# Left Atrial Systolic Pressure by Mitral Regurgitation Jet

#### Reference Value

 Left atrial systolic pressure3 Normal 6 – 21 mmHg

#### Formula

$Left \hspace{0.1cm}atrial \hspace{0.1cm}systolic \hspace{0.1cm}pressure = SBP – 4 (peak\hspace{0.1cm}V_{MR})^2$

#### Definitions

 VMR Mitral regurgitation velocity (m/sec) SBP Systolic Blood Pressure (mmHg)

#### References

 1 Gorcscan J, et al. Noninvasive estimation of left atrial pressure in patients with congestive heart failure and mitral regurgitation by Doppler echocardiography. Am Heart J., 121:858, 1991. Abstract 2 Nishimura RA, et al. Determination of left-sided pressure gradients by utilizing Doppler aortic and mitral regurgitant signals: validation by simultaneous dual catheter and Doppler studies. JACC 11:317, 1988. Full text 3 Braunwald E, et al. Left Atrial and Left Ventricular Pressures in Subjects without Cardiovascular Disease. Observations in Eighteen Patients Studied by Transseptal Left Heart Catheterization. Circulation, Volume XX1V, August 1961. Full text

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Developer & Illustrator: Sirikarn Napan, MD, FACC