Which sign is a late sign of hypoxemia?

Which sign is a late sign of hypoxemia?

• A. Tachycardia
• B. Anxiety
• C. Cyanosis
• D. Tachypnea

Answer: (C)

Cyanosis appears late because visible blue coloring only shows up after a substantial amount of hemoglobin in the blood is deoxygenated. Early responses to hypoxemia—like the heart beating faster, breathing faster, and a sense of anxiety or restlessness—occur as the body tries to compensate for low oxygen. It’s only when oxygenation falls quite low and deoxygenated hemoglobin reaches a high enough level that the lips, nails, and mucous membranes take on a blue tint. Because cyanosis can be hard to detect in people with dark skin or under poor lighting, the absence of cyanosis doesn’t rule out hypoxemia; other signs of oxygen deficit should be prioritized for timely intervention.

Cyanosis appears late because visible blue coloring only shows up after a substantial amount of hemoglobin in the blood is deoxygenated. Early responses to hypoxemia—like the heart beating faster, breathing faster, and a sense of anxiety or restlessness—occur as the body tries to compensate for low oxygen. It’s only when oxygenation falls quite low and deoxygenated hemoglobin reaches a high enough level that the lips, nails, and mucous membranes take on a blue tint. Because cyanosis can be hard to detect in people with dark skin or under poor lighting, the absence of cyanosis doesn’t rule out hypoxemia; other signs of oxygen deficit should be prioritized for timely intervention.