Method: Power analysis: the investigators performed a power analysis based on expectations and clinical experience of the research group. Figure 1 shows two hypothetical truncated lognormal distributions of patient overall satisfaction with the pacemaker, where median overall satisfaction of the intramuscular and the subcutaneous group are assumed to be 2.4 and 4, respectively. Monte Carlo-simulations from these distributions showed that a total of 200 patients, 100 in each arm, would yield a statistical power of 90% for Mann-Whitney U-test at a significance level of 0.05.