Controversy still exists about the long-term cardiovascular effects of coffee consumption in hypertension.

Methods

The predictive capacity of coffee use for cardiovascular events (CVEs) was investigated in 1204 participants from the HARVEST, a prospective cohort study of non-diabetic subjects aged 18–45 years, screened for stage 1 hypertension. Subjects were grouped into three categories of coffee drinking, non-drinkers (none), moderate drinkers (1 to 3 cups/day) and heavy drinkers (4 or more cups/day). Multivariate Cox proportional hazards models were developed adjusting for possible confounding variables and risk factors.

Results

During a median follow-up of 12.6 years, CVEs were developed by 60 participants. CVEs were more common among coffee drinkers than abstainers (abstainers, 2.2%; moderate drinkers, 7.0%; heavy drinkers, 14.0%; p for trend = 0.0003). In a multivariable Cox regression model, coffee use was a significant predictor of CVE in both coffee categories, with a hazard ratio of 2.8 (95% CI, 1.0–7.9) in moderate coffee drinkers and of 4.5 (1.4–14.2) in heavy drinkers compared to abstainers. After inclusion of change in body weight (p = ns), incident hypertension (p = 0.027) and presence of diabetes/prediabetes (p = ns) at follow-up end, the association with CVE was attenuated but remained significant in heavy coffee drinkers (HR, 95% CI, 3.4, 1.04–11.3).

Conclusions

These data show that coffee consumption increases the risk of CVE in a linear fashion in hypertension. This association may be explained in part by the association between coffee and development of hypertension. Hypertensive patients should be discouraged from drinking coffee.

http://www.internationaljournalofcardiology.com/article/S0167-5273(16)30417-X/fulltext