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High output heart failure — Clinical Guidelines

Overview

High output heart failure occurs when the heart must pump significantly more blood than normal to meet metabolic demands, often seen in conditions like anemia, hyperthyroidism, or severe anemia, leading to symptoms despite preserved ejection fraction. 4

Diagnosis

Clinical Presentation: Symptoms include dyspnea, fatigue, and fluid retention despite normal or elevated ejection fraction. 4

Laboratory Tests: Elevated cardiac biomarkers, complete blood count (CBC) for anemia, thyroid function tests. 4

Echocardiography: To assess cardiac structure and function, excluding restrictive cardiomyopathy. 4

Cardiac MRI: Useful for detailed assessment of myocardial function and volume status. 4

Management

Address Underlying Cause: Treat anemia with iron supplementation or erythropoietin, manage hyperthyroidism with antithyroid medications. 4

Diuretics: Furosemide or bumetanide for fluid retention, dose adjusted based on response. 4

Vasopressors: In severe cases, consider inotropic support like dobutamine, though evidence is limited. 4

Monitoring: Regular assessment of weight, electrolytes, and renal function. 4

Special Populations

Elderly: Increased susceptibility to complications; careful titration of diuretics and close monitoring essential. 4

Comorbidities: Management must consider coexisting conditions like hyperthyroidism or chronic kidney disease, adjusting treatments accordingly. 4

Key Recommendations

Identify and treat the underlying cause (e.g., anemia, hyperthyroidism) to alleviate high cardiac output demands. (Evidence: Strong 4)

Use diuretics judiciously to manage fluid retention, monitoring for electrolyte imbalances and renal function. (Evidence: Moderate 4)

Consider inotropic support in severe cases with close clinical monitoring, acknowledging limited evidence. (Evidence: Weak 4)

References

1 Fernandez-Fernandez J, Ulbricht A, Ferrauti A. Fitness testing of tennis players: how valuable is it?. British journal of sports medicine 2014. link 2 Buckolz E, Prapavesis H, Fairs J. Advance cues and their use in predicting tennis passing shots. Canadian journal of sport sciences = Journal canadien des sciences du sport 1988. link 3 Wells CL, Schrader TA, Stern JR, Krahenbuhl GS. Physiological responses to a 20-mile run under three fluid replacement treatments. Medicine and science in sports and exercise 1985. link 4 Myhre LG, Hartung GH, Tucker DM. Plasma volume and blood metabolites in middle-aged runners during a warm-weather marathon. European journal of applied physiology and occupational physiology 1982. link

High output heart failure