Table 2. K1, K2, R2, and A Values of Each Group before and after Operation
Values are expressed as medians (10–90%).
* P < 0.05 vs. before insertion ETT or LMA ™. K1, K2, and A are constants obtained by fitting translaryngeal-flow relationship to the differential equation P ={A * (dV̇/dt)}+ (K1*V̇) + (K2*V̇)* (absV̇), where P, dV̇/dt, V̇, and abs (V̇) denote translaryngeal pressure, acceleration calculated by differentiation from gas flow, gas flow, and absolute value of gas flow, respectively. Quality of fit is provided by coefficient R2.
ETT = endotracheal tube; LMA ™=Laryngeal Mask Airway ™; spont = spontaneous breathing; vent = mechanical ventilation under complete paralysis.