Myocardial microstructure assessed by T1 mapping after on-pump and off-pump coronary artery bypass grafting

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Dallazen, Anderson Roberto ; Rezende, Paulo Cury ; Hueb, Whady ; Hlatky, Mark Andrew ; Nomura, Cesar Higa ; Rochitte, Carlos Eduardo ; Boros, Gustavo Andre Boeing ; Ribas, Fernando Faglioni ; Ribeiro, Matheus de Oliveira Laterza ; Scudeler, Thiago Luis ; Dantas, Roberto Nery ; Ramires, Jose Antonio Franchini ; Kalil Filho, Roberto

• Document type: Journal article
• Source: JOURNAL OF THORACIC DISEASE; v. N/A, p. 12-pg., 2023-06-05.

Abstract

Background: The correlation between the release of cardiac biomarkers after revascularization, in the absence of late gadolinium enhancement (LGE) or myocardial edema, and the development of myocardial tissue damage remains unclear. This study sought to identify whether the release of biomarkers is associated with cardiac damage by assessing myocardial microstructure on T1 mapping after on-pump (ONCAB) and off-pump coronary artery bypass grafting (OPCAB). Methods: Seventy-six patients with stable multivessel coronary artery disease (CAD) and preserved systolic ventricular function were included. T1 mapping, high-sensitive cardiac troponin I (cTnI), creatine kinase myocardial band mass (CK-MB), and ventricular dimensions and function were measured before and after procedures. Results: Of the 76 patients, 44 underwent OPCAB, and 32 ONCAB; 52 were men (68.4%), and the mean age was 63 +/- 8.5 years. In both OPCAB and ONCAB the native T1 values were similar before and after surgeries. An increase in extracellular volume (ECV) values after the procedures was observed, due to the decrease in hematocrit levels during the second cardiac resonance. However, the lambda partition coefficient showed no significant difference after the surgeries. The median peak release of cTnI and CK-MB were higher after ONCAB than after OPCAB [3.55 (2.12-4.9) vs. 2.19 (0.69-3.4) ng/mL, P=0.009 and 28.7 (18.2- 55.4) vs. 14.3 (9.3-29.2) ng/mL, P=0.009, respectively]. Left ventricular ejection fraction (LVEF) was similar in both groups before and after surgery. Conclusions: In the absence of documented myocardial infarction, T1 mapping did not identify structural tissue damage after surgical revascularization with or without cardiopulmonary bypass (CPB), despite the excessive release of cardiac biomarkers. (AU)

• FAPESP's process: 11/20876-2 - Increase in biomarkers of myocardial necrosis after surgical or percutaneous revascularization in the absence of demonstrated myocardial infarction
• Grantee: Whady Armindo Hueb
• Support Opportunities: Regular Research Grants