Retrospective comparison of the effects of laryngeal mask and endotracheal tube on some cardio-respiratory variables in pet rabbits undergoing anaesthesia for elective gonadectomy

Table 1 Results of the covariance linear model analysis (F-stat) or Wilcoxon non-parametric (W-stat) analysis of variance

			Airway device		Gender		Weight
	ETT	LMA	F/W-stat	P-value	F-stat	P-value	F-stat	P-value
Loss of RiRef (sec)	391 ± 207	396 ± 145	0.02	0.89	0.00	0.97	0.84	0.37
Propofol (mg/kg)	2.3 (0-5.6)	0 (0-4)	8.82	< 0.01	–	–	–	–
RR (Breaths/min)	148 ± 43	136 ± 56	0.02	0.88	0.74	0.40	2.35	0.15
RR post induction (Breaths/min)	29 ± 7	37 ± 10	0.41	0.53	1.18	0.30	1.09	0.31
PE'CO2 (mmHg)	51 ± 8	41 ± 4	3.75	0.07	3.21	0.09	0.54	0.47
Vt (ml/kg)	6 (5-12)	7 (4-21)	0.16	0.69	–	–	–	–
Tinitial (°C)	39.1 ± 0.5	39.1 ± 0.4	1.72	0.21	4.28	0.06	0.00	0.99
Trecovery (°C)	38.3 ± 1.1	38.2 ± 0.9	1.44	0.25	12.76	< 0.01	1.82	1.82
Extubation time (min)	8 ± 3	6 ± 2	11.18	< 0.01	3.07	0.10	0.27	0.61

Data are reported as mean ± standard deviation or median (min-max). Respiratory rate was measured before and after the insertion of the airway device post anaesthesia induction; PE’CO₂ and Vt were measured by a pitot spirometer connector with a respiratory gas sampling port attached to the airway device and connected to a multiparameter monitor
ETT endotracheal tube, LMA laryngeal mask airway device, PE’CO₂ end-tidal CO₂, RiRef righting reflex, RR respiratory rate, Tinitial temperature measured after the loss of righting reflex, Trecovery temperature measured at recovery, Vt tidal volume

ISSN: 1751-0147