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Wissenswertes über "Increased Abdominal Pressure"
Increased abdominal pressure refers to a pathological rise in pressure within the abdominal cavity. It can affect multiple organs and requires medical evaluation when severe.
What Is Increased Abdominal Pressure?
Increased abdominal pressure – also referred to as elevated intra-abdominal pressure (IAP) – describes a pathological rise in pressure within the abdominal cavity. Under normal circumstances, IAP in adults ranges from 0 to 5 mmHg. Values above 12 mmHg are classified as intra-abdominal hypertension (IAH), while values exceeding 20 mmHg accompanied by new organ dysfunction define the abdominal compartment syndrome (ACS) – a potentially life-threatening condition.
Causes
Increased abdominal pressure can result from a variety of underlying conditions:
- Fluid accumulation: Ascites (fluid in the abdomen), intra-abdominal bleeding or hematomas
- Organ enlargement: Tumors, ileus (bowel obstruction), gastric distension
- Inflammation: Peritonitis, acute pancreatitis
- Post-surgical states: Following major abdominal or vascular surgery
- Trauma: Blunt abdominal injuries
- Functional factors: Obesity, pregnancy, chronic constipation
Symptoms
The clinical signs of increased abdominal pressure depend on the degree of pressure elevation and the organ systems involved:
- Tense, distended abdomen
- Respiratory insufficiency caused by upward displacement of the diaphragm
- Reduced urine output (oliguria) or acute kidney injury
- Reduced bowel motility, nausea, and vomiting
- Circulatory instability and elevated ventilation pressures in mechanically ventilated patients
- Altered consciousness in severe cases
Diagnosis
IAP is most commonly measured indirectly via intravesical pressure measurement (bladder pressure monitoring). A urinary catheter is used to measure bladder pressure, which correlates closely with intra-abdominal pressure. Additional diagnostic tools include:
- Physical examination (inspection, palpation, percussion of the abdomen)
- Imaging: abdominal ultrasound, CT scan
- Laboratory tests: renal function markers, blood gases, inflammatory markers
Classification According to WSACS
The World Society of the Abdominal Compartment Syndrome (WSACS) classifies intra-abdominal hypertension into four grades:
- Grade I: 12–15 mmHg
- Grade II: 16–20 mmHg
- Grade III: 21–25 mmHg
- Grade IV: above 25 mmHg
Treatment
Treatment depends on the underlying cause and severity of the pressure elevation:
- Conservative measures: Nasogastric decompression, prokinetic medications to stimulate bowel motility, adequate pain management, and restricted fluid administration
- Decompressive interventions: Paracentesis to drain ascites, percutaneous drainage of hematomas or abscesses
- Surgical treatment: In severe abdominal compartment syndrome, surgical decompression via laparotomy with an open abdomen may be required
- Intensive care support: Monitoring and stabilization of organ functions including mechanical ventilation and renal replacement therapy
Significance and Prognosis
Untreated or late-recognized increased abdominal pressure can progress to multi-organ failure. Early identification – especially in intensive care settings – is critical for a favorable outcome. The mortality rate of manifest abdominal compartment syndrome is high without prompt intervention.
References
- Kirkpatrick AW et al. - Intra-abdominal hypertension and the abdominal compartment syndrome: updated consensus definitions and clinical practice guidelines from the World Society of the Abdominal Compartment Syndrome. Intensive Care Med, 2013.
- Malbrain ML et al. - Results from the International Conference of Experts on Intra-abdominal Hypertension and Abdominal Compartment Syndrome. Intensive Care Med, 2006.
- Leppäniemi A et al. - WSES guidelines for the management of abdominal compartment syndrome. World Journal of Emergency Surgery, 2019.
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