[Myopathy associated with respiratory insufficiency: diagnostic difficulties in adult-onset Pompe disease].
BACKGROUND
Adult-onset acid maltase deficiency myopathy is a rare lysosomal storage disease with an autosomal recessive pattern of inheritance. The disease can be manifested with respiratory insufficiency and fatigue.


METHODS
A case of a 45-year-old male patient is presented, and difficulty in diagnosis is discussed.


RESULTS
The patient had been repeatedly examined because of hypersomnia, dyspnea and fatigue for a full year before a neurological consultation was requested. Artificial ventilation resulted in a dramatic improvement of his symptoms. Neurological examination revealed myopathy. Electrophysiological myotonia and glycogen storage in muscle biopsy specimen suggested acid maltase deficiency. The diagnosis was established by genetic testing detecting the previously described homozygous c.-45T > G mutation in the alpha-glucosidase gene.


CONCLUSIONS
Rare hereditary neurological diseases can be also suspected as cause of chronic unexplained respiratory insufficiency resulted in hypersomnia and fatigue due to hypercapnia and myopathy. A proper diagnosis can contribute to early diagnosis and introduction of enzyme replacement therapy may reduce or stop clinical progression. Genetic diagnosis can also provide a possibility for prenatal testing.
Merkli
Hajnalka
H
Pécsi Tudományegyetem, Altalános Orvostudományi Kar, Neurológiai Klinika, Pécs. hajnalka.merkli@aok.pte.hu
Pál
Endre
E
Nagy
Ferenc
F
Horváth
Rita
R
Várdi
Visy Katalin
VK
Komoly
Sámuel
S
Illés
Zsolt
Z
D017668:Age of Onset; D003937:Diagnosis, Differential; D005087:Glucan 1,4-alpha-Glucosidase / Q000172:deficiency*; D006009:Glycogen Storage Disease Type II / Q000150:complications* / Q000175:diagnosis*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009135:Muscular Diseases / Q000150:complications* / Q000201:enzymology / Q000473:pathology; D009154:Mutation; D012131:Respiratory Insufficiency / Q000209:etiology* / Q000628:therapy; D012132:Respiratory Muscles / Q000201:enzymology / Q000473:pathology; D000520:alpha-Glucosidases / Q000235:genetics
D000520:alpha-Glucosidases; D005087:Glucan 1,4-alpha-Glucosidase