Long-term reproducibility and evaluation of seasonal influences on blood pressure monitoring

Giaconi, S; Palombo, Carlo; Genovesi-Ebert, A; Marabotti, C; Volterrani, Duccio; Ghione, S

doi:10.1097/00004872-198812040-00016

Cited by 33 publications

(20 citation statements)

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“…18 Thus, our observations may influence the decision to start antihypertensive therapy in patients undergoing dialysis. In addition, it is possible that for these patients the adjustment of anti-hypertensive medication should be carried out in summer and in the beginning of the cooler months.…”

Section: Discussionmentioning

confidence: 95%

“…[1][2][3][4][5][6] However, none of them showed this variation in patients with chronic renal failure. Thus, this is the first study to demonstrate that seasonal change in blood pressure is also observed in patients undergoing hemodialysis.…”

Section: Discussionmentioning

confidence: 99%

“…[1][2][3][4][5][6] Several reports have shown that both systolic and diastolic blood pressure are highest in winter. This pattern affects all ages, including children, 7,8 and the magnitude of this variation appears to increase with age.…”

Section: Introductionmentioning

confidence: 99%

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Seasonal variation of blood pressure in maintenance hemodialysis

Castro

Marcondes

et al. 1998

Sao Paulo Med. J.

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Context: Seasonal variation in arterial blood pressure has been reported in studies with hypertensive and normotensive subjects. However, the influence of seasonal change on blood pressure of hemodialysis patients has not been reported. Objective: To investigate the seasonal variation of blood pressure in Brazil, a tropical country, in patients on hemodialysis. Design: Prospective, cohort study. Setting: Dialysis unit of a tertiary medical center (a teaching hospital of the University of São Paulo School of Medicine, São Paulo). Patients: Sixteen patients with chronic renal failure undergoing hemodialysis. Outcomes: Blood pressure, body weight, and ambient temperature were evaluated during 6 hemodialysis sessions carried out on 13 days during the four seasons. Results: The diastolic blood pressure was lower in summer than in fall and winter (95 ± 8 vs 107 ± 10 and 101 ± 10 mmHg, respectively; p < 0.05). The same was observed with mean blood pressure (116 ± 8 vs 130 ± 11 and 124 ± 9 mmHg, respectively; p < 0.01). On the other hand, the ambient temperature was higher in summer than in fall and winter (23.0 ± 1.6 vs 19.5 ± 3.0 and 15.8 ± 1.9 ºC, respectively; p < 0.01). Conclusions: We concluded that for patients with chronic renal failure the blood pressure has a seasonal variation with higher pressures in fall and winter than in summer. Thus, further studies are needed to elucidate the impact of this observation on the adjustment of antihypertensive treatment and on morbidity and mortality in maintenance dialysis patients. Uniterms:Season. Blood pressure. Temperature. Chronic renal failure. Hemodialysis. Prospective cohort.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

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Seasonal variation of blood pressure in maintenance hemodialysis

Castro

Marcondes

et al. 1998

Sao Paulo Med. J.

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“…The latter started in midwinter, when BP levels are known to be highest. 14,15 The 5-week visit during the second study period occurred just before midsummer in the case of many …”

Section: Discussionmentioning

confidence: 99%

Effect of ingesting sour milk fermented using Lactobacillus helveticus bacteria producing tripeptides on blood pressure in subjects with mild hypertension

Lindström²,

et al. 2004

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Angiotensin-converting enzyme (ACE) is important in the regulation of blood pressure (BP). Two tripeptides that inhibit ACE, isoleucyl-prolyl-proline (Ile-Pro-Pro) and valyl-prolyl-proline (Val-Pro-Pro), have been isolated from certain sour milks. The aim of the study reported was to evaluate the effect on BP in subjects with mild hypertension of a new sour milk containing tripeptides. The initial number of subjects was 60 (36 men, 24 women). Among the criteria for inclusion in the study were systolic BP (SBP) between 140 and 180 mmHg and/or diastolic BP (DPB) between 90 and 110 mmHg, without antihypertensive drug therapy. There were two study periods with a washout period between. All subjects were given 1.5 dl per day of a placebo (regular sour milk) or of the active product, a milk that had been fermented with Lactobacillus helveticus bacteria and contained 2.4-2.7 mg of Ile-Pro-Pro and 2.4-2.7 mg of Val-Pro-Pro per 1.5 dl. In the first phase, SBP fell 16 mmHg from baseline in the active group, 2 mmHg more than in the placebo group (P ¼ 0.0668) and no difference in DBP (P ¼ 0.92). There was a statistically significant downward trend both in SBP and DBP (P ¼ 0.0001). During the second phase, SBP fell 11 mmHg in the active group (P ¼ 0.008). The reduction in SBP was significantly larger in active than placebo group (P ¼ 0.012). In the crossover analysis combining both phases, SBP fell on average 2.6715.9 mmHg more on the active product compared with the placebo product, but this difference was not statistically significant (P ¼ 0.3111). The difference in DBP, 1.078.3 mmHg between the two test products was not significant either (P ¼ 0.4431). In conclusion, the ingestion of sour milk fermented by L. helveticus bacteria and that containing ACE inhibitory tripeptides seems to lower BP modestly.

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“…Regarding the seasonal blood pressure change in normotensive subjects, Abdulla and Taka (8) demonstrated the higher systolic blood pressure in winter than in summer, whereas Hata et al (4) failed to show any seasonal difference in blood pressure. However, these studies evaluated seasonal differences based on casual blood pressure measurement, and only a few studies have examined the seasonal variation in blood pressure by using 24-h ambulatory blood pressure monitoring (10,11).…”

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confidence: 99%

Seasonal Variation in 24-h Blood Pressure Pattern of Young Normotensive Women.

Tsuchihashi¹,

Uezono²,

Abe³

et al. 1995

Hypertens Res

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To investigate the seasonal variations in ambulatory blood pressure patterns, 24-h blood pressure was measured every 15 minutes noninvasively in ten young normotensive women. Urine was collected every 4 hours. The examinations were repeated in spring, summer, autumn, and winter in a standardized living environment.The 24-h average systolic and diastolic blood pressures did not differ significantly among the seasons. Similarly, there were no significant differences in the average values of either daytime or nighttime blood pressure. In contrast, the average pulse rate during nighttime was significantly higher in winter than in summer (64 ± 2 beats/min vs. 59 ± 2 beats/min, p < 0.05). The variabilities of either blood pressure or pulse rate did not change significantly among the seasons. The mesors and acrophases of both systolic and diastolic blood pressures, determined by a single cosinor method, were not significantly different among the seasons. On the other hand, the acrophase of pulse rate appeared significantly later in winter (16:19) compared with those in spring (14:54), summer (14:42), and autumn (14:21). Urine volume and urinary excretion of norepinephrine were significantly greater in winter than in summer. These results indicate that the 24-h pattern of blood pressure is reproducible and shows no seasonal difference in young normotensive women. (Hypertens Res 1995; 18: 209-214)

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Long-term reproducibility and evaluation of seasonal influences on blood pressure monitoring

Cited by 33 publications

References 0 publications

Seasonal variation of blood pressure in maintenance hemodialysis

Seasonal variation of blood pressure in maintenance hemodialysis

Effect of ingesting sour milk fermented using Lactobacillus helveticus bacteria producing tripeptides on blood pressure in subjects with mild hypertension

Seasonal Variation in 24-h Blood Pressure Pattern of Young Normotensive Women.

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