Normal chest radiographs can be challenging to evaluate and easy to over interpret in the rabbit. The thoracic cavity is small relative to the abdomen, and the heart takes up a large portion of the thorax. The cranial border of the heart is less distinct due to the presence of the thymus, which persists throughout the life of the rabbit. The cranial lung lobes are small and are obscured by a wide mediastinum. The caudal lung lobes have a pronounced vasculature. Additionally rapid breathing makes it difficult to obtain an inspiratory film unless the rabbit is anesthetized and intubated.
The turtle ear is a simple structure that sits caudoventral to the eye covered by a large scale called the tympanic scute. As in many reptiles, the external ear is absent in chelonians. The tympanic membrane sits flush against the skin just underneath the tympanic scute. There is one ossicle, the columella, which crosses the large tympanic cavity to insert medially on the oval window of the cochlea. A narrow Eustachian tube connects the middle ear to the oropharynx.
Aural abscesses are well-encapsulated, caseous plugs that slowly develop until it fills the tympanic cavity. The cause of aural abscessation is not completely understood…
Intravenous catheters are commonly placed in ferrets and rabbits to administer fluids and medications, induce anesthesia, and for delivery of analgesic drugs during and after surgery. Intravenous catheters are also placed with growing frequency in chinchillas, guinea pigs and other small exotic companion mammals. Use this video clip or text with still images to review patient selection, potential complications, equipment needed and step-by-step instructions for this technique, as well as daily fluid requirements, catheter maintenance, and patient monitoring.
Intravenous catheters are commonly placed in rabbits to administer fluids, medications, induce anesthesia, and for delivery of analgesic drugs during the perioperative and postoperative periods. Catheterization techniques used in dogs and cats can also be used for rabbits. To reduce the time in handling and reduce stress, supplies needed for catheterization should be set out and ready to go, prior to removing the patient from the cage.
The rabbit has a relatively short prothrombin time and whole blood quickly clots at room temperature. To minimize the risk of clot formation, it can be helpful to pre-heparinize the needle and syringe by drawing heparin into the needle and expelling the excess from the hub. The total volume of blood that can be safely collected typically ranges from 0.5% to 1.0% body weight. Collect smaller volumes from geriatric patients or those suspected to have anemia or hypoproteinemia.
Use this video clip or article with still images to review equipment needed, and potential venipuncture sites including the jugular vein, lateral saphenous vein, and ear vessels.
The pathogenesis of otitis is often multifactorial in the rabbit. Predisposing factors such as ear conformation increase the risk of otitis in certain breeds. All rabbits have a relatively narrow ear canal, however in Lop-eared rabbits the fold in the ear cartilage is such that the lumen is entirely closed off preventing normal drainage of cerumen from the ear.
Hematological and serum chemistry tests are considered part of the minimum database, yet collecting blood samples from small mammals can be extremely challenging. This review article reviews the recommended venipuncture site in popular exotic companion mammals including many rodents, rabbits, ferrets, hedgehogs, and sugar gliders. Sample collection from peripheral vessels including the cephalic, saphenous, tail, jugular, ear, and submandibular vein is discussed.
Blind venipuncture sites such as the cranial vena cava and femoral vessels are also described. Veterinary health professionals are also acquainted with the potential risks associated with blood collection from these small species, especially those presenting in advanced diseased states. Tips for clinical success are also shared.