Fig. 4From: Prediction of preload dependency using phenylephrine-induced peripheral perfusion index during general anaesthesia: a prospective observational studyRelative and absolute change in the perfusion index after phenylephrine administration. (A) Relative and absolute change in perfusion index in patients in Group (1) (B) Relative and absolute change in perfusion index in patients in Group (2) (C) Relative and absolute change in perfusion index in patients in Group (3) (D) Relative and absolute change in perfusion index in patients in Group (4) PIH, post-induction hypotension. *P < 0.05Back to article page