Apnea Calculator

About Apnea

A mean AHI in CPAP therapy is more realistic than using arbitrary compliance rates, which in fact hide insufficient reductions in AHI.

Introduction Calculators

Using mathematical function formulas, the effect on the AHI of various treatment modalities can be calculated.

Calculators

To make Apnea formulas more accessible for clinical practice, we developed the online Apnea Calculators.

Disclaimer

This website contains general information about medical conditions and treatments. The information is not advice, and should not be treated as such.

Calculators

 

1. CALCULATOR: CPAP use efficacy

While using CPAP ideally, the AHI is reduced to 0, 1, 2, 3, 4, or 5. While not using CPAP, we assume the AHI remains status quo.The average AHI per night can be calculated using this calculator.

Parameters

DI without treatment AHI without treatment Total Sleep Time
per hour per hour hours

AI whilst using CPAP DI whilst using CPAP AHI whilst using CPAP Hours of CPAP use
per hour per hour per hour hours

Results
Please fill in all parameters

per hour
per hour
per hour

per hour
%
per hour
%
per hour
%
%
hours
%
hours

 

2. &. 3. CALCULATOR: Percentage total sleep time, CPAP must be used to reduce the AHI below 5 OR 10

To be cured of OSAS , the mean AHI must be < 5. What is the minimum percentage of TST during which CPAP must be used to reduce the AHI to < 5?

To "cure" OSA , the AHI should be reduced to below 5, but even with CPAP this seems to be an idealistic goal. Nightly percentage use rises as one reduces the target to below 5. Is an AHI below 10 a more feasible target?

Parameters

AHI whilst using CPAP (Average) TST
per hour hours

(Average) Hours of CPAP use AHI without treatment
hours per hour

Results
Please fill in all parameters

per hour

AHI
%
%
hours
%
hours

 

4. CALCULATOR: Percentage of total sleep time CPAP must be used to reduce the AHI by a certain percentage.

Examining CPAP from another angle, what is the minimum percentage of TST during which CPAP must be used to reduce the initial AHI by a certain percentage (%reduction)

Parameters

AI whilst using CPAP DI whilst using CPAP AHI whilst using CPAP (Average) TST (Average) Hours of CPAP use
per hour per hour per hour hours hours
AI without treatment DI without treatment AHI without treatment AHI reduction
per hour %

Results
Please fill in all parameters

per hour

%
hours
%
hours
%
hours
%
%
%
%

 

5. POSA CALCULATOR

Parameters

AHI without treatment AHI in supine position % total sleep time in supine position
per hour per hour %
NB if the supine position is not the worst position please fill in parameters of worst position

Results
Please fill in all parameters

per hour
NB Positional OSA defined as supine AHI > 2x non-supine AHI (Oksenberg, 1997)

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