Title: Exercise tolerance in patients with permanent cardiac pacing
- Barbara Małecka, Jacek Lelakowski, Jacek Bednarek, Jacek Majewski, Igor Tomala
- Original articles
- Polish Journal of Cardiology
- Start page:
- Final page:
- permanent cardiac pacing, exercise tolerance, 6-min. walk test
Introduction: The term exercise tolerance means the ability to perform physical exercise without experiencing significant homeostasis disorders or physiological disturbances.
The aim: The aim of this study was to assess the exercise tolerance in representative group of patients with permanent pacemaker.
Material and method: Exercise tolerance evaluation in the group of 190 pacemaker patients (100 males, 90 fe-males; aged 50-85, mean 68,6) was performed using the 6-minutes corridor walk test (M6). Poor tolerance was defined as exercise-induced supraventricular and ventricular arrhythmia, inappropriate increase of blood pressure or angina. Poor exercise tolerance was studied analyzed in entire group as well as in three subgroups characterized by: low, median, and good exercise capacity evaluated in M6 test by relative wor-kload. The analysis of cardiac disorders proportional presence in the cohorts of good and poor exercise tolerance, as well as basie heart ratę behavior had been also carried out.
Results: Poor exercise tolerance oceurred in 44.5% of all patients. Its prevalence in subgroups characterized by low, median and good capacity evaluated by relative exercise loading, was evenly distributed. The differences in preexisting cardiac disorders and basie heart ratę behavior between the cohorts with good and poor exercise tolerance were insignificant. Exercis induced arrhythmia was the most frequent indicator of poor tolerance. Complex ventricular arrhythmia (couplets, salvos) were found four times more often in the patients reaching the highest levels of exercise loading. The patients did not notice the exercise-in-duced arrhythmias during the test. Conclusions:
1. The walk test revealed poor exercise tolerance in almost half a group of pacemaker patients.
2. Test M6 supported by electrocardiograph monitoring became useful in ambulatory evaluation of exerci-se tolerance in pacemaker patients.