Which statement correctly defines the normal range for Stroke Index (SV index) in clinical practice?

Which statement correctly defines the normal range for Stroke Index (SV index) in clinical practice?

• A. 25 to 60 mL/min/m²
• B. 30 to 65 mL/min/m²
• C. 60 to 120 mL/min/m²
• D. 5 to 20 mL/min/m²

Answer: (B)

Stroke index represents how much blood is ejected with each heartbeat when you account for body size. It shows cardiac performance per beat, not per minute, and is indexed to body surface area so you can compare across patients. The normal range is about 30 to 65 mL per beat per square meter. This numeric span is what clinicians expect for a healthy heart relative to body size, making it the best match among the options. Values below this range imply reduced stroke volume due to factors like preload deficit or impaired contractility, while values above are less typical and usually require further context to interpret.

Stroke index represents how much blood is ejected with each heartbeat when you account for body size. It shows cardiac performance per beat, not per minute, and is indexed to body surface area so you can compare across patients.

The normal range is about 30 to 65 mL per beat per square meter. This numeric span is what clinicians expect for a healthy heart relative to body size, making it the best match among the options. Values below this range imply reduced stroke volume due to factors like preload deficit or impaired contractility, while values above are less typical and usually require further context to interpret.