Sleep Apnea and GERD
Obstructive sleep apnea (OSA) is a common sleep disorder that occurs when the muscles in the throat relax during sleep, causing the airway to collapse and breathing to repeatedly stop and start. Patients with OSA often wake from deep sleep choking or gasping for air. As a result, sleep quality deteriorates, leading to excessive daytime sleepiness, fatigue, and reduced overall quality of life. Common risk factors include obesity, advancing age, and enlarged tonsils.
Gastroesophageal reflux disease (GERD), also known as acid reflux, is not always recognized as a major contributor to sleep apnea. However, growing evidence shows that GERD and obstructive sleep apnea have a bidirectional relationship—meaning each condition can worsen the other. This connection exists even when common shared risk factors such as obesity and age are taken into account.
Evidence Linking GERD and Sleep Apnea
Research increasingly supports the relationship between GERD and OSA. Genetic studies have demonstrated that individuals with a genetic susceptibility to GERD have a higher risk of developing sleep apnea, and vice versa. Additionally, nocturnal reflux symptoms occur approximately twice as often in patients with OSA compared to the general population. Studies also show that nighttime acid reflux becomes more severe as sleep apnea worsens.
Treatment of sleep apnea with continuous positive airway pressure (CPAP) has been shown to significantly reduce nighttime reflux episodes and associated symptoms.
How Sleep Apnea Contributes to GERD
From a physiological perspective, obstructive sleep apnea generates negative pressure in the chest during attempts to breathe against a blocked airway. This negative pressure encourages stomach contents to reflux into the esophagus. Over time, these repetitive pressure changes can weaken the gastroesophageal junction, the natural barrier that normally prevents reflux.
Chronic strain on the hiatus (the opening in the breathing muscle through which the esophagus goes through) may also contribute to the development of a hiatal hernia, a condition in which the top part of the stomach protrudes through into chest. When a hiatal hernia is present, reflux symptoms can worsen significantly because stomach contents are more easily exposed to negative chest pressure during apnea episodes.
How GERD May Worsen Sleep Apnea
The mechanisms by which GERD exacerbates sleep apnea are less clearly understood. One proposed explanation is that acid reflux reaching the upper airway can lead to inflammation and irritation of the airway tissues. This inflammation may narrow the airway and increase the likelihood of obstruction during sleep, triggering apnea episodes.
Treating GERD and Sleep Apnea Together
For patients who suffer from both GERD and obstructive sleep apnea, addressing both conditions simultaneously is important to achieve optimal symptom control.
A common clinical scenario involves patients with morbid obesity who also have GERD and OSA. In such cases, a combined surgical approach may be recommended, including hiatal hernia repair and a weight loss procedure like gastric bypass or sleeve gastrectomy. Weight loss achieved through sleeve gastrectomy can significantly improve both GERD and sleep apnea, while repairing the hiatal hernia helps restore the natural barrier against reflux. The reliability of Nissen fundoplication to restore the anti-reflux barrier decreases with obesity. Replacing it with a weight loss procedure to treat the underlying cause of both GERD and OSA improves sleep quality, reduces reflux symptoms, and insures better long-term health outcomes.
References
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