When the throat's rhythmic squeeze fails, food begins to back up
In short: Imagine a muscular tube designed to move food toward your stomach suddenly losing its rhythm. In achalasia, a rare disorder, the esophagus fails to contract and the valve at the bottom refuses to open, causing food to become trapped and eventually return upward.
At the cellular level, achalasia is driven by the progressive destruction of ganglion cells within the myostructural myenteric plexus of the esophageal wall. This neurological breakdown disrupts the essential mechanics of swallowing: the muscles of the esophagus lose their ability to perform peristalsis, and the lower esophageal sphincter fails to relax. Consequently, the distal esophagus may undergo dilation as food and liquid accumulate.
While the exact cause remains unknown, researchers have investigated several triggers. Some cases may be linked to viral infections, while others might stem from autoimmune responses where the immune system attacks healthy tissue. In rare instances, a faulty gene may be responsible. While the condition can manifest at any age, it is most frequently diagnosed in individuals between 25 and 60 years old.
The symptoms often develop gradually over several years, making the connection to esophageal dysfunction difficult to recognize. Patients frequently experience dysphagia (difficulty swallowing), regurgitation of undigested food, heartburn, and significant weight loss. Other signs include hiccups, chest pain, and even choking or coughing fits. Because long-term achalasia is linked to a small increased risk of esophageal cancer, clinical investigation is vital.
Diagnosis typically involves manometry to measure muscle pressure, a barium swallow to track liquid movement via X-ray, or an endoscopy to visually inspect the esophageal lining. While there is no cure, treatments aim to relieve symptoms. This can include medications like nitrates or nifedipine to temporarily relax muscles, or mechanical interventions such as balloon dilation to stretch the esophageal muscle.
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Sources
- Summary by Intellect · source: Achalasia (esophageal) - signs and symptoms, pathophysiology, investigations and treatment
- Also: Achalasia
- Also: www.mayoclinic.org — Achalasia - Symptoms and causes
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