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A/a Gradient APK

The description of A/a Gradient

The variables in this App. are :
RQ :Respiratory Quotient (approx 0.8 at normal physiological state)
PB : Atmospheric pressure.(760 mm Hg at sea level.)
FiO2 : Fraction of Inspired Oxygen. (0.21 at room air.)
PAO2 : Alveolar Oxygen tension
PaO2 : Arterial oxygen tension

These can be independently changed and the reflection of these changes can be seen in the alveolar – arteriolar gradient and PaO2 / FiO2 ratio.

A-a oxygen gradient : The alveolar arterial (A–a) oxygen gradient is a measure of oxygen transfer across alveolar capillary membrane (“A” denotes alveolar and “a” denotes arterial oxygenation). It is the difference between the alveolar and arterial oxygen tension.
A-a oxygen gradient = PAO2 - PaO2.
PaO2 is derived from ABG while PAO2 is calculated.
PAO2 = (FiO2 x [PB - PH2O]) - (PaCO2 ÷ RQ)
[PH2O is the partial pressure of water (47 mm Hg)] & PaCO2 is partial pressure of Carbon di oxide in arterial blood.
A-a gradient varies with age and can be estimated from the following equation, assuming the patient is breathing room air.
A-a gradient = 2.5 + 0.21 x age in years.
A-a gradient increases with higher FiO2.

PaO2/FiO2 ratio : It is a measure of Oxygen transfer across the alveolar capillary membrane. Normal PaO2/FiO2 ratio is 300 to 500 mmHg. Values less than 300 mmHg indicating impaired gas exchange and values less than 200 mmHg indicates severe hypoxemia.

"Alveolar arterial membrane is depicted in this App. as a BLACK LINE (This is purely a conceptual representation of ventilation-perfusion relationship).The thickness of this Black Line is shown to vary depending on the variations in A-a gradient"
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What's new

2016-03-04
Bug fixes and enhancements
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A/a Gradient APK Version History
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A/a Gradient 1.6 for Android 3.0+ APK Download

Version: 1.6 (7) for Android 3.0+ (Honeycomb, API 11)

Update on: 2016-03-04

Signature: aa86daffb0b9f305691e8db68765b2a25f92cdc6 A/a Gradient 1.6(7) apk safe verified

APK File SHA1: fb3000663e78cb2f4e7976e4cdae3167ad73c968

What's new: Bug fixes and enhancements

Download APK(5.8 MB)

A/a Gradient 1.5 for Android 3.0+ APK Download

Version: 1.5 (6) for Android 3.0+ (Honeycomb, API 11)

Update on: 2015-10-11

Signature: aa86daffb0b9f305691e8db68765b2a25f92cdc6 A/a Gradient 1.5(6) apk safe verified

APK File SHA1: db926092568b6c41dac465167f94f34394dd509e

What's new: Changed the Info page.

Download APK(5.8 MB)

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