Long-term cardiovascular risk of white-coat hypertension with normal night-time blood pressure values.

BACKGROUND: The prognostic impact of white-coat hypertension (WCHT) is still a matter of debate and controversy. Night-time blood pressure (NBP) is related strongly to cardiovascular (CV) prognosis, but this has not been considered currently in the definition of WCHT. PATIENTS AND METHODS: We investigated the long-term CV prognosis of 2659 patients submitted at admission to 24 h-ambulatory blood pressure (BP) monitoring divided into three groups: normotension (NT) (n=812; 59% female; ageing 49±13 years), sustained hypertension (SHT) (n=1230; 56% female; ageing 51±13 years) and WCHT (n=617; 55% female; ageing 50±3 years) defined as office BP of at least 140/90 mmHg, daytime BP less than 135/85 mmHg and NBP less than 120/70 mmHg. RESULTS: The median follow-up was 7.6 years (range: 0.4-24.4), during which a total of 257 CV events (36 fatal) occurred (46% strokes, 32% coronary and 22% others), 38 in NT, 31 in WCHT and 188 in SHT. The event rate per 100 patient-years was 0.60 in the WCHT group, 0.66 in the NT group and 2.09 in the SHT group. Cox's regression analysis adjusted for covariables showed a higher risk of CV events in patients with SHT than WCHT [hazard ratio (HR)=2.230, 95% confidence interval: 1.339-3.716, P=0.002], whereas there was no difference between WCHT and NT groups. Event-free survival was significantly different from SH versus WCHT and NT groups. Within the group of WCHT, 29% of patients received sustained antihypertensive medication during the follow-up, but the HR of CV events between WCHT either treated or not treated did not differ: HR=0.76 (95% confidence interval: 0.37-1.51, P=0.42). CONCLUSION: In patients with WCHT defined by normal daytime and NBP values, the risk of CV events was significantly lower than that of SHT and similar to that of NT patients, suggesting that NBP should be included in the WCHT definition and in its prognostic stratification.

Prognostic role of masked and white-coat hypertension: 10-Year mortality in treated elderly hypertensives.

White-coat uncontrolled hypertension (WUCH) and masked uncontrolled hypertension (MUCH) are common in the elderly. The prognostic role of these hypertension phenotypes is not completely defined in this subpopulation. Our aim is to evaluate the long-term prognostic role of WUCH and MUCH in treated elderly hypertensives. Observational study conducted on 120 consecutive treated elderly hypertensives. Patients were assessed on a first clinical visit in 2006. Subsequently, such patients or their relatives have been recalled after 10 years to evaluate the survival rates. Main inclusion criteria at baseline: age ≥ 65 years, a previous diagnosis of essential hypertension, a valid 24-h ambulatory blood pressure monitoring (ABPM). All participants received anti-hypertensive drugs during the 10-year period and we considered 10-year mortality for the analysis. General characteristics at baseline: mean age was 71.2 ± 5.3 years; females were 53.3%; 15.1% of patients had sustained controlled hypertension (SCH), 35.8% had WUCH, 10.8% had MUCH and 38.3% had sustained uncontrolled hypertension (SUCH). Thirty-two patients (26.7%) died during the 10-year period. Deceased patients were older, had lower treatment intensity, HDLc levels and eGFR than survivors. After adjusting for these covariates, MUCH (HR 12.30, p < 0.001) and SUCH (HR 4.84, p = 0.007) were associated with higher risk of death, compared to SCH, while no relationship emerged with WUCH (HR 1.58, p = 0.455). In our real-life study on treated elderly hypertensives, MUCH was associated with higher risk of death, compared to SCH and SUCH, while WUCH was not. ABPM is a key tool to improve management and therefore prognosis in this subpopulation.

Ambulatory versus clinic blood pressure measurement - more evidence.

Review of: Banegas J et al. Relationship between clinic and ambulatory blood pressure measurements and mortality. New Engl J Med 2018; 378: 1509-20.

Prognostic value of average home blood pressure and variability: 19-year follow-up of the Didima study.

