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Two dimensional longitudinal atrial strain. A: PALS in a normal patient. Triphasic strain pattern is evident: Reservoire phase (RP), conduit (CoP) and contractile phase (CP); B: Reduced PALS in a patient with a large MV flail and severe MR, without triphasic strain pattern. PALS: Peak atrial longitudinal strain; MV: Mitral valve; MR: Mitral regurgitation.
