Annular versus subvalvular approaches to acute ischemic mitral regurgitation

Tomasz A. Timek, David T. Lai, Frederick Tibayan, David Liang, Filiberto Rodriguez, George T. Daughters, Paul Dagum, Neil B. Ingels, Craig Miller

    Research output: Contribution to journalArticlepeer-review

    32 Scopus citations

    Abstract

    Background - Ischemic mitral regurgitation (IMR) has been attributed to annular dilatation, papillary muscle (PM) displacement ("apical leaflet tenting"), or both. We compared the efficacy of reducing annular or subvalvular dimensions to gain more mechanistic insight into acute IMR. Methods - Eight adult sheep underwent implantation of radiopaque markers on the LV, mitral annulus (MA), each leaflet edge, and each PM tip. Trans-annular septal-lateral (SL) and inter-PM tip sutures were placed and externalized. Biplane videofluoroscopy and transesophageal echocardiography were performed before and continuously during LCx occlusion-induced IMR with SL annular (SLAC) or inter-PM (PAPS) suture tightening (4 to 5 mm of cinching for 5 seconds during ischemia). MA SL dimension, inter-papillary distance (APM-PPM), and the distances between the anterior (APM) and posterior (PPM) PM tips and the mid-septal annulus ("saddle horn") were calculated from 3-D marker coordinates at end-systole. Results - SLAC reduced IMR (grade= 2.1±0.6 versus 0.7±0.5, P.001), SL annular diameter (4.9±2.5 mm smaller versus pre-cinching; P.001), and PM-"saddle horn" distances (0.9±0.7 and 1.0±0.8 mm reduction for APM and PPM, respectively; P.005). PAPS reduced APM-PPM distance (3.7±1.8 mm reduction versus precinching; P.001), only slightly decreased the PPM-"saddle horn" distance (0.3±0.3 mm reduction; P.03), and had no effect on IMR. Conclusions - Acute IMR was abolished by annular SL reduction, which also repositioned both PM tips closer to the mid-septal annulus and paradoxically increased leaflet "apical tenting"; reducing inter-papillary dimension was not effective, even though it displaced the leaflets toward the annular plane (less "apical tenting").

    Original languageEnglish (US)
    Pages (from-to)I27-I32
    JournalCirculation
    Volume106
    Issue number13 SUPPL.
    StatePublished - Sep 24 2002

    Keywords

    • Annular cinching
    • Coronary artery disease
    • Ischemic mitral regurgitation
    • Mitral annulus
    • Mitral regurgitation

    ASJC Scopus subject areas

    • Cardiology and Cardiovascular Medicine
    • Physiology (medical)

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