Left ventricular hypertrophy due to aortic bypass grafting with a long prosthesis
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Long aortic grafts used for thoracic aortic aneurysm repair can cause progressive left ventricular hypertrophy. The graft
Area of Science:
- Cardiovascular Surgery
- Biomedical Engineering
- Hemodynamics
Background:
- Thoracic aortic aneurysms often require surgical intervention.
- Aortic aneurysm repair can involve bypass grafting to restore blood flow.
Observation:
- Progressive left ventricular hypertrophy was noted after surgeries using long aortic bypass grafts.
- This hypertrophy was not observed with shorter grafts for abdominal aortic aneurysms.
Findings:
- Long grafts from the ascending to abdominal aorta led to left ventricular hypertrophy.
- Hemodynamic factors identified include increased systolic pressure, reduced Windkessel effect, and turbulent flow.
- Low graft distensibility is implicated as a primary cause.
Implications:
- Graft compliance is crucial for long aortic grafts to prevent adverse cardiac remodeling.
- Optimizing graft material properties may mitigate risks associated with aortic reconstruction.
- Further research into graft biomechanics is warranted for thoracic aortic aneurysm treatment.
Abstract:
Progressive left ventricular hypertrophy was observed following operations in which long bypasses were inserted from the ascending aorta to the abdominal aorta for aneurysm exclusion in cases of thoracic aortic aneurysm. This effect was not observed after operations in which there was grafting with a short prosthesis for abdominal aortic aneurysm, wrapping and trans-section of the dissecing aneurysm. Clinical and experimental studies of the hemodynamic aspects suggest that the left ventricular hypertrophy was caused by an increase in systolic blood pressure at the aortic root due to the low distensibility of the long graft, a decrease in the Windkessel effect by exclusion of the proximal aorta and energy loss by turbulence formation of the proximal anastomotic area. Therefore, the distensibility or compliance at the long prosthesis seems to be very important in cases with long grafts of the aorta.