What does AHI stand for in sleep medicine?

AHI stands for Apnea-Hypopnea Index, and it is a critical metric used in sleep medicine to quantify the severity of sleep apnea. The AHI is calculated by taking the total number of apneas (complete cessation of airflow for at least ten seconds) and hypopneas (partial cessation of airflow accompanied by a decrease in oxygen saturation or arousal) that occur during a sleep study and dividing that number by the total hours of sleep.

This index is essential for diagnosing sleep apnea and deciding on the appropriate treatment options. It helps healthcare providers assess the impact of sleep disordered breathing on an individual's overall health, enabling tailored interventions to improve sleep quality and reduce associated risks, such as cardiovascular issues, daytime fatigue, and other comorbidities.

The other options do not accurately reflect the terminology commonly used in sleep medicine, which is why they do not fit. Understanding the correct definition of AHI is fundamental for professionals in the field and aids in effective communication and treatment planning for patients experiencing sleep-related issues.