OBJECTIVE: The current general population study explored the prognostic value of home blood pressure (HBP) average and variability (BPV) versus office measurements (OBP). METHODS: In 1997, 665 adults of Didima, Argolida, Greece were evaluated with OBP (two visits, six readings) and HBP (3 days, 12 readings) measurements. Total mortality and cardiovascular morbidity and mortality (CVD) were assessed after 19.0 ±â€Š1.4 years. BPV was quantified by using SD and coefficient of variation. RESULTS: During follow-up, 216 deaths (124 cardiovascular) and 146 cardiovascular events (fatal and nonfatal) were documented. Hazard ratios for total mortality were 1.39/1.20 (P < 0.01/ < 0.01) per 10/5 mmHg increase in systolic/diastolic HBP and 1.36/1.02 (P < 0.01/NS) for OBP (similar hazard ratios for CVD). After adjustment for baseline risk factors, OBP and HBP lost their prognostic ability, except from diastolic OBP that predicted CVD (hazard ratio 1.10, P = 0.03). Sustained, masked and white-coat hypertension were associated with increased risk of death and CVD (P < 0.01 versus normotensive participants). After adjustment, the risk of death remained significant for all, but CVD only for white-coat hypertension. Systolic home BPV (not diastolic) predicted total mortality (adjusted hazard ratios 1.18/1.17 for 1-SD increase in SD/coefficient of variation; P < 0.05) and CVD. Unadjusted systolic/diastolic office BPV predicted CVD outcome (for total mortality only systolic), yet not after adjustment. Systolic home BPV predicted total mortality and CVD independent of office BPV. CONCLUSION: In this general population study with 19-year follow-up, average HBP predicted total mortality and CVD as reliably as OBP. Only normotension (low OBP and HBP) was associated with low risk. Systolic home BPV exhibited superior prognostic ability than OBP, deserving further research.

Long-term prognostic value of white coat hypertension: an insight from diagnostic use of both ambulatory and home blood pressure measurements.

The prognostic value of white coat hypertension (WCH) is still debated. In 2051 subjects representative of the general population of Monza, we measured office, ambulatory, and home blood pressure (BP). The risk of cardiovascular and all-cause mortality was assessed over 16 years in normotensive, sustained hypertensive, and WCH subjects, the last group being defined as usually done in clinical practice (ie, by normality of 1 out-of-office [ambulatory or home] BP with an office BP elevation). Compared with normotensive subjects, the risk of cardiovascular mortality, as adjusted for potential confounders, showed a progressive significant increase in WCH and sustained hypertensive subjects (2.04 and 2.94; P=0.006). In either group, a significant increase in adjusted risk was also seen for all-cause mortality. However, when the WCH group was subdivided into 2 subgroups, that is, subjects in whom both out-of-office BPs were normal (true WCH, 42%) or one BP was normal whereas the other was elevated (partial WCH, 58%), only the latter showed a significantly greater adjusted risk of cardiovascular and all-cause mortality (2.76 and 1.58; P<0.03). Compared with normotensive subjects, the partial WCH group also exhibited a marked increase in adjusted risk of developing sustained hypertension over a 10-year time period (2.58; P<0.0001), but in this case the risk was also increased in true WCH subjects (2.89; P<0.0001). Thus, WCH includes subjects with a widely different long-term risk of a cardiovascular event. To identify those at higher risk, measurements of both out-of-office BPs are desirable.

White coat hypertension is more risky than prehypertension: important role of arterial wave reflections.

Arterial aging may link cardiovascular risk to white coat hypertension (WCH). The aims of the present study were to investigate the role of arterial aging in the white coat effect, defined as the difference between office and 24-hour ambulatory systolic blood pressures, and to compare WCH with prehypertension (PH) with respect to target organ damage and long-term cardiovascular mortality. A total of 1257 never-been-treated volunteer subjects from a community-based survey were studied. WCH and PH were defined by office and 24-hour ambulatory blood pressures. Left ventricular mass index, carotid intima-media thickness, estimated glomerular filtration rate, carotid-femoral pulse wave velocity, carotid augmentation index, amplitude of the reflection pressure wave, and 15-year cardiovascular mortality were determined. Subjects with WCH were significantly older and had greater body mass index, blood pressure values, intima-media thickness, carotid-femoral pulse wave velocity, augmentation index, amplitude of the backward pressure wave, and a lower estimated glomerular filtration rate than PH. Amplitude of the backward pressure wave was the most important independent correlate of the white coat effect in multivariate analysis (model r(2)=0.451; partial r(2)/model r(2)=90.5%). WCH had significantly greater cardiovascular mortality than PH (hazard ratio, 2.94; 95% confidence interval, 1.09-7.91), after accounting for age, sex, body mass index, smoking, fasting plasma glucose, and total cholesterol/high-density lipoprotein-cholesterol ratio. Further adjustment of the model for amplitude of the backward pressure wave eliminated the statistical significance of the WCH effect. In conclusion, the white coat effect is mainly caused by arterial aging. WCH carries higher risk for cardiovascular mortality than PH, probably via enhanced wave reflections that accompany arterial aging.

