Vascular remodeling in adults after coarctation repair: impact of descending aorta stenosis and age at surgery

Olga Trojnarska, Ludwina Szczepaniak-Chicheł, Katarzyna Mizia-Stec, Marcin Gabriel, Agnieszka Bartczak, Stefan Grajek, Zbigniew Gąsior, Lucyna Kramer, Andrzej Tykarski, Olga Trojnarska, Ludwina Szczepaniak-Chicheł, Katarzyna Mizia-Stec, Marcin Gabriel, Agnieszka Bartczak, Stefan Grajek, Zbigniew Gąsior, Lucyna Kramer, Andrzej Tykarski

Abstract

Background: Patients after successful repair of coarctation of aorta (CoAo) are at risk of hypertension at rest and associated end-organ damage. The aim of the study was to assess arterial stiffness and function in adults after coarctation repair in relation to descending aorta (AoD) residual coarctation and patient's age at operation.

Methods: 85 patients after CoAo repair (53 males) aged 34.6 ± 10.3 years; median age at operation 0.9 ± 8.2 years. The control group-30 individuals (18 males) at mean age 33.6 ± 8.2 years. The following central parameters: augmentation pressure (AP) and augmentation index (AI) as well as peripheral vascular parameters: flow-mediated dilatation (FMD), nitroglycerin-mediated vasodilatation (NMD), intima-media thickness (IMT) and pulse wave velocity (PWV) were measured.

Results: 47 CoAo-repaired patients were normotensive, and compared to control, they presented higher values of central parameters AP (7.3 ± 4.6 vs. 4.4 ± 3.6 mmHg; p = 0.002) and AI (18.6 ± 10.4 vs. 13.5 ± 4.3%; p = 0.03); as well as the increased PWV (6.8 ± 1.2 vs. 5.4 ± 0.9 m/s; p = 0.003), while IMT was comparable (0.53 ± 0.01 vs. 0.51 ± 0.01 mm; p = 0.06). The vasodilatation was impaired in the normotensive patients: FMD (4.8 ± 2.8 vs. 8.5 ± 2.3%; p = 0.00003) and NMD (11.3 ± 4.6 vs. 19.8 ± 7.2%; p = 0.00001). The comparison of recoarctation (46, 54%) to non-recoarctation (39, 46%) patients did not reveal any significant differences in resting systolic and diastolic pressures, as well as the values of AI and the peripheral vascular parameters; the value of AP was higher in the recoarctation patients (10.5 ± 6.9 vs. 7.5 ± 4.1; p = 0.02) and correlated positively with the gradient across AoD (r = 0.295, p = 0.01). There was no significant linear correlation between age at the time of surgery and any of peripheral arterial parameters.

Conclusions: Residual stenosis in AoD does not affect the arterial vasodilatation nor stiffness in patients after CoAo repair. Early operation has no impact on peripheral vascular remodeling or central pressure which supports the claim that coarctation of the aorta is a systemic vascular disorder which leads to progressive vascular and end-organ damage despite early correction.

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