Keywords:
Cardiovascular system, Contrast agents, Veins / Vena cava, CT, Catheter venography, Contrast agent-intravenous, Obstruction / Occlusion
Authors:
C. H. Kristiansen1, T. Tran2, J. C. Lindstrom1, H. Ashraf3, P. Lauritzen2; 1Lørenskog/NO, 2Oslo/NO, 3RASTA/NO
DOI:
10.26044/ecr2019/C-1492
Methods and materials
Prior to CT venography 24 patients were weighed using a professional body composition device based on BIA.
Exclusion criteria were age < 18 years,
pregnancy,
contrast agent allergy,
severely reduced renal function (with a maximum iodine dose < 17,5 g estimated with the Omnivis calculator) or inability to give informed consent.
Measurements were conducted with a dual frequency,
BIA device (Tanita DC-430MA,
Tanita Corporation of America,
Inc.,Arlington Heights,
IL,
USA),
pairing the classic high frequency (50 kHz) with a low frequency (6,25 kHz).
The device is bipolar (foot to foot) with 2 electrodes for each foot,
but without hand-electrodes.
The device is medically approved and has an accuracy of 92% weighted against reference standard dual-energy X-ray absorptiometry (DEXA) for assessment of body composition.
Age,
sex,
height and body type (subjectively assessed as standard or athletic) were entered into the system before patients were positioned barefoot on the device with heels and forefoot aligned with the four electrodes,
as shown in figure 2.
The patients were asked to stand still while the device completed the body composition measurement.
The device automatically estimates total body weight,
fat mass,
percentage of fat,
body mass index (BMI),
muscle mass,
LBM,
LBM percentage of total body weight (%LBM) and bone mass.
LBM and %LBM were also calculated from age,
height,
weight and sex according to the Boer,
James and Hume formulas respectively.
The associations between LBM measured with BIA device and the formulas were estimated by Spearman correlation.