[Usefulness of the Doppler index delta P/delta t in the evaluation of left ventricular systolic dysfunction].
| Autor: | Alvarez López M; Servicio de Cardiología, Hospital Virgen de las Nieves, Granada., Alcalá López JE, Baún Mellado O, Tercedor Sánchez L, Ramírez Hernández JA, Rodríguez Padial L, Azpitarte Almagro J |
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| Jazyk: | Spanish; Castilian |
| Zdroj: | Revista espanola de cardiologia [Rev Esp Cardiol] 1997 Feb; Vol. 50 (2), pp. 105-10. |
| DOI: | 10.1016/s0300-8932(97)73187-7 |
| Abstrakt: | Introduction and Objectives: It has been shown that the delta P/delta t index, derived from the continuous Doppler mitral regurgitation signal correlates strongly with dP/dt. This study evaluates the feasibility, reproducibility and correlation of the index with ejection fraction and other conventional echocardiographic parameters. Material and Methods: One hundred and ten patients with mitral regurgitation demonstrated by colour Doppler were studied. delta P/delta t were calculated by the ratio between the interval of pression between two points of the Doppler signal (-1 and -3 m/s; 32 mmHg, applying the modified Bernouilli equation) and the interval of time (s) which separates both. Ejection fraction was measured in 70 patients by non-echocardiographic methods (isotopic ventriculography, n = 52, and angiography, n = 18). Results: The index was feasible in 91 cases, the variability of intra and interobserver was 5% and 7% respectively. The correlation between delta P/delta t and ejection fraction was significant although weak (r = 0.59; p < 0.001; n = 70). It was better in the group of dilated idiopathic myocardiopathy (r = 0.72; p < 0.001; n = 18) than in the group of myocardial infarction (r = 0.54; p < 0.01; n = 25). No significant correlation was founded in the cases with mitral rheumatic valvulopathy. Regarding to the echocardiographic parameters, the best correlation was obtained with end systolic diameter (r = -0.64; p < 0.001; n = 49). Finally, a value of delta P/delta t < 1,000 mmHg/s predicted the existence of left ventricular systolic dysfunction with high accuracy (84%), sensitivity (80%) and specificity (92%). Conclusions: High feasibility when mitral regurgitation exists, adequate reproducibility and heightened precision in diagnosing left ventricular systolic dysfunction, are characteristics which make delta P/delta t useful in the echocardiographic routine practice. |
| Databáze: | MEDLINE |
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