MDCT angiography of acute chest pain: evaluation of ECG-gated and nongated techniques.
OBJECTIVE
The objective of our study was to compare MDCT angiography protocols used in patients with acute chest pain caused by vascular, nonvascular, and cardiac abnormalities.


METHODS
In four groups of 20 patients with chest pain each, four MDCT protocols were used based on monitoring vascular attenuation: pulmonary embolism (150 H at pulmonary artery), aortic dissection (200 H at aortic arch), chest pain (200 H at pulmonary artery), and chest pain with ECG gating (150 H at pulmonary artery). Vascular enhancement was assessed by attenuation measurements taken from locations in the pulmonary artery (n = 3) and thoracic aorta (n = 4). The appearance of the coronary artery in regard to opacification and motion was assessed on a scale of 1 to 5 (best).


RESULTS
The mean pulmonary artery and aorta attenuation (372 H and 352 H, respectively) was significantly higher (p < 0.005, Student's t test) and the number of vessel attenuation points measuring less than 200 H (1/140) was significantly smaller (p < 0.001, chi-square test) in the chest pain compared with the dissection (318 H, 310 H; 16/140), gated chest pain (304 H, 286 H; 17/14), and pulmonary embolism (302 H, 220 H; 28/140) groups. The median coronary artery visualization score was 4; the proximal regions received a significantly (p < 0.005, Mann-Whitney test) higher grade compared with the middle and distal regions (medians, 5, 4, and 2, respectively). Artifacts were noted on the gated scans.


CONCLUSIONS
The chest pain protocol can be used to assess both the pulmonary arteries and the thoracic aorta, whereas the ECG-gating protocol appears to be a promising adjunct for a comprehensive single chest pain protocol.
Raptopoulos
Vassilios D
VD
Department of Radiology, Beth Israel Deaconess Medical Center, 330 Brookline Ave., Boston, MA 02215, USA.
Boiselle
Phillip B
PB
Michailidis
Nikolaos
N
Handwerker
Jason
J
Sabir
Adeel
A
Edlow
Jonathan A
JA
Pedrosa
Ivan
I
Kruskal
Jonathan B
JB
D000208:Acute Disease; D000784:Aortic Dissection / Q000150:complications / Q000175:diagnosis*; D000792:Angiography / Q000379:methods*; D017545:Aortic Aneurysm, Thoracic / Q000150:complications / Q000175:diagnosis*; D002637:Chest Pain / Q000209:etiology*; D004562:Electrocardiography / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011655:Pulmonary Embolism / Q000175:diagnosis*; D014057:Tomography, X-Ray Computed / Q000379:methods