Lege Artis Medicinae

[Creatine deficiency - a possible cause of mental retardation]

VOJCEK Eszter, BARÁTH Ákos, SZTRIHA László, TÚRI Sándor, KARG Eszter

MARCH 20, 2011

Lege Artis Medicinae - 2011;21(03)

[Creatine plays a major role in the energy supply of brain and muscle tissues. In creatine deficiency states, insufficient energy supply of the brain tissue may lead to mental retardation with speech delay and behavioural problems, epilepsy and extrapyramidal symptoms, while that of the muscle tissue might result in hypotonia. Creatine deficiency has been shown to result either from dysfunction of the two enzymes involved in its synthesis, namely arginine:glycine amidinotransferase and guanidinoacetic methyltransferase, or from impairment of the SLC6A8 transporter protein that is responsible for the cellular uptake of creatine. Synthesis disorders can be efficiently treated by creatine supplementation. The therapy is the most efficient if it is started in time, before the development of irreversible damages. Thus, in case of mental retardation associated with delayed speech development or behavioural problems, or epilepsy of unknown origin, diagnostic tests for creatine deficiency are recommended as early as possible. In creatine-transport disorder, the results of treatments to increase the intracellular creatine pool are controversial]

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[INTRODUCTION - In systemic lupus erythematosus (SLE), both short-term and long-term survival rates have improved worldwide. We analysed retrospectively the short-term and long-term survival data and causes of death at a single center. These data were compared with previous survival data recorded at the same centre and published in international studies. PATIENTS AND METHOD - The data of 550 patients with SLE were analysed between 1970 and 2009. We examined the effect of clinical symptoms, age, severity and onset of the disease and the applied immunosuppressive treatment on survival, using the Kaplan-Meier method. RESULTS - Survival rates at 5, 10, 15 and 20 years after the diagnosis were 98%, 94%, 90% and 89%, respectively. Late onset, neuropsychiatric symptoms and severe SLE were found to be prognostic factors. Manifestations affecting other organs and the applied immunosuppressive therapy did not influence survival rates. During the study period, 57 out of the 550 patients (10.4%) died. The main causes of death were cardiovascular complications (50.9%), infections (21%), and malignancies (12.3%). CONCLUSIONS - Our results show that among patients with SLE, it is mostly longterm survival that has increased, owing to the close control of patients. The increase in cardiovascular mortality highlights the importance of regular screening.]

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