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Introduction: OSCAR - Open Source CPAP Analysis Reporter The analysis of the respiratory waveform is the heart and strength of OSCAR, whether it is reporting the results from the manufacturer or Manually interpreting the displayed respiratory waveform, it is the core.

 1 OSCAR Installation and Data Migration Guide

A discussion of downloading and installing OSCAR on your PC followed by a discussion of migrating data from a previous version or from SleepyHead.

2  Running OSCAR for the first time

A discussion of Creating a Profile (required) and importing data from your CPAPs SD Card.

 3 Basic OSCAR Organization
      3.1 Basic Parts of the OSCAR Window in All Views
          3.1.1 The View menu
          3.1.2 The Data menu
      3.2 Parts of the Daily data window
          3.2.1 The Calendar
          3.2.2 The Left Sidebar
          3.2.3 The daily detailed graphs
4 OSCAR Basic data interpretation: Daily Detailed Data
      4.1 Left Side Bar data---AHI and event data table

AHI The Apnea–Hypopnea Index (AHI) is an index used to indicate the severity of sleep apnea. It is represented by the number of apnea and hypopnea events per hour of sleep. The apneas (pauses in breathing) must last for at least 10 seconds and are associated with a decrease in blood oxygenation. Combining AHI and oxygen desaturation gives an overall sleep apnea severity score that evaluates both number sleep disruptions and degree of oxygen desaturation (low blood level). The AHI is calculated by dividing the number of apnea events by the number of hours of sleep. With AHI, a lower number is better; any number under 5.0 is ideal. Your AHI number displayed in DreamMapper will fluctuate and change every day based on your breathing the night before. The AHI number displayed in DreamMapper will fluctuate and change every day based on your breathing the night before. Your goal is to obtain an AHI as close to 0.0 as possible. Any number under 5.0 is ideal

Unclassified Apnea

Obstructive An apnea is detected when there is an 80% reduction in airflow from a baseline for at least 10 seconds if there is no airflow detected for 10 seconds. During the apnea, one or more pressure test pulses are delivered by the device. The device evaluates the response of the patient to the test pulse(s) and assesses whether the apnea has occurred while the patient has a clear airway or an obstructed airway. The airway is determined to be clear if the pressure test pulse generates a significant amount of flow; otherwise the airway is determined to be obstructed. When the airway is obstructed then an Obstructed Airway Apnea event is recorded.

What is a Hypopnea? An episode of overly shallow breathing or an abnormally low respiratory rate. Our auto algorithm establishes a baseline of patient flow based on a moving flow signal window. When your device detects a hypopnea as a 40% reduction in flow lasting at least 10 seconds, followed by a recovery breath, then a Hypopnea event is recorded.

      4.2 Left Sidebar Data---Statistical Data chart
          4.2.1 Statistical Leak Data
      4.3 Important Daily Detailed Graphs
          4.3.1 The Events Table

What is an Apnea? An apnea is a pause in breathing, lasting 10 or more seconds.

Clear Airway or Central Apnea? An apnea is detected when there is an 80% reduction in airflow from a baseline for at least 10 seconds if there is no airflow detected for 10 seconds. During the apnea, one or more pressure test pulses are delivered (PR) by the device. The device evaluates the response of the patient to the test pulse(s) and assesses whether the apnea has occurred while the patient has a clear airway or an obstructed airway. The airway is determined to be clear if the pressure test pulse generates a significant amount of flow; otherwise the airway is determined to be obstructed. When the airway is clear then a Clear Airway Apnea event is recorded.

Event Definition Apnea, Hypopnea, Flow Limitation Apnea: 80% to 100% reduction in airflow for >= 10 seconds Hypopnea: 50% to 80% reduction in airflow for >= 10 seconds Flow Limitation: <50% reduction in airflow for >= 10 seconds

Large Leak Philips CPAPs tolerate up to twice the intentional leaks. They compensate for this leak by adjusting the speed of the blower. Beyond the tolerance threshold, the DreamStation indicates that its detection is not reliable in terms of the increased level of non-intentional leaks. It then qualifies these leaks as large

          4.3.2 The Flow Rate graph
          4.3.3 The Pressure graph
          4.3.4 The Leak Rate graph
          4.3.5 The Snore graph
          4.3.6 The Flow Limitation Graph
          4.3.7 ALL OTHER GRAPHS
      4.4 Advanced OSCAR graphs
      4.5 The Flow Rate graph---a detailed look
          4.5.1 Inspiration Expiration Ratio (I:E Ratio)
          4.5.2 Robysue's Flow Rate Interpretation from Forum Posts
      4.6 The Pressure graph---a detailed look
          4.6.1 Common concerns that people have about their Pressure graph
      4.7 Leak Rate Graph---a detailed look

          4.7.1 Defining Large Leaks
          4.7.2 Part II: Are my leaks bad enough to worry about?
              4.7.2.1 Great, Good, and Decent Enough Leak/Total Leak lines
              4.7.2.2 Problematic Leak/Total Leak Lines
              4.7.2.3 Bad and Horrible Leak/Total Leak Lines
      4.8 The AHI Graph
5 OSCAR Overview Data [b]Basic data interpretation
      5.1 Overview data
      5.2 The AHI graph
      5.3 The Usage Compliance Overview
      5.4 Session Times Overview
      5.5 Leaks and Total Leak Overview
      5.6 Peak Hourly AHI Overview
 6  OSCAR Statistics Data [b]Basic data interpretation
      6.1 Organization of the Statistics Page
      6.2 A detailed look at the CPAP Statistics
          6.2.1 CPAP Usage data
          6.2.2 Therapy Efficacy data
          6.2.3 Leak Statistics
          6.2.4 Pressure Statistics
          6.2.5 Bugs in the CPAP Statistics data
7  OSCAR Important preferences settings
      7.1 The Import panel
      7.2 The CPAP panel
          7.2.1 CPAP clock drift
          7.2.2 Show Leak Redline
          7.2.3 A detailed look at the Show Leak Redline option
      7.3 The Graphs panel
      7.4 The General panel
      7.5 The Appearance panel
8  OSCAR Leaks
      8.1 Difference between Total Leak Rate and Leak Rate
      8.2 Definition of Large Leak
      8.3 Perfect Leak/Total Lines
      8.4 Good and Decent Enough Leak/Total Leak lines
      8.5 Problematic, Bad, and Horrible Leak Lines
      8.6 Mouth Breathing and Other Causes of Leaks
      8.7 Annoying Leaks
      8.8 Why are Large Leaks an Issue?

Philips CPAPs tolerate up to twice the intentional leaks. They compensate for this leak by adjusting the speed of the blower. Beyond the tolerance threshold, the DreamStation indicates that its detection is not reliable in terms of the increased level of non-intentional leaks. It then qualifies these leaks as large.

9  OSCAR Beyond AHI: Apneas and Hypopneas in the Flow Rate graph
10 OSCAR Snoring Data
11 OSCAR Flow Limitations
      11.1 OSCAR Flow Limitation
      11.2 Examples of respiratory wave form abnormalities including Flow Limitation
      11.3 OSCAR Flow Limitation Example (Resmed)

12 OSCAR supported machines

A list of machines that are supported by OSCAR

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