Key result
Patients with a history of anterior myocardial infarction undergoing coronary artery bypass grafting had significantly worse left ventricular ejection fraction (36.90% vs 51.62%, p=0.002) and higher pericardial fluid cytokine levels compared to patients with no previous MI.
Why the study?
Does the site of prior myocardial infarction affect left ventricular function and cytokine levels in patients undergoing coronary artery bypass grafting?
Observational (n=60)
No
Does the site of prior myocardial infarction affect left ventricular function and cytokine levels in patients undergoing coronary artery bypass grafting?
Absolute Event Rate: 36.9% vs 51.62%
p-value: p=0.002
Patients with a history of anterior MI undergoing CABG exhibit worse left ventricular function and higher local and systemic inflammatory cytokine levels compared to those with posterior/inferior MI or no prior MI.
Prior anterior MI associated with worse LV function and higher pericardial cytokines in CABG; hypothesis-generating, needs prospective confirmation.
BACKGROUND: The purpose of this study was to examine the relationship between left ventricular (LV) function, cytokine levels and site of myocardial infarction (MI) in patients undergoing coronary artery bypass grafting (CABG). METHODS: Sixty patients undergoing CABG were divided into three groups (n = 20) according to their history of site of myocardial infarction (MI): no previous MI, anterior MI and posterior/inferior MI. In the pre-operative period, detailed analysis of LV function was done by transthoracic echocardiography. The levels of adrenomedullin, interleukin-1-beta, interleukin-6, tumour necrosis factor-alpha (TNF-α) and angiotensin-II in both peripheral blood samples and pericardial fluid were also measured. RESULTS: Echocardiographic analyses showed that the anterior MI group had significantly worse LV function than both the group with no previous MI and the posterior/inferior MI group (p < 0.05 for LV end-systolic diameter, fractional shortening, LV end-systolic volume, LV end-systolic volume index and ejection fraction). In the anterior MI group, both plasma and pericardial fluid levels of adrenomedullin and and pericardial fluid levels of interleukin-6 and interleukin- 1-beta were significantly higher than those in the group with no previous MI (p < 0.05), and pericardial fluid levels of adrenomedullin, interleukin-6 and interleukin-1-beta were significantly higher than those in the posterior/inferior MI group (p < 0.05). CONCLUSIONS: The results of this study indicate that (1) patients with an anterior MI had worse LV function than patients with no previous MI and those with a posterior/inferior MI, and (2) cytokine levels in the plasma and pericardial fluid in patients with anterior MI were increased compared to patients with no previous MI.
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Kiriş et al. (2016) conducted an observational in Coronary artery disease requiring coronary artery bypass grafting (n=60). Anterior myocardial infarction vs. No previous myocardial infarction was evaluated on Left ventricular ejection fraction (LVEF) (p=0.002). Patients with a history of anterior myocardial infarction undergoing coronary artery bypass grafting had significantly worse left ventricular ejection fraction (36.90% vs 51.62%, p=0.002) and higher pericardial fluid cytokine levels compared to patients with no previous MI.
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