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Yıl:2000; Cilt: 10; Sayı: 2>> Özet
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Klinik Psikofarmakoloji Bülteni; 2000;10(2):57-63
İlaçsız şizofreni hastalarında negatif ve pozitif belirtilerin bölgesel beyin kan akımı ile ilişkisi
E Eşel, M Kula, AS Gönül, M Baştürk, T Turan, S Sofuoğlu, S Yılmaz
Erciyes University School of Medicine, Kayseri
Amaç: Şizofreni hastalarında yapılan fonksiyonel beyin görüntüleme
çalışmalarının çoğu frontal hipoperfüzyon hipotezini desteklemekle
birlikte, diğer kortikal bölgelerin perfüzyonunda değişiklikler olduğunu bildiren çalışmalar da vardır. Bu çalışmada
şizofreninin negatif ve pozitif belirtilerinin farklı beyin bölgelerindeki
kan akımı anormallikleri ile ilişkisinin araştırılması amaçlanmıştır