Keywords:
Cardiac, Cardiovascular system, CT-Angiography, CT, Diagnostic procedure, Outcomes
Authors:
B. Horehledova, C. Mihl, B. Hendriks, N. G. Eijsvoogel, B. Kietselaer, J. E. Wildberger, M. Das; Maastricht/NL
Methods and Materials
Population:
Between February 2013 and September 2015 there were 82 patients (39 female,
43 male) referred for pre-TAVI evaluation of aortic root,
these were retrospectively evaluated in this study.
Aortic annulus measurements:
Aortic annulus dimensions (short diameter,
long diameter,
annulus area) were measured at the level of the annulus.
Transthoracic Echocardiography:
Doppler transthoracic echocardiography (Philips IE33 Ultrasound,
Philips Medical Systems,
Best,
the Netherlands) was performed by an experienced cardiologist at the cardiology department.
To calculate the AVA in echocardiography left ventricular outflow tract (LVOT) diameter was placed in standard continuity equation [4].
(see figure 1.)
CT angiography:
Retrospectively ECG-gated spiral MDCT of the aortic root was performed on a 2nd generation Dual source CT scanner (Somatom Definition Flash,
Siemens Healthcare,
Forchheim,
Germany).
Annulus dimensions were manually measured using dedicated post-processing software (Syngo.viaTM Siemens Healthcare,
Forchheim,
Germany) in the 10 – 30% phase of the R-R interval at the level of the aortic annulus. Adapted continuity equation was used to combine annulus dimensions measured in CTA with velocity time integrals assessed in echocardiography to establish AVA [5].
(see figure 1.)
Aortic stenosis severity:
To grade severity of AS,
the European Society of Cardiology (ESC) severity scale was used [3].