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Preliminary report on the interaction of apolipoprotein E polymorphism with aortic atherosclerosis and acute
G Burkhard MacKensen1, Madhav Swaminathan, Lian K Ti
1Division of Cardiothoracic Anesthesia and Critical Care Medicine, Department of Anesthesiology, Duke University Medical Center, Durham, NC 27710, USA.
Insights
Patients without the apolipoprotein E (APOE) epsilon4 allele face higher risks of kidney dysfunction after cardiac surgery when they have more ascending aorta atheroma. This highlights the APOE epsilon4 allele's protective role in this context.
Area of Science:
- Cardiovascular Surgery
- Nephrology
- Genetics
Background:
- Renal dysfunction is a significant complication following cardiac surgery, linked to adverse outcomes.
- The apolipoprotein E (APOE) epsilon4 allele's role in the relationship between renal dysfunction and ascending aortic arteriosclerosis is not well understood.
- This study investigates how APOE epsilon4 status influences the association between atheroma burden and postoperative renal dysfunction.
Purpose of the Study:
- To determine if the apolipoprotein E (APOE) epsilon4 allele modifies the association between ascending aorta atheroma burden and postoperative renal dysfunction.
- To investigate the interaction between APOE epsilon4 status and atheroma burden in predicting renal dysfunction after coronary bypass surgery.
Main Methods:
- Evaluated atheromatous burden in the ascending, arch, and descending aorta and APOE status in 130 coronary bypass patients.
- Utilized multivariable analyses to assess the relationship between atheroma burden, APOE epsilon4 status, and peak postoperative serum creatinine.
- Considered all p-values less than 0.05 as statistically significant.
Main Results:
- An interaction was found between APOE epsilon4 status and atheroma burden (p = 0.002).
- Increases in ascending aorta atheroma load predicted significantly higher peak postoperative serum creatinine in non-epsilon4 patients compared to epsilon4 patients.
- Confirmed the association between ascending aorta atheroma and peak creatinine (p = 0.0008), independent of APOE status and preoperative creatinine.
Conclusions:
- Ascending aortic atheroma burden increases susceptibility to postoperative renal injury in patients lacking the APOE epsilon4 allele.
- Potential mechanisms include APOE-related differences in inflammation, atheroma detachment during surgery, or renal vulnerability to embolic injury.
Background:
Renal dysfunction is a serious complication of cardiac surgery that is highly associated with short- and long-term adverse outcome. While the apolipoprotein E (APOE) epsilon4 allele has been linked to the occurrence of both postcardiac surgery acute renal injury (epsilon4 favorable) and ascending aortic arteriosclerosis (epsilon4 unfavorable), the role of epsilon4 in the relationship between these two conditions is unknown. We hypothesized that patients with and without the epsilon4 allele (E4/non-E4) would have different associations between atheroma burden and postoperative renal dysfunction.
Methods:
Ascending, arch, and descending aorta atheromatous burden and APOE status were evaluated for 130 coronary bypass patients. Multivariable analyses were performed for aortic regions to assess the relationship of atheroma burden and APOE epsilon4 status with peak in-hospital postoperative serum creatinine. All p < 0.05 were considered significant.
Results:
We found an interaction between E4 status (E4/non-E4; 24/106) and atheroma burden, with a much greater predicted peak in-hospital postoperative serum creatinine for increases in ascending aorta atheroma load for non-E4 patients versus E4 patients (beta coefficient -0.13; p = 0.002). We also confirmed the association between ascending aorta atheroma and peak creatinine (beta coefficient 0.11; p = 0.0008), after controlling for E4 status, preoperative creatinine, and the E4-atheroma interaction.
Conclusions:
Equivalent ascending aortic atheroma burden is associated with a greater susceptibility to postoperative renal injury among patients undergoing cardiac operation who lack the APOE epsilon4 allele. Findings may be attributable to APOE-related differences in inflammation, susceptibility to atheroma detachment (eg, during operative aortic manipulation), or renal vulnerability to embolic injury.
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