Key result
Patients with a small caliber right coronary artery had significantly lower mean systolic velocity at peak dobutamine dose compared to those with dominant RCA (P=0.001) or dominant circumflex (P<0.001).
Why the study?
Does a small caliber right coronary artery cause right ventricular ischemia in patients undergoing coronary angiography?
Observational (n=60)
Does a small caliber right coronary artery cause right ventricular ischemia in patients undergoing coronary angiography?
A small caliber right coronary artery is associated with right ventricular ischemia during dobutamine stress echocardiography.
Small-caliber RCA may signal RV vulnerability on stress echo; hypothesis-generating and should not yet change practice.
OBJECTIVE: To evaluate ischemia in right ventricle (RV) in patients with small caliber of right coronary artery (RCA). PATIENTS AND METHODS: The study population consisted of 60 consecutive patients undergoing coronary angiography within 3 months. The patients were divided into three different groups according to lumen diameter of RCA and coronary dominance. Group 1, 2, and 3 consisted of patients with small diameter of RCA, dominant RCA, and dominant circumflex artery, respectively. RV ischemia was assessed by using pulse-wave tissue Doppler sampling obtained from RV free wall close to the lateral tricuspid annulus at the apical four-chamber view during dobutamine stress echocardiography (DSE). RESULTS: When the mean systolic velocity percentages of increase from low to peak dose dobutamine in patients with small RCA were compared to those of other groups, statistically significant difference was found between group 1 and the other groups (P = 0.007 for group 1 vs group 2; P = 0.01 for group 1 vs group 3). The mean systolic velocity at peak dobutamine dose of patients with small caliber of right coronary artery was statistically lower than the other groups (P = 0.001 for group 1 vs group 2, P < 0.001 group 1 vs group 3). CONCLUSIONS: There are a group of patients with small diameter of RCA causing probable ischemia in RV and small caliber of RCA can really matter in these patients.
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Celık et al. (2005) conducted an observational in Small caliber of right coronary artery (n=60). Small caliber of right coronary artery vs. Dominant right coronary artery and dominant circumflex artery was evaluated on Mean systolic velocity at peak dobutamine dose (p=P = 0.001 for group 1 vs group 2, P < 0.001 group 1 vs group 3). Patients with a small caliber right coronary artery had significantly lower mean systolic velocity at peak dobutamine dose compared to those with dominant RCA (P=0.001) or dominant circumflex (P<0.001).
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