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Original Research

Phrenic Nerve Conduction Abnormalities Correlate with Diaphragmatic Descent in Chronic Obstructive Pulmonary Disease

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Figures & data

Table 1.  Flow volume loop parameters and PaO2 level in the studied COPD patients

Table 2.  Radiographic measures of lung hyperinflation in COPD patients and controls

Table 3.  Phrenic nerve conduction studies in COPD patients and controls

Table 4.  Side-to-side latency difference (ms) of the recorded phrenic nerve potentials in COPD patients and controls

Figure 1. Diaphragmatic compound muscle action potentials recorded in a patient with COPD (a) showing prolongation of the distal latency of the potentials recorded over the xyphoid process on the right side and the 7th intercostal space on both sides with normal amplitude. Diaphragmatic potentials recorded in a healthy subject are also shown (b).

Figure 1. Diaphragmatic compound muscle action potentials recorded in a patient with COPD (a) showing prolongation of the distal latency of the potentials recorded over the xyphoid process on the right side and the 7th intercostal space on both sides with normal amplitude. Diaphragmatic potentials recorded in a healthy subject are also shown (b).

Table 5.  Correlation analyses between electrophysiological parameters, dyspnea score, flow volume loop parameters, PaO2, and radiographic measures of lung hyper-inflation

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