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ȣ - 490038 77 |
| Usefulness of Electronic Activity Measurement in 24-hour Ambulatory Blood Pressure Monitoring
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| 충북대학교병원 순환기내과¹ , 충북대학교병원 의공학과² |
| 한혜숙¹, 김동운¹, 진계환², 이태수², 배장환¹, 황경국¹, 조명찬¹ |
Background and Objectives: The overriding influence of activity and diurnal variation in ambulatory blood pressure monitoring (ABPM) was well demonstrated. We prospectively evaluated the usefulness of electronic activity monitor in deriving actual activity and diurnal variation on ABPM. Subjectives and Methods: 24-hour ABPM with electronic activity monitor was performed on ten normotensive volunteers and fifteen hypertensives. Activity values were quantified by transverse and longitudinal MAD (mean of absolute difference) of accelerometer in electronic activity monitor. Ten normotensive volunteers performed four activities – running, walking, sitting and sleeping at 30-min intervals. To interpret ABPM results of fifteen hypertensives, we obtained actual awake/sleep periods of every subjects using an electronic activity monitor instead of using arbitrary day/nighttime periods. Results: Quantified total activity values (MAD) of hypertensives were of very wide range. Activity values obtained ten normotensive volunteers correlated well with four activity degree, blood pressure and heart rate. Nocturnal BP derived by the actual period was significantly lower than that derived by the arbitrary period (130±16/81±13 mmHg versus 124±13/77±12 mmHg, p<0.05). Nocturnal BP fall derived by the actual period was significantly larger than that derived by the arbitrary period (14.9±8.7/11.6±7.5 mmHg versus 21.1±8.6/16.2±7.4 mmHg, p<0.01). Out of 7 non-dippers (nocturnal BP reduction < 10%) determined by the arbitrary period, 4 were classified as dippers when actual period was used. One out of 13 hypertensives (24-hour mean BP ≥ 135/85 mmHg or daytime BP ≥ 140/90 mmHg or nighttime BP ≥ 125/75 mmHg) determined by the arbitrary period was also classified as a non-hypertensive. Conclusion: In this study, we could quantify activity values by electronic activity monitor. And interpretation of ABPM may be altered by the use of actual awake/sleep periods obtained by electronic activity monitor. These results suggest that accuracy and reproducibility of 24-hour ABPM will be improved by using electronic activity monitor.
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