The Adequacy of Laboratory Monitoring in Patients Treated With Spironolactone for Congestive Heart Failure
Keyur B. Shah, MD*,
Krishnamurti Rao, BS
,
Robert Sawyer, MD
and
Stephen S. Gottlieb, MD, FACC
,*
* Department of Medicine, The University of Maryland School of Medicine and the Baltimore Veterans Affairs Medical Center, Baltimore, Maryland
Division of Cardiology, The University of Maryland School of Medicine and the Baltimore Veterans Affairs Medical Center, Baltimore, Maryland
Department of Otorhinolaryngology-Head and Neck Surgery, The University of Maryland School of Medicine and the Baltimore Veterans Affairs Medical Center, Baltimore, Maryland
Division of Cardiology, The University of Maryland School of Medicine and the Baltimore Veterans Affairs Medical Center, Baltimore, Maryland

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Figure 1 The laboratory monitoring follow-up of patients with heart failure started with spironolactone. One-third of the patients did not have serum potassium checked within three months of drug initiation.
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Figure 2 The incidence of hyperkalemia associated with various baseline serum creatinine concentrations. Note that even a modest increase in creatinine concentration increases the risk of hyperkalemia.
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Copyright © 2005 by the American College of Cardiology Foundation.