The role of cardiac catheterization in solving the issue of surgical treatment of symptomatic hypertrophic cardiomyopathy

B.M. Todurov ^{1, 2}, M.B. Todurov ², A.V. Khokhlov ^{1, 2}, A.A. Kryvosheya ¹, L.R. Stetsiuk ¹, K.S. Boiko ^{1, 2}, M.V. Stan ^{1, 2},
V.S. Myronova ¹

¹Heart Institute of the Ministry of Health of Ukraine, Kyiv, Ukraine
²Shupyk National Healthcare University of Ukraine, Kyiv, Ukraine

Hypertrophic cardiomyopathy (HCM) is an underdiagnosed genetic heart disease with a prevalence of 0.2–0.5 %. Although the prognosis of HCM is relatively favorable, the annual overall mortality is about 0.7 %. The most common complication of HCM is obstruction of the left ventricular outflow tract (LVOT). Careful diagnosis and timely identification of high-risk patients by confirming the presence and degree of obstruction of the left ventricular outflow tract may reduce morbidity and mortality due to timely and correctly selected treatment. One-third of patients with HCM have echocardiographically confirmed LVOT obstruction at rest, and another third may have LVOT obstruction with provocation. Our clinical case demonstrates the presence of a small group of patients with HCM, whose LVOT obstruction is underestimated by transthoracic echocardiography (TTE) neither at rest nor when using provocative tests (Valsalva tests, exercise), and its hemodynamic significance is revealed only with invasive hemodynamic catheterization of the heart. Below, we illustrate the utility of hemodynamic catheterization as an adjunctive tool to echocardiography to help establish the presence, magnitude, and location of obstruction in patients with HCM in the absence of such data on TTE. In case of a high degree of suspicion that LVOT obstruction is responsible for refractory symptoms, catheterization can establish the presence of a hemodynamically significant LVOT gradient and, accordingly, without deviating from clinical recommendations, to carry out optimal surgical treatment, in our case – septal alcohol ablation with subsequent elimination of symptoms and restoration of the patient’s endurance to physical exertion.

Key words: hypertrophic cardiomyopathy, obstruction, left ventricular outflow tract, transthoracic echocardiography, hemodynamic catheterization, Bernoulli equation, continuous Doppler echocardiography

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