Table 2.

Mean ± standard deviation values of cardiorespiratory parameters, in dogs treated with ketamine (GK: bolus 0.5 mg kg⁻¹; CRI 20 µg kg⁻¹ min⁻¹ in intra- and postoperative periods), fentanyl (GF: bolus 5 µg kg⁻¹; intraoperative CRI 5 µg kg⁻¹ h⁻¹ and postoperative CRI 2 µg kg⁻¹ h⁻¹), or combination of ketamine-fentanyl (GKF: aforementioned doses) in postoperative period

		Postoperative period (hours)
Variable	Group	Baseline	0.25	0.5	1	2	4	6	8	12
HR (beats minute−1)	GK	104 ± 13	107 ± 14a	96 ± 20	87 ± 10a#	95 ± 14a	86 ± 13	86 ± 13	98 ± 39	101 ± 14
	GKF	110 ± 22	104 ± 13a	97 ± 9	89 ± 7a	87 ± 14a.b#	90 ± 13	90 ± 7	95 ± 14	94 ± 16
	GF	97 ± 35	82 ± 24b	71 ± 13	70 ± 20b#	75 ± 21#	65 ± 17#	79 ± 14	83 ± 18	83 ± 17
fR (breaths minute−1)	GK	30 ± 10	40 ± 23	36 ± 15	43 ± 12#	47 ± 11#	37 ± 18	32 ± 10	30 ± 10	43 ± 47
	GKF	34 ± 14	44 ± 41	39 ± 23	45 ± 23	52 ± 39	35 ± 13	36 ± 11	29 ± 10	35 ± 15
	GF	28 ± 4	54 ± 21	44 ± 25	68 ± 37	43 ± 27	29 ± 17	33 ± 20	38 ± 19	27 ± 7
SAP mmHg	GK	136 ± 25	137 ± 9a.b	139 ± 12	136 ± 15	136 ± 24	148 ± 17	144 ± 17	140 ± 22	143 ± 16
	GKF	153 ± 13	153 ± 15a	155 ± 18	151 ± 17	170 ± 28	160 ± 15	160 ± 21	151 ± 12	143 ± 21
	GF	136 ± 13	132 ± 23b	163 ± 12	148 ± 8	138 ± 35	136 ± 15	141 ± 10	158 ± 7#	147 ± 3

^{a, b, c} Significant difference between group. ^# Significant difference in treatment with a basal time point. HR Heart rate, fR respiratory rate, SAP systolic arterial pressure