Keywords:
Cardiovascular system, Veins / Vena cava, Interventional vascular, CT-Angiography, Catheter arteriography, Catheter venography, Angioplasty, Computer Applications-General, Thrombolysis, Blood, Trauma, Outcomes
Authors:
T. Tran, C. H. Kristiansen, F. Haidl, S. Roy, J. C. Lindstrom, H. Ashraf, P. Lauritzen; Oslo/NO
DOI:
10.26044/ecr2019/C-2142
Results
Median CO was 7.8 L/min (range: 4.1-11.5) and median HR 72.4 bpm (range: 58.4-102).
Mean TPA was 159 s (95% CI: 141,176).
TPA varied inversely with both CO and HR.
The correlation coefficients between TPA and CO,
and between TPA and HR were -0.52 (p=0.009) and -0.41 (p=0.047) respectively.
The regression coefficients were -10.4 for CO and -2.1 for HR.
This indicates a 74 s variation in optimal scan delay from highest to lowest CO.
(Fig.3) shows the change in mean attenuation in the popliteal vein at 30s intervals after contrast injection with a plateau between 120s and 210s,
and a regression line between CO and TPA.
In 63% of patients TPA exceeded the scan delay of 120 s.
At 120s mean attenuation was appreciably higher than essential for diagnostic purposes in the larger central veins: 140 HU (95% CI,
128,
153) in the inferior vena cava,
129 HU (95% CI,
118,
139) in the external iliac veins,
127 HU (95% CI,
115,
139) in the common femoral veins and 117 HU (95% CI,
105,
129) in popliteal veins.
(Fig.4) shows the attenuation in the inferior vena cava,
external iliac,
common femoral and popliteal veins in a patient at a scan delay of 120s.