What is the recommended oxygen flow rate in the described protocol for possible MI?

• A. 8 Lpm
• B. 4 Lpm
• C. 2 Lpm
• D. 6 Lpm

Answer: (A)

The main idea is to rapidly maximize oxygen delivery to the heart when an MI is possible. In this protocol, a higher flow of oxygen—8 liters per minute—is used to provide a high inspired oxygen concentration quickly, typically with a high FiO2 delivery device such as a non-rebreather mask. This helps ensure the patient’s blood is well-oxygenated during ischemia, reducing the risk of further myocardial injury.

Lower flows (4, 2, or 6 L/min) deliver less oxygen and may be insufficient if the patient is hypoxemic or under increased oxygen demand from ischemia. While current practice emphasizes titrating oxygen to maintain adequate saturation rather than always giving high-flow oxygen, this specific protocol designates 8 L/min as the recommended rate for a possible MI to secure prompt and ample oxygenation.