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Seasonal blood pressure and body weight variation in patients on chronic hemodialysis.

Abstract：

AIM:The relation of ambient temperature (AMT) and relative humidity to systolic blood pressure (SBP), diastolic blood pressure (DBP), body weight (BW), and body weight gain between dialysis sessions (DeltaBW) was examined in hemodialysis patients by Fourier analysis. METHODS AND RESULTS:The authors recruited 144 dialysis patients from a hemodialysis center in Okinawa, Japan where there is distinct seasonal variation in monthly AMT but a constant intradiurnal temperature change throughout the year. All patients had been undergoing chronic and regular hemodialysis three times per week. SBP, DBP, and BW before dialysis sessions and DeltaBW were recorded in 1994. Mean monthly Okinawa AMT in 1994 was highest in August and lowest in February and March, and the mean monthly relative humidity in 1994 was highest in June and lowest in January. Mean SBP and DBP were lowest in August and June respectively, and greatest in December. BW was lowest in July and September, and greatest in February and March; DeltaBW was lowest in July and greatest in January. These seasonal patterns were well reproduced by the first Fourier component. The cross-correlation coefficient showed that monthly mean AMT and SBP, DBP, BW, and DeltaBW were correlated with a lag time of 5 or 6 months. The cross correlation coefficient showed that relative humidity and SBP, DBP and DeltaBW were also correlated with a 6-month lag time. In analyzing subgroups of patients according to the presence or absence of antihypertensive medications, a seasonal change was observed in the SBP and DBP of patients not being treated with antihypertensives, and in the DBP of patients taking antihypertensive medications, but not in the SBP of patients taking antihypertensive medications. CONCLUSION:Seasonal variations in SBP, DBP, BW and DeltaBW were evident. AMT and the relative humidity correlated strongly with SBP, DBP, BW and DeltaBW. The clinical implications of these findings in hemodialysis patients warrant further investigation.

journal_name

Am J Nephrol

journal_title

American journal of nephrology

authors

Tozawa M,Iseki K,Iseki C,Morita O,Yoshi S,Fukiyama K

doi

10.1159/000013538

subject

Has Abstract

pub_date

1999-01-01 00:00:00

pages

660-7

issue

eissn

0250-8095

issn

1421-9670

pii

13538

journal_volume

pub_type

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Seasonal blood pressure and body weight variation in patients on chronic hemodialysis.