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CLINICAL STUDY

Utility of metabolic exercise testing in distinguishing hypertrophic cardiomyopathy from physiologic left ventricular hypertrophy in athletes

^a St. George’s Hospital Medical School, London, United Kingdom
^* University of Wolverhampton, Walsall Campus, Walsall, United Kingdom

Manuscript received July 29, 1999; revised manuscript received February 22, 2000, accepted April 11, 2000.

Reprint requests and correspondence: Dr. Sanjay Sharma, Department of Cardiological Sciences, St. George’s Hospital Medical School, Cranmer Terrace, London SW17 ORE, United Kingdom
ssharma21{at}hotmail.com

OBJECTIVES

This study evaluated the role of metabolic (cardiopulmonary gas exchange) exercise testing in differentiating physiologic LVH in athletes from HCM.

BACKGROUND

Regular intensive training may cause mild increases in left ventricular wall thickness (LVWT). Although the degree of left ventricular hypertrophy (LVH) is typically less than that seen in hypertrophic cardiomyopathy (HCM), genetic studies have shown that a substantial minority of patients with HCM have an LVWT in the same range. The differentiation of physiologic and pathologic LVH in this "gray zone" can be problematic using echocardiography and electrocardiography alone.

METHODS

Eight athletic men with genetically proven HCM and mild LVH (13.9 ± 1.1 mm) and eight elite male athletes matched for age, size and LVWT (13.4 ± 0.9 mm) underwent symptom limited metabolic exercise stress testing. Peak oxygen consumption (pVO₂), anaerobic threshold, oxygen pulse and respiratory exchange ratios were measured in both groups and compared with those observed in 12 elite and 12 recreational age- and size-matched athletes without LVH.

RESULTS

Elite athletes with LVH had significantly greater pVO₂ (66.2 ± 4.1 ml/kg/min vs. 34.3 ± 4.1 ml/kg/min; p < 0.0001), anaerobic threshold (61.6 ± 1.8% of the predicted maximum VO₂ vs. 41.4 ± 4.9% of the predicted maximum VO₂; p < 0.001) and oxygen pulse (27.1 ± 3.2 ml/beat vs. 14.3 ± 1.8 ml/beat; p < 0.0001) than individuals with HCM. A pVO₂ >50 ml/kg/min or >20% above the predicted maximum VO₂ differentiated athlete’s heart from HCM.

CONCLUSIONS

Metabolic exercise testing facilitates the differentiation between physiologic LVH and HCM in individuals in the "gray zone."

Abbreviations and Acronyms   AT = anaerobic threshold   A-V = systemic arteriovenous oxygen difference   BP = blood pressure   ECG = electrocardiogram   HCM = hypertrophic cardiomyopathy   HR = heart rate   LV = left ventricular   LVH = left ventricular hypertrophy   LVWT = left ventricular wall thickness   O2P = oxygen pulse   pVO2 = peak oxygen consumption   RER = respiratory exchange ratio   SV = stroke volume   VCO2 = carbon dioxide production   VO2 = oxygen consumption   VO2 max = maximal oxygen consumption

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