PMC7661778_01
Right pinnae mass. (A) Rostral view; (B) caudal view.
fvets-07-560379-g0001.jpg
PMC7661778_01_fvets-07-560379-g0001.jpg
F1
The mass on the right external pinna was raised, firm, diffusely red to black, partially ulcerated with moderate crusted serous discharge (Figures 1A,B).
Representative picture of a normal horse demonstrating locations for injection of local anesthetics. The asterisk (*) along the caudal aspect of the pinnae denotes the location of the auriculopalpebral nerve. The curvilinear line along the lateral aspect of the pinnae denotes the approximate location of a hemi-circumferential ring-block.
fvets-07-560379-g0002.jpg
PMC7661778_01_fvets-07-560379-g0002.jpg
F2
An additional 10 ml of 2% mepivacaine was injected subcutaneously in a hemi-circumferential fashion along the lateral base of the ear to ensure total regional anesthesia occurred (Figure 2).
(A) Placement of the constricting latex tourniquet on the base of the right pinna immediately after application (rostral view); (B) wound at 47 days post-tourniquet application (26 days following sloughing of ear), with healing granulation bed and evidence of the middle ear canal sealing over (rostral to right of image); (C) healed auriculectomy with mild scar formation (rostral to right of image).
fvets-07-560379-g0003.jpg
PMC7661778_01_fvets-07-560379-g0003.jpg
F3
The constricting latex tourniquet was applied using the Callicrate bander device as close to the base of the ear as possible, ensuring the tourniquet was situated at least 1 cm beyond the margins of the mass (Figure 3A). The horse was re-examined 47 days post-tourniquet application (26 days following sloughing of the external pinna) and the granulation bed was noted to have sealed over the middle ear canal (Figure 3B). The owner reported that the amputation site had completely healed with minor scar formation present (Figure 3C).
Physical exam parameters (heart rate [beats/min] and respiratory rate [breath/min]) for the initial 24 h following application of the tourniquet.
fvets-07-560379-g0004.jpg
PMC7661778_01_fvets-07-560379-g0004.jpg
F4
For all examinations within the first 24 h, heart rate and respiratory rate were normal (ranges: 28-48 beats per minute and 12-20 breathes per minute, respectively, Figure 4).