[Is measuring by portable heart rate monitors (sport watches) dependable in patients with an implanted pacemaker?].
OBJECTIVE
Regular physical exercise is advantageous for physical fitness and endurance. The intensity of exercising can be controlled by portable heart rate monitors. The aim of the study was to investigate if wearable monitors work properly in pacemaker patients.


METHODS
In 30 patients with an implanted single or dual chamber pacemaker made by five different manufacturers their heart rate was determined simultaneously by surface ECG and Holter ECG, and was compared with the heart rates derived from portable heart rate monitors (Polar A1) at rest, during 6 minutes in-house walk, and while exercising at 25, 50, and 75 watts in a bicycle exercise test. The tests were done with pacing set at uni- as well as bipolar stimulation mode.


RESULTS
At rest in two of 30 patients (6,6 %) paced in unipolar mode the portable heart rate monitors counted double. Under exercise conditions the portable monitors counted double in six of 26 patients (23 %) while being stimulated in unipolar mode. In bipolar stimulation mode, the portable heart rate monitors were working properly in all patients under all conditions.


CONCLUSIONS
Patients with an implanted bipolar pacing system can control their physical exercising safely and accurately by means of portable heart rate monitors. Pacemaker patients who are planning regular physical exercising should be provided with an implanted bipolar pacemaker system.
Südkamp
M
M
Klinik und Poliklinik für Herz- und Thoraxchirurgie, Klinikum der Universität zu Köln. michael.suedkamp@uk-koeln.de
Menzel
C
C
Sindhu
D
D
Savvidou-Zaroti
P
P
La Rosée
K
K
Hekmat
K
K
Mehlhorn
U
U
D000328:Adult; D000368:Aged; D015716:Electrocardiography, Ambulatory / Q000592:standards; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000295:instrumentation* / Q000592:standards*; D010138:Pacemaker, Artificial / Q000145:classification