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[Control and development of breathing, pathophysiological aspects]
1Abteilung für angewandte Physiologie, Ruhr-Universität Bochum.
Insights
The respiratory control system maintains acid-base balance and breathing rhythms from fetal development through birth. Early life breathing patterns and reflexes influence later risks for sleep apnea and sudden infant death.
Area of Science:
- Physiology
- Neuroscience
- Developmental Biology
Context:
- The respiratory control system is crucial for maintaining acid-base homeostasis and regulating breathing patterns.
- Fetal respiratory and sleep-wake mechanisms are interconnected, with progesterone influencing acid-base balance.
- Cardiopulmonary parameters during fetal life and delivery are critical for initiating postnatal respiration.
Purpose:
- To explore the intricate relationship between respiratory control, acid-base balance, and sleep-wake mechanisms from fetal development to early life.
- To elucidate the physiological adaptations during delivery that trigger the initiation of breathing.
- To investigate how perinatal respiratory reflexes and patterns may predispose individuals to later respiratory disorders.
Summary:
- The respiratory control system ensures acid-base homeostasis and rhythmic breathing, influenced by exercise and behavior.
- Fetal development shows synchronized respiratory and sleep-wake patterns, with progesterone-mediated acid-base regulation.
- Delivery-induced PCO2 increase triggers sensory input, leading to lung inflation, with postnatal breathing reliant on chemosensitive and reticular activating systems.
Impact:
- Understanding these early mechanisms can inform strategies for preventing or managing sleep apnea, ALTE, SIDS, and congenital central hypoventilation syndrome.
- Highlights the long-term implications of perinatal respiratory development on lifelong health.
- Provides insights into the neurophysiological basis of breathing regulation from prenatal to postnatal life.
Abstract:
The respiratory control system guarantees acid-base-homeostasis as well as the rhythmic activities of the respiratory motor system in accordance with exercise and behavioural programmes of the human being. Cortical patterns and synchronized respiratory patterns with tracheal flow and pressure variations in the fetus indicate the common network of respiration and sleep-wake mechanisms in an early stage already. During fetal life acid-base-homeostasis is dependent on progesterone controlled mechanisms. CO2 partial pressure of the uterine artery reduces to 32 mmHg. The O2 Partial pressure of the umbilical vein is 25-30 mmHg only. The raise of PCO2 during delivery is accompanied by a shower of sensory input to the reticular formation causing arousal and the opening of the lungs. The continuation of postnatal breathing is the consequence of the integration of the central chemosensitive mechanism and the reticular activating system at an adequate threshold. Perinatal defense reflexes, functional patterns and strategies in early life may outline later pathophysiological mechanisms for sleep apnea, apparently life threatening event (ALTE), sudden infant death, and congenital central hypoventilation syndrome.