LONG-TERM REPRODUCIBILITY AND USEFULNESS OF DAYTIME RECORDING OF NONINVASIVE 24-HOUR AMBULATORY BLOOD-PRESSURE MONITORING IN BORDERLINE HYPERTENSION - A 2-YEAR FOLLOW-UP-STUDY

We investigated the long-term reproducibility of noninvasive 24-hour a mbulatory blood pressure monitoring (ABPM) compared with casual blood pressure measurements in 54 individuals (47+/-11 years) with borderlin e hypertension. ABPM and casual blood pressure measurements were obtai ned 3 times over 2 year period. ABPM data were analyzed to determine t he average 24-hour blood pressure (24-BP), the average blood pressure during the waking hours (Day-BP), and the average blood pressure from the time the subject went to bed until he awoke (Night-BP). ABPM measu rements were similar for Year 1, 2, and 3 (24-BP: Year 1; 1 30+/-10/79 +/-6 mmHg; Year 2; 130+/-10/79+/-7mmHg; and Year 3; 130+/-10/78 +/-7mm Hg). Bland-Altman analysis and standard deviation of the difference al so indicated the reproducibility of 24-BP was better than casual press ure. The 24-BP was significantly correlated with both Day-BP and Night -BP for each year. Day-BP showed the stronger correlation. Our results suggest that Day-BP provides reproducible estimation in subjects with borderline hypertension.