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[Prognostic value of exercise parameters and simple non-invasive variables of left ventricular function in dilated
1Haynal Imre Egészségtudományi Egyetem, II. Belgyógyászati Klinika, Budapest.
Insights
Simple, non-invasive tests can predict survival in dilated cardiomyopathy patients. Maximal exercise capacity and pulmonary capillary wedge pressure are key prognostic indicators for improved patient outcomes.
Area of Science:
- Cardiology
- Heart Failure Research
- Non-invasive Diagnostics
Context:
- Dilated cardiomyopathy (DCM) is a significant cause of heart failure.
- Prognostic markers are crucial for managing DCM patients.
- Routine non-invasive parameters are often underutilized for predicting outcomes.
Purpose:
- To evaluate the prognostic value of simple, routinely used non-invasive parameters in patients with dilated cardiomyopathy.
- To identify key predictors of survival in this patient population.
Summary:
- Fifty DCM patients (mean NYHA class 2.3) were assessed using exercise tests and echocardiography over a 24-month follow-up.
- Maximal exercise capacity, heart rate, systolic blood pressure, rate-pressure product, fractional shortening, and pulmonary capillary wedge pressure were analyzed.
- Except for fractional shortening, all tested parameters significantly correlated with survival.
- One-way analysis identified maximal exercise capacity, rate-pressure product, systolic blood pressure, and pulmonary capillary wedge pressure as strongest predictors.
- Multivariate analysis revealed additive prognostic value for rate-pressure product and pulmonary capillary wedge pressure, achieving the highest prediction accuracy.
Impact:
- This study highlights the prognostic utility of readily available non-invasive measures in DCM.
- Findings suggest that incorporating exercise capacity and pulmonary capillary wedge pressure into risk stratification can enhance clinical decision-making.
- The results support the use of these parameters for predicting survival and optimizing treatment strategies in dilated cardiomyopathy.
Abstract:
Authors assessed the prognostic value of some simple, routinely used non-invasive parameters in dilated cardiomyopathy. Fifty patients, 43 male and 7 female, mean NYHA class 2.3, treated with digitalis, diuretics and vasodilators, were tested. Mean follow up time was 24 months. The evaluated parameters were as follows: maximal exercise capacity, heart rate, systolic blood pressure, as well as rate-pressure product at peak exercise, their increase during the test, fractional shortening measured by M-mode echocardiography, mean pulmonary capillary wedge pressure estimated by apexcardiography and clinical grade of heart failure (NYHA class). Exercise test was multistage, symptom limited, maximal upright bicycle ergometer test. Both one-way and multivariate analysis showed that except of fractional shortening all of the evaluated parameters related significantly to the survival. According to the one-way analysis maximal exercise capacity, rate-pressure product and systolic blood pressure at peak exercise as well as the estimated value of mean pulmonary capillary wedge pressure proved to be the strongest prognosticators. Multivariate analysis showed that the prognostic value of the rate-pressure product at peak exercise and that of the estimated mean pulmonary capillary wedge pressure proved to be additive, their combined consideration resulted in the highest accuracy of prediction.