Related Experiment Video
Updated: Aug 19, 2026
Coronary Angiography During Ex-Situ Heart Perfusion in a Porcine Model
Published on: July 12, 2024
Noninvasive detection of coronary allograft vasculopathy by myocardial contrast echocardiography
Ana Clara T Rodrigues1, Fernando Bacal, Caio C Medeiros
1Heart Institute (InCor), Hospital das Clínicas, Echocardiography Laboratory, Faculdade de Medicina da Universidade de São Paulo, Av. Enéas de Carvalho Aguiar 44, Cerqueira César, São Paulo-SP, Brazil.
Insights
Myocardial contrast echocardiography (MCE) accurately detects coronary allograft vasculopathy after heart transplantation. However, this technique struggles to identify the full extent of the disease in asymptomatic patients.
Area of Science:
- Cardiology
- Transplant Medicine
- Diagnostic Imaging
Background:
- Noninvasive detection of coronary allograft vasculopathy (CAV) remains a clinical challenge.
- Heart transplantation recipients require vigilant monitoring for CAV.
- Assessing CAV accurately is crucial for long-term graft survival.
Purpose of the Study:
- To evaluate the diagnostic accuracy of myocardial contrast echocardiography (MCE) for detecting CAV.
- To determine MCE's effectiveness in asymptomatic heart transplant recipients.
Main Methods:
- 35 asymptomatic heart transplant patients underwent MCE with continuous contrast agent infusion.
- Dobutamine stress was employed to assess myocardial perfusion.
- Abnormal MCE was defined as areas with inadequate contrast enhancement during peak stress.
Main Results:
- MCE demonstrated high accuracy (88.6%) in detecting CAV, with 70% sensitivity and 96% specificity.
- Agreement between perfusion defects and coronary artery territories was good for the LAD (kappa=0.56).
- MCE identified the presence but not the extent of disease, with multiple defects missed in multivessel disease cases.
Conclusions:
- Myocardial contrast echocardiography is a valuable tool for detecting the presence of CAV post-transplant.
- MCE's limitation lies in its inability to fully delineate the extent of coronary artery disease.
- Further research may be needed to refine MCE for comprehensive CAV assessment.
Background:
Noninvasive detection of coronary allograft vasculopathy is still challenging. To determine the accuracy of myocardial contrast echocardiography (MCE) in detecting coronary allograft vasculopathy after heart transplantation, we studied 35 asymptomatic patients (30 men, aged 46 +/- 12.7 years) with normal left ventricular function.
Methods:
Patients underwent MCE with continuous contrast (perfluorocarbon-exposed sonicated dextrose albumin) administration. Images were obtained at baseline and during peak dobutamine (up to 40 mg/kg/min) with intermittent harmonic imaging. Areas failing to increase contrast enhancement during peak stress were regarded as abnormal. Coronary artery obstructions greater than 50% at angiography were considered significant.
Results:
Seven out of 10 patients with coronary artery disease had a positive MCE and one patient with a positive MCE had no angiographically detected disease (sensitivity = 70%, specificity = 96%, accuracy = 88.6%). Agreement between the vascular territory and perfusion defects was good for the left anterior descending coronary artery (kappa = 0.56), but not for other arteries. Although 5 patients had multivessel disease, multiple perfusion defects were detected in only one patient.
Conclusion:
MCE showed good accuracy in detecting the presence of coronary allograft vasculopathy after heart transplantation; however, it failed to identify the extent of the disease.
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