Open Access

ARTICLE

Long‐term cardiovascular outcome of Williams syndrome

Seul Gi Cha¹, Mi Kyung Song¹, Sang Yun Lee¹, Gi Beom Kim¹, Jae Gun Kwak², Woong Han Kim², Eun Jung Bae¹

1 Department of Pediatrics, Seoul National University Children’s Hospital, Seoul, South Korea
2 Thoracic and Cardiovascular Surgery, Seoul National University Children’s Hospital, Seoul, South Korea

* Corresponding Author: Eun Jung Bae, MD, PhD, Department of Pediatrics, Seoul National University Children’s Hospital, 101 Daehang‐Ro, Jongno‐gu, Seoul 110‐744, South Korea. Email:

Congenital Heart Disease 2019, 14(5), 684-690. https://doi.org/10.1111/chd.12810

Abstract

Objective: Cardiovascular lesions are the leading cause of morbidity and mortality in patients with Williams syndrome. Recent studies have rebutted conventional reports about the natural course of cardiovascular anomalies in Williams syndrome.
Design: Retrospective study.
Setting: Single tertiary center.
Patients: Eighty patients with Williams syndrome followed up for more than 5 years.
Interventions: Not applicable.
Outcome Measures: Long‐term outcome of cardiovascular lesions, peak velocity change in obstructive cardiovascular lesions over time, post‐interventional courses of disease‐specific intervention, and intervention‐free survival of obstructive cardio‐ vascular lesions.
Results: The median follow‐up duration was 11.0 (5.1‐28.3) years. Among 80 pa‐ tients, supravalvular aortic stenosis (87.5%) was the most common cardiovascular lesion, followed by branch pulmonary stenosis (53.8%), mitral valve prolapse (22.5%), and aortic arch hypoplasia/coarctation (5.0%). During the follow‐up period, the peak flow velocity of supravalvular aortic stenosis did not change on peak Doppler echo‐ cardiography. Initially, severe supravalvular aortic stenosis was aggravated (P < .027). Conversely, the peak velocity of branch pulmonary stenosis decreased (from 3.08 to 1.65 m/s; P < .001) within age 3.2 (0.4‐6.9) years. Even the group with severe branch PS improved over time. Twenty‐two patients (27.5%) with Williams syndrome under‐ went disease‐specific interventions without mortality, mostly for supravalvular aortic stenosis or mitral valve prolapse. No patient in the late‐onset and initially mild sup‐ ravalvular aortic stenosis group needed intervention and 37.5%, 48.4%, and 65.1% in initially moderate and severe supravalvular aortic stenosis groups needed inter‐ vention at age 5, 10, and 20 years, respectively. Unlike the conventional therapeutic concept, the intervention for branch pulmonary stenosis was almost unnecessary.
Conclusions: In Williams syndrome, initially severe supravalvular aortic stenosis worsened over time and most branch pulmonary stenoses, including those in the severe group, improved spontaneously. Most patients with branch pulmonary ste‐ nosis did not require disease‐specific intervention. Surgical repairs for cardiovascular abnormalities in Williams syndrome showed favorable results.

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