Processing...
`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 |
Heart, Cardiology and Blood Calculators
- Cardiac Stroke Volume: Computes the volume blood pumped in one stroke based on the end diastolic and systolic volumes.
- Cardiac Output: Computes the output of a heart based on the heart rate, end diastolic volume and the end systolic volume.
- Cardiac Output with Stroke Volume: Computes the volume rate of blood pumped by the heart in one minute based on the beats per minute and the stroke volume.
- Ejection Fraction: Computes the Ejection Fraction percentage based on the end-systolic and end-diastolic volumes.
- Heart Stroke Work: Computes the amount of work performed by the heart during a single heartbeat to pump blood based on the Mean Arterial Pressure (MAP) and Stroke Volume(SV).
- Mean Arterial Press: Compute the mean arterial pressure and pulse pressure based on the diastolic pressure and the systolic pressure.
- Cardiac Stroke Work: Computes work done by the ventricle to eject a volume of blood into the aorta based on the afterload pressure, stroke volume, blood stroke mass and blood flow velocity.
- Cardiac Flow (Q): Computes the flow factor of an artery based on the diameter and blood flow velocity.
- Body Surface Area (BSA): Wide range of calculators in one function to compute the body surface area base on one of many common methods (e.g., Mosteller, Takahira)
- Hagen-Poiseuille Resistance: Fluid resistance of blood and plasma based on viscosity, length and radius of vessel.
- Poiseuille's Law: Fluid flow rate from change in pressure, length, diameter and viscosity
- Poiseuille's Velocity of Compressible Fluids: Fluid velocity based on tube radius and length, input and output pressures, and fluid viscosity.
- Heart Chamber Pressure via the Law of Laplace: Pressure on membrane wall based on wall stress, chamber radius and vascular wall thickness.
- Heart Wall Stress via the Law of Laplace: Stress on the membrane wall of based on the blood pressure, radius of the chamber (r) and the vascular wall thickness (T).
- Blood Flow Rate using Darcy's Law: Blood flow through a vessel based on a change in pressure and a resistance factor.
- Change in Vascular Pressure: Change in pressure at two points in a vessel.
- Blood Pressure: Blood pressure based on Cardiac Output and Blood Flow Resistance
- Mean Arterial Pressure (MAP): Calculates MAP from Pulse Pressure and Diastolic Pressure
- Mean Arterial Pressure and Pulse Pressure: Calculates MAP and Pulse Pressure from Diastolic Pressure and Systolic Blood Pressure
- Cardiac Output from Heart Rate and Stroke Volume: Output of a heart based on the heart stroke volume and the heart rate.