Diaphragmatic Hernia – Causes, Symptoms and Treatment
A diaphragmatic hernia is a defect in the diaphragm that allows abdominal organs to enter the chest cavity. It can be congenital or acquired and often requires surgical correction.
Things worth knowing about "Diaphragmatic Hernia"
A diaphragmatic hernia is a defect in the diaphragm that allows abdominal organs to enter the chest cavity. It can be congenital or acquired and often requires surgical correction.
What Is a Diaphragmatic Hernia?
A diaphragmatic hernia is a condition in which a defect or gap forms in the diaphragm – the dome-shaped muscle separating the chest cavity (thorax) from the abdominal cavity. Through this opening, abdominal organs such as the stomach, intestines, spleen, or liver can migrate into the chest, compressing or displacing vital thoracic structures, particularly the lungs and heart.
Diaphragmatic hernias are classified by their cause as either congenital (present at birth) or acquired (developing later in life), and by their anatomical location.
Types of Diaphragmatic Hernia
Congenital Diaphragmatic Hernia (CDH)
Congenital diaphragmatic hernia results from incomplete formation of the diaphragm during fetal development. It occurs in approximately 1 in 2,500 to 5,000 live births. The most common subtype is the Bochdalek hernia (posterolateral defect, predominantly left-sided), while the Morgagni hernia (anterior defect) is considerably rarer.
Acquired Diaphragmatic Hernia
Acquired forms arise from external factors such as trauma (e.g., blunt or penetrating abdominal or thoracic injuries), chronic increases in intra-abdominal pressure, or post-surgical complications. The most common acquired form is the hiatal hernia, in which part of the stomach protrudes upward through the esophageal hiatus into the chest.
Causes
- Genetic factors: Mutations in several genes can impair diaphragmatic development.
- Embryological developmental failure: Incomplete closure of the pleuroperitoneal canal during weeks 8–10 of gestation.
- Trauma: Blunt or penetrating injuries to the trunk.
- Increased intra-abdominal pressure: Chronic coughing, straining, or obesity (especially linked to hiatal hernia).
- Post-operative complications: Diaphragmatic weakening following thoracic or abdominal surgery.
Symptoms
In Newborns (Congenital Form)
- Immediate respiratory distress after birth
- Cyanosis (bluish discoloration of skin and lips)
- Scaphoid (sunken) abdomen
- Displaced heart position (dextrocardia)
- Absent or reduced breath sounds on the affected side
In Adults (Acquired Form)
- Heartburn and acid reflux (typical of hiatal hernia)
- Chest pain or pressure
- Difficulty swallowing (dysphagia)
- Shortness of breath during physical activity
- Often asymptomatic in small defects
Diagnosis
Diagnostic methods vary depending on the type of hernia and the age of the patient:
- Prenatal ultrasound: Routinely performed at the 18–20 week anomaly scan; fetal MRI may be used for further assessment.
- Chest X-ray: Reveals bowel loops or abdominal organs in the thoracic cavity.
- Computed tomography (CT): Provides detailed imaging, especially in traumatic hernias.
- Endoscopy: Used to evaluate the esophagus and stomach in hiatal hernia.
- pH-metry and manometry: Measure acid reflux and esophageal pressure.
Treatment
Congenital Diaphragmatic Hernia
Treatment of congenital diaphragmatic hernia is a neonatal emergency managed in specialized pediatric surgery and neonatology centers. Initial stabilization includes mechanical ventilation and intensive care support. In severe cases, ECMO (extracorporeal membrane oxygenation) may be required to support lung function. Once the newborn is stabilized, surgical repair is performed by closing the diaphragmatic defect directly or using a synthetic patch.
Acquired Diaphragmatic Hernia
Traumatic hernias are repaired surgically, often using minimally invasive laparoscopic or thoracoscopic techniques. Treatment of hiatal hernia depends on severity:
- Conservative management: Proton pump inhibitors (PPIs), dietary modifications, weight loss, and sleeping with the head elevated.
- Surgical treatment: Fundoplication (wrapping the upper stomach around the lower esophagus) for severe gastroesophageal reflux or large hernias.
Prognosis
Prognosis depends greatly on the type and severity of the hernia. Congenital diaphragmatic hernia carries a significant mortality risk, largely due to associated pulmonary hypoplasia (underdeveloped lungs) and pulmonary hypertension. Despite advances in neonatal care, outcomes remain challenging in severe cases. Acquired hernias generally carry a favorable prognosis following timely surgical repair.
References
- Stege G, Fenton A, Jaffray B. Nihilism in the 1990s: The true mortality of congenital diaphragmatic hernia. Pediatrics. 2003;112(3):532-535.
- Lally KP, Lally PA, Lasky RE, et al. Defect size determines survival in infants with congenital diaphragmatic hernia. Pediatrics. 2007;120(3):e651-e657.
- Shields TW, LoCicero J, Reed CE, Feins RH (eds.). General Thoracic Surgery. 7th ed. Lippincott Williams and Wilkins; 2009.
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