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Left ventricular papillary muscle morphology and function in left ventricular hypertrophy and left ventricular
E C Madu1, D S Baugh, I A D'Cruz
1Department of Medicine, Division of Cardiovascular Medicine, Vanderbilt University Medical Center, Nashville, Tennessee 37232-6300, USA. ernest.madu@mcmail.vanderbilt.edu
Summary
Transesophageal echocardiography (TEE) reveals papillary muscle (PM) anatomy and function in humans. This study quantifies PM morphology and contractile performance across various left ventricular (LV) conditions.
Area of Science:
- Cardiovascular Imaging
- Echocardiography
- Cardiac Anatomy
Background:
- Papillary muscles (PM) are crucial for left ventricular (LV) function.
- Understanding PM anatomy and contractile performance is vital in various LV conditions.
- Previous studies lacked detailed quantitative data on human PMs in vivo.
Purpose of the Study:
- To evaluate the anatomy and contractile performance of LV papillary muscles (PM) in humans using transesophageal echocardiography (TEE).
- To determine the relationship between PM anatomy and contractile function in normal LV, left ventricular hypertrophy (LVH), and systolic dysfunction.
Main Methods:
- Prospective TEE examinations in 153 patients.
- Measurement of PM dimensions (area, length) and calculation of fractional shortening (FS).
- Assessment of LV ejection fraction (EF), wall thickness, and mass via transthoracic echocardiography.
Main Results:
- In normal EF, % FS was 21.1% (APM) and 17.1% (PPM).
- Hypertrophied LV showed increased PM thickness and cross-sectional area.
- Dilated cardiomyopathy featured longer and thinner PMs compared to normal EF.
Conclusions:
- TEE is a safe and effective method for studying PM morphology and function in humans.
- Quantitative TEE data on PM geometry, size, and contractile function are presented for the first time.
- Findings provide novel insights into PM adaptations in different LV states.