標の妥当性を示す。また摘出時のDDDの出力は初期出力より有意に低下していた。以上より電池交換指標に従った交換が可能であり, また保証期間より長期にわたる使用が可能と思われた。