Compare the inflammatory response and myocardial injury from patients (pts) submitted to OffPCABG with those that undergo OnPCABG.
Patients with normal left ventricular function were assigned to OffPCABG (n = 40) and OnPCABG (n = 41). Blood samples were collected before and 24 hours after surgery for determination of creatine kinase (CK)–MB (CK-MB), troponin I (cTnI), interleukin (IL)–6, IL-8, P-selectin, intercellular adhesion molecule (ICAM)-1 and C-reactive protein (CRP). Mortalities were registered at 12 months.
Preoperative CK-MB and cTnI levels were 3.1 ± 0.6 IU and 1.2 ± 0.5 ng/mL for OffPCABG and 3.0 ± 0.5 IU and 1.0 ± 0.2 ng/mL for OnPCABG pts. Postoperative CK-MB and cTnI levels were 13.9 ± 6.5 IU and 19.0 ± 9.0 ng/mL for OffPCABG vs 29.5 ± 11.0 IU and 31.5 ± 10.1 ng/mL for OnPCABG (P < .01). OffPCABG and OnPCABG pts had similar preoperative IL-6 (10 ± 7 and 9 ± 13 pg/mL), IL-8 (19 ± 7 and 17 ± 7 pg/mL), soluble P-selectin (70 ± 21 and 76 ± 23 pg/mL), soluble ICAM–1 (117 ± 50 and 127 ± 52 ng/mL), and CRP (0.09 ± 0.05 and 0.11 ± 0.07 mg/L). At 24 hours, for OffPCABG and OnPCABG: IL-6 was 37 ± 38* and 42 ± 41*,† g/mL; IL-8, 33 ± 31* and 60 ± 15*,† pg/mL; soluble P-selectin, 99 ± 26 and 172 ± 30*,† pg/mL; soluble ICAM-1, 227 ± 47 and 236 ± 87*,† ng/mL; and CRP, 10 ± 11* and 14 ± 13*,† mg/L (*P < .01 vs preoperation; †P < .01 vs OffPCABG). Increased 24-hour postoperative CRP levels was the only marker to have significant positive correlations with events and occurred just for the OnPCABG pts. In-hospital and 1-year mortalities for the OnPCABG and OffPCABG pts were 2.0 % and 2.2 % (P = .1) and 2.7 % and 4.7 % (P = .06), respectively.
Thus, the absence of CPB during CABG preserves better the myocardium and attenuates inflammation—however, without improving survival.