Prognostic value of different indices of blood pressure variability in hypertensive patients.
BACKGROUND
The independent prognostic significance of different indices of blood pressure (BP) variability is not clear. We investigated the prognostic value of BP variability estimated as s.d. or average real variability (ARV) of daytime and night time BP, in hypertensive patients.


METHODS
The occurrence of fatal and nonfatal cardiovascular events was evaluated in 1,280 sequential hypertensive patients (550 initially untreated and 730 initially treated) aged > or =40 years. Subjects with s.d. or ARV of daytime or night time systolic or diastolic BP below or above the median were classified as having low or high BP variability.


RESULTS
During the follow-up (4.75 +/- 1.8 years), 104 cardiovascular events occurred. The event rate per 100 patient-years was 1.71 in the global population. After adjustment for other covariates, Cox regression analysis showed that cardiovascular risk was higher in subjects with high ARV of daytime systolic BP in initially untreated, initially treated, and all the subjects (high vs. low ARV, hazard ratio (HR) 2.29 (1.06-4.94), HR 1.90 (1.06-3.39), and HR 2.07 (1.31-3.28), respectively). ARV of daytime diastolic BP and night time BP, and s.d. of daytime and night time BP were not significantly associated with risk or were not independent predictors of outcome.


CONCLUSIONS
In this study, high ARV of daytime systolic BP resulted in an independent predictor of cardiovascular risk in hypertensive patients, while high s.d. did not. Our data suggest that, in comparison to s.d., ARV could be a more appropriate index of BP variability and a more useful predictor of outcomes.
Pierdomenico
Sante D
SD
Dipartimento di Medicina e Scienze dell'Invecchiamento, Università Gabriele d'Annunzio, Chieti, Italy. pierdomenico@unich.it
Di Nicola
Marta
M
Esposito
Anna L
AL
Di Mascio
Rocco
R
Ballone
Enzo
E
Lapenna
Domenico
D
Cuccurullo
Franco
F
D000368:Aged; D000465:Algorithms; D000959:Antihypertensive Agents / Q000627:therapeutic use; D001794:Blood Pressure / Q000502:physiology*; D004452:Echocardiography; D005260:Female; D005500:Follow-Up Studies; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D006973:Hypertension / Q000188:drug therapy / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D011379:Prognosis; D012044:Regression Analysis
D000959:Antihypertensive Agents