Transmission fatigue of the rabbit diaphragm

Thomas K. Aldrich

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

This study evaluates the role of transmission fatigue of the diaphragm in rabbits subjected to inspiratory resistive loading (IRL) sufficiently severe to increase peak tidal airway pressure to about 50% of that elicited by 100 Hz phrenic nerve stimulation. After 58 ± 14 in of IRL, the transdiaphragmatic pressure (Pdi) responses to phrenic nerve stimulation at 20, 60, and 100 Hz were reduced by approximately one third. In contrast, IRL induced no significant change in the response to direct diaphragm stimulation (in the presence of transient neuromuscular blockade). Although respiratory acidosis occurred during IRL (pH 7.04 ± 0.04, PCO2 90 ± 10, PO2 131 ± 38), it was not sufficient to explain the reduced contractility. In a separate series of experiments, the diaphragm compound action potential elicited by unilateral phrenic nerve stimuli was recorded by implanted diaphragm electrodes and the Pdi elicited by contralateral phrenic nerve stimulation at 100 Hz was measured. Both action potential amplitude and Pdi declined during IRL and both improved after 10 min of recovery. These findings demonstrate that transmission fatigue plays a major role in rabbit diaphragm fatigue induced by spontaneous breathing against inspiratory resistance.

Original languageEnglish (US)
Pages (from-to)307-319
Number of pages13
JournalRespiration Physiology
Volume69
Issue number3
DOIs
StatePublished - 1987

Fingerprint

Diaphragm
Phrenic Nerve
Fatigue
Rabbits
Action Potentials
Respiratory Acidosis
Pressure
Implanted Electrodes
Neuromuscular Blockade
Respiration

Keywords

  • Loaded breathing
  • Phrenic nerve
  • Respiratory acidosis
  • Respiratory muscles

ASJC Scopus subject areas

  • Physiology
  • Pulmonary and Respiratory Medicine

Cite this

Transmission fatigue of the rabbit diaphragm. / Aldrich, Thomas K.

In: Respiration Physiology, Vol. 69, No. 3, 1987, p. 307-319.

Research output: Contribution to journalArticle

Aldrich, Thomas K. / Transmission fatigue of the rabbit diaphragm. In: Respiration Physiology. 1987 ; Vol. 69, No. 3. pp. 307-319.
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