Left Atrial Pressure by Mitral Regurgitant Jet · ·
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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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 Re: Rating:
 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.

 Re: Rating:
 User3580(3580) #46
 Comment: Not sure what you mean. So a

 Re: Rating:
 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.

 Re: Also confused! Rating:
 User3643(3643) #64
 Comment: If the MR jet is 3 m/s then the gradient from the LV to the LA is 36 mmHg.

 Re: Also confused! Rating:
 User3643(3643) #65
 Comment: If the MR jet is 3 m/s then the gradient from the LV to the LA is 36 mmHg.

 Re: Rating:
 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,

 Re: Test Msg Rating:
 User3736(3736) #76
 Comment: Test Msg.