Prognostic significance of masked and white-coat hypertension in the general population: the Finn-Home Study.

OBJECTIVE: The clinical significance of masked and white-coat hypertension is still somewhat controversial. The aim of the present study was to investigate the prognosis of masked and white-coat hypertension using home blood pressure (BP) measurement. DESIGN AND METHODS: A nationwide population sample (n = 2046, age 44-74 years) underwent office (duplicate measurements on one visit by a nurse) and home (duplicate measurements on 7 days) BP measurements and risk factor evaluation. During the follow-up of 7.5 years, 221 fatal and nonfatal cardiovascular events and 142 all-cause deaths occurred. Masked hypertension was defined as office BP less than 140/90 mmHg with home BP at least 135/85 mmHg. RESULTS: The prevalence of baseline risk factors and the incidence of cardiovascular events and all-cause deaths increased from normotension to white-coat, masked and sustained hypertension. Unadjusted hazard ratios for white-coat hypertension were 1.18 (P = 0.5) for cardiovascular events and 1.23 (P = 0.5) for all-cause deaths. Masked hypertension had a significantly higher age-adjusted risk of cardiovascular events and a higher risk of all-cause mortality after adjustment for age, sex and office BP than normotension (hazard ratios 1.64, P = 0.05, and 2.09, P = 0.01). Masked hypertension lost its predictive significance after adjustment for home BP or concomitant other cardiovascular risk factors. CONCLUSION: Neither masked nor white-coat hypertension was an independent predictor of cardiovascular risk or all-cause mortality when concomitant other risk factors or baseline home BP levels were taken into account. The present study suggests that home BP level, along with other traditional risk factors, may be enough to stratify cardiovascular risk.

Toward a definition of masked hypertension and white-coat hypertension among hemodialysis patients.

BACKGROUND AND OBJECTIVES: Among people with essential hypertension, ambulatory BP measurement is superior to BP obtained in the clinic in predicting cardiovascular outcomes. In part, this is because it can detect white-coat hypertension and masked hypertension. Whether the same is true for hemodialysis patients is not known. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: Using a threshold of 140/80 mmHg for median midweek dialysis-unit BP and 135/85 mmHg for 44-hour ambulatory BP, we defined four categories of BP: sustained normotension (SN), white-coat hypertension (WCH), masked hypertension (MHTN), and sustained hypertension (SHTN). RESULTS: Among 355 long-term hemodialysis patients, the prevalence of SN was 35%, WCH 15%, MHTN 15%, and SHTN 35%. Over a mean follow-up of 29.6 (SD 21.7) months, 102 patients died (29%), yielding a crude mortality rate of 121/1000 patient-years. Unadjusted and multivariate-adjusted analyses showed increasing all-cause mortality with increasing severity of hypertension (unadjusted hazard ratios from SN, WCH, MHTN, SHTN: 1, 1.12, 1.70, 1.80, respectively [P for trend < 0.01]; adjusted hazard ratios: 1, 1.30, 1.36, 1.87, respectively [P for trend 0.02]). When a predialysis BP threshold of 140/90 mmHg was used to classify patients into BP categories, the prevalence of SN was 24%, WCH 26%, MHTN 4%, and SHTN 47%. Hazard ratios for mortality were similar when compared with median midweek dialysis-unit BP. CONCLUSIONS: As in the essential hypertension population, MHTN and WCH have prognostic significance. The prognostic value of BP obtained in the dialysis unit can be refined with ambulatory BP monitoring.