{
  "slug": "veterinary-animal-medicine",
  "title": "Veterinary Medicine & Surgery",
  "domain_slug": "veterinary",
  "subdomain_slug": null,
  "difficulty": "intermediate",
  "tags": [
    "veterinary-surgery",
    "animal-pharmacology",
    "diagnostic-imaging",
    "emergency-medicine",
    "anesthesiology"
  ],
  "is_free": false,
  "token_count": 3750,
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  "savings_pct": 13.0,
  "rosetta": "[DECODE] Dx=diagnosis|Tx=treatment|Sx=symptoms|Hx=history|Px=prognosis|PE=physical examination|DDx=differential diagnosis|CBC=complete blood count|BMP=basic metabolic panel|BW=body weight|PO=per os (by mouth)|IV=intravenous|IM=intramuscular|SQ=subcutaneous|SID=once daily|BID=twice daily|TID=three times daily|QID=four times daily|PRN=as needed|GI=gastrointestinal|CVS=cardiovascular system|CNS=central nervous system|NSAID=nonsteroidal anti-inflammatory drug|GDV=gastric dilatation-volvulus|TPR=temperature pulse respiration|CRT=capillary refill time",
  "content_compressed": "# Veterinary Medicine & Surgery Knowledge Pack\n\n## Clinical Assessment\n\n### Systematic Physical Examination\nEvery PE follows a consistent, head-to-tail approach to avoid missing findings:\n\n**General assessment**: Body condition score (1-9 scale for dogs/cats; 1-5 for horses/cattle), mentation (alert, quiet, obtunded, stuporous, comatose), posture, gait, hydration status (skin turgor, mucous membrane moisture, eye position in orbit). TPR: Normal canine temp 100.5-102.5\u00b0F, HR 60-140 (size-dependent), RR 10-30. Normal feline temp 100.5-102.5\u00b0F, HR 140-220, RR 20-40. Equine temp 99-101.5\u00b0F, HR 28-44, RR 8-16.\n\n**Mucous membranes**: Color (pink=normal, pale=anemia/poor perfusion, yellow=icterus, brick red=vasodilation/sepsis, cyanotic=hypoxemia), CRT (normal <2 seconds; >2 seconds suggests poor perfusion; <1 second suggests hyperdynamic state). Petechiae on mucous membranes indicate thrombocytopenia or vasculitis.\n\n**Cardiovascular**: Auscultate all four quadrants (left apex, left base, right side). Grade murmurs I-VI: I (barely audible), II (soft but readily heard), III (moderate, no thrill), IV (loud with palpable thrill), V (very loud, thrill), VI (heard with stethoscope off chest). Note timing (systolic, diastolic, continuous), point of maximum intensity, and radiation. Common murmurs: mitral regurgitation (left apex, systolic) \u2014 most common acquired heart disease in dogs; subaortic stenosis (left base, systolic) \u2014 common congenital in large-breed dogs.\n\n**Abdominal palpation**: In small animals, systematic palpation identifies organomegaly, masses, fluid, pain, and foreign bodies. Cranial abdomen: liver, stomach, spleen. Mid-abdomen: small intestines, kidneys. Caudal abdomen: bladder, colon, sublumbar lymph nodes. A palpable thickened intestinal loop raises DDx of lymphoma, inflammatory bowel disease, foreign body, or intussusception.\n\n### Emergency Triage\nThe primary survey follows the ABCDE approach:\n\n**Airway**: Patent? Obstructed by blood, vomitus, foreign body, or swelling? Brachycephalic breeds (Bulldogs, Pugs) have inherently compromised airways \u2014 laryngeal edema after trauma or anesthesia can be rapidly fatal. Intubation or emergency tracheostomy may be needed.\n\n**Breathing**: Rate, depth, effort, pattern. Increased effort with short/shallow breaths suggests pleural space disease (pneumothorax, pleural effusion, diaphragmatic hernia). Thoracocentesis is both diagnostic and therapeutic \u2014 aspirating air or fluid from the pleural space provides immediate relief while you stabilize.\n\n**Circulation**: HR, pulse quality, CRT, blood pressure. Shock classification: hypovolemic (hemorrhage, dehydration \u2014 tachycardia, poor pulses, prolonged CRT), distributive (sepsis, anaphylaxis \u2014 vasodilation, bounding pulses initially then decompensation), cardiogenic (heart failure \u2014 muffled heart sounds with pericardial effusion, jugular distension). Fluid resuscitation: crystalloid bolus 10-20 mL/kg IV over 15-20 minutes for dogs (reassess after each bolus \u2014 cats are more volume-sensitive, use 5-10 mL/kg).