Related Experiment Videos
[Left atrial booster pump function in patients with hypertrophic cardiomyopathy and essential hypertension:
1Second Department of Internal Medicine, Kanazawa University School of Medicine.
Insights
In hypertrophic cardiomyopathy (HCM) and hypertension (HT) patients, impaired left atrial function affects left ventricular filling. HCM patients showed reduced atrial ejection fraction, indicating significant diastolic dysfunction.
Area of Science:
- Cardiology
- Cardiovascular Physiology
Background:
- Left ventricular diastolic dysfunction is crucial in hypertrophic cardiomyopathy (HCM) and essential hypertension (HT).
- Left atrial contraction significantly impacts left ventricular filling, especially in early diastole.
Purpose of the Study:
- To evaluate the left atrial booster pump function in patients with HCM and HT.
- To analyze parameters of left atrial preload, afterload, and ejection indices.
Main Methods:
- Study included control subjects (n=5), HT patients (n=6), and HCM patients (n=11).
- Analysis of left atrial preload (LAPd, LAVd), afterload (LVEDP, K), and ejection indices (LAEF, ACVI).
- Echocardiography was used to assess left ventricular wall thickness and filling parameters.
Main Results:
- Left ventricular wall was thicker in HT and HCM groups compared to controls.
- Left ventricular rapid filling volume index was reduced in HT and significantly reduced in HCM.
- Left atrial preload (LAPd, LAVd) and afterload (LVEDP, K) were elevated in HT and further increased in HCM.
- Left atrial ejection fraction (LAEF) was significantly reduced in HCM patients.
Conclusions:
- HCM is associated with significantly impaired left atrial ejection fraction, contributing to diastolic dysfunction.
- Elevated left atrial preload and afterload are characteristic of both HT and HCM, with HCM showing more severe impairment.
Abstract:
In patients with hypertrophic cardiomyopathy (HCM) and essential hypertension (HT), left ventricular dysfunction in early diastole which is associated with left atrial contraction plays an important role in left ventricular filling. To evaluate left atrial booster pump function, we analyzed left atrial preload (left atrial pressure at the end of diastasis; LAPd, left atrial volume index at the end of diastasis; LAVd), left atrial afterload (left ventricular end-diastolic pressure; LVEDP, left ventricular chamber stiffness constant; K), and left atrial ejection indices (left atrial ejection fraction during atrial contraction; LAEF, left atrial ejection volume index during atrial contraction; ACVI). The study subjects consisted of control subjects (n = 5), HT patients (n = 6), and HCM patients (n = 11). The left ventricular wall was significantly thicker in the HT and HCM groups. The left ventricular rapid filling volume index was less in the HT group, and significantly less in the HCM than in the control group. LAPd and LAVd were greater in the HT group than in the control group, and greater in the HCM group than in the HT group. LVEDP and K were greater in the HT group than in the control group, and significantly greater in the HCM group than in the other 2 groups. ACVI was greater in the HT group than in the control group, but in the HCM group, ACVI was significantly less than in the HT group and did not differ significantly from that in the control group. LAEF was significantly less in the HCM group than in the other 2 groups.(ABSTRACT TRUNCATED AT 250 WORDS)