Experience with the Siemens-Elema Variopacemaker

Shanahan, Raymond
June 1978
Angiology;Jun1978, Vol. 29 Issue 6, p440
Academic Journal
This article reports that since 1974, Siemens-Elema Variopace pacemakers have been used for most primary insertions in Cork. Initially 169C units were used until they were replaced by the smaller 159, and more recently by the 179B, which has an 0.5 msec discharge instead of the 1.0 msec discharge of the earlier units. All of these pacemakers are QRS inhibited and have the Vario function, which enables the pacing threshold to be measured after the unit has been inserted. These units are powered by four Mallory cells which yield an impulse amplitude of 5.2 volts. When a magnet is positioned over the unit, the discharge rate increases from the basic rate of about 70 to a rate of 100. This increase indicates that the reed switch has been activated, and overrides spontaneous ventricular activity at slower rates.


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