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Initial Clinical Experience with a New Dual Sensor SSIR Pacemaker Controlled by Body Activity and Minute Ventilation
Author(s) -
ALT ECKHARD,
COMBS WILLIAM,
FOTUHI PARWIS,
BAMBL ERWIN,
WAHLSTRAND JOHN,
WILLHAUS RICHARD
Publication year - 1995
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.1540-8159.1995.tb06735.x
Subject(s) - medicine , chronotropic , treadmill , heart rate , cardiology , respiratory minute volume , cardiac pacing , ventilation (architecture) , anesthesia , blood pressure , respiratory system , mechanical engineering , engineering
Fourteen patients were implanted with a single chamber dual sensor pacemaker (Legend Plus®) that measures minute ventilation (VE) via variations in impedance between a bipolar lead and the pacemaker case, and activity via a piezoelectric crystal bonded to the pacemaker case. Chronotropic incompetent patients were exercised an a treadmill and a bicycle in dual sensor mode. Activity only indicated pacing rate was measured using a strap‐on pacemaker. Both implanted and strap on pacemakers were adjusted to yield a steady‐state pacing rate of 100 beats/min during hall walk. Pacing rate, VE, and oxygen uptake (VO 2 ) were measured continuously. Linear curve fit analysis slopes for plots of VE versus pacing rate during exercise (1.33‐1.49) compared favorably to values reported in normals. Peak pacing rates achieved for treadmill and bicycle testing for dual sensor mode were higher than activity mode alone. Slopes of heart rate to VE or VO 2 were not significantly different (P < 0.05) for dual sensor mode in contrast to activity alone. In conclusion, the Legend Plus dual sensor rate adaptive pacing therapy delivered pacing rates more proportional to VE and VO 2 under different types of exercise than rates indicated by a strap‐on pacemaker in activity mode.