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Breathing movements before death in the primate fetus (Macaca mulatta)
American Journal of Obstetrics and Gynecology
|September 1, 1979
Summary
Fetal breathing movements (FBMs) in monkeys show periodic patterns and circadian distribution. FBMs decrease with fetal acidemia during labor, preceding apnea and gasping before death.
Area of Science:
- Reproductive Biology
- Fetal Physiology
- Primate Research
Background:
- Fetal breathing movements (FBMs) are crucial indicators of fetal well-being.
- Understanding FBM patterns can provide insights into fetal health and distress.
Purpose of the Study:
- To analyze the incidence and characteristics of FBMs in the period preceding fetal death in utero.
- To observe FBM patterns in normal fetuses and during the process of fetal demise.
Main Methods:
- Continuous tracheal pressure recordings were analyzed in 7 chronic pregnant monkey (Macaca mulatta) preparations.
- Recordings covered a 48-hour period before fetal death, with physiological parameters assessed beforehand.
Main Results:
- Normal fetuses exhibited periodic FBMs with a circadian distribution and four distinct patterns.
- During intrapartum death (5 fetuses), FBM incidence decreased with developing fetal acidemia.
- Pre-labor death (2 fetuses) was preceded by apnea and gasping, with duration dependent on the lethal insult.
Conclusions:
- FBMs display predictable patterns in normal fetuses, including circadian variations.
- A decline in FBMs correlates with fetal acidemia and impending death during labor.
- Apnea and gasping are terminal events in fetal demise, with timing influenced by the cause of death.