Laryngeal pacemaker: activity of the posterior cricoarytenoid muscle (PCM) and the diaphragm during respiration in sheep.
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.
Zrunek
M
M
2nd ENT Clinic, University of Vienna, Austria.
Mayr
W
W
Streinzer
W
W
Thoma
H
H
Losert
U
U
Schneider
B
B
Unger
E
E
D000818:Animals; D003964:Diaphragm / Q000502:physiology*; D004599:Electric Stimulation Therapy; D004576:Electromyography; D005260:Female; D007821:Laryngeal Muscles / Q000502:physiology*; D009132:Muscles / Q000502:physiology*; D012119:Respiration / Q000502:physiology*; D012756:Sheep