Concave Pattern of a Maximal Expiratory Flow-Volume Curve: A Sign of Airflow Limitation in Adult Bronchial Asthma

Table 1

Spirometric parameters in patients with wheeze and bronchial reversibility.

	Baseline		After SABA inhalation		P
	Absolute	% predict	Absolute	% predict
FCV (L)	3.18±1.05	84.4±18.0	3.51±1.05	93.0±15.6	0.0003
FEV1/FCV (%)	70.7±10.2		78.4±10.4		<0.0001
FEV1 (L)	2.24±0.74	72.9±18.1	2.76±0.92	89.1±18.1	<0.0001
PEF (L/s)	4.90±1.88	59.6±16.5	5.64±2.06	68.2±17.1	0.0022
FEF25-75% (L/s)	1.85±0.92	48.1±23.7	2.66±1.38	67.4±29.7	<0.0001
FEF25% (L/s)	3.82±1.52	63.0±22.1	5.15±1.99	84.2±27.0	0.0034
FEF50% (L/s)	2.04±1.02	47.3±23.6	3.20±1.63	72.4±31.0	<0.0001
FEF75% (L/s)	0.81±0.49	43.4±28.0	1.22±0.74	63.6±36.3	<0.0001
Angle β	172±21		188±20		<0.0001
SF25%	0.62±0.34		0.19±0.07		<0.0001
SF50%	0.61±0.19		0.25±0.13		<0.0001

Each value is shown as the mean ± SD.