Table 1.

Continuous data analysis of horses undergoing anesthetized left laryngoplasty comparing the administration of an ipsilateral C2–C3 locoregional anesthetic block vs. no locoregional anesthetic block.

Anesthetic parameter	Blocked (n = 20b)	Non-blocked (n = 20)	P-value
Vaporizer setting, pre-surgical (halothane)	2.57 ± 0.11	2.55 ± 0.18	>0.999
Vaporizer setting, pre-surgical (isoflurane)	2.57 ± 0.10	2.52 ± 0.08	>0.999
Vaporizer setting, surgical (halothane)	2.21 ± 0.15	2.12 ± 0.16	>0.999
Vaporizer setting, surgical (isoflurane)	2.08 ± 0.11	2.18 ± 0.12	>0.999
Mean arterial pressure, pre-surgical	57 (48–68)	57 (51–72)	0.95
Mean arterial pressure, surgical	69 ± 6	72 ± 7	0.25
pVara mean arterial pressure, surgical	20 (2.2–167)	29 (2.1–159)	0.25
Heart rate, pre-surgical	34 (30–39)	33 (29–38)	0.12
Heart rate, surgical	32 ± 2	30 ± 4	0.07
pVara heart rate, surgical	1.4 (0.21–9.6)	2.3 (0.07–7.9)	0.49
Presurgical anesthetic time	47 ± 11	45 ± 9	0.51
Surgical anesthetic time	66 ± 10	64 ± 7	0.47
Total anesthetic time	113 ± 17	109 ± 11	0.36
Recovery time	59 ± 23	71 ± 35	0.23

^apVar, population variance.

^bA single horse was removed from vaporizer dial setting analysis due to an intraoperative switch from halothane to isoflurane anesthetic secondary to development of a cardiac dysrhythmia.