Differences in Left- and Right-Sided Blood Pressure – Analysis of 2196 Systematic Measurements by an Aged Male during a Full Year

Both the left- and the right-arm blood pressure of an aged male suffering from hypertension were measured daily for a full year. The measurements were performed three times per day, in the morning, the afternoon, and the evening. During the year of measurements, 9 medication-dependent phases are distinguished. The 2196 sets of measurement data could be compared with the results of a 5-week period with similar measurements of the same individual, almost a year after the end of the first, full-year measuring period. The influence of the medication is significant, and most probably strongly patient-dependent. The common experience that the individuals of the investigated groups tend to show more frequently a higher SBP in the right arm than in the left arm is now, for the first time, confirmed for an individual who was investigated over a prolonged period. His interarm differences (IAD) appeared to show no detectable correlation with the SBP or DBP, and the absolute value of the IAD ranged mostly from -15 (R>L) to +15 (R10 mmHg) is much lower (30%) during periods with medication than during periods without medication (41%).