The study aims as the principal objective to compare two approaches to diagnosis unilateral diaphragmatic paralysis: transdiaphragmatic pressure (Pdi) measurement versus phrenic nerve conduction (NPC) study. The secondary objective of the study is the strengths and weaknesses of different tests. Diagnostic threshold values.
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Diaphragm evaluation-compound muscle action potential
Timeframe: at 1 month
Diaphragm evaluation-transdiaphragmatic pressure
Timeframe: at 1 month