Related Experiment Video

Updated: Jul 11, 2026

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats
06:32

Evaluation of Coronary Flow Reserve After Myocardial Ischemia Reperfusion in Rats

Published on: June 28, 2019

Echocardiographic and hemodynamic determinants of right coronary artery flow reserve and phasic flow pattern in

Pedro Graziosi1, Barbara Ianni, Expedito Ribeiro

  • 1Heart Institute (InCor) - University of Sao Paulo Medical School, Clinical Division, Sao Paulo, Brazil. graziosi@attglobal.net

Cardiovascular Ultrasound
|September 28, 2007
PubMed

Insights

Right coronary artery (RCA) flow patterns and flow reserve (CFR) in non-ischemic cardiomyopathy (NIC) are not affected by right-sided cardiac disturbances. RCA CFR remains similar to the left anterior descending coronary artery (LAD) in advanced NIC patients.

Area of Science:

  • Cardiology
  • Cardiovascular Physiology

Background:

  • Right-sided cardiac disturbances in advanced non-ischemic cardiomyopathy (NIC) have prognostic implications.
  • Right coronary artery (RCA) flow patterns and coronary flow reserve (CFR) in NIC are not well understood.
  • Investigating RCA hemodynamics in NIC can provide crucial insights into disease mechanisms and patient outcomes.

Purpose of the Study:

  • To assess RCA phasic flow pattern and CFR in advanced NIC patients.
  • To compare RCA flow characteristics with the left anterior descending coronary artery (LAD).
  • To investigate correlations between cardiac structural, mechanical, hemodynamic parameters and RCA flow patterns or CFR.

Main Methods:

  • Non-invasive evaluation (echocardiography) and cardiac catheterization in 24 severe NIC patients.
  • Intracoronary Doppler (Flowire) assessment of RCA and LAD flow before and after adenosine.
  • Comparison of RCA flow patterns and CFR between subgroups with and without pulmonary hypertension or right ventricular (RV) dysfunction, and with LAD.

Main Results:

  • Resting RCA phasic flow pattern showed no significant difference in subgroups with or without pulmonary hypertension or RV dysfunction.
  • RCA phasic flow pattern was significantly lower than LAD (1.35 vs. 2.85, p < 0.001).
  • No significant correlation was found between cardiac mechanical/hemodynamic parameters and RCA-CFR or RCA flow pattern. RCA-CFR was similar to LAD (3.38 vs. 3.34, p = NS).

Conclusions:

  • In advanced NIC, RCA exhibits a mild diastolic predominance in flow pattern, less pronounced than LAD.
  • Pulmonary artery hypertension and RV dysfunction do not significantly affect RCA flow pattern or CFR.
  • RCA flow reserve is comparable to LAD, irrespective of right-sided cardiac disturbances in advanced NIC.
Abstract

More Related Videos

Dynamic Assessments of Coronary Flow Reserve after Myocardial Ischemia Reperfusion in Mice05:07

Dynamic Assessments of Coronary Flow Reserve after Myocardial Ischemia Reperfusion in Mice

Published on: August 25, 2023

Related Concept Videos

Acute Coronary Syndrome III: Diagnostic Studies01:30

Acute Coronary Syndrome III: Diagnostic Studies

Diagnosing acute coronary syndrome or ACS begins with a thorough patient history. Notable symptoms include central, crushing chest pain radiating to the left arm, neck, jaw, or back, along with shortness of breath, sweating (diaphoresis), nausea, vomiting, dizziness, and palpitations.It is crucial to note any history of cardiac illnesses and assess risk factors, including age, gender, smoking, hypertension, diabetes, hyperlipidemia, and a sedentary lifestyle.During physical examination, vital...
Cardiomyopathy III: Hypertrophic Cardiomyopathy01:29

Cardiomyopathy III: Hypertrophic Cardiomyopathy

Hypertrophic cardiomyopathy, or HCM, is an autosomal dominant genetic disorder characterized by asymmetric left ventricular hypertrophy without ventricular dilation. It is more common in men and is typically diagnosed in young, athletic adults.EtiologyHCM is primarily genetic and is caused by mutations in genes encoding sarcomeric proteins. Researchers have identified over 1400 mutations across at least 11 different genes. Among these, the most frequently occurring mutations are found in the...
Rheumatic Heart Disease II: Clinical Manifestations and Diagnostic Studies01:22

Rheumatic Heart Disease II: Clinical Manifestations and Diagnostic Studies

The key clinical manifestations of Rheumatic heart disease (RHD) include several distinct cardiac symptoms.Carditis, a hallmark of acute rheumatic fever, involves inflammation of the heart's endocardium, myocardium, and pericardium. Chronic RHD often results from recurrent episodes of carditis. Its symptoms include the following:Murmurs are caused by valvular damage, especially to the mitral and aortic valves. Mitral stenosis or regurgitation is common, with characteristic heart murmurs...
Cardiomyopathy IV: Restrictive Cardiomyopathy01:29

Cardiomyopathy IV: Restrictive Cardiomyopathy

Restrictive cardiomyopathy (RCM) is a rare heart muscle disease characterized by impaired ventricular filling due to stiffened ventricular walls, leading to significant diastolic dysfunction.EtiologyRestrictive cardiomyopathy can arise from both inherited and acquired diseases, many of which are systemic. It is categorized into four main types: infiltrative, storage, non-infiltrative, and endomyocardial diseases.Infiltrative diseases, such as amyloidosis, lead to RCM by depositing amyloid...