Muscle & nerve · 2013
Phrenic nerve conduction studies in patients with chronic obstructive pulmonary disease.
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Podnar Simon, Harlander Matevž
Аннотация
INTRODUCTION: The most common etiology of hypercapnic respiratory failure is chronic obstructive pulmonary disease (COPD). However, the differential diagnosis also includes neuromuscular disorders. We studied the specificity of reduced amplitude phrenic nerve compound motor action potential (CMAP) to diagnose neuromuscular disorders.
METHODS: A group of patients with advanced COPD were recruited prospectively and compared with controls. Phrenic nerve CMAPs were measured bilaterally using supraclavicular surface stimulation and bipolar recording (G1: 5 cm above the xiphoid; G2: 16 cm from G1).
RESULTS: A group of 20 patients (15 men) and a group of 29 controls (15 men) were included. Phrenic nerve CMAPs of patients with COPD had significantly longer latency and higher amplitude.
CONCLUSION: Our study demonstrates that patients with hypercapnic respiratory failure and reduced phrenic nerve CMAP amplitude most probably have a neuromuscular disorder affecting the diaphragm and not COPD or another lung disorder.
METHODS: A group of patients with advanced COPD were recruited prospectively and compared with controls. Phrenic nerve CMAPs were measured bilaterally using supraclavicular surface stimulation and bipolar recording (G1: 5 cm above the xiphoid; G2: 16 cm from G1).
RESULTS: A group of 20 patients (15 men) and a group of 29 controls (15 men) were included. Phrenic nerve CMAPs of patients with COPD had significantly longer latency and higher amplitude.
CONCLUSION: Our study demonstrates that patients with hypercapnic respiratory failure and reduced phrenic nerve CMAP amplitude most probably have a neuromuscular disorder affecting the diaphragm and not COPD or another lung disorder.
Предметные рубрики MeSH
Action PotentialsAdultAgedCase-Control StudiesDiagnosis, DifferentialDiagnostic Techniques, NeurologicalFemaleHumansHypercapniaMaleMiddle AgedNeural ConductionNeuromuscular DiseasesPhrenic NerveProspective StudiesPulmonary Disease, Chronic ObstructiveRespiratory InsufficiencySensitivity and Specificity