OBJECTIVE To describe a treatment for a mandibular fracture in a guinea pig (Cavia porcellus). ANIMAL A 6-month-old sexually intact male guinea pig referred for a 24-hour history of hyporexia. CLINICAL PRESENTATION, PROGRESSION, AND PROCEDURES Physical examination showed lateral displacement of the incisors and inflammation and crepitation during mandible lateralization. Imaging tests revealed a minimally displaced complete oblique fracture of the left mandible with fracture of the left mandibular first premolar tooth and incisor tooth. TREATMENT AND OUTCOME Conservative treatment was established by placing a chin sling (CS) to immobilize the jaw and a nasogastric tube for nutritional support. Imaging tests repeated 3 weeks later showed initial callus formation, and the conservative treatment was discontinued. Follow-up examinations showed appetite and progressive weight gain. Five months later, the clinical crown of the left mandibular incisor was absent and a resorptive lesion on the left mandibular first premolar tooth was detected. Complete ossification of the fracture without premolar and moler teeth elongation was observed on control imaging tests. Ten months after initial examination, the patient was reportedly healthy with no signs of pain or dental disease. CLINICAL RELEVANCE Jaw fracture treatments in guinea pigs are poorly described in the literature. Surgical treatment can be challenging in this species due to its skull and dental anatomy. Although CS was originally employed to increase the congruency of premolar and molar teeth after coronal reduction, this device yielded satisfactory results as a noninvasive, inexpensive treatment of a mandibular fracture in this guinea pig. Alopecia on the back of the head was the only undesired adverse effect associated with the CS.
A healthy 2-year-old entire female domestic dwarf rabbit (Oryctolagus cuniculus) was referred for ovariohysterectomy. The premedication included subcutaneous 3 mg/kg ketamine, 1 mg/kg midazolam and 0.05 mg/kg medetomidine. A CT scan was performed under sedation to assess the lumbosacral region. Anaesthesia was induced with propofol (total dose of 10 mg/kg) and maintained with isoflurane in a mixture of oxygen and medical air administered through a supraglottic airway device. Under anaesthesia and prior to the ovariohysterectomy, an ultrasound-guided epidural was performed administering 0.1 mg/kg preservative free morphine and 0.35 per cent (2.4 mg/kg) bupivacaine as part of the multimodal analgesic approach. Haemodynamic stability with no signs of hypotension, bradycardia or hypoventilation were observed under anaesthesia. Meloxicam (0.5 mg/kg) and buprenorphine (0.03 mg/kg) were administered during the postoperative period. A smooth and uneventful anaesthesia, recovery and hospitalisation period were achieved. Ultrasound-guided epidural administration of drugs could be applied in similar cases.
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