Table 1. Overview of different types of aortic regurgitation in transcatheter valves and their pathophysiological mechanisms.

Regurgitation type	Pathophysiology
Transvalvular	Damage to leaflets
	Overexpansion of prosthesis
Paravalvular	Extensive calcification of aortic valve
	Patient/prosthesis mismatch
	Underexpansion of prosthesis
	Malposition of prosthesis
Supra-skirtal	Low implantation of prosthesis
	Design of prosthesis

Adapted from Tarantini G et al., Am J Cardiovasc Dis 2011;1:314