Low vs. high measurement frequency
The present findings are in accordance with two smaller studies, which compared hourly measurements with 4 measurements per hour without detecting any difference in BP values [The most utilized method for investigating the influence of measurement frequencies is post-hoc random removal of individual measurements after performing a single ABPM, to simulate a lower measurement frequency [A possible concern using LF-ABPM could be that failed measurements might influence BP estimation to a larger degree than for HF-ABPM. Our study was not designed to answer this concern, but we found no indication of this as SBP difference between HF-ABPM and LF-ABPM did not seem to change with fewer successful measurements during LF-ABPM. However, since only 12 patients had less than 20 successful measurements, this finding is uncertain. Yang et al. found as few as 8 valid daytime readings and 4 valid nighttime readings were enough for results to be comparable to what was attained using current guideline recommended frequencies [