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Figure 1 | Journal of Brachial Plexus and Peripheral Nerve Injury

Figure 1

From: Capnography as an aid in localizing the phrenic nerve in brachial plexus surgery. Technical note

Figure 1

Fused capnograms as seen on the patient monitor. The top row is normal. After electrical stimulation, the middle row reveals progressive notching of the wave form (subclinical diaphragmatic contraction) which degenerates into frank spikes with increasing current corresponding to palpable diaphragmatic contractions. The progressive drop in end tidal CO2 from a baseline of 39 mm Hg to 31 mm Hg is noteworthy.

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