1) Ring blocks
i) Mix 1.0 mg/kg (0.5 mg/lb) bupivacaine with 1.0 mg/kg (0.5 mg/lb)
(1) Either 0.075 mg/kg (0.035 mg/lb) morphine or 0.003 mg/kg (0.0015
mg/lb) buprenorphine may effectively double the duration of analgesia1,2
(2) Sterile water q.s., if needed, to total 1 cc volume for cats less
than 2.5 kg (5 lb).
(3) Sterile water q.s., if needed, to total 2 cc volume for cats 2.5 kg
(5 lb) and over.
ii) Inject subcutaneously at the three sites demonstrated below. Pinch
the skin to tent it away from the deeper tissues and inject
iii) You may drop the lidocaine if given prior to spay (gives
bupivacaine time to take effect)
iv) Bupivacaine has significant potential to cause cardiac toxicity
(1) Calculate dose carefully
(2) Aspirate carefully before injecting
v) DO NOT USE EPINEPHRINE
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June 1, 2011