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Titolo:
Prediction of contractile reserve by cyclic variation of integrated backscatter of the myocardium in patients with chronic left ventricular dysfunction
Autore:
Muro, T; Ota, T; Watanabe, H; Teragaki, M; Takeuchi, K; Yoshikawa, J;
Indirizzi:
Osaka City Univ, Dept Internal Med 1, Abeno Ku, Osaka 5458585, Japan OsakaCity Univ Osaka Japan 5458585 ed 1, Abeno Ku, Osaka 5458585, Japan
Titolo Testata:
HEART
fascicolo: 2, volume: 85, anno: 2001,
pagine: 165 - 170
SICI:
1355-6037(200102)85:2<165:POCRBC>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
ULTRASONIC TISSUE CHARACTERIZATION; IDIOPATHIC DILATED CARDIOMYOPATHY; CORONARY-ARTERY DISEASE; DOBUTAMINE ECHOCARDIOGRAPHY; DEPENDENT VARIATION; ACOUSTIC PROPERTIES; STUNNED MYOCARDIUM; VIABLE MYOCARDIUM; BYPASS-SURGERY; HUMAN HEARTS;
Keywords:
contractile reserve; acoustic properties of myocardium; cyclic variation of integrated backscatter; left ventricular dysfunction;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Muro, T Osaka City Univ, Dept Internal Med 1, Abeno Ku, 1-4-3 Asahi Machi,Osaka 5458585, Japan Osaka City Univ 1-4-3 Asahi Machi Osaka Japan 5458585 8585, Japan
Citazione:
T. Muro et al., "Prediction of contractile reserve by cyclic variation of integrated backscatter of the myocardium in patients with chronic left ventricular dysfunction", HEART, 85(2), 2001, pp. 165-170

Abstract

Objective-To clarify whether assessment of the acoustic properties of the myocardium at rest can predict contractile reserve in patients with chronicleft ventricular dysfunction. Methods-23 patients (mean (SD) age 63 (12) years) with chronic left ventricular dysfunction were studied. The magnitude of cardiac cycle dependent variation of integrated backscatter (CVIB) of the myocardium was measured at rest in the basal and mid segment of the septum and posterior wall of the left ventricle, using a real time two dimensional integrated backscatter imaging system. The results were compared with the percentage wall thickening and the wall motion at rest and during low dose dobutamine infusion. The wall motion was graded as normal, hypokinetic, or akinetic and contractile reserve was considered present when an akinetic or hypokinetic segment improved during dobutamine infusion. Results-The CVIB at rest correlated with per cent wall thickening at rest and during dobutamine infusion (at rest, r = 0.61,p < 0.0001, during dobutamine, r = 0.76, p < 0.0001). Of the 76 segments examined, 27 showed contractile reserve. The mean CVIB at rest was significantly greater in segments with contractile reserve than in those without (p < 0.0001). CVIB above 3 dBat rest predicted segments with contractile reserve with a sensitivity andspecificity of 81% and 60%, respectively (p < 0.0001). Conclusions-CVIB reflected not only myocardial contractility but also the functional capacity of the myocardium. It predicted segmental contractile reserve in patients with chronic left ventricular dysfunction.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/01/20 alle ore 10:41:20