Table 1 Demographic and procedural data for the SA group and the PB group. Median F_E’_ISO (%) during surgery is higher in PB Group compared with SA Group (p = 0.01). Median time to perform SA (min) considers the 10 min required for fixation of the local anaesthetic

Breed (n)

14 Mix breed

9 Mix breed

Not evaluated

3 Labrador retriever

6 Labrador retriever

2 Jack russel

2 Jack russel terrier

2 Maremma sheepdog

2 Boxer

1 Yorkshire terrier

1 Golden retriever

1 Boxer

1 Cavalier King Charles Spaniel

1 Bloodhound

1 Border collie

1 Australian shepherd

1 Malinois

1 Maltese

1 American Staffordshire

1 Argentinian dogo

1 Volpino

1 Poodle

1 Cocker

1 Bernese mountain dog

1 Leonberger

1 German shepherd

1 Cane corso

Age (years)

7 (0.8–10)

7 (1–12)

0.29

Weight (kg)

23.5 (4–56)

24 (5–56)

0.45

Type of surgery (n)

Tibial plateau levelling osteotomy (TPLO) without arthrotomy: 15

Tibial plateau levelling osteotomy (TPLO) without arthrotomy: 16

0.22

Tibial plateau levelling osteotomy (TPLO) with arthrotomy: 14

Tibial plateau levelling osteotomy (TPLO) with arthrotomy: 13

ASA Class (n)

ASA I: 27/29 (93%)

ASA I: 28/29 (97%)

0.6

ASA II: 2/29 (7%)

ASA II: 1/29 (3%)

0.6

Median propofol induction bolus (mg/ kg)

5 (2.4–10.8)

4 (3.3–7.5)

0.38

Median FE’ISO of isoflurane (%) during surgery

1.2 (0.8–1.4)

1.3 (0.9–1.4)

0.01

Median time to perform locoregional technique (min)

16 (12–32)

10 (4–15)

 < 0.001

Median time between induction and local anaesthetic (LA) injection (min)

33 (22–62)

36 (25–45)

0.91

Median time between LA injection and skin incision (min)

28 (17–34)

25 (12–37)

0.08

Median time between LA injection and end of surgery (min)

92 (73–103)

105 (72–135)

0.06

Median duration of entire anaesthesia (min)

140 (119–172)

147 (120–188)

0.18

Cases with at least one arousal event (%)

0/29 (0)

0/29 (0)

1