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(A) A paired t-test comparison of left atrial (LA) fractional shortening (%) measured by m-mode between cats receiving placebo and pimobendan is shown. Cats receiving pimobendan had significantly increased left atrial fractional shortening (P = 0.04). (B) A paired t-test comparison of left auricular flow velocity (cm/sec) measured by spectral Doppler between cats receiving placebo and pimobendan is shown. No significant differences were identified (P = 0.44).
