Relationship between defecation status and blood pressure level or blood pressure variability.

Blood pressure variability is an independent predictor of cardiovascular disease. Defecation status has also been associated with the risk of developing cardiovascular disease. This study aimed to investigate the association between blood pressure variability and defecation status. A total of 184 participants who could measure their home blood pressure for at least 8 days monthly, both at baseline and 1 year later, were included in this study. All participants had their home blood pressure measured using HEM-9700T (OMRON Healthcare). Day-to-day variability of systolic blood pressure was assessed using the coefficient of variation of home systolic blood pressure during 1 month. Data on defecation status was obtained using a questionnaire survey. Eighty-nine patients had an elevated coefficient of variation at 1 year. The proportion of participants with elevated coefficient of variation at 1 year was significantly higher in the no daily bowel movement group than in the daily bowel movement group (72% vs. 42%, P = 0.001). In multivariable logistic regression analysis with the elevated coefficient of variation at 1 year as the objective variable and age, sex, no daily bowel movement, taking medications, including antihypertensive drugs, laxatives, and intestinal preparations, and coefficient of variation at baseline as independent variables, no daily bowel movement was independently associated with the elevated coefficient of variation at 1 year (odds ratio: 3.81, 95% confidence interval: 1.64-8.87, P = 0.0019). In conclusion, no daily bowel movement was independently associated with elevated day-to-day blood pressure variability at 1 year. Relationship between defecation status and blood pressure level or blood pressure variability.