Journal of Cardiovascular Imaging

Korean Society of Echocardiography (한국심초음파학회)
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Diastolic Dyssynchrony in Acute ST Segment Elevation Myocardial Infarction and Relationship with Functional Recovery of Left Ventricle

  • Turan, Burak (Cardiology Department, Kocaeli Derince Training and Research Hospital) ;
  • Dasli, Tolga (Cardiology Department, Kocaeli Derince Training and Research Hospital) ;
  • Erkol, Ayhan (Cardiology Department, Kocaeli Derince Training and Research Hospital) ;
  • Erden, Ismail (Cardiology Department, Kocaeli Derince Training and Research Hospital) ;
  • Basaran, Yelda (Cardiology Department, School of Medicine, Marmara University)
  • Received : 2016.04.02
  • Accepted : 2016.07.26
  • Published : 2016.09.27
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Abstract

Background: Incidence of diastolic dyssynchrony (DD) and its impact on functional recovery of left ventricle (LV) after ST segment elevation myocardial infarction (STEMI) is not known. Methods: Consecutive patients with STEMI who underwent successful revascularization were prospectively enrolled. Echocardiography with tissue Doppler imaging was performed within 48 hours of admission and at 6 months. LV end-diastolic volume index (EDVI), end-systolic volume index (ESVI), ejection fraction (EF), and left atrial volume index (LAVI) were calculated. Diastolic delay was calculated from onset of QRS complex to peak of E wave in tissue Doppler image and presented as maximal temporal difference between peak early diastolic velocity of 6 basal segments of LV (TeDiff). Study patients were compared with demographically matched control group. Results: Forty eight consecutive patients ($55{\pm}10years$, 88% male) and 24 controls ($56{\pm}6years$, 88% male) were included. TeDiff was higher in STEMI than in controls ($35.9{\pm}19.9ms$ vs. $26.3{\pm}6.8ms$, p = 0.025). Presence of DD was higher in STEMI than controls (58% vs. 33%, p = 0.046) according to calculated cut-off value (${\geq}29ms$). There was no correlation between TeDiff and change in EDVI, ESVI, and LAVI at 6 months, however TeDiff and change in EF at 6 months was positively correlated (r = 0.328, p = 0.023). Patients with baseline DD experienced remodeling less frequently compared to patients without baseline DD (11% vs. 38%, p = 0.040) during follow-up. Conclusion: STEMI disrupts diastolic synchronicity of LV. However, DD during acute phase of STEMI is associated with better recovery of LV thereafter. This suggests that DD is associated with peri-infarct stunned myocardium that is salvaged with primary intervention as well as infarct size.

Keywords

References

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