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Systemic arterial compliance early and late after a first acute myocardial infarction
S Aakhus1, K Bjørnstad, J Soma
1Department of Medicine, University of Trondheim, Norway.
Insights
Systemic arterial compliance significantly decreased 2.3 years after myocardial infarction, despite stable peripheral resistance. Left ventricular volumes also increased, indicating long-term cardiovascular changes post-heart attack.
Area of Science:
- Cardiology
- Vascular Physiology
- Echocardiography
Background:
- Acute myocardial infarction (MI) can lead to long-term changes in cardiovascular function.
- Assessing systemic arterial properties and left ventricular function is crucial for understanding post-MI recovery and prognosis.
- Previous studies have focused on early changes, but long-term arterial alterations require further investigation.
Purpose of the Study:
- To evaluate changes in systemic arterial properties and left ventricular function in patients early and late after a first acute myocardial infarction.
- To compare arterial properties between MI patients and healthy controls over time.
- To determine if arterial distensibility or peripheral resistance changes significantly in the long term post-MI.
Main Methods:
- Doppler echocardiography and calibrated subclavian artery pulse tracing were used to assess cardiac and vascular function.
- Systemic arterial properties, including total arterial compliance (using a 3-element windkessel model), peripheral resistance, and characteristic impedance, were measured.
- Measurements were taken early (5 weeks) and late (27 months) after the first acute MI in 19 patients and in age-, gender-, and blood pressure-matched healthy controls.
Main Results:
- Total arterial compliance decreased by 26% from early to late assessment in MI patients (p < 0.001).
- Left-ventricular end-diastolic and end-systolic volumes increased by 11% and 18%, respectively (p < 0.05) in MI patients.
- Peripheral resistance and characteristic impedance did not change significantly in MI patients. Healthy controls showed similar arterial compliance early post-MI but higher compliance at the late assessment.
Conclusions:
- Arterial distensibility is significantly decreased 2.3 years after a first acute myocardial infarction.
- Long-term changes post-MI include reduced arterial compliance and moderate left ventricular dilatation.
- Peripheral resistance remains unchanged, suggesting that decreased arterial compliance is a key long-term vascular adaptation after myocardial infarction.
Abstract:
Systemic arterial properties and left ventricular function were assessed by Doppler echocardiography and a calibrated subclavian artery pulse tracing early (5 weeks) and late (27 months) after a first acute myocardial infarction in 19 patients aged 44-77 years and in healthy subjects matched for age, gender, and arterial blood pressure. Total arterial compliance (3-element windkessel model) was reduced by 26% (p < 0.001) from early to late assessment, and left-ventricular end-diastolic and end-systolic volumes were increased by 11 and 18%, respectively (p < 0.05). Peripheral resistance and characteristic impedance were not significantly changed. The healthy matched subjects had arterial compliance similar to patients at early assessment, but tended to be higher at late. Thus, 2.3 years after a first acute myocardial infarction with moderate left ventricular dilatation, arterial distensibility was significantly decreased whereas peripheral resistance was not changed.