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Obesity is associated with lower coronary microvascular density
Duncan J Campbell1, Jithendra B Somaratne, David L Prior
1St. Vincent's Institute of Medical Research, Fitzroy, Australia ; Department of Medicine, The University of Melbourne, St. Vincent's Health, Fitzroy, Australia.
Plos One
|December 7, 2013
Summary
Obesity is linked to reduced coronary microvascular density and increased left ventricular filling pressure. This may explain heart issues like diastolic dysfunction and higher heart failure risk in obese individuals.
Area of Science:
- Cardiology
- Obesity Medicine
- Cardiovascular Pathology
Background:
- Obesity is a known risk factor for diastolic dysfunction, reduced myocardial blood flow, impaired metabolism, and heart failure.
- The relationship between obesity, left ventricular filling pressure, and myocardial structure requires further investigation.
Purpose of the Study:
- To investigate the association between obesity, left ventricular filling pressure, and myocardial structure.
- To determine how obesity impacts coronary microvascular density and cardiac function.
Main Methods:
- Histological analysis of non-ischemic myocardium from 57 patients undergoing coronary artery bypass graft surgery.
- Comparison of myocardial structure and microvasculature between obese (BMI >30 kg/m²) and non-obese (BMI ≤30 kg/m²) individuals.
Main Results:
- Obese patients exhibited lower capillary length density and higher diffusion radius compared to non-obese patients.
- Increased Body Mass Index (BMI) correlated with elevated pulmonary capillary wedge pressure (PCWP).
- Lower capillary length density was associated with both increased BMI and elevated PCWP.
Conclusions:
- Obesity and elevated left ventricular filling pressure are linked to reduced coronary microvascular density.
- This reduction in microvascular density may contribute to diastolic dysfunction, impaired myocardial metabolism, and an increased risk of heart failure in obese individuals.
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