\n\n**Dysfunction (neurological)**: Mentation, pupil size and responsiveness, ability to walk, voluntary movement of all limbs. Modified Glasgow Coma Scale for head trauma patients \u2014 serial scores track deterioration or improvement.\n\n**Exposure**: Complete secondary survey once stabilized \u2014 clip fur to find wounds, radiograph for fractures, focused assessment with sonography for trauma (FAST scan) to detect free abdominal or thoracic fluid.\n\n## Common Surgical Procedures\n\n### Soft Tissue Surgery\n**Ovariohysterectomy (spay)**: Most commonly performed small-animal surgery. Ventral midline approach, ligate ovarian pedicles (triple clamp technique or vessel-sealing device), ligate uterine body at cervix, remove uterus and ovaries. Complications: hemorrhage from slipped ligature (most dangerous \u2014 ovarian pedicle bleeds into abdomen; signs appear 12-48 hours post-op: weakness, pale mucous membranes, abdominal distension), ureteral ligation (iatrogenic \u2014 rare but devastating), and stump pyometra (if ovarian tissue remains).\n\n**GDV (gastric dilatation-volvulus)**: Life-threatening emergency in deep-chested large breeds (Great Danes, German Shepherds, Standard Poodles). Stomach distends with gas and rotates 180-360\u00b0 on its mesenteric axis, occluding venous return and gastric blood supply. Presentation: non-productive retching, abdominal distension, tachycardia, weak pulses, rapid decline.\n\nTx: Aggressive IV fluid resuscitation (90 mL/kg/hr shock rate initially), gastric decompression (trocar or orogastric tube), correct metabolic derangements (ECG monitoring \u2014 ventricular arrhythmias occur in 40% of cases, treat with lidocaine 2 mg/kg IV bolus if hemodynamically significant). Surgical correction: derotate stomach, assess gastric wall viability (black/green necrotic tissue requires partial gastrectomy \u2014 CFR increases to 35-50% with necrosis), splenectomy if splenic torsion or avulsion, and gastropexy (permanently fix stomach to body wall \u2014 without gastropexy, recurrence rate is 80%).\n\n### Orthopedic Surgery\n**Cranial cruciate ligament (CCL) rupture**: Most common orthopedic condition in dogs. Equivalent to human ACL tear but with different biomechanics \u2014 the canine tibial plateau slopes 20-30\u00b0 posteriorly, creating constant cranial tibial thrust during weight-bearing. Degenerative rupture is more common than traumatic in dogs; 40-60% of dogs will rupture the contralateral CCL within 1-2 years.\n\nSurgical options: Tibial plateau leveling osteotomy (TPLO) \u2014 rotational osteotomy of the proximal tibia to reduce tibial plateau angle to ~5\u00b0, eliminating cranial thrust. Current gold standard for medium-to-large dogs. Tibial tuberosity advancement (TTA) \u2014 advances the patellar tendon insertion point to neutralize shear forces. Lateral suture stabilization (extracapsular repair) \u2014 heavy suture from lateral fabella to tibial tuberosity, suitable for small dogs (<15 kg BW). Return to function: 90-95% achieve good to excellent outcomes with TPLO; full recovery takes 12-16 weeks with strict exercise restriction.\n\n**Fracture repair**: Principles follow AO/ASIF guidelines. Fracture classification: open vs. closed, transverse vs. oblique vs. spiral vs. comminuted, articular vs. non-articular. Fixation methods: bone plates and screws (locking plates especially valuable in small patients and poor-quality bone), interlocking nails (long bones in medium-large dogs), external fixation (open fractures, severely contaminated wounds, or temporary stabilization). Cats heal fractures faster than dogs (typically 6-8 weeks vs. 8-12 weeks). Young animals heal faster still \u2014 puppies may consolidate fractures in 3-4 weeks.\n\n## Anesthesia and Analgesia\n\n### Pre-anesthetic Assessment\nASA status classification adapted for veterinary patients: ASA I (healthy), ASA II (mild systemic disease \u2014 compensated heart murmur, mild obesity), ASA III (severe systemic disease \u2014 significant cardiac disease, uncontrolled endocrine disease), ASA IV (life-threatening \u2014 GDV, hemoabdomen), ASA V (moribund, not expected to survive without surgery). Pre-anesthetic bloodwork: minimum CBC and BMP for ASA I-II; full panel including coagulation for ASA III+.