Which arterial blood gas value indicates whether oxygenation is adequate?

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Prepare for the Pediatric Cardiac Arrest Test using flashcards and multiple choice questions. Each question is accompanied by helpful hints and detailed explanations to ensure you're ready for the exam!

Multiple Choice

Which arterial blood gas value indicates whether oxygenation is adequate?

Explanation:
Oxygenation is reflected by the arterial oxygen tension, PaO2. This value shows how much oxygen is dissolved in arterial blood and, together with oxygen saturation, indicates how well oxygen is moving from the lungs into the blood. A normal or appropriately elevated PaO2 with supplemental oxygen means oxygenation is adequate. The other values measure different things: pH tells you whether the blood is acidic or alkaline (acid-base status), PaCO2 reflects how effectively the lungs are removing carbon dioxide (ventilation), and bicarbonate (HCO3) indicates metabolic buffering or compensation. These tell you about ventilation and acid-base balance, not directly how well oxygen is being delivered to tissues.

Oxygenation is reflected by the arterial oxygen tension, PaO2. This value shows how much oxygen is dissolved in arterial blood and, together with oxygen saturation, indicates how well oxygen is moving from the lungs into the blood. A normal or appropriately elevated PaO2 with supplemental oxygen means oxygenation is adequate.

The other values measure different things: pH tells you whether the blood is acidic or alkaline (acid-base status), PaCO2 reflects how effectively the lungs are removing carbon dioxide (ventilation), and bicarbonate (HCO3) indicates metabolic buffering or compensation. These tell you about ventilation and acid-base balance, not directly how well oxygen is being delivered to tissues.

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