Which multiplicative factor is used in the graft flow volume equation to convert to per-minute units?

Which multiplicative factor is used in the graft flow volume equation to convert to per-minute units?

• A. 1
• B. 60
• C. 30
• D. 120

Answer: (B)

The main idea is converting flow rate from per second to per minute in the graft flow volume calculation. In practice, you multiply velocity by cross-sectional area to get volume flow per second, then multiply by 60 to convert to per-minute units, since there are 60 seconds in a minute. The standard form is Q = Vmean × A × 60, which yields flow in mL/min (since 1 cm^3 = 1 mL). Using 1 would give per-second flow, while 30 or 120 would incorrectly assume 30 seconds or 120 seconds per minute, respectively.

The main idea is converting flow rate from per second to per minute in the graft flow volume calculation. In practice, you multiply velocity by cross-sectional area to get volume flow per second, then multiply by 60 to convert to per-minute units, since there are 60 seconds in a minute. The standard form is Q = Vmean × A × 60, which yields flow in mL/min (since 1 cm^3 = 1 mL). Using 1 would give per-second flow, while 30 or 120 would incorrectly assume 30 seconds or 120 seconds per minute, respectively.