\n\n### Protocol Design\nBalanced anesthesia combines multiple drug classes to minimize individual drug doses and side effects:\n\n**Pre-medication**: Sedation + analgesia. Acepromazine (0.01-0.05 mg/kg IM \u2014 avoid in hypovolemic patients, causes vasodilation) or dexmedetomidine (5-20 mcg/kg IM \u2014 provides profound sedation and analgesia, can reverse with atipamezole, avoid in cardiac patients due to bradycardia and increased afterload). Combine with an opioid: hydromorphone (0.05-0.1 mg/kg IM) or methadone (0.3-0.5 mg/kg IM) for moderate-to-severe pain; butorphanol (0.2-0.4 mg/kg IM) for mild pain and sedation synergy.\n\n**Induction**: Propofol (4-6 mg/kg IV to effect \u2014 give slowly, watch for apnea; dose reduced 30-50% with effective pre-medication) or alfaxalone (2-3 mg/kg IV). Ketamine (5 mg/kg IV) combined with a benzodiazepine (midazolam 0.2-0.3 mg/kg IV) for cardiovascularly compromised patients \u2014 ketamine maintains sympathetic tone.\n\n**Maintenance**: Isoflurane or sevoflurane via endotracheal tube. MAC (minimum alveolar concentration) for isoflurane: dogs 1.3%, cats 1.6%. MAC is reduced by concurrent analgesics \u2014 effective multimodal analgesia can reduce inhalant requirements by 30-50%, improving cardiovascular stability.\n\n### Multimodal Analgesia\nPain management uses multiple mechanisms to provide superior analgesia with fewer side effects:\n\n**NSAIDs**: Meloxicam (0.1 mg/kg PO SID for dogs; 0.05 mg/kg PO SID for cats \u2014 lower dose, shorter course in cats due to limited glucuronidation). Carprofen (4.4 mg/kg PO SID or 2.2 mg/kg BID for dogs). Contraindicated in dehydrated patients, renal insufficiency, GI ulceration, or concurrent corticosteroid use.\n\n**Local/regional anesthesia**: Lidocaine (max 4 mg/kg dogs, 2 mg/kg cats; onset 5-10 min, duration 1-2 hrs). Bupivacaine (max 2 mg/kg dogs, 1 mg/kg cats; onset 20 min, duration 4-6 hrs). Techniques: incisional line blocks, dental nerve blocks (inferior alveolar, infraorbital, mental \u2014 transform dental procedures), epidural (morphine 0.1 mg/kg + bupivacaine 1 mg/kg preservative-free at L7-S1 for hindlimb/abdominal surgery), and ultrasound-guided peripheral nerve blocks (femoral/sciatic for hindlimb, brachial plexus for forelimb).\n\n**Constant rate infusions (CRI)**: Fentanyl (2-5 mcg/kg/hr IV), ketamine (0.5 mg/kg loading then 10 mcg/kg/min \u2014 NMDA antagonist, prevents wind-up), and lidocaine (1-2 mg/kg loading then 25-50 mcg/kg/min IV \u2014 analgesic, anti-inflammatory, prokinetic; DO NOT use lidocaine CRI in cats \u2014 fatal CNS toxicity at therapeutic dog doses). MLK (morphine-lidocaine-ketamine) CRI is a common multimodal protocol for dogs undergoing major surgery.\n\n## Diagnostic Imaging\n\n### Radiography\nSystematic ABCDE approach for abdominal radiographs: A (abdomen \u2014 serosal detail, peritoneal fluid, free gas), B (bowel \u2014 gas pattern, diameter [small intestine >2x width of a rib or >3x height of L5 endplate suggests obstruction in dogs], foreign material), C (colon/cecum), D (density \u2014 masses, calcifications, uroliths), E (edges \u2014 liver size, kidney size/shape, spleen, bladder, sublumbar space).\n\nThree-view thoracic radiographs (right lateral, left lateral, VD/DV) are standard. Heart size assessed by vertebral heart score (VHS): measure long and short axes of cardiac silhouette, sum in vertebral bodies starting at T4. Normal canine VHS 9.7\u00b10.5, normal feline VHS 7.5\u00b10.3. VHS >10.5 (dogs) or >8.1 (cats) suggests cardiomegaly.\n\n### Ultrasound\nAbdominal ultrasound is the first-line imaging for parenchymal organ evaluation. Liver: assess echogenicity relative to falciform fat (hyperechoic liver suggests hepatic lipidosis in cats, steroid hepatopathy in dogs), portal vasculature, gallbladder (mucocele = stellate/kiwi-fruit pattern \u2014 consider surgery before rupture). Spleen: focal masses have 50-70% malignancy rate in dogs (hemangiosarcoma most common). Kidneys: cortical-medullary distinction, pelvic dilation, calculi, infarcts. FAST scan protocol (AFAST/TFAST) takes <5 minutes and detects free fluid \u2014 invaluable in emergency triage."
}