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`Q = pi * (d/2)^2 * v`
185.354
The Cardiac Flow calculator computes the flow factor of an artery based on the diameter and blood flow velocity. .
INSTRUCTIONS: Choose units and enter the following:
- (d) Artery Diameter
- (v) Blood Velocity Magnitude
Cardiac Flow (Q): The flow is returned in milliliters per second (mL/s). However, these can be automatically converted to compatible units via the pull-down menu.
The Math / Science
The Cardiac Flow calculator computes the flow factor of an artery based on the diameter and blood flow velocity. The formula for Cardiac Flow is:
`Q = a * v`
with, `a = pi * (d/2)^2`
where:
- Q = Cardiac Flow
- a = arterial area
- d = artery diameter
- v = blood velocity magnitude
Blood Velocity Magnitude
According to a National Institute of Health report, the following information can be considered for velocity magnitude based on age ranges and gender.
| Age Group | Gender | ||||||
|---|---|---|---|---|---|---|---|
| Parameters | 9-15 years | 16-20 years | 21-39 years | 40-59 years | > 60 years | Men | Women |
| Aortic Valve Peak Velocity (m/s) | 1.32 | 1.27 | 1.07 | 1.28 | 1.42 | 1.28 | 1.18 |
| Mean Velocity (m/s) | 0.74 | 0.75 | 0.68 | 0.61 | 0.52 | 0.64 | 0.67 |
| Median Velocity (m/s) | 0.75 | 0.76 | 0.68 | 0.59 | 0.49 | 0.63 | 0.67 |