What is a primary reason to use 100% oxygen during cardiac arrest?

What is a primary reason to use 100% oxygen during cardiac arrest?

• A. To maximize oxygen delivery during resuscitation
• B. To reduce oxygen toxicity
• C. To limit oxygen usage
• D. To keep room air constant

Answer: (A)

During cardiac arrest, tissues aren’t getting enough blood flow, so they quickly become hypoxic. The main reason to use 100% oxygen during resuscitation is to maximize the amount of oxygen that can be carried in the blood and delivered to organs once circulation is restored through CPR. By providing a full oxygen fraction, alveolar oxygen tension rises, increasing the oxygen content of arterial blood (including dissolved oxygen), which helps supply tissues during the period of low or intermittent blood flow. After return of spontaneous circulation, oxygen should be titrated to avoid unnecessary exposure and maintain safe saturations. The other ideas don’t fit the urgent goal: while oxygen toxicity is a consideration, it’s not the primary priority during arrest; limiting oxygen use or keeping room air constant would reduce oxygen delivery when it’s most needed.

During cardiac arrest, tissues aren’t getting enough blood flow, so they quickly become hypoxic. The main reason to use 100% oxygen during resuscitation is to maximize the amount of oxygen that can be carried in the blood and delivered to organs once circulation is restored through CPR. By providing a full oxygen fraction, alveolar oxygen tension rises, increasing the oxygen content of arterial blood (including dissolved oxygen), which helps supply tissues during the period of low or intermittent blood flow. After return of spontaneous circulation, oxygen should be titrated to avoid unnecessary exposure and maintain safe saturations.

The other ideas don’t fit the urgent goal: while oxygen toxicity is a consideration, it’s not the primary priority during arrest; limiting oxygen use or keeping room air constant would reduce oxygen delivery when it’s most needed.