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Atypical phasic coronary artery narrowing
Insights
This study details four rare instances of phasic coronary artery narrowing, where arteries constricted only during systole or diastole. These cases highlight unusual causes like pericardial adhesions and left ventricular aneurysms impacting coronary blood flow.
Area of Science:
- Cardiology
- Cardiovascular Physiology
- Medical Case Reports
Background:
- Phasic coronary artery narrowing is a rare condition.
- Understanding its diverse etiologies is crucial for diagnosis and management.
Observation:
- Reported are four unique cases of phasic coronary artery narrowing.
- Two cases involved diastolic compression of the left anterior descending coronary artery due to pericardial adhesions in patients with aortic insufficiency.
- One case showed systolic compression of right ventricular coronary branches associated with hypertrophic cardiomyopathy.
- Another case presented systolic compression of the posterior descending coronary artery caused by a left ventricular aneurysm.
Findings:
- Pericardial adhesions, hypertrophic cardiomyopathy, and left ventricular aneurysms can cause phasic coronary artery compression.
- The location and timing (systolic or diastolic) of compression vary based on the underlying pathology.
- Diagnostic challenges and pathophysiologic mechanisms were analyzed for each case.
Implications:
- These cases expand the known spectrum of coronary artery compression syndromes.
- Recognition of these unusual presentations is vital for accurate diagnosis and appropriate therapeutic strategies.
- Further investigation into the specific mechanisms of compression may improve patient outcomes.
Abstract:
Four unusual cases of phasic (occurring only in systole or only in diastole) coronary artery narrowing are reported. In two cases, diastolic compression of the left anterior descending coronary artery was due to tight pericardial adhesions in patients with aortic insufficiency; in the third case, systolic compression of two right ventricular coronary branches was associated with hypertrophic cardiomyopathy and a normotensive right ventricle; and in the fourth case, a large aneurysm of the inferior wall of the left ventricle caused systolic compression of the posterior descending coronary artery, which was epicardial. The diagnostic and pathophysiologic characteristics of each case are discussed.