| Autor: |
Nishino, Masami, Ito, Tatsuo, Miyawaki, Miwa, Nakagawa, Takahiko, Kuryu, Toshiki, Tanahashi, Hideo, Yamada, Yoshio, Abe, Hiroshi |
| Předmět: |
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| Zdroj: |
Angiology; May1994, Vol. 45 Issue 5, p353-360, 8p |
| Abstrakt: |
The effect of changing a rate-responsive pacemaker program (which reacts to evoked QT interval) to fixed-rate ventricular pacing was studied in 10 patients with sick sinus syndrome (SSS). After the patients had been in the rate-responsive mode (WIR) for at least one year, the exercise capacity (maximal oxygen consumption [peak VO2], anaerobic threshold [AT], and cardiac output [CO] at these points) was examined. Three hours later on the same day, the pacemaker was reprogrammed to the fixed-rate pacing (VVI) and the exercise capacity was examined again (VVI-S). One month later, a similar exercise test was also done in the VVI mode (VVI-L). There was no significant difference in peak VO2 and AT between WIR and VVI-S, but both peak VO2 and AT were significantly lower in VVI-L than in VVIR. However, there were no significant differences in the CO at peak VO2 or AT between any of the pacing modes. These findings indicate that a VVIR pacemaker should not be reprogrammed to the VVI mode in SSS patients, because the change can cause the exercise capacity to deteriorate. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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