There are multiple definitions:

1. atrioventricular sequential pacing(English)

   • DDDR, VDD
   • Electrophysiology

2. diastolic ventricular interaction(English)

   • see ventricular cross talk
   • Cardiology

3. dimensionless [aortic] velocity index(English)

   • through the proximal ascending aorta as measured by calculating the ratio of LV outflow tract velocity-time integral over the aortic velocity time integral
   • AS, GLS
   • Hemodynamics, Ratio-based metric
   • http://dx.doi.o…cho.2016.09.006

4. direct ventricular interaction(English)

   • COPD, DH, HDT, LVEDV, LVESV, LVSV, nITP, RV
   • Cardiology
   • https://doi.org…siol.01109.2016