In imaging, which prolapse pattern is most commonly associated with a centrally directed MR jet?

In imaging, which prolapse pattern is most commonly associated with a centrally directed MR jet?

• A. Anterior leaflet prolapse
• B. Posterior leaflet prolapse
• C. Normal valve without prolapse
• D. Both leaflets prolapse

Answer: (D)

Jet direction on color Doppler reflects where the regurgitant orifice sits. When both mitral leaflets prolapse, the coaptation failure is central, creating a regurgitant opening that’s located near the middle of the valve. This central orifice produces a jet that projects toward the center of the left atrium rather than toward a specific wall. If only one leaflet prolapses, the orifice is off to one side, resulting in an eccentric jet directed toward the opposite atrial wall (anterior leaflet → jet toward posterior wall; posterior leaflet → jet toward anterior wall). Thus, a centrally directed MR jet most commonly occurs with bileaflet prolapse.

Jet direction on color Doppler reflects where the regurgitant orifice sits. When both mitral leaflets prolapse, the coaptation failure is central, creating a regurgitant opening that’s located near the middle of the valve. This central orifice produces a jet that projects toward the center of the left atrium rather than toward a specific wall. If only one leaflet prolapses, the orifice is off to one side, resulting in an eccentric jet directed toward the opposite atrial wall (anterior leaflet → jet toward posterior wall; posterior leaflet → jet toward anterior wall). Thus, a centrally directed MR jet most commonly occurs with bileaflet prolapse.