Gastric Volvulus

Gastric Dilatation–Volvulus (GDV) is an acute, rapidly evolving, and life-threatening emergency in dogs that requires immediate veterinary intervention. The condition has a multifactorial origin but is most commonly associated with rapid consumption of large meals. Accumulation of food and gas leads to marked gastric enlargement, which can result in several critical consequences:

• impaired venous return from the abdomen to the heart
• reduced blood supply to the stomach lining
• rupture of the gastric wall
• compression of the diaphragm, limiting lung expansion and compromising normal respiration

In many cases, the distended stomach rotates around its axis, a phenomenon known as gastric volvulus. This rotation can obstruct blood flow to both the stomach and spleen. As the condition progresses and systemic effects persist, secondary complications may develop.

Reduced cardiac output and respiratory efficiency lead to inadequate oxygen delivery to tissues (hypoxia), resulting in cellular injury or death in organs such as the liver and kidneys.
Cardiac arrhythmias frequently occur due to hypoxia.
The lining of the gastrointestinal tract is particularly vulnerable to ischemia and necrosis.
Loss of intestinal integrity may allow bacteria to enter the bloodstream, causing bacteremia and potentially sepsis.

Numerous studies have examined risk factors associated with GDV. Although the exact mechanism is not fully understood, the condition is more commonly observed in dogs that:

• have a deep, narrow chest conformation
• are fed one large meal daily
• are older
• have close relatives with a history of GDV

Additional factors that may increase risk include elevated feeding bowls, prior splenectomy, large or giant breed size, and stress. A study published in 2006 also identified an increased risk in predisposed dogs fed dry foods listing oils (e.g., animal fat, sunflower oil) among the first four ingredients.

GDV has been reported in nearly all breeds, but it is most frequently seen in Great Danes, Weimaraners, Saint Bernards, Irish Setters, and Gordon Setters.

Early clinical signs are typically related to abdominal discomfort and may include:

• restlessness or repeated glancing at the abdomen
• stretching
• excessive drooling
• abdominal enlargement
• unproductive retching

As the disease advances, affected dogs may pant, develop marked abdominal distension, become weak, collapse, or remain recumbent. Physical examination often reveals increased heart and respiratory rates, weak pulses, delayed capillary refill time, and obvious abdominal bloating.

Any dog showing these signs requires immediate veterinary evaluation. Once GDV is diagnosed, surgical intervention is mandatory. Outcomes are significantly improved when stabilization and surgery are performed early, as mortality increases with disease severity. Referral to an ACVS board-certified veterinary surgeon is commonly indicated.

Initial diagnostic evaluation usually includes:

• complete blood count (CBC)
• serum biochemistry and electrolyte analysis
• urinalysis

These tests help assess metabolic derangements and exclude conditions that may mimic GDV.
Abdominal radiographs are essential for confirming the diagnosis.
Electrocardiography (ECG) is commonly performed to detect cardiac arrhythmias, which are frequent later in the disease course.
Blood gas analysis may be used to evaluate the extent of respiratory compromise.
Additional diagnostic tests may be recommended based on patient stability and surgeon discretion.

Because GDV patients are often hemodynamically unstable, preoperative stabilization is critical and typically includes intravenous fluid therapy and oxygen supplementation. If splenic vessel damage and intra-abdominal hemorrhage are suspected, blood transfusion may be required.

Gastric decompression is performed as soon as possible, usually by passing a tube through the esophagus into the stomach to evacuate gas and fluid, often followed by gastric lavage. In some cases, percutaneous needle or catheter decompression is necessary to facilitate tube placement.

Definitive treatment is surgical and involves:

• exploratory laparotomy
• derotation of the stomach
• assessment of stomach, spleen, and other organs for viability

If blood supply is compromised, partial gastrectomy or splenectomy may be required.
Once the stomach is returned to its normal position, it is permanently secured to the abdominal wall via gastropexy, which prevents future volvulus should gastric dilation recur.

Potential intra- and postoperative complications include hypotension, hemorrhage, infection, suture dehiscence, arrhythmias, shock, and death. Most dogs require hospitalization and intensive monitoring for several days postoperatively, including continuous cardiac monitoring.

Transient arrhythmias are common and often resolve without specific treatment. Severe complications may arise from reperfusion injury, caused by the sudden release of toxic metabolites following stomach derotation. This may lead to arrhythmias, acute kidney injury, or liver failure. Prolonged shock can result in multiorgan dysfunction or death.

Reported mortality rates for GDV are approximately 15%. Increased risk of death is associated with dogs that:

• have clinical signs for more than 6 hours
• exhibit preoperative cardiac arrhythmias
• require partial gastrectomy
• require splenectomy

Postoperative care includes strict activity restriction for several weeks. Long-term management typically involves feeding multiple small meals daily rather than one large meal and monitoring for recurrence of clinical signs.

Although gastropexy does not prevent gastric dilation, it effectively prevents life-threatening volvulus. For this reason, prophylactic gastropexy is widely recommended for high-risk breeds and dogs with affected relatives. This procedure may be performed concurrently with routine sterilization and can be achieved using minimally invasive techniques such as laparoscopic-assisted or endoscopic gastropexy.