What is wet beriberi?

Answer

Wet beriberi is the term used for thiamine deficiency with cardiovascular involvement. The chronic form of wet beriberi consists of 3 stages. In the first stage, peripheral vasodilation occurs, leading to a high cardiac output state. This leads to salt and water retention mediated through the renin-angiotensin-aldosterone system in the kidneys. As the vasodilation progresses, the kidneys detect a relative loss of volume and respond by conserving salt. With the salt retention, fluid is also absorbed into the circulatory system. The resulting fluid overload leads to edema of the dependent extremities.

By the time significant edema occurs, the heart has been exposed to a severely high workload in order to pump the required cardiac output needed to satisfy end organ requirements. Parts of the heart muscle undergo overuse injury, which results in the physical symptoms of tachycardia, edema, and high arterial and venous pressures. These changes can lead to myocardial injury, expressed as chest pain.

A more rapid form of wet beriberi is termed acute fulminant cardiovascular beriberi, or Shoshin beriberi. The predominant injury is to the heart, and rapid deterioration follows the inability of the heart muscle to satisfy the body's demands because of its own injury. In this case, edema may not be present. Instead, cyanosis of the hands and feet, tachycardia, distended neck veins, restlessness, and anxiety occur. Treatment with thiamine causes low-output cardiac failure, because systemic vasoconstriction is reinstated before the heart muscle recovers. Support of heart function is an added requirement at this stage, and recovery is usually fairly quick and complete if treatment is initiated promptly. However, if no treatment is available, death occurs just as rapidly (within hours or days).

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Beriberi in an adult patient.

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Author

Dieu-Thu Nguyen-Khoa, MD, FACP Associate Clinical Professor of Medicine, University of California, Los Angeles, David Geffen School of Medicine; Physician Specialist, Department of Primary Care and Community Medicine, ValleyCare Olive View-UCLA Medical Center

Dieu-Thu Nguyen-Khoa, MD, FACP is a member of the following medical societies: Alpha Omega Alpha, American College of Physicians, American Medical Association

Disclosure: Nothing to disclose.

Coauthor(s)

Ginette V Busschots, MD Assistant Professor, Department of Emergency Medicine, Foote Hospital, University of Michigan Medical School

Disclosure: Nothing to disclose.

Phyllis A Vallee, MD Associate Program Director, Department of Emergency Medicine, Henry Ford Hospital

Phyllis A Vallee, MD is a member of the following medical societies: American Academy of Emergency Medicine, American Medical Association, Michigan State Medical Society

Disclosure: Nothing to disclose.

Chief Editor

Romesh Khardori, MD, PhD, FACP Professor of Endocrinology, Director of Training Program, Division of Endocrinology, Diabetes and Metabolism, Strelitz Diabetes and Endocrine Disorders Institute, Department of Internal Medicine, Eastern Virginia Medical School

Romesh Khardori, MD, PhD, FACP is a member of the following medical societies: American Association of Clinical Endocrinologists, American College of Physicians, American Diabetes Association, Endocrine Society

Disclosure: Nothing to disclose.

Additional Contributors

Dennis W Cope, MD, FACP Emeritus Professor of Clinical Medicine, University of California, Los Angeles, David Geffen School of Medicine; Chief, Department of Internal Medicine, Olive View-UCLA Medical Center

Dennis W Cope, MD, FACP is a member of the following medical societies: Alpha Omega Alpha, American College of Physicians, Society of General Internal Medicine

Disclosure: Nothing to disclose.

Acknowledgements

Don S Schalch, MD Professor Emeritus, Department of Internal Medicine, Division of Endocrinology, University of Wisconsin Hospitals and Clinics

Don S Schalch, MD is a member of the following medical societies: American Diabetes Association, American Federation for Medical Research, Central Society for Clinical Research, and Endocrine Society

Disclosure: Nothing to disclose.

Francisco Talavera, PharmD, PhD Adjunct Assistant Professor, University of Nebraska Medical Center College of Pharmacy; Editor-in-Chief, Medscape Drug Reference

Disclosure: Medscape Salary Employment

Stanley Wallach, MD Executive Director, American College of Nutrition; Clinical Professor, Department of Medicine, New York University School of Medicine

Stanley Wallach, MD is a member of the following medical societies: American College of Nutrition, American Society for Bone and Mineral Research, American Society for Clinical Investigation, American Society for Clinical Nutrition, American Society for Nutritional Sciences, Association of American Physicians, and Endocrine Society

Disclosure: Nothing to disclose.

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