Summary
A theoretical equation was derived based on the time-varying elastance model to predict theoretically the relationship between the delay in the onset of left ventricular outflow obstruction and the reduction in peak left ventricular pressure (LVP) caused by treatment in hypertrophic obstructive cardiomyopathy (HOCM). ECG, LVP, and other hemodynamic parameters were measured during catheterization at a constant heart rate with atrial pacing in 16 patients with HOCM before and after intravenous administration of disopyramide (1 mg/kg). After disopyramide administration, the duration between the R wave of the ECG and the onset of obstruction (T 1) was prolonged significantly (from 117 ± 30 to 155 ± 32 ms,P < 0.0001), and peak LVP was reduced significantly (from 222 ± 42 to 177 ± 39 mmHg,P < 0.0001). The relation between the prolongation ofT 1 and the percent reduction in peak LVP was predicted well by the theoretical equation (coefficient of determinationR 2 = 0.926). Our model simplifies the therapeutic strategy for reducing the left ventricular outflow pressure gradient in patients with HOCM, which is to delay the time of onset of obstruction by some methods.
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K.N. and M.S. were supported by Grants-in-Aid for Scientific Research (C)(2)-096707762 and (C)(2)-09680866 from the Ministry of Education, Science, Sports and Culture of Japan. M.S. is grateful for the support of Nakatani Electronic Measuring Technology Association of Japan.
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Niki, K., Sugawara, M., Tanino, S. et al. An equation to predict the changes in peak left ventricular pressure in hypertrophic obstructive cardiomyopathy after treatment: Application to the administration of disopyramide. Heart Vessels 14, 72–81 (1999). https://doi.org/10.1007/BF02481746
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DOI: https://doi.org/10.1007/BF02481746