Certified Neuroscience Registered Nurse (CNRN) Practice Exam

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Prepare for the CNRN Exam. Test your knowledge with our comprehensive multiple-choice questions and detailed explanations. Boost your confidence and improve your chances of a successful exam outcome!

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What is the normal pressure range for the lower esophageal sphincter (LES)?

10 torr
20 torr
30 torr
40 torr

The correct answer is: 30 torr

The normal pressure range for the lower esophageal sphincter (LES) is typically around 30 torr. This pressure is crucial for maintaining the competence of the LES, which prevents the reflux of gastric contents into the esophagus. A pressure that is too low may lead to gastroesophageal reflux disease (GERD), as the sphincter may not close properly, allowing acid and other stomach contents to flow back into the esophagus. Conversely, significantly high pressures may indicate conditions such as achalasia or other motility disorders. Maintaining this optimal pressure range is vital for proper digestive function and to prevent complications related to reflux and esophageal irritation. Understanding this normal range helps healthcare professionals assess esophageal function and potential pathologies associated with dysphagia or reflux symptoms.