Day-to-day variation in day-night ratio of blood pressure
| Authors | |
|---|---|
| Year of publication | 2019 |
| Type | Article in Proceedings |
| Conference | Noninvasive methods in cardiology 2019 |
| MU Faculty or unit | |
| Citation | |
| Web | https://is.muni.cz/do/med/noninvasive_methods_in_cardiology/noninvasive_methods_in_cardiology_2019.pdf |
| Description | Ambulatory blood pressure monitoring (ABPM) is too often limited to only 24 hours. Too often, the data thus collected are analyzed by computing daytime, nighttime, and 24-hour means rather than assessing the circadian variation by cosinor. The day-night ratio (DNR) based on these mean values is then used for a classification in terms of “dipping”. Earlier work showed the large day-today variability in the circadian pattern of blood pressure (BP) observed in both normotensive and hypertensive individuals. Using data from the Brno database of 7-day/24-hour ABPM records, the extent of reproducibility of a classification in terms of “dipping” is examined herein by comparing results obtained on a daily basis versus those based on the entire record, used as reference. The percentage agreement for systolic (S) and diastolic (D) BP averaged (mean ± SE) 54.43 ± 1.37% and 59.09 ± 1.74%, respectively. Individually, the range in daily DNR values averaged 19.85 ± 0.58 and 26.48 ± 0.87 for SBP and DBP, respectively. These results suggest that the DNR computed from a 24-hour ABPM is not sufficiently reliable. |