Cortisol and testosterone in hair as biological markers of systolic heart failure.

BACKGROUND Congestive heart failure (CHF) is associated with increased stress and alterations in metabolism, favoring catabolism over anabolism. Hormonal profiles of patients with heart failure have been assessed using serum and saliva as matrices, which are only point measurements and do not provide long-term information. Scalp hair is a novel matrix that allows for measurement of hormones over a period of several months. PATIENTS AND METHODS We aimed to evaluate whether levels of cortisol and testosterone and their ratio (C/T) in hair correlate with severity of heart failure. We conducted a prospective study in ambulatory male patients with a left ventricular ejection fraction (LVEF)≤40%. Hormone levels were measured using immunoassays in the proximal 2 cm of hair (representing approximately two months of systemic hormone exposure). Primary endpoints included the correlation of hair cortisol, testosterone, and C/T levels with the New York Heart Association (NYHA) class, LVEF, exercise capacity and NT-proBNP. RESULTS The 44 CHF patients had a median hair level (range) of cortisol of 207 (117.7-1277.3)ng/g. Hair cortisol levels correlated positively with NYHA class (r=0.48, p=0.001) and negatively with treadmill stress test performance, (r=-0.37, p<0.05). The hair testosterone was 5.17 (2.39-24.64)ng/g and the C/T ratio was 39.89 (12.98-173.73). No associations were found between hair testosterone and C/T ratio and heart failure severity; however, the C/T ratio was higher in patients who required a CHF-related hospitalization than in patients who did not require this in the year following the inclusion in the study. CONCLUSIONS Hair cortisol levels correlate with heart failure severity as assessed by the NYHA class and exercise capacity, while hair testosterone and C/T levels do not correlate with heart failure severity.