Source: Annual Congress 2002 - Physiotherapy: assessment and outcome in healthy subjects and patients with chronic lung disease
Disease area: Airway diseases

Abstract

Incentive spirometry was introduced by Bartlett in 1973 to prevent and treat atelectasis after abdominal or thoracic surgeries. Nowadays, there are controversies about its efficacy (Overend, T.J. et al. Chest 2001; 120: 971-978). The aim of this study was to assess VI and thoracoabdominal motion, using volume and flow-oriented IS. Seven healthy subjects were studied. We measured, breath-by-breath, VI, minute ventilation (VE), respiratory frequency (f), inspiratory duty cycle (TI/TT), mean inspiratory flow (V), rib cage (%RC) and abdomen (%AB=100-%RC) contribution to VI, with respiratory inductance plethysmography (Respitrace, NIMS, USA). Two volume-oriented IS (Voldyne and Coach, DHD, USA), with a pre-fixed volume of 1500 ml, and two flow-oriented IS (Triflo II, Sherwood, USA and Respirex, DHD, USA) limited at 900 cc/s, were assessed. In all, 299 breaths were analysed. The table shows data: mean (SE), for the group as a whole.
Our results show that there was a significant diference in VI when volume-oriented IS were used*(p<0.05). When comparing the four IS a significant diference was found in TI/TT, f, V, VE, %RC and %AB, between volume and flow-oriented IS (p<0.005).

	COACH	VOLDYNE	TRIFLO II	RESPIREX
VI (ml)	863 (54)*	990 (93)*	970 (104)	856 (93)
%RC	50.4 (5.3)	50.6 (4.0)	59.7 (6.1)	56.9 (6.7)
%AB	49.6 (5.3)	49.4 (4.0)	40.2 (6.1)	43.0 (6.7)
VE (l/min)	6.5 (0.46)	8.1 (0.9)	11.2(1)	10.7 (0.7)
f (bpm)	7.5 (0.25)	8.0 (0.21)	11.9 (1.1)	12.9 (0.6)
Ti/Tt (%)	0.57 (0.02)	0.52 (0.03)	0.37 (0.02)	0.34 (0.02)
V(ml/sec)	189 (13)	273 (46)	504 (42)	531 (30)

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V. F. Parreira, G. M. Tomich, R. R. Britto, R. F. Sampaio (Belo Horizonte, Brazil). Assessment of inspired volume (VI) and thoracoabdominal motion, using volume and flow-oriented incentive spirometers (IS), in healthy subjects. Eur Respir J 2002; 20: Suppl. 38, 1157

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