Seasonal differences in diurnal blood pressure of hypertensive patients living in a stable environmental temperature

Fujiwara, Takuya; Kawamura, Minoru; Nakajima, Jun; Adachi, Toshiyuki; Hiramori, Katsuhiko

doi:10.1097/00004872-199512010-00044

Cited by 54 publications

(36 citation statements)

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“…Subjects were randomly assigned to one of the sequence of seasons: either winter to summer (group I) or summer to winter (group II). The measurements by ABPM, electrothermometer, pedometer, and urine collections were performed as previously reported (10). The subjects arrived at the clinic between 9:00 AM and 12:00 noon on a weekday (Monday to Thursday).…”

Section: Methodsmentioning

confidence: 99%

“…Only two prospective studies using ABPM have examined the factors affecting seasonal variation in BP in patients with essential hypertension. In one of these studies, Giaconi et al (9) suggested that environmental temperature is a causal factor in the seasonal variation of BP, because the outdoor temperature during ABPM was correlated with the difference in BP, although there was no correlation between the environmental temperature where each subject actually lived and the difference in BP (10). However, these two studies were small (22 and 25 subjects, respectively), and thus the conclusions that could be derived were limited.…”

Section: Introductionmentioning

confidence: 99%

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Body Height Is a Determinant of Seasonal Blood Pressure Variation in Patients with Essential Hypertension.

et al. 2000

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To determine the factors that affect seasonal variation in blood pressure (BP) in a fairly large number of patients with essential hypertension who stayed almost entirely indoors in a stable environmental temperature and who took a calcium channel blocker during the study. This prospective study of hypertensive patients was conducted during the summer and winter. BP was measured by ambulatory blood pressure monitoring; the indoor temperature was measured at the time of the BP measurement using an electrothermometer with the subject awake and indoors. Subjects comprised 38 men and 57 women. The subjects spent virtually the entire day indoors during both the summer (men, 22.1 ±1.6 h; women, 23.0±0.9 h) and winter (men, 23.0±0.9 h; women, 22.9±0.9 h). During the waking hours, the systolic/diastolic BPs were significantly higher during the winter than the summer. The differences were 8±9/4±5 mmHg in men and 5±11/2±6 mmHg in women; these values were not significantly different between men and women.No significant seasonal differences in BP during the sleeping hours were noted. There was a significant difference of approximately 6°C in the environmental temperature during waking hours, but there was no significant difference in urinary excretion of sodium or in exercise activity between the seasons. Only body height was significantly correlated with the winter increase in waking BP in both men and women, even after adjustment for potential confounding variables. Body height was a determinant of the increase in waking BP during the winter in hypertensive patients who lived almost entirely indoors.(Hypertens Res 2000; 23: 587-592)

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Body Height Is a Determinant of Seasonal Blood Pressure Variation in Patients with Essential Hypertension.

et al. 2000

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“…Blood sampling for PRAwas obtained after 30 minutes of standing. After sampling, 24-hour ambulatory blood pressure monitoring was performed as we reported previously (13). The same examinations were performed 2 weeks later during therapy.…”

Section: Case Reportmentioning

confidence: 99%

Effectiveness of 1,25-dihydroxyvitamin D Supplementation on Blood Pressure Reduction in a Pseudohypoparathyroidism Patient with High Renin Activity.

et al. 1999

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A 42-year-old manhad biochemical and somatic abnormalities compatible with pseudohypoparathyroidism type I (PsHP) and also had high plasma renin activity (PRA). After 1,25-dihydroxyvitamin D (calcitriol) supplementation the systolic/diastolic blood pressure, assessed by 24-hour non-invasive ambulatory blood pressure monitoring, was reduced from 145/96 mmHg to 128/85 mmHg with normalization of the serum calcium level and its related hormones, as well as decreased PRA. Calcitriol supplementation successfully reduced the blood pressure in this patient with PsHP and a high PRA, suggesting that calcium-related hormones and/or the renin-angiotensin system were involved in lowering the blood pressure. (Internal Medicine 38: 31-35, 1999)

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“…Previous studies have also reported a seasonal variation in casual, home and 24-h BP with a 2-4 mm Hg higher BP during winter, and a trend towards higher BP during winter was also found in our study. [32][33][34][35][36][37][38][39][40] However, no seasonal effect on BP response to change in dietary salt intake was found. Thus, salt sensitivity classification did not seem to be influenced by season.…”

Section: Methodology Of Salt Sensitivity Testingmentioning

confidence: 89%

Reproducibility of salt sensitivity testing using a dietary approach in essential hypertension

1999

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To investigate the reproducibility of salt sensitivity testing using a dietary approach, 30 essential hypertensive patients underwent salt sensitivity testing on an outpatient basis twice with a 6 month interval. At both tests casual and 24-h ambulatory blood pressure (24-h BP) was recorded on habitual diet, then after a 6-day period on a low salt diet (aiming at 50 mmol/day), and finally after a 6-day period on a high salt diet (supplementation with sodium chloride tablets aiming at 250 mmol/day). Subjects showing у10% increase in mean BP when changing from low to high dietary salt intake were classified as salt sensitive. Dietary salt intake was assessed as 24-h urinary sodium excretion. Based on 24-h BP recordings eight patients were characterised as salt sensitive (SS) and 22 as salt resistant (SR) in the first test, and three of the initial SS and 15 of the initial SR patients maintained their salt sensitivity status at the

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Seasonal differences in diurnal blood pressure of hypertensive patients living in a stable environmental temperature

Cited by 54 publications

References 0 publications

Body Height Is a Determinant of Seasonal Blood Pressure Variation in Patients with Essential Hypertension.

Body Height Is a Determinant of Seasonal Blood Pressure Variation in Patients with Essential Hypertension.

Effectiveness of 1,25-dihydroxyvitamin D Supplementation on Blood Pressure Reduction in a Pseudohypoparathyroidism Patient with High Renin Activity.

Reproducibility of salt sensitivity testing using a dietary approach in essential hypertension

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