1. What is the Apnea Hypopnea Index?

The Apnea Hypopnea Index (AHI) is a measure of sleep apnea severity that represents the average number of apneas and hypopneas per hour of sleep. It is the primary metric used to diagnose and classify the severity of obstructive sleep apnea.

2. How Does the Calculator Work?

The calculator uses the AHI formula:

Where:

• \( Apneas \) — Total number of apnea events during sleep
• \( Hypopneas \) — Total number of hypopnea events during sleep
• \( Sleep\ Hours \) — Total hours of sleep recorded

Explanation: The equation calculates the average number of breathing disruptions per hour of sleep, which helps classify sleep apnea severity.

3. Importance of AHI Calculation

Details: AHI is crucial for diagnosing sleep apnea severity, determining appropriate treatment options, and monitoring treatment effectiveness over time. It helps classify sleep apnea as mild, moderate, or severe.

4. Using the Calculator

Tips: Enter the total number of apnea events, hypopnea events, and total sleep hours from a sleep study. All values must be valid (events ≥ 0, sleep hours > 0).

5. Frequently Asked Questions (FAQ)

Q1: What is the difference between apneas and hypopneas?
A: Apneas are complete pauses in breathing lasting at least 10 seconds. Hypopneas are partial reductions in breathing with associated oxygen desaturation or arousal.

Q2: How is sleep apnea severity classified?
A: Mild: AHI 5-15 events/hour; Moderate: AHI 15-30 events/hour; Severe: AHI >30 events/hour.

Q3: What is a normal AHI value?
A: An AHI less than 5 events per hour is generally considered normal for adults.

Q4: Can AHI vary from night to night?
A: Yes, AHI can fluctuate based on sleep position, alcohol consumption, medication use, and other factors.

Q5: Is AHI the only measure used to diagnose sleep apnea?
A: While AHI is the primary metric, clinicians also consider oxygen desaturation levels, symptoms, and other factors when diagnosing and treating sleep apnea.