Patients with left heart disease commonly develop pulmonary hypertension (PH) [1], initially due to passive backward transmission of high left ventricular filling pressures through the pulmonary circulation. Assessment of left atrial reservoir and pump function using changes in left atrial area over time are useful to differentiate patients with left heart disease from other cases of suspected pulmonary hypertension (Mann-Whitney u test p-value 0.0015 and 0.0067 respectively).
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