Doppler Echo Cardiac Output Calculator
Non-invasive cardiac output assessment using echocardiography
Patient Parameters
Required for body surface area calculation
Required for body surface area calculation
Normal range: 60-100 bpm
Normal range: >18 cm (stroke distance)
Normal range: 18-22 mm (left ventricular outflow tract)
Doppler Echo Results
Within normal physiological range
Below normal range - may indicate compromised cardiac function
Calculated Parameters
Calculation Steps
Step 1: Body Surface Area (BSA)
BSA = √((Height × Weight) / 3600)
Using Mosteller formula for body surface area calculation
Step 2: Cross-Sectional Area (CSA)
CSA = π × (LVOT diameter/2)²
Area of circular LVOT cross-section
Step 3: Stroke Volume (SV)
SV = CSA × LVOT VTI
Volume of blood ejected per heartbeat
Step 4: Cardiac Output (CO)
CO = (SV × Heart Rate) / 1000
Total blood volume pumped per minute
Step 5: Cardiac Index (CI)
CI = CO / BSA
Cardiac output normalized to body size
Normal Physiological Values
Key Concepts
LVOT
Left ventricular outflow tract - cylindrical region leading to aorta
VTI
Velocity time integral - stroke distance of blood flow
Doppler Echo
Non-invasive ultrasound method for measuring blood flow
Cardiac Index
Cardiac output normalized to body surface area
Clinical Applications
Heart failure assessment and monitoring
Hemodynamic evaluation in ICU patients
Research and clinical trials
Non-invasive alternative to Swan-Ganz catheter
Medical Disclaimer
This calculator is for educational purposes only and should not replace professional medical advice. Doppler echocardiography requires proper training and expertise for accurate measurements. Clinical interpretation should always be performed by qualified healthcare professionals. The calculated values should be considered alongside other clinical findings and patient history. Always consult with a cardiologist or trained echocardiographer for proper assessment and interpretation.
Understanding Doppler Echo Cardiac Output
What is Doppler Echocardiography?
Doppler echocardiography is a non-invasive ultrasound technique that uses the Doppler effect to measure blood flow velocity and calculate cardiac output. It provides real-time assessment of heart function without the need for invasive procedures.
Key Measurements
- •LVOT Diameter: Measured in parasternal long-axis view
- •LVOT VTI: Measured using pulsed-wave Doppler
- •Heart Rate: From ECG or echo monitor
- •Patient Anthropometrics: For BSA calculation
Clinical Significance
Cardiac Output (CO)
Total volume of blood pumped by the heart per minute. Reflects overall cardiac performance.
Cardiac Index (CI)
Cardiac output normalized to body size. Better for comparing between patients of different sizes.
Stroke Volume (SV)
Volume of blood ejected with each heartbeat. Reflects ventricular function.
Advantages of Doppler Echo Method
Benefits
- • Non-invasive and safe procedure
- • Real-time assessment capability
- • No radiation exposure
- • Repeatable measurements
- • Cost-effective compared to invasive methods
- • Portable equipment available
Limitations
- • Operator-dependent accuracy
- • May be affected by poor acoustic windows
- • Assumes circular LVOT geometry
- • Requires proper Doppler alignment
- • May underestimate in some conditions
- • Training required for accurate measurements
Clinical Applications
Heart Failure
Monitor cardiac function and response to therapy
Critical Care
Hemodynamic assessment in ICU patients
Research
Clinical trials and cardiovascular studies