Journals / Türk Psikiyatri Dergisi / 2018 / Cilt: 29 - Sayı: 3

L-Arginine Add-On Treatment for Schizophrenia: A Randomized, Double-Blind, Placebo-Controlled, Crossover Study

Şizofrenide Mevcut Tedaviye Yardımcı Olarak L-Arjinin Eklenmesi: Rastgele, Çift Kör, Çapraz Geçişli, Plasebo Kontrollü Çalışma

Pages
147–153
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Studies with a larger sample size, with higher doses of L-arginine, and with a longer duration are needed for a definite conclusion.

📌 3 Key Takeaways

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Objective & Hypothesis:Objective: Current drug treatments for schizophrenia are only partially effective and combination/augmentation strategies are commonly used.
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Key Findings & Data:Method: The study was designed as a randomized, double-blind, placebo-controlled, crossover study of L-arginine 3 g b.i.d. as an add-on treatment to the patients’ usual medication.
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Conclusion & Impact:Studies with a larger sample size, with higher doses of L-arginine, and with a longer duration are needed for a definite conclusion.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

Objective: Current drug treatments for schizophrenia are only partially effective and combination/augmentation strategies are commonly used. Nitric Oxide (NO) may play a role in the pathophysiology of schizophrenia. L-arginine is the precursor of NO. In this study, we aimed to investigate whether L-arginine add-on to current medication might improve positive, negative, and depressive symptoms in schizophrenia/ schizoaffective disorder patients in partial remission. Method: The study was designed as a randomized, double-blind, placebo-controlled, crossover study of L-arginine 3 g b.i.d. as an add-on treatment to the patients’ usual medication. Twelve patients diagnosed with schizophrenia/schizoaffective disorder were included. The duration of the treatment was 3 weeks, with a wash-out period of 7 days before alternation for the second arm. Psychopathology was assessed with the Positive and Negative Syndrome Scale (PANSS), the Calgary Depression Scale for Schizophrenia (CDSS), and the Clinical Global Impression (CGI) scales. The study was supported by Hacettepe University Scientific Research and Development Office (Project No: 011D0110101013) (Clinical Trials.gov Identifier: NCT02398279). Results: Our analyses revealed that L-arginine 6 g/day add-on to usual treatment was not superior to placebo for positive, negative, and depressive symptoms associated with schizophrenia as assessed with PANSS, CDSS and CGI scales. Conclusion: In our study, L-arginine did not seem to have an effect on schizophrenia symptoms. Studies with a larger sample size, with higher doses of L-arginine, and with a longer duration are needed for a definite conclusion.

Özet

Amaç: Şizofrenide mevcut ilaç tedavileri kısmen etkili olduğundan güçlendirme veya kombinasyon tedavileri sık olarak uygulanmaktadır. Nitrik oksitin (NO) şizofreninin fizyopatolojisinde rol oynadığı öne sürülmektedir. L-arjinin NO öncülü olan bir esansiyel aminoasittir. Bu çalışmada şizofreni veya şizoafektif bozukluk tanısı konmuş klinik belirtileri kısmen devam eden hastaların mevcut tedavilerine eklenen L-arjinin’in, şizofreninin pozitif, negatif ve depresif belirtileri üzerindeki etkisinin incelemesi amaçlanmıştır. Yöntem: Çalışmaya 12 şizofreni veya şizoafektif bozukluk tanısı kon-muş hasta dahil edilmiştir. Hastaların mevcut tedavilerine günde iki kez 3 g L-arjinin rastgele, çift kör, plasebo kontrollü ve çapraz geçişli şekilde eklenmiştir. Üç haftalık tedavi döneminin ardından 7 günlük ilaçsız dö-nem ve daha sonra ikinci 3 haftalık tedavi dönemine geçilmiştir. Psiko-patoloji, Pozitif ve Negatif Belirtileri Değerlendirme Ölçeği (PANSS), Calgary Şizofrenide Depresyon Ölçeği (CDSS) ve Klinik Genel İzle-nim Ölçeği (CGI) ile değerlendirilmiştir. Çalışma Hacettepe Üniversi-tesi Bilimsel Araştırmalar Birimi tarafından desteklenmiştir (Proje No: 011D0110101013) (Clinical Trials.gov Numarası: NCT02398279). Bulgular: PANSS, CDSS ve CGI ile yapılan değerlendirmede mevcut tedaviye eklenen 6 g/gün L-arjinin’in pozitif, negatif ve depresif belirti-ler üzerindeki etkisi plasebodan farklı bulunmamıştır. Sonuç: Bu çalışmada L-arjinin’in şizofreni belirtileri üzerinde olumlu etkisi gösterilememiştir. L-arjinin’in şizofreni tedavisinde yararlı olup ol-madığını tespit edebilmek için daha büyük örneklemlerde, daha yüksek L-arjinin dozları ile daha uzun süreli çalışmalara ihtiyaç vardır.

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Cite This Article

KOÇYİĞİT, Y., YOCA, G., KARAHAN, S., AYHAN, Y., YAZICI, M. K. (2018). L-Arginine Add-On Treatment for Schizophrenia: A Randomized, Double-Blind, Placebo-Controlled, Crossover Study. Türk Psikiyatri Dergisi, Cilt: 29 - Sayı: 3, 147–153. https://ajindex.com/articles/91566

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