Comment on

• Burden of proof.

  Smiley RM. Smiley RM. Anesthesiology. 2009 Sep;111(3):470-2. doi: 10.1097/ALN.0b013e3181b16466. Anesthesiology. 2009. PMID: 19672174 Free PMC article. No abstract available.
• Placental transfer and fetal metabolic effects of phenylephrine and ephedrine during spinal anesthesia for cesarean delivery.

  Ngan Kee WD, Khaw KS, Tan PE, Ng FF, Karmakar MK. Ngan Kee WD, et al. Anesthesiology. 2009 Sep;111(3):506-12. doi: 10.1097/ALN.0b013e3181b160a3. Anesthesiology. 2009. PMID: 19672175 Clinical Trial.
• Hemodynamic effects of ephedrine, phenylephrine, and the coadministration of phenylephrine with oxytocin during spinal anesthesia for elective cesarean delivery.

  Dyer RA, Reed AR, van Dyk D, Arcache MJ, Hodges O, Lombard CJ, Greenwood J, James MF. Dyer RA, et al. Anesthesiology. 2009 Oct;111(4):753-65. doi: 10.1097/ALN.0b013e3181b437e0. Anesthesiology. 2009. PMID: 19741494 Clinical Trial.