Summary
The marked inspiratory reaction elicited by collapse of the lungs during a pneumothorax is essentially different from the weak inspiratory effect brought about by decrease of lung volume during expiration under normal conditions. The latter effect is mainly a release from the inpiratory inhibition exerted by pulmonary stretch receptors firing at high rates; a release which is reinforced on the one hand by post-inhibitory, i.e., inspiratory rebound activity, on the other by moderate activation of inspiration due to low firing rate of the stretch receptors. The marked inspiratory reaction is, however, elicited by pulmonary deflation receptors that discharge through slowly conducting afferent fibres. It should be regarded as a nociceptive reflex preventing pulmonary collapse, or local effects such as atelectasis and pulmonary compression. The present investigations show that the marked inspiratory reaction plays an important role during experimentally produced asthma bronchiale.
1. In guinea-pigs sensitized to egg albumen, reversible bronchial asthma is produced by inhalation of antigen aerosol. At the onset of raised bronchial resistance, an inspiratory reaction characterized by tachypnoea and increase in lung volume occurs. It is mediated by afferent vagus fibres subserving inspiration and is modified at later stages by chemical factors.
2. This vagal inspiratory reflex is due to morphological pulmonary changes, i.e., emphysema and atelectasis. These disturbances of the mechanics of breathing produce increase of intrathoracic pressure during expiration and hence compression of the lungs; this in turn leads to excitation of vagal deflation receptors which sets up the inspiratory reaction and modifies the Hering-Breuer inflation reflex.
3. The inspiratory reaction plays an important role in the cycle of morphological pulmonary changes and physiological reactions that underlie an asthma attack, and represents a defence mechanism of the lungs constrained within the thoracic cage.
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Literatur
Breuer, J.: Die Selbststeuerung der Atmung durch den Nervus vagus. Sitz. Ber. Akad. Wiss. Wien (II)58, 909–937 (1868).
Fernandez de Molina, A., u.O. A. M. Wyss: Selektive Reizung des afferenten Lungenvagus. Helv. physiol. pharmacol. Acta8, 464–474 (1950).
Hering, E.: Die Selbststeuerung der Atmung durch den Nervus vagus. Sitz. Ber. Akad. Wiss. Wien (II)57, 672–677 (1868).
Hess, W. R.: Die Regulierung der Atmung, gleichzeitig ein Beitrag zur Physiologie des vegetativen Nervensystems. Leipzig: Georg Thieme 1931.
Koller, E. A.: Atmung und Kreislauf im anaphylaktischen Asthma bronchiale des Meerschweinchens. I. Atmungs- und Kreislaufreaktionen des „Normaltieres“. Helv. physiol. pharmacol. Acta25, 287–308 (1967).
—— Atmung und Kreislauf im anaphylaktischen Asthma bronchiale des Meerschweinchens. II. Die Bedeutung des N. vagus für die Atmungs- und Kreislaufreaktion. Helv. physiol. pharmacol. Acta25, 353–373 (1967).
—— Atmung und Kreislauf im anaphylaktischen Asthma bronchiale des Meerschweinchens. III. Die Lungenveränderungen im Asthmaanfall und die inspiratorische Reaktion. Helv. physiol. pharmacol. Acta26, 153–170 (1968).
Paintal, A. S. Impulses in vagal afferent fibres from specific pulmonary deflation receptors. The response of these receptors to phenyl diguanide, potato starch, 5-hydroxytryptamine and nicotine, and their role in respiratory and cardiovascular reflexes. Quart. J. exp. Physiol.40, 89–111 (1955).
—— The influence of certain chemical substances on the initiation of sensory discharges in pulmonary and gastric stretch receptors and atrial receptors. J. Physiol. (Lond.)135, 486–510 (1957a).
—— The location and excitation of pulmonary deflation receptors by chemical substances. Quart. J. exp. Physiol.42, 56–71 (1957b).
Reynolds, L. B.: Characteristics of an inspiration-augmenting reflex in anesthetized cats. J. appl. Physiol.17, 683–688 (1962).
Rossier, P. H., A. Bühlmann u.K. Wiesinger: Physiologie und Pathophysiologie der Atmung, S. 225. Berlin: Springer 1958.
Wyss, F., u.F. Schmid: Beruht die bronchialasthmatische Dyspnoe auf einer Bronchialstenose? Schweiz. med. Wschr.81, 916–920 (1951).
Wyss, O. A. M.: Reizphysiologische Analyse des afferenten Lungenvagus. Pflügers Arch. ges. Physiol.242, 215–233 (1939).
—— Respiratory centre and reflex control of breathing. I. The mode of functioning of the respiratory centre. II. The part played by the lungs in the reflex control of breathing. Helv. physiol. pharmacol. Acta12, Suppl. X, 5–25, 26–35 (1954).
—— Die nervöse Steuerung der Atmung. Erg. Physiol.54, I–IV, 1–479 (1964)
——, etA. Rivkine: Les fibres afférentes du nerf vague participant aux réflexes respiratoires. Helv. physiol. pharmacol. Acta8, 87–106 (1950).
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Wyss, O.A.M., Koller, E.A. Die inspiratorische Reaktion als Abwehrmechanismus des Atmungsapparates. Beitr. Klin. Tuberk. 138, 243–249 (1968). https://doi.org/10.1007/BF02090684
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DOI: https://doi.org/10.1007/BF02090684