Quantitative study on the size of coronary artery supplying areas postmortem

Area of Science:

• Cardiovascular Anatomy
• Human Pathology

Background:

• Understanding myocardial perfusion is crucial for diagnosing and treating cardiac diseases.
• Variations in coronary artery supply can impact cardiac function and surgical outcomes.

Purpose of the Study:

• To determine the relative myocardial territory supplied by the three major coronary arteries in human hearts.
• To investigate the influence of coronary artery anatomy and cardiac hypertrophy on perfusion distribution.

Main Methods:

• Postmortem analysis of 171 human hearts.
• Planimetrical measurements of myocardial sections using roentgenograms.
• Quantification of ventricular myocardium supplied by left descending, left circumflex, and right coronary arteries.

Main Results:

• The left descending coronary artery supplied an average of 41.5% of the ventricular myocardium.
• The left coronary artery branches collectively supplied 63.8%, while the right coronary artery supplied 36.2%.
• Coronary artery type significantly influenced supply area size, more so than cardiac hypertrophy.

Conclusions:

• Coronary artery anatomy is the primary determinant of myocardial perfusion territories.
• A strong correlation exists between the size of a myocardial supplying area and the lumen diameter of its corresponding coronary artery.
• Significant right coronary artery dominance over left coronary artery supply is rare.