The diagnosis of phrenic nerve block on chest X-ray by a double-exposure technique

R. Hickey, S. Ramamurthy

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Diaphragmatic paralysis due to phrenic nerve block is a frequent complication of brachial plexus blocks performed above the clavicle. Farrar et al. reported incidences of 36, 36, and 38%, respectively, when routine chest x-rays were taken 4 h following interscalene, subclavian perivascular, and Kulenkampff supraclavicular techniques of brachial plexus blocks. Knoblanche demonstrated a higher incidence of 67% when fluoroscopic exmainations were performed to evaluate diaphragmatic movement in 15 patients within 3 h following subclavian perivascular brachial plexus blocks. Reports of the diagnosis of phrenic nerve block have previously relied upon clinical symptomatology, plain chest x-ray, or fluoroscopy. Recently, we have used a double-exposure technique that has allowed us to easily detect the presence or absence of phrenic nerve block on a single chest x-ray.

Original languageEnglish (US)
Pages (from-to)704-707
Number of pages4
Issue number4
StatePublished - Jan 1 1989

ASJC Scopus subject areas

  • Anesthesiology and Pain Medicine


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