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Cardiac Flow

Last modified by
on
Mar 24, 2025, 12:59:11 PM
Created by
on
Feb 7, 2024, 4:58:34 PM
Q=π⋅(d2)2⋅v
(d)Arterial Diameter
(v)Blood Velocity Magnitude
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Medicine Physiology Heart blood Cardiology
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2138ee41-c5da-11ee-9b96-bc764e203090

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=π⋅(d2)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.

Velocity Magnitude Distribution
  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 and Cardiology 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)
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