[Evaluation of patency of coronary artery bypass grafts and stents using multislice spiral computed tomography in comparison with angiography].
The aim of the study was to assess usefulness of multislice spiral computed tomography--MSCT (Somatom Plus 4 Volume Zoom, Siemens) in non-invasive assessment of the potency of coronary artery bypass grafts both venous and arterial grafts as well as stents.


METHODS
The study was performed using the MSCT method with Heart View Software with retrospective electrocardiographic gating. Nonionic, hypo-osmolar contract media was infused into a peripheral vein to highlight the coronary arteries and bypasses. All patients, due to clinical indications, underwent coronary and bypass angiography.


METHODS
Two group of patients (82 persons) in total were evaluated: after aorto-coronary bypassing (Group I--57 persons, incl. 40 males and 17 females) and after stent implantation (Group II--25 persons, incl. 19 males and 6 females). The patients were referred to invasive diagnostics for recurrence and aggravation of clinical symptoms.


RESULTS
In group I, the patency of 187 bypasses was evaluated (21 arterial and 166 venous). In MSCT, was found in 131 of the bypasses patency (114 venous and 4 arterial). 56 bypasses, (52 venous and 4 arterial) were obstructed. In the bypassography performed were obstructed 53 (5 venous and 3 arterial), 134 bypasses were patent (116 venous and 18 arterial). In the bypass patency assessment using MSCT compared to coronarography, specificity of 94.7% and sensitivity of 92.4% were achieved. In group II, patency was evaluated in 26 stents: 21 implanted to native vessels and 5 in venous bypasses. 19 stents in native vessels were found patent, whereas 2 were obstructed. In the coronary bypasses performed, patency was confirmed in 19 stents and 2 were obstructed. In MST obstruction was demonstrated in 4 stents in coronary bypasses, which was confirmed in bypassography. One stent was assessed patient in both methods.


CONCLUSIONS
The MSCT method is useful for assessment of patency of venous and arterial bypasses as well as stents.
Pasowicz
Mieczysław
M
Krakowski Szpital Specjalistyczny, Instytut Kardiologii Collegium Medicum Uniwersytetu Jagiellońskiego w Krakowie.
Klimeczek
Piotr
P
Przewłocki
Tadeusz
T
Zmudka
Krzysztof
K
Konieczyńska
Małgorzata
M
Krochin
Marek
M
Kozanecki
Artur
A
Wilkołek
Piotr
P
Sadowski
Jerzy
J
Podolec
Piotr
P
Tracz
Wiesława
W
D000328:Adult; D000368:Aged; D017023:Coronary Angiography / Q000379:methods*; D001026:Coronary Artery Bypass; D023921:Coronary Stenosis / Q000000981:diagnostic imaging*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D015607:Stents; D036542:Tomography, Spiral Computed / Q000379:methods*; D014654:Vascular Patency