Left Atrial Pressure by Mitral Regurgitant Jet
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Calcs>Pressure>LAP by MR Jet>1
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SBP: mmHg
Vmax of MR Jet m/sec
 
LAP: mmHg









 
How to calculate a LAP.
 
Step 1: Obtain a CWD of the long axis view of the mitral valve. A mitral regurgitant jet is required to make this calculation.  Once the flow profile of the CWD of the MR jet is obtained, the maximum velocity (Vmax) will represent the mitral valve gradient.  Subtracting the mitral valve gradient from the systolic blood pressure will yield the LAP.
 
 

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Comment  User3010(3010)    #7
Comment:
It is easy to understand if the MR jet is 5 or 6M/sec. However, let us say if MR jet is 2-3 M/sec, the LAP will be in 80-90s! Please explain.
 
 
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Comment  User3580(3580)    #46
Comment:
Not sure what you mean. So a
 
 
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Comment  Webmaster    #53
Comment:
The MR CWD will give a gradient across the MV during systole. Subtracting the gradient from the systolic BP will give the LAP. If the MR jet is 3 m/s then the gradient is 36 mmHg then substracting the 36 mmHg from the SBP will give the LAP. The LAP will not be 80-90 as mentioned above because the the ventricle has only generated 36 mmHG of pressure. The MR Vmax gives you an indication of the pressure generated by the LV. Normally, the LV would generate a 5-6 m/s jet and the calculations are easy to understand. If the LV is failing the the SBP is 80 mmHg and it generates a gradient of 64 mmHg from teh MR jet then the LAP is 16.
 
 
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Comment  User3643(3643)    #64
Comment:
If the MR jet is 3 m/s then the gradient from the LV to the LA is 36 mmHg.
 
 
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Comment  User3643(3643)    #65
Comment:
If the MR jet is 3 m/s then the gradient from the LV to the LA is 36 mmHg.
 
 
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Comment  User3643(3643)    #66
Comment:
If the MR jet is 3m/s then the gradient would be 36 mmHg. If the systolic BP was 120 mmHg,
 
 
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Comment  User3736(3736)    #76
Comment:
Test Msg.
 
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