Myotonic Dystrophy Type 2 – Data from the Serbian Registry

Article type: Research Article

Authors: Bozovic, Ivo^a | Peric, Stojan^a | Pesovic, Jovan^b | Bjelica, Bogdan^a | Brkusanin, Milos^b | Basta, Ivana^a | Bozic, Marija^c | Sencanic, Ivan^d | Marjanovic, Ana^a | Brankovic, Marija^a | Savic-Pavicevic, Dusanka^b | Rakocevic-Stojanovic, Vidosava^{a; *}

Affiliations: [a] Neurology Clinic, Clinical Center of Serbia, School of Medicine, University of Belgrade, Belgrade, Serbia | [b] Faculty of Biology, Center for Human Molecular Genetics, University of Belgrade, Belgrade, Serbia | [c] Ophthalmology Clinic, Clinical Center of Serbia, School of Medicine, University of Belgrade, Belgrade, Serbia | [d] Ophthalmology Clinic, Clinical Center Zvezdara, Belgrade, Serbia

Correspondence: [*] Correspondence to: Vidosava Rakocevic-Stojanovic, Neurology Clinic, Clinical Center of Serbia, School of Medicine, University of Belgrade, 6, Dr. Subotic Street, 11 000 Belgrade, Serbia. Tel.: +381 64 2228779; Fax: +381 11 2684577; E-mail: [email protected].

Abstract: Background:Myotonic dystrophy type 2 (DM2) is a multisystem disorder, mostly presented with mild but heterogeneous spectrum of symptoms. Objective:The aim of this research was to provide detailed sociodemographic, clinical and laboratory data of a large DM2 cohort from the Serbian registry. Methods:In 2008, we started to prospectively enter data of all DM patients. We also retrospectively collected data of patients hospitalized from 1990 until 2008. Results:At the end of 2017, registry comprised 87 (68%) of 128 genetically confirmed DM2 patients in Serbia, i.e. 1.2 registered cases per 100,000 inhabitants. Female subjects were more prevalent (63%). The diagnostic delay was 11.8±11.3 years. The most common first symptoms in our patients were lower limb weakness, handgrip myotonia and limb pain, although some percentage of patients presented with cataracts or extrapyramidal symptoms and signs. Lens opacities were present in 75% of patients. Severe ECG abnormalities were noted in 8% and pacemaker was implanted in 5% of DM2 subjects. Pulmonary restriction was observed in 10% of DM2 patients. Insulin resistance and diabetes mellitus were frequent in our cohort (21% and 17%, respectively). Male subjects more frequently had snoring, baldness, sterility, polyneuropathy, lower HDL and higher glycaemia, while waddling gait and increased muscle reflexes were more common in females. Conclusions:This registry offers a spectrum of different features presented in Serbian DM2 population, which could be at service of earlier diagnosis and better treatment.

Keywords: Myotonic dystrophy type 2, registry, gender, cataracts, cardiac conduction defects

DOI: 10.3233/JND-180328

Journal: Journal of Neuromuscular Diseases, vol. 5, no. 4, pp. 461-469, 2018