What is bloat and why is it an emergency
Bloat (GDV) is a fatal emergency where a dog's stomach twists, cutting off blood flow. Immediate surgery is required to save the dog's life.
Yes, bloat is a life-threatening emergency requiring immediate veterinary surgery. The condition, known as gastric dilatation volvulus (GDV), involves the stomach twisting on itself, cutting off blood supply and causing shock within hours. Without prompt intervention, mortality rates range from 10 to 60%, even with treatment.
Why the stomach twist is fatal
The stomach does not just fill with gas; it rotates around its axis, typically twisting 180 to 360 degrees clockwise. Once the rotation exceeds 180 degrees, the esophagus is sealed shut, preventing the dog from belching or vomiting to relieve the pressure. This creates a closed loop where gas continues to build, compressing the diaphragm and the caudal vena cava, the major vein returning blood to the heart. The result is a rapid drop in blood pressure, ischemia of the stomach tissue, and systemic shock. The pressure on the portal vein also stops the liver from filtering toxins and bacteria from the blood, leading to sepsis.
Who is most at risk
Breed matters more than size alone, specifically the depth of the chest. Deep-chested breeds with a high thorax-to-width ratio are significantly more likely to develop GDV. The Great Dane is the most affected, with a lifetime risk estimated between 37% and 42.4%, making them the focus of most research. Other high-risk breeds include the Weimaraner, St. Bernard, Irish Setter, Irish Wolfhound, and Standard Poodle. Even within these breeds, genetics play a role; specific alleles of the DLA88, DRB1, and TLR5 genes, which are part of the immune system, have been linked to a higher risk. Interestingly, obesity appears to be protective, with underweight dogs being at higher risk than obese ones.
Recognizing the signs
Owners often mistake the symptoms for simple indigestion, but the distress is extreme. A dog with GDV will stand uncomfortably, often pacing or assuming a "praying position" with front legs down and rear end up. The abdomen becomes firm and distended, a condition called tympany. The most telling sign is retching without producing any vomitus; the dog is trying to vomit but the twisted stomach blocks the outflow. Other symptoms include hypersalivation, weakness, depression, and difficulty breathing. In 40% of cases, cardiac arrhythmias develop, which can be fatal on their own. If the dog is unable to walk or appears comatose, the likelihood of death increases dramatically.
What causes the twist
The exact mechanism is still debated, but the immediate prerequisite is a dysfunction of the sphincter between the esophagus and stomach combined with an obstruction of the pylorus. While theories involving hypergastrinaemia or impaired gastric myoelectricity exist, studies have not found consistent evidence to support them. Stress is a known risk factor, likely impairing gastrointestinal function, though the exact manner remains unclear. Dietary factors also play a role; feeding once daily or using food particles smaller than 30 mm increases risk. Conversely, raising food bowls, a common past recommendation, has been shown to increase the risk of GDV.
How it is treated
Stabilization is the first priority before any surgical attempt can be made. The dog requires intravenous fluid therapy to normalize blood pressure and perfusion, often followed by antiarrhythmic drugs to stabilize the heart. Decompression of the stomach is attempted via a large catheter or an orogastric tube to relieve pressure, though these carry risks of spleen laceration or perforation. The definitive treatment is exploratory laparotomy, where the stomach is manually rotated back to its normal position. During this surgery, a gastropexy is performed, suturing the stomach wall to the abdominal wall to prevent recurrence. Without this procedure, up to 80% of dogs will suffer a recurrence.
Prognosis and prevention
Time is the most critical factor. A delay in treatment greater than six hours, or the presence of sepsis, hypotension, or necrotic stomach tissue, drastically reduces survival chances. Dogs that are comatose are 36 times more likely to die than those that are alert. While the prognosis is guarded, mortality rates have improved to 10 to 40% with prompt treatment and good preoperative stabilization. Prevention focuses on feeding small meals throughout the day rather than one large meal and avoiding vigorous exercise immediately before or after eating. Prophylactic gastropexy is recommended for high-risk breeds or dogs with a family history of the condition.