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Long‐Term Follow‐up of Pulse Width Threshold of Transvenous and Myo‐epicardial Leads
Author(s) -
HENGLEIN DAGMAR,
GILLETTE PAUL C.,
SHAN CATHLEEN,
BURNS GINA
Publication year - 1984
Publication title -
pacing and clinical electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.686
H-Index - 101
eISSN - 1540-8159
pISSN - 0147-8389
DOI - 10.1111/j.1540-8159.1984.tb04887.x
Subject(s) - medicine , pulse (music) , transvenous pacing , cardiology , detector , electrical engineering , engineering
Postoperative pulse width thresholds were measured at a constant of 5 volts in 140 patients. In 41 patients, transvenous atrial and/or ventricular leads were implanted at a median age of 13 years (3–78 yrs). Myo‐epicardial leads were implanted in 99 patients at a median age of 8 3/4 years (1 wk to 76 yrs). The initial rapid rise of threshold was found to persist not longer than to the third follow‐up period of 11 days to 5 weeks in all atrial and transvenous ventricular leads; in myo‐epicardial ventricular leads it persisted until the period of more than 5 weeks to 6 months. During initial rise, pulse width threshold m + sem did not exceed 0.45 ms. We therefore suggest that a pulse width setting of 0.5 ms at 5 V is a safe setting for this period. In only one patient did a late rise of threshold occur. The comparison of pulse width thresholds of transvenous versus myo‐epicardial leads showed lower mean values for transvenous atrial leads in each follow‐up period, but the difference was not statistically significant. The pulse width thresholds of transvenous ventricular leads were significantly lower than those of myo‐epicardial leads in some follow‐up periods. We therefore conclude that transvenous leads have a slight advantage with regard to postoperative pulse width threshold.