Normal stroke volume per beat is approximately which of the following?

Normal stroke volume per beat is approximately which of the following?

• A. 20-40 mL/beat
• B. 150-200 mL/beat
• C. 60-130 mL/beat
• D. 80-160 mL/beat

Answer: (C)

Stroke volume is the amount of blood ejected from the left ventricle with each heartbeat. In a healthy adult at rest, it typically falls in the range of about 60 to 130 mL per beat. This range captures the normal variability between individuals, so it is considered the standard resting SV. Values much lower (around 20–40 mL/beat) suggest reduced preload or impaired contractility, while values well above (like 150–200 mL/beat) are not typical at rest and would point to unusual physiological states. The broader range you see here acknowledges that normal can vary, and 60–130 mL per beat best represents typical resting stroke volume. Remember, stroke volume is influenced by preload, afterload, and contractility, and cardiac output at rest is approximately 4–8 L/min when you multiply SV by heart rate.

Stroke volume is the amount of blood ejected from the left ventricle with each heartbeat. In a healthy adult at rest, it typically falls in the range of about 60 to 130 mL per beat. This range captures the normal variability between individuals, so it is considered the standard resting SV. Values much lower (around 20–40 mL/beat) suggest reduced preload or impaired contractility, while values well above (like 150–200 mL/beat) are not typical at rest and would point to unusual physiological states. The broader range you see here acknowledges that normal can vary, and 60–130 mL per beat best represents typical resting stroke volume. Remember, stroke volume is influenced by preload, afterload, and contractility, and cardiac output at rest is approximately 4–8 L/min when you multiply SV by heart rate.