Source: Annual Congress 2002 - Monitoring respiratory parameters in critically ill patients
Disease area: Airway diseases, Respiratory critical care

Abstract

A new technique has been developed to measure respiratory muscle activity by means of non invasive elektromyography. It showed reproducible and high quality EMG signals of both diaphragm and intercostal muscles in adults and children(1). In this pilot study we investigated the EMG activity in patients with Chronic Obstructive Pulmonary Disease (COPD) and compared it with healthy persons of comparable age. The electrical muscle activity of the diaphragm, intercostal muscles and mm.scaleni was derived transcutaneously during normal breathing at rest(T0) and during breathing through an inspiratory threshold device of 7(T1), 14 (T2), and 21 (T3) cm H20 for 2 minutes, respectively. We used the log EMG-Activity Ratio(EMGAR; peak to peak ratio of respiratory activity) from T1 to T3 and compared it to rest value (T0) as the EMG parameter. Five healthy persons (mean age 52, FEV1 3.5 L) and 4 patients with COPD( mean age 60, FEV1 1.1 L) were included.

	T1(healthy)	T2(healthy)	T3(healthy)	T1(COPD)	T2(COPD)	T3(COPD)
mm.scaleni	0.16	0.31	0.41	0.24	0.56	0.87
mm.intercostales	0,35	0,49	0,74	0,23	0,39	0,53
diaphragm dorsal	0,36	0,43	0,60	0,11	0,22	0,31
diaphragm frontal	0,34	0,42	0,61	0,15	0,31	0,44

COPD patients showed in comparison with healthy persons a higher activity of mm.scaleni to breath against an increasing inspiratory load. Healthy persons showed more activity of mm.intercostales and the diaphragm in this situation.
(1)Respiratory muscle activity measured with a noninvasive EMG technique. Maarsingh et al. J Appl Physiol 2000;88:1955.

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M. Duiverman, L. A. van Eykern, P. H. Vennik, G. H. Koeter, E. J. W. Maarsingh, P. J. Wijkstra (Groningen, Amsterdam, The Netherlands). Different breathing strategies during inspiratory loads in healthy persons and in COPD patients assessed by a noninvasive EMG technique. Eur Respir J 2002; 20: Suppl. 38, 623

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