A pilot study of the impact of high-frequency chest wall oscillation in chronic obstructive pulmonary disease patients with mucus hypersecretion

Figures & data

Figure 1 Scatter plot demonstrating the relationship between sputum volume (mL) and lung function (forced expiratory volume in 1 second percentage predicted [FEV₁PRED]).

Figure 2 Boxplots representing median and interquartile range change in lung function (predicted forced expiratory volume in 1 second [FEV₁] percent predicted and forced vital capacity [FVC] percent predicted) from baseline after intervention in high-frequency chest wall oscillation (phase 1) and conventional arm (phase 2).

Table 1 Symptom and St George’s Respiratory Questionnaire (SGRQ)²¹ dimension scores before and after intervention in each arm of the study

	HFCWO before	HFCWO after	P	Conventional before	Conventional after	P
Symptom score	9.09 (3.3)	7.0 (4.7)	0.02	9.33 (2.3)	9.55 (2.0)	NS
SGRQ symptom score	72 (18)	64 (16)	0.02	70 (18)	68 (17)	NS
SGRQ activity score	77 (17)	78 (16)	NS	80 (14)	75 (19)	NS
SGRQ impact score	51 (23)	50 (19)	NS	49 (19)	53 (19)	NS
SGRQ total score	63 (19)	60 (17)	NS	62 (15)	62 (17)	NS

Note: Values in brackets indicate the standard deviation.

Abbreviations: FCWO, high-frequency chest wall oscillation; NS, not significant.

Figure 3 Boxplots demonstrating the St George’s Respiratory Questionnaire domain and total scores before and after intervention in both arms of the study (high-frequency chest wall oscillation B to v1 and conventional phase v2 to v3).

JonesPWQuirkFHBaveystockCMThe St George’s Respiratory QuestionnaireRespir Med199185Suppl B2531 discussion 33–371759018

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