⚡ Time is Critical

GDV is one of the most time-sensitive emergencies in veterinary medicine. Mortality increases dramatically with every hour of delay. If GDV is suspected, immediate referral to a 24-hour emergency facility with surgical capability is essential. Do not delay for diagnostics — rapid stabilization and surgery are the only chance for survival.

Overview

Gastric Dilatation-Volvulus (GDV), commonly called "bloat," is a catastrophic emergency in which the stomach fills with gas and food, then rotates on its mesenteric axis (volvulus). This rotation traps the gastric contents, compresses the caudal vena cava (reducing venous return), obstructs gastric blood supply (causing ischemia and necrosis), and can rapidly progress to shock, sepsis, and death. The exact mechanism is not fully understood but involves gastric ligament laxity, anatomy (deep thorax), gastric distension, and activity after eating. GDV is uniformly fatal without surgery and even with treatment carries a 15–30% mortality rate depending on the degree of shock, tissue necrosis, and speed of intervention.

Common Clinical Signs

Non-productive retching (attempting to vomit without bringing anything up) Abdominal distension (often visibly enlarged, tympanic on percussion) Restlessness, pacing, unable to get comfortable Hypersalivation / drooling Weakness and collapse Pale or cyanotic mucous membranes Tachycardia (often >140 bpm) Rapid, shallow breathing Abdominal pain on palpation Weak femoral pulses Signs of shock (weakness, tachycardia, poor CRT)

Diagnostic Approach

Diagnosis should be based on history and clinical presentation — do not delay treatment waiting for confirmatory imaging. If the patient is stable enough, a lateral abdominal radiograph can confirm the diagnosis.

Diagnostic Test Expected Findings
Abdominal Radiograph (VD/Lateral) "Mega-stomach" sign: severely distended, gas-filled stomach positioned in right dorsal abdomen. Pylorus displaced dorsally and to the left. May see a "double bubble" or compartmentalization. Classic sign: greater curvature of stomach extends beyond the transverse colon on VD view.
Abdominocentesis / Gastric decompression Passing an orogastric tube may be difficult or impossible if the cardia is rotated shut. Successful passage with large-volume gas release strongly suggests dilatation (without volvulus). If tube cannot pass and tympany persists, volvulus is confirmed.
Complete Blood Count (CBC) Hemoconcentration (PCV >55% in dogs) from fluid shifts into the peritoneal cavity. Often marked leukocytosis with a left shift due to stress and endotoxemia. May show thrombocytopenia if DIC is developing.
Serum Chemistry Panel Electrolyte disturbances: hypokalemia, hypochloremia, hyponatremia from gastric sequestration. Lactate is almost universally elevated — a lactate >6 mmol/L on admission is a negative prognostic indicator. Elevated BUN from prerenal azotemia secondary to shock.
Blood Gas Analysis Metabolic acidosis with base deficit from lactate accumulation and tissue hypoperfusion. Mixed venous blood gas is ideal to assess tissue oxygenation.
Coagulation Profile Prolonged PT/PTT if consumptive coagulopathy (DIC) is developing — a grave sign indicating severe systemic inflammation and endothelial injury.

Differential Diagnoses

Rule out these conditions before settling on GDV. The key differentiator is the combination of acute abdominal distension + non-productive retching + signs of shock in a large, deep-chested breed.

  • Simple gastric dilatation — Gas distension without volvulus. May follow large meal. Tube passes easily, patient improves rapidly with decompression. Does not cause the degree of shock seen in GDV.
  • Gastric outflow obstruction — Pyloric stenosis or foreign body. Gradual onset. Abdominal distension less marked. Radiographs show gastric distension without the compartmentalized appearance of volvulus.
  • Intestinal obstruction — Foreign body or intussusception. Abdominal distension present but may be more distal. Radiographs show dilated small intestine with air-fluid levels. Usually in younger dogs.
  • Acute hemorrhagic diarrhea syndrome (AHDS) — Profuse bloody diarrhea is the primary sign. Abdominal distension absent or mild. Rapid onset of depression but not the classic GDV progression.
  • Ruptured abdominal tumor (hemangiosarcoma) — Acute hemorrhagic shock with abdominal distension. Usually in older large-breed dogs (similar signalment). May have a history of prior weakness episodes.
  • Peritonitis from GI perforation — Severe pain and shock. Free gas on radiographs. Usually preceded by history of foreign body ingestion or NSAID/steroid use.

Prognosis & When to Refer

GDV is a surgical emergency. Any suspected case should be referred immediately to a facility with 24-hour surgical capacity. Preoperative stabilization includes: IV fluid therapy, gastric decompression (orogastric tube or trochar), analgesia, and broad-spectrum antibiotics. Surgery involves gastric derotation, removal of necrotic tissue, and prophylactic gastropexy (suturing the stomach to the body wall to prevent recurrence). Even with optimal treatment, 15–30% of dogs die. Prognosis worsens with: delayed presentation (>6 hours), marked lactate elevation (>6 mmol/L), signs of splenic involvement, need for partial gastrectomy, and cardiac arrhythmias at presentation.