Laryngeal Pacemaker: Activity of the Posterior Cricoarytenoid Muscle (PCM) and the Diaphragm during Respiration in Sheep

M. Zrunek 2nd ENT Clinic, University of Vienna, Austria

W. Mayr Bioengineering Laboratory of the 2nd Surgical Clinic, University of Vienna, Austria

W. Streinzer 2nd ENT Clinic, University of Vienna, Austria

H. Thoma Bioengineering Laboratory of the 2nd Surgical Clinic, University of Vienna, Austria

U. Losert Department of Experimental Surgery of the 2nd Surgical Clinic, University of Vienna, Austria

B. Schneider Department of Medical Statistics and Documentation, University of Vienna, Austria

E. Unger Bioengineering Laboratory of the 2nd Surgical Clinic, University of Vienna, Austria

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Abstract

Electromyograms (EMG) of the PCM and the diaphragm were evaluated in 6 sedated female sheep. Corresponding pneumatograms were recorded simultaneously by means of thermocontrolled respiration flowmeter. Evidence was obtained on considerable intra- and inter-individual differences in the duration of respiratory cycles as well as PCM- and diaphragmatic activity. Most of the evaluated respiratory periods showed either a phase coincidence between the PCM and the diaphragm, or a leading edge of about 40-80 ms of the posticus muscle. Due to this minimal phase shift, the diaphragmatic myogram seems to be a valuable trigger for an external PCM stimulation unit in bilateral recurrent nerve palsy.

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Laryngeal Pacemaker: Activity of the Posterior Cricoarytenoid Muscle (PCM) and the Diaphragm during Respiration in Sheep

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Laryngeal Pacemaker: Activity of the Posterior Cricoarytenoid Muscle (PCM) and the Diaphragm during Respiration in Sheep

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