Figure 1.

Patterns of laboratory testing in heart failure patients starting mineralocorticoid receptor antagonist therapy, overall and by the initial site of mineralocorticoid receptor antagonist prescription. Shown is the proportion of patients undergoing laboratory testing before (pre-) and after (post-)mineralocorticoid receptor antagonist initiation. Post-initiation testing is characterized as early (within 10 days) or extended (within 10–90 days). Appropriate monitoring denotes testing in all three studied intervals (pre, early, and extended).