Right Heart Dysfunction in Adults With Coarctation of Aorta: Prevalence and Prognostic Implications

Background: Chronic elevation of left heart filling pressure causes pulmonary vascular remodeling, pulmonary hypertension, and right heart dysfunction. Although diastolic dysfunction is relatively common in patients with coarctation of aorta, there are limited data about the prevalence and prognostic implications of pulmonary hypertension and right heart dysfunction in this population. The purpose of the study was to assess right heart function and hemodynamics in patients with coarctation of aorta and to determine the relationship between right heart indices and cardiovascular events defined as heart failure hospitalization, heart transplant, or cardiovascular death.

Methods: Right heart structure, function, and hemodynamics were assessed with these indices: right atrial volume, right atrial pressure, right atrial reservoir strain, right ventricular global longitudinal strain, right ventricular end-diastolic area, right ventricular systolic pressure, and tricuspid regurgitation severity. Right heart hemodynamic score, range 0 to 5, was generated based on the correlation between the right heart indices and cardiovascular events, using half of the cohort (derivation cohort, n=411), and then tested on the validation cohort (n=410). The goodness of fit and discrimination power was compared using C statistics and risk score.

Results: The median follow-up in the derivation cohort was 8.2 (4.0-11.1) years, and 59 (14%) patients had cardiovascular events during this period. Right heart hemodynamic score was independently associated with cardiovascular events (hazard ratio, 1.64 [95% CI, 1.38-2.17]) for every unit increase in right heart hemodynamic score after adjustment for clinical and echocardiographic indices (C statistic, 0.718 [95% CI, 0.682-0.746]). The right heart hemodynamic score was also independently associated with cardiovascular events in the validation cohort (C statistic, 0.711 [95% CI, 0.679-0.741]). The C statistic difference (0.007 [95% CI, 0.014-0.022]) and risk score (0.86 [95% CI, 0.54-1.17]) suggest a good model fit.

Conclusions: The current study underscores the prognostic importance of right heart dysfunction in patients with coarctation of aorta and suggests that right heart indices should be used for risks stratification in this population.