Carotid intima-media thickness is increased in patients with mucopolysaccharidoses

Background

The feasibility of carotid artery intima-media thickness (C-IMT), an established cardiovascular disease marker, as a cardiac risk marker in mucopolysaccharidosis (MPS) patients was explored.

Objectives

To determine if C-IMT is abnormal in MPS versus unaffected controls, and if C-IMT correlates with coronary artery diameter in MPS.

Material and methods

Measurements of C-IMT via neck ultrasound and echocardiographic parameters, including coronary artery diameters, were obtained from MPS and control patients, and compared.

Results

Sixteen MPS subjects (6 MPS I, 6 MPS II, 2 MPS III, 1 MPS VI, 1 MPS VII) and sixteen age, ethnicity, and gender-matched controls were enrolled. Median MPS and control subject ages were 8.3 ± 4.5 and 8.6 ± 4.3 years, respectively (p = 0.73). Mean MPS and control C-IMTs were 0.54 ± 0.070 and 0.48 ± 0.034 mm (p = 0.0029). No differences in left main, left anterior descending, or right coronary artery diameters were seen between MPS and controls. A significant proportion of MPS subjects had mitral insufficiency (14/16; p = 0.0002), aortic insufficiency (10/16; p = 0.0021), and left ventricular dilatation (7/16, p = 0.037) versus controls. C-IMT did not correlate significantly with age, height, weight, coronary measurements, or duration of treatment.

Conclusion

C-IMT in MPS patients is increased compared to matched controls, likely reflective of arterial intima-medial glycosaminoglycan accumulation. MPS subjects demonstrated a high percentage of left-sided valvular insufficiency and ventricular dilatation. Additional studies should be performed in MPS patients to determine if C-IMT correlates with arterial elasticity, biomarkers of vascular dysfunction, and higher risk of cardiovascular events.