SA Differential Diagnoses of Clinical Signs Flashcards
Alopecia
INFLAMMATORY: Infectious, Immune-mediated, Traumatic, Atrophic
NON-INFLAMMATORY: Hormonal, Other (less common)
Anuria & Oliguria
PRE-RENAL: dehydration, hypovolemia, hypotension
RENAL: Infectious, toxic (endo vs exo), ischemic (thrombi), immune-mediated
POST-RENAL: obstruction
Constipation
DIETARY
DRUGS
REFUSAL TO DEFECATE: pain in rectum vs orthopedic
BEHAVIOURAL & ENVIRONMENTAL
COLONIC OBSTRUCTION: intra vs extra luminal
COLONIC WEAKNESS:
- Systemic Dz: Hypercalcemia, hypothyroid, hypokalemia
- Local Neuro Dz: Spinal dz, pelvic nerve dz, dysautonomia, chronic stretch and damage
- Other: idiopathic megacolon in cats, severe dehydration
Coughing
UPPER: inflammatory, infectious, neoplastic, allergic, other
LOWER: inflammatory, parasitic, neoplastic, cardiovascular, non-cardiovascular pulmonary edema, allergic, other
ACUTE Diarrhea
DIET
PARASITES
INFECTIOUS: viral, bacterial, rickettsial
OTHER:
- Gastro: HGE, Intussusception, IBS, Foreign body
- Non- gastro: Toxins, Drugs, Pancreatitis, Hypoadrenocorticism, Peritonitis, Pyometra
CHRONIC Diarrhea
SMALL INTESTINAL: Food intolerance, IBD, Neoplasia, Parasitic, EPI, Obstruction/ Intussusception, Liver disease, Endocrine (hypoadreno, hypothyroid, hyperthyroid), Renal disease, Intestinal lymphangiectasia
LARGE INTESTINAL: Food Intolerance, IBD (4 types), Neoplasia, Parasitic
Epistaxis
LOCAL: Neoplasia, FB, Infectious (parasite, fungal), Dental dz + fistula, eosinophilic & lymphoplasmacytic rhinitis
SYSTEMIC: thrombocytopenia, thrombocytopathia (1 Vwb dz or 2 Uremia, multiple myeloma, NSAIDs), Coagulation factor deficits, acquired coagulopathies, systemic hypertension, increased capillary fragility
Fever of Unknown Origin
INFECTIOUS- bacteria, viral, fungal, rickettsial, protozoal
NEOPLASIA
IMMUNE-MEDIATED
INFLAMMATORY- Hypertrophic osteodystrophy, juvenile cellulitis, pancreatitis, panosteitis, panniculitis
OTHER- hyperthyroidism, certain Ab’s, metabolic bone dz, PSS, Shar-pei fever
Head Tilt
PERIPHERAL: otitis interna/ media, middle ear tumor, trauma, aminoglycoside toxicity, feline idiopathic vestibular dz, geriatric canine vestibular dz
CENTRAL: trauma/ hemorrhage, infectious inflammatory fever (RMSF, FIP, bacterial, protozoal, mycotic, rickettsial, distemper), granulomatous meningoencephalitis, neoplasia, vestibular infarct, thiamine deficiency, metronidazole toxicity, toxicity, degenerative dz (storage neuropathies, demyelinating dz), hydrocephalus
Horner Syndrome: Apply Phenylephrine eye drops –> No pupillary dilation (assume pre-ganglionic lesion)
FIRST ORDER (Central): Intracranial dz, C1-C3 spinal myelopathy
SECOND ORDER (Pre-ganglionic): T1-T3 spinal cord lesion, Thoracic dz, brachial plexus avulsion, skull based tumour
Horner Syndrome: Apply Phenylephrine eye drops –> Pupillary dilation (assume post-ganglionic)
THIRD ORDER (post-ganglionic): FeLV/FIV, otitis media/ interna, otic mass, retrobulbar injury/ mass, idiopathic (most common especially in Goldens)
Hyperthermia
FEVER
HEAT STROKE
Exercise hyperthermia- seizures, hypocalcemic tetany
Pathologic etiologies- hyperthyroidism, malignant hyperthermia
Icterus (Jaundice)
PRE-HEPATIC (hemolysis): autoimmune, infectious, toxic (drugs/ food), fragmentation, snake/ brown recluse spider, bee venoms
HEPATIC: cholangiohepatitis, cirrhosis, diffuse neoplasia, toxic hepatopathy, hepatic lipidosis, FIP, Parasitic
POST-HEPATIC biliary obstruction: pancreatitis, enteritis/ cholecystitis, trauma, neoplasia, calculus, stricture, mucocele, ruptured bile duct or gallbladder
Joint Swelling
TRAUMA
DEGENERATIVE JOINT DZ
NEOPLASIA
INFLAMMATORY INFECTIOUS: bacterial, fungal, lyme, rickettsial, leishmaniasis, anaplasmosis, mycoplasma, viral (calicivirus, canine distemper)
INFLAMMATORY NON-INFECTIOUS:
- Erosive: Rheumatoid arthritis, erosive polyarthritis of Greyhounds, Feline chronic progressive polyarthritis
- Non-Erosive: Immune-mediated polyarthritis, Systemic lupus erythromatosis, breed-specific arthritis syndromes, lymphocytic/ plasmacytic synovitis, Drug reactions (TMS in Doberman), Chronic infection causing secondary immune-mediated polyarthritis
Lameness
ORTHOPAEDIC: Trauma, Infectious, Immune-mediated polyarthritis, Degenerative (DJD, cruciate dz, hip dysplasia, elbow dysplasia), developmental (patellar luxation, OCD, panosteitis, HOD, avascular necrosis, ununited anconeal process, bone cysts, radial agenesis), Metabolic (panosteitis, HOD, diabetic neuropathy), Nutritional (Vit D deficiency), Neoplasia
MUSCLES: Trauma (contusion, strain, laceration, rupture, contracture), Inflammatory (polymyositis, dermatomyositis), Infectious (protozoal myositis)
TENDONS/ LIGAMENTS: Sprain/Strain, Hyperextension, Tear, Rupture
note:
strain = muscle-tendon injury
sprain = ligament injury
Pallor
ANEMIA:
- Regenerative: IMHA, erythrocyte parasite, fragmentation, oxidative injury, blood loss
- Non-regenerative: anemia of chronic disease, anemia of renal disease, FeLV, Endocrine (mild in hypoadreno and hypothyroid), Bone marrow suppression or toxicity
SHOCK:
- Cardiogenic: ↓ ventricular function, ↓ ventricular filling, outflow obstruction (intrathoracic tumors, stenosis, hypertrophic obstructive cardiomyopathy, heartworm disease, thrombosis, severe arrythmia)
- Non-cardiogenic trauma, hypovolemia, disruption in blood flow (sepsis, endotoxemia, hypotension)