Effects on Fetal Breathing Movements of Maternal Challenges: Cross-Over Study on Dynamic Work, Static Work, Passive Movements, Hyperventilation and Hyperoxygenation
| Autor: | Karel Marsal, Olof Löfgren, Gerhard Gennser |
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| Rok vydání: | 1979 |
| Předmět: |
Adult
Mean arterial pressure Movement Partial Pressure Pregnancy Trimester Third Physical Exertion Blood Pressure pCO2 Passive movements Fetal Heart Fetus Heart Rate Pregnancy Fetal breathing movements Hyperventilation Heart rate medicine Humans business.industry Respiration Work (physics) Infant Newborn Obstetrics and Gynecology General Medicine Carbon Dioxide Hydrogen-Ion Concentration respiratory system Crossover study Oxygen Anesthesia Female medicine.symptom business Muscle Contraction circulatory and respiratory physiology |
| Zdroj: | Acta Obstetricia et Gynecologica Scandinavica. 58:335-342 |
| ISSN: | 1600-0412 0001-6349 |
| DOI: | 10.3109/00016347909154592 |
| Popis: | Ten women in the last trimester of a normal pregnancy were subjected to five different loads in a cross-over study. Fetal breathing movements (FBM), fetal heart rate (FHR), maternal heart rate (MHR), and mean arterial pressure (MAP), maternal transcutaneously measured pO2 (Tc-pO2), and the energy supply to the Tc-pO2 electrode were recorded continuously before, during, and after the load. Maternal capillary pH and pCO2 were measured at three representative time points. The immediate responses of the incidence of FBM to the different challenges were: increase after dynamic work (bicycle test); no change after static work (isometric muscle contraction) and passive movements; decrease after hyperventilation and hyperoxygenation. FHR was unaffected by all challenges. The FBM incidence varied in parallel with pCO2 after dynamic work and hyperventilation and inversely with the Tc-pO2 rise caused by hyperoxygenation. Maternal pH was increased after passive movements (no change in FBM) and after hyperventilation (decreased incidence of FBM), FBM seem to be more sensitive to environmental changes than is the FHR. Mechanical stimuli to the uterus were not responsible for the augmentation of FMB seen after the bicycle test. The present observations reveal the multifactorial nature of the regulation of FBM, and support the role of CO2 as a major stimulator of breathing movements also in prenatal life. |
| Databáze: | OpenAIRE |
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