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Phrenic nerve conduction in infancy and early childhood

✍ Scribed by Tomihiro Imai; Hirohiko Shizukawa; Hitoshi Imaizumi; Yasuo Shichinohe; Morihito Sato; Seiya Kikuchi; Yoshikazu Hachiro; Masayoshi Ito; Motoi Kashiwagi; Susumu Chiba; Hiroyuki Matsumoto

Publisher: John Wiley and Sons
Year: 2000
Tongue: English
Weight: 143 KB
Volume: 23
Category: Article
ISSN: 0148-639X
DOI: 10.1002/(sici)1097-4598(200006)23:6<915::aid-mus11>3.0.co;2-t

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✦ Synopsis

Diaphragmatic action potentials (DAPs) were mapped on the thorax bilaterally in 16 neurologically normal infants and 8 boys aged 1 to 4 years during artificial ventilation after thoracic surgery. Transcutaneous stimulation was used to activate the phrenic nerve at the supraclavicular fossa at the end of an artificial inspiration. The DAPs were of positive polarity and were recorded on the ipsilateral anterolateral chest wall over the sixth to the eighth intercostal spaces, with a maximal peak at the seventh intercostal space. The DAP latencies gradually decreased from 6 to 8 ms at birth to about 5 ms at the age of 1 year, despite an increase of conduction distance. Statistical analyses revealed that DAP amplitude did not correlate with age. The latencies and amplitudes of the DAPs displayed little interside variation. The results are valuable not only as a reference for the diagnosis of patients with phrenic nerve palsy, but also as an indicator of the normal development of the phrenic nerve.

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