Context
Serum cortisol may be associated with cardiovascular risk factors and mortality in patients undergoing coronary angiography, but previous data on this topic are limited and controversial.
Objective
We evaluated whether morning serum cortisol is associated with cardiovascular risk factors, lymphocyte subtypes and mortality.
Design and Setting
This is a prospective cohort study performed at a tertiary care centre in south-west Germany between 1997 and 2000.
Participants
We included 3052 study participants who underwent coronary angiography.
Main Outcome Measures
Primary outcome measures were cardiovascular risk factors, lymphocyte subtypes and all-cause and cardiovascular mortality.
Results
Serum cortisol was associated with an adverse cardiovascular risk profile, but there was no significant association with coronary artery disease or acute coronary syndrome. In a subsample of 2107 participants, serum cortisol was positively associated with certain lymphocyte subsets including CD16+CD56+ (natural killer) cells (p<0.001). Comparing the fourth versus the first serum cortisol quartile, the crude Cox proportional hazard ratios (with 95% confidence intervals) were 1.22 (1.00 to 1.47) for all-cause and 1.32 (1.04 to 1.67) for cardiovascular mortality, respectively. After adjustments for various cardiovascular risk factors, these associations were attenuated to 0.93 (0.76 to 1.14) for all-cause, and 0.97 (0.76 to 1.25) for cardiovascular mortality, respectively.
Conclusions
Despite significant associations with classic cardiovascular risk factors and natural killer cells, serum cortisol was no significant and independent predictor of mortality in patients referred to coronary angiography. These findings might reflect that adverse cardiovascular effects of cortisol could be counterbalanced by some cardiovascular protective actions.