Evaluation of regional load in acute ischemia by three-dimensional curvatures analysis of the left ventricle

J. Lessick, S. Sideman, H. Azhari, E. Shapiro, J. L. Weiss, R. Beyar

Research output: Contribution to journalArticlepeer-review

Abstract

Geometric remodeling of the left ventricle (LV) following myocardial infarction and ischemic insult is associated with myocardial load redistribution. Regional curvatures based on 3-D reconstructions of the LV are used to calculate the regional loads. The technique uses surface normals to derive local circumferential and meridional curvatures. Following the validation of the procedure on simple geometric shapes, the effect of acute ischemia on the regional load redistribution was studied in six open chest dogs. Short axis magnetic resonance imaging (MRI) scans were used to reconstruct end-diastolic (ED) and end-systolic (ES) LV images by applying our helical shape descriptor, before and after acute coronary occlusion. Regional curvatures as well as local wall thickness by the volume element method were calculated before and after acute ischemia, and were used to approximate regional loads, by a regional stress index (σ/P). Postmortem evaluation using monastral blue staining was used to divide each LV to normal (NZ), ischemic (IZ), and border (BZ) zones in the ischemic case, and to the anatomically matched regions in the preischemic LVs. Ischemia affects the local curvatures and loads both at ED and ES. at ED, σ/P rose significantly only in the IZ. Similarly, at ES, the highest increase in load was detected in the IZ, but increases in circumferential and meridional load were seen in all regions. Identifying the load redistribution following acute ischemia helps delineate the mechanisms affecting geometric LV remodeling following myocardial infarction.

Original languageEnglish (US)
Pages (from-to)147-161
Number of pages15
JournalAnnals of biomedical engineering
Volume21
Issue number2
DOIs
StatePublished - Mar 1 1993

Keywords

  • Curvature
  • Left ventricle
  • Regional function
  • Three-dimensional
  • Ventricular remodeling

ASJC Scopus subject areas

  • Biomedical Engineering

Fingerprint Dive into the research topics of 'Evaluation of regional load in acute ischemia by three-dimensional curvatures analysis of the left ventricle'. Together they form a unique fingerprint.

Cite this