Keywords:
Cardiac, Cardiovascular system, CT, Conventional radiography, Surgery, Experimental investigations, Embolism / Thrombosis
Authors:
P. Aigner, T. Schloeglhofer, L. C. Plunger, D. Beitzke, A. Wielandner, H. Schima, D. Wiedemann, D. Zimpfer, F. Moscato; Vienna/AT
DOI:
10.26044/ecr2019/C-2851
Methods and materials
Routinely acquired X-rays and CT-scans of 74 patients implanted with a HVAD pump (Medtronic plc,
Dublin,
Ireland) between 2012 and 2015 were retrospectively analyzed (see Fig.
2).
A study group with existing pump thrombosis (PT,
n=8) and a control group (NT,
n=10) were identified.
The inflow cannula (IC) position of the LVAD was measured using the X-Ray and CT-scans as follows.
In the CT-scans multiplanar reconstructions (see Fig.
3) were used to get the three-chamber view defined by the following anatomical landmarks: the mitral valve,
the aortic valve and the tip of the LVAD (as the apex of the left ventricle is usually covered by the LVAD).
Two angles were then measured: angle α describes the deviation of the IC axis from the axis connecting the cannula tip and the mitral valve,
and angle β characterizes of the out of plane deviation of the IC axis to the three-chamber plane.
From the frontal X-Rays the pump pocket depth and the angle of the IC to the horizontal line were analyzed.
The elliptical approximations for the projected pump bodies were evaluated in the frontal and also in the lateral X-Rays (see Fig.
4).