期刊
BEHAVIORAL NEUROSCIENCE
卷 120, 期 6, 页码 1308-1314出版社
AMER PSYCHOLOGICAL ASSOC
DOI: 10.1037/0735-7044.120.6.1308
关键词
fetus; birth; respiration; norepinephrine; epinephrine
资金
- NICHD NIH HHS [R01 HD050201-11A1, R01 HD050201-13, R01 HD050201, R01 HD050201-12, HD50201] Funding Source: Medline
- NIMH NIH HHS [MH28355, MH46485] Funding Source: Medline
Plasma catecholamines in newborn rats (0-2 hr old) were analyzed following vaginal birth, cesarean section with simulated labor contractions, or cesarean section without labor contractions. Upon delivery, pups were exposed to key elements of the rat's natural birth process, that is, umbilical cord occlusion, tactile stimulation, and cooling. Only pups exposed to actual or simulated labor showed an immediate rise in norepinephrine and epinephrine. Initial postpartum respiratory frequencies were higher in vaginal than in cesarean delivered pups and, in all groups, inversely correlated with catecholamine titers, suggesting respiratory distress or transient tachypnea at lower catecholamine levels. These findings establish a rat model for analyzing effects of labor on neonatal adaptive response during the transition from prenatal to postnatal life.
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