Longitudinal shortening remains the principal component of left ventricular pumping in patients with chronic myocardial infarction even when the absolute atrioventricular plane displacement is decreased.

The epicardial short-axis areas used for calculation of AVPD contribution to SV were increased in infarct patients ( p < 0.01) but in the subanalysis, LAD-MI had larger epicardial areas compared to controls ( p < 0.01) while RCA-MI did not reach significance ( p = 0.06). Figure 2 shows the mean extent of the MI for all LAD-MI and RCA-MI patients, respectively. Longitudinal contribution to LVSV was numerically lower in patients compared to controls but this difference did not reach statistical significance ( p = 0.08 for LAD and p = 0.09 for RCA) (Table 2 , Fig. 3 ).

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