| Summary: | The impact of a dilated left ventricular (LV) on right ventricular (RV) diastolic function has not been investigated. We hypothesized that in patients with a patent ductus arteriosus (PDA), LV dilation causes elevation of the RV end-diastolic pressure (RVEDP) through ventricular-ventricular interaction. We identified patients' ages 6 months to 18 years who underwent transcatheter PDA closure at our center from 2010 to 2019. One hundred and thirteen patients were included with a median age of 3 years (0.5–18). The median LV end-diastolic dimension (LVEDD) Z-score was 1.6 (−1.4–6.3). RVEDP was positively associated with RV systolic pressure (0.38, P < 0.01), ratio of pulmonary artery/aortic systolic pressure (0.4, P < 0.01), and pulmonary capillary wedge pressure (0.71, P < 0.01). RVEDP was not associated with LVEDD Z-score (0.03, P = 0.74). In children with a PDA, RVEDP was not associated with LV dilation, but was positively associated with RV systolic pressure.
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