We examined right ventricular (RV) and ascending pulmonary artery (PA1) dimensions in adults with osteogenesis imperfecta (OI). The survey included 99 adults with OI divided in 3 clinical types (I, III, and IV) and 52 controls. RV and PA1 dimensions were measured by echocardiography and indexed for body surface area. Scoliosis was registered, and spirometry was performed in 75 patients with OI. All RV dimensions indexed by body surface area were significantly larger in the OI group compared to controls (RV basal dimension 1.9 ± 0.5 vs 1.7 ± 0.3 cm/m(2), p <0.05; RV midcavity dimension 1.7 ± 0.5 vs 1.5 ± 0.3 cm/m(2), p <0.05; RV longitudinal dimension 4.3 ± 1.1 vs 4.0 ± 0.9 cm/m(2), p <0.05). RV outflow tract (RVOT) proximal diameter (1.8 ± 0.4 vs 1.5 ± 0.2 cm/m(2), p <0.05), RVOT distal diameter (1.2 ± 0.2 vs 1.0 ± 0.1 cm/m(2), p <0.05), and PA1 (1.2 ± 0.3 vs 1.0 ± 0.2 cm/m(2), p <0.05) were also significantly larger in the OI group. Furthermore, all RV dimensions and PA1 were significantly larger in patients with OI type III compared to patients with OI types I and IV and controls. There were no differences in RV, RVOT, or PA1 dimensions between patients presenting a restrictive ventilatory pattern (n = 11) and patients a normal ventilatory pattern. Scoliosis was registered in 42 patients. Patients with OI type III had greater RV and PA1 dimensions compared to controls and patients with OI types I and IV. Impaired ventilatory patterns and scoliosis did not have any impact on RV dimensions in these patients. In conclusion, patients with OI had increased RV and PA1 dimensions compared to the control group.
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