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Comparison of the Tei index with invasive measurements of right ventricular function.

Abstract：

:The Doppler-derived Tei index has been reported to be clinically useful in assessing global right ventricular function. It could increase in response to combinations of increased pulmonary artery pressure and/or ventricular dysfunction. We compared the Tei index with invasive measurements of right ventricular function during acute pulmonary hypertension. Right and left ventricular pressures, pulmonary and aortic pressures, pulmonary flow and right ventricular volume by sonomicrometry were measured in six anaesthetized sheep. Graded pulmonary arterial hypertension was induced by a mechanical occlusion maneuver. Pressure-volume loops were generated during preload reduction through caval occlusion. Epicardial echocardiograms were also performed. Invasive indexes including preload recruitable stroke work, ventricular diastolic time constant and stiffness constant, and cardiac output were assessed, as were noninvasive echocardiographic indexes including Tei index and E/A ratio. The right ventricular pressure-volume loop became rectangular, with well-defined isovolumic phases. The slope of preload recruitable stroke work was increased significantly during pulmonary pressure of 30 mm Hg. The ventricular time constant showed a significant increase with no change of chamber stiffness during pulmonary pressure of 35 mm Hg. Concomitantly, the Tei index increased significantly from 0.06+/-0.03 to 0.31+/-0.06, together with the shortening of the ejection time and a decrease of the E/A ratio (P<0.05). Thus, the right ventricular Tei index was noted to be affected by acute graded afterload increase. The alteration in invasive measurements of systolic and diastolic function makes the Tei index a sensitive indicator of right ventricular dysfunction in the settings of acute pulmonary hypertension.

journal_name

Int J Cardiol

journal_title

International journal of cardiology

authors

Grignola JC,Ginés F,Guzzo D

doi

10.1016/j.ijcard.2005.10.012

subject

Has Abstract

pub_date

2006-10-26 00:00:00

pages

25-33

issue

1

eissn

0167-5273

issn

1874-1754

pii

S0167-5273(05)01283-0

journal_volume

113

pub_type

杂志文章

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