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(a) Right heart metric relationships (b) Grading system for chamber quantification. Grading systems are guided by reference limits and outcome analysis. In PAH, high risk is defined as a 1‐year risk of mortality > 20%. To identify consistent thresholds for right chamber quantification, we first selected a high‐risk cohort and then identify thresholds based on outcome analysis with other supporting criteria. PAH, pulmonary arterial hypertension.
