Xu H, Calvet M, Wei S-Q, Luo Z-C, Fraser WD. Abnormal fetal heart rate tracing patterns in patients with thick meconium staining of the amniotic fluid: association with perinatal outcomes. Am J Obstet Gynecol 2009;200:283.e1-283.e7.
The full discussion appears at www.AJOG.org, pages e1-e4.