Using intra-breath oscillometry in obesity hypoventilation syndrome to detect tidal expiratory flow limitation: a potential marker to optimize CPAP therapy

Table 2 Demographic data of study patients

		Mean (SD, or %)
Male N		23 (65.71%)
Age years		56.31 (± 8.63)
BMI kg/m²		49.34 (± 10.88)
Baseline AHI /h^†		23.93 (± 28.08)
AHI ≥ 5/h N		24 (77.4%)
AHI ≥ 30/h N		7 (22.6%)
*OHS stage (according to Shah NM et al.)* [23]
	I	3 (8.6%)
	II	1 (2.9%)
	III	19 (54.3%)
	IV	12 (34.3%)
*Arterial blood gas*^#
	pH	7.42 (± 0.04)
	pCO₂ mmHg	42.89 (± 8.96)
	pO₂ mmHg	71.41 (± 11.85)
	HCO₃ mmol/L	26.53 (± 2.46)
*Forced spirometry test*
	FVC Liter	2.72 (± 0.83)
	FVC %	74.31 (± 15.91)
	FEV₁ Liter	1.97 (± 0.67)
	FEV₁%	65.91 (± 18.07)
	FEV₁/FVC %	70.93 (± 9.39)

Demographic data of study patients (N = 35) are presented as mean(± SD) or n(%);
† AHI was measured at the time when NIV treatment was initiated
^# Note the normalized values of arterial blood gas as a result of the NIV treatment
BMI = body mass index; OHS = obesity hypoventilation syndrome; pCO₂ = partial pressure of arterial carbon dioxide; pO₂ = partial pressure of arterial oxygen; HCO₃ = bicarbonate; FVC = forced vital capacity, FEV₁ = forced expiratory volume in 1 s;

ISSN: 1471-2466