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HFrEF - Low Ejection Fraction on Physical Exam - Likelihood Ratios - Displaced Apical Impulse - Abnormal Valsalva Response - Elevated Neck Veins - Cheyne-Stokes Respirations - S3 Gallop - Normal Valsalva Response #HFrEF #LowEF #PhysicalExam #Likelihood #LRs #diagnosis #cardiology #CHF