Dynamics of left ventricular apex rotation during angioplasty

A sensitive index of ischemic dysfunction

Merril L. Knudtson, P. Diane Galbraith, Kathy L. Hildebrand, John V. Tyberg, Rafael Beyar

Research output: Contribution to journalArticle

Abstract

Background: Apex rotation has been shown to provide a reliable index of the dynamics of left ventricular (LV) twist. In this study, we aimed to characterize twist at baseline and during acute ischemia in 20 patients undergoing percutaneous transluminal coronary angioplasty to the left anterior descending (LAD) artery and to test whether an old myocardial infarction or collateral flow affected twist dynamics. Methods and Results: Among patients with no previous infarction, five had no collaterals (group A) and six had angiographically visible collaterals (group B). Previous anterior infarction was present in nine patients (group C). Data were acquired with the LAD angioplasty wire passed beyond the apex using a view aligned with the LV long axis. Frame-by-frame dynamics of apex rotation were measured from the angular movement of the portion of the wire that traversed the apex. Aortic pressure recordings allowed precise temporal definition of the cardiac cycle. Dynamics of apex rotation were measured at fixed intervals until 60 seconds of occlusion and up to 60 seconds of reperfusion. In group A, counterclockwise apex rotation (twist) during ejection of -22.0±1.7°(mean±SEE) was followed by rapid clockwise rotation (untwist) during isovolumic relaxation. During 60 seconds of ischemia, maximum apex rotation decreased to -82±2.0°(P

Original languageEnglish (US)
Pages (from-to)801-808
Number of pages8
JournalCirculation
Volume96
Issue number3
StatePublished - Aug 5 1997
Externally publishedYes

Fingerprint

Angioplasty
Infarction
Ischemia
Coronary Balloon Angioplasty
Reperfusion
Arterial Pressure
Arteries
Myocardial Infarction

Keywords

  • Angioplasty
  • Collateral circulation
  • Ischemia
  • Myocardial infarction

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

Cite this

Knudtson, M. L., Galbraith, P. D., Hildebrand, K. L., Tyberg, J. V., & Beyar, R. (1997). Dynamics of left ventricular apex rotation during angioplasty: A sensitive index of ischemic dysfunction. Circulation, 96(3), 801-808.

Dynamics of left ventricular apex rotation during angioplasty : A sensitive index of ischemic dysfunction. / Knudtson, Merril L.; Galbraith, P. Diane; Hildebrand, Kathy L.; Tyberg, John V.; Beyar, Rafael.

In: Circulation, Vol. 96, No. 3, 05.08.1997, p. 801-808.

Research output: Contribution to journalArticle

Knudtson, ML, Galbraith, PD, Hildebrand, KL, Tyberg, JV & Beyar, R 1997, 'Dynamics of left ventricular apex rotation during angioplasty: A sensitive index of ischemic dysfunction', Circulation, vol. 96, no. 3, pp. 801-808.
Knudtson ML, Galbraith PD, Hildebrand KL, Tyberg JV, Beyar R. Dynamics of left ventricular apex rotation during angioplasty: A sensitive index of ischemic dysfunction. Circulation. 1997 Aug 5;96(3):801-808.
Knudtson, Merril L. ; Galbraith, P. Diane ; Hildebrand, Kathy L. ; Tyberg, John V. ; Beyar, Rafael. / Dynamics of left ventricular apex rotation during angioplasty : A sensitive index of ischemic dysfunction. In: Circulation. 1997 ; Vol. 96, No. 3. pp. 801-808.
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