Safety and applicability of a pre-stage public access ventilator for trained laypersons: a proof of principle study

Table 2 Criteria for detection of different manoeuvres

	Mathematical algorithm	Clinical observation
Leakage	Integration (time) of expiratory and inspiratory flow for volume estimation (V_exp and V_insp)	Curve characteristics:
		V_insp > V_exp
		p_eff ≠ p_insp
		Flow_insp > 50 l/min
Airway occlusion	Integration (time) of expiratory and inspiratory pressure	Curve characteristics:
		ETCO₂ ≤ 2%; FO₂ = constant
		p_eff = p_insp
		Flow ≪ 10 l/min

V _exp expiratory volume, V _insp inspiratory volume, ETCO ₂ end tidal fraction of carbon dioxide, FO ₂ oxygen fraction, p _eff effective pressure, p _insp = inspiratory pressure, Flow _insp = inspiratory flow

ISSN: 1471-227X