The overall goal of this study is to determine if non-invasive imaging with state of the art
CT coronary angiography can be used to screen for transplant coronary artery disease in the
setting of heart transplant.
Our current protocol at UCSF for heart transplant patients involves screening with stress
tests as well as coronary angiograms with intravascular ultrasound to assess the diameter of
the lumen of the coronary arteries and to assess wall thickness.
Our hypothesis is that state of the art CT coronary angiography can be used to acquire data
regarding the coronary arteries in the setting of heart transplant and be used to risk
stratify patients with regards to the developments of transplant coronary artery disease.
Specific Aim 1- To test the hypothesis that coronary CTA can accurately measure
cross-sectional vessel wall area using conventional coronary angiography with intra-vascular
ultrasound as the standard of reference.
Specific Aim 2- To test the hypothesis that coronary CTA can accurately measure
cross-sectional vessel wall thickness, vessel area and luminal area using conventional
coronary angiography with intra-vascular ultrasound as the standard of reference.
Secondary Aim - To asses the correlation of cross-sectional vessel wall area, vessel wall
thickness, vessel area, luminal area and vessel wall index with global and regional left
ventricular function using coronary CTA.
1. Patient referred for coronary angiography and IVUS as part of their standard clinical
2. Patients must be 18 years of age or older.
3. Any ethnic background is acceptable.
1. Patients with contraindications for the use of iodinated contrast (allergic reaction,
renal failure, multiple myeloma, etc) will be excluded.
2. Patients with heart rate higher than 65 bpm and contraindications for the use of
beta-blockers, listed below:
Systolic blood pressure < 90mmHg Decompensated congestive heart failure; COPD or
asthma in use of bronchodilator; Second or third degree heart block; Severe aortic
stenosis, defined by a pressure gradient higher than 50 mmHg and/or the presence of
3. Patients with contraindications for the use of nitroglycerin, listed below:
Severe anemia; Increased intracranial pressure; Known hypersensitivity; Use of
Sildenafil Citrate (Viagra®)
4. Children and pregnant women will be excluded because of risks associated with
5. Patients must have no atrial fibrillation, as this will interfere with cardiac gating
for the examination.
6. Patients unable to give informed consent will be excluded as well.
7. Patients with a coronary stent placed.