Randomized Controlled Trial

Phenylephrine infusion versus bolus regimens during cesarean delivery under spinal anesthesia: a double-blind randomized clinical trial to assess hemodynamic changes.

Anesth. Analg.. 2012 Dec 1;115(6):1343-50.
Review

Techniques for preventing hypotension during spinal anaesthesia for caesarean section.

Cochrane Db Syst Rev. 2006 Oct 18 (4): CD002251CD002251.

No intervention has yet been shown to completely avoid maternal hypotension due to spinal anaesthesia for Caesarean section.
pearl
Randomized Controlled Trial

Maternal cardiovascular consequences of positioning after spinal anaesthesia for Caesarean section: left 15 degree table tilt vs. left lateral.

Anaesthesia. 2002 Jan 1;57(1):15-20.