Gastric volvulus

Lore & Background

Gastric volvulus occurs when the stomach twists more than 180 degrees, obstructing the flow of material and potentially cutting off blood supply. The twisting can be organoaxial (around the long axis, connecting the gastroesophageal junction and pylorus) or mesenteroaxial (around an axis bisecting the lesser and greater curvatures). Organoaxial volvulus is more common (59% of cases) and more likely to cause obstruction, while mesenteroaxial volvulus (29% of cases) is more associated with ischemia. A combined type is rare and usually seen in chronic cases.

Reader's Guide

The significance of gastric volvulus lies in its potential for rapid progression to gastric strangulation, necrosis, and perforation, which historically led to mortality rates of 30–50% for acute cases. With advances in diagnosis and management, the mortality rate for acute gastric volvulus has decreased to 15–20%, and for chronic cases to 0–13%. Diagnosis is often made via barium studies or CT scanning, which can show characteristic findings such as an upside-down stomach or two air-fluid levels. The condition is frequently associated with diaphragmatic defects, including hiatal hernias in about one third of cases. Prompt surgical treatment is essential, as nonoperative management carries a mortality rate as high as 80%. The classic Borchardt's triad—severe epigastric pain, retching without vomiting, and inability to pass a nasogastric tube—occurs in 70% of cases and aids clinical recognition.

Did You Know?

• Organoaxial gastric volvulus occurs in approximately 59% of cases and is usually associated with diaphragmatic defects.
• The classic triad of gastric volvulus, described by Borchardt in 1904, reportedly occurs in 70% of cases.
• Nonoperative mortality for gastric volvulus is reportedly as high as 80%.
• In mesenteroaxial volvulus, plain abdominal radiographs may show two air-fluid levels on erect images.

Anatomy of the Twist: Classification and Pathophysiology

Gastric volvulus is defined as a rotation exceeding 180 degrees of all or part of the stomach, producing obstruction of gastric contents, variable compromise of blood flow, and possible tissue death. The condition is divided into two principal patterns based on the axis of rotation. In the organoaxial form, the stomach pivots along the line joining the gastroesophageal junction to the pylorus, causing the antrum and fundus to swing in opposite directions. This is the predominant variant, accounting for roughly 59 percent of cases, and it tends to be linked with diaphragmatic defects. Strangulation and necrosis are well documented in this type, appearing in five to twenty-eight percent of affected patients. The mesenteroaxial variant, seen in about 29 percent of cases, involves rotation around an axis that bisects the lesser and greater curvatures, pushing the antrum forward and upward so that the posterior gastric wall faces anteriorly. This rotation is typically incomplete and intermittent, and vascular compromise is less frequent. A rare combined form, in which both rotational patterns coexist, accounts for the remaining cases and is usually encountered in patients with chronic volvulus. Clinically, organoaxial twisting carries a greater risk of complete obstruction, whereas mesenteroaxial twisting is more strongly associated with ischemic injury.

The Classic Triad and Clinical Presentation

In 1904, Borchardt described a constellation of three findings that has since become the hallmark clinical picture of gastric volvulus. The triad consists of severe epigastric pain, retching without productive vomiting (often accompanied by a sour taste in the mouth), and the inability to pass a nasogastric tube into the stomach. This combination is reportedly present in approximately 70 percent of cases, making it a highly suggestive diagnostic clue when all three elements are present simultaneously. Beyond the triad, some patients experience severe pain at the top of the left shoulder. This referred discomfort is thought to arise when internal bleeding irritates the diaphragm during respiration, transmitting pain to the shoulder region. The underlying pathology—twisting of the stomach beyond 180 degrees—produces a mechanical blockage to the passage of gastric contents, a variable degree of vascular compromise, and, in the most severe presentations, frank tissue necrosis. The interplay between obstruction and ischemia determines the urgency of the clinical picture and the risk of catastrophic complications such as perforation.

Imaging and Endoscopic Diagnosis

Diagnosing gastric volvulus relies heavily on imaging and, in select cases, endoscopy. On chest radiography, a retrocardiac gas-filled structure may be visible when the stomach has migrated into the thorax, confirming an intrathoracic position. Plain abdominal films reveal a massively distended viscus in the upper abdomen. The specific pattern of the twist can often be discerned: organoaxial volvulus may show a horizontally oriented stomach with a single air-fluid level and little distal gas, while mesenteroaxial volvulus presents as a spherical stomach on supine images with two air-fluid levels on erect views and the antrum positioned above the fundus. Barium or Gastrografin contrast studies remain a sensitive and specific tool when performed while the stomach is in its twisted state, sometimes revealing an upside-down configuration, with a reported diagnostic yield of 81 to 84 percent. Computed tomography offers rapid diagnosis by displaying two gas bubbles separated by a transition line, and additionally allows detection of gastric pneumatosis, free air, predisposing hernias, and exclusion of other abdominal pathology. Upper GI endoscopy can support the diagnosis when gastric anatomy appears distorted and intubation of the stomach or pylorus is difficult; in late-stage disease, ischemic ulceration or mucosal fissuring may be visualized.

Etiology, Treatment, and Outcomes

The causes of gastric volvulus fall into two broad categories. In roughly two thirds of cases, the etiology is unknown, and the condition is presumed to result from abnormal laxity of the gastrosplenic, gastroduodenal, gastrophrenic, and gastrohepatic ligaments. This so-called Type 1 presentation is more common in adults, though it has been reported in children as well. The remaining one third, classified as Type 2, is associated with congenital or acquired abnormalities that grant the stomach excessive mobility; about one third of all cases are linked to a hiatal hernia. Surgical intervention is the definitive treatment. The mortality landscape underscores the urgency of timely diagnosis: nonoperative management carries a mortality rate as high as 80 percent. Historically, acute gastric volvulus claimed 30 to 50 percent of patients, with gastric strangulation leading to necrosis and perforation being the principal cause of death. With modern advances in imaging and surgical management, the mortality for acute cases has fallen to 15 to 20 percent, and for chronic presentations it ranges from 0 to 13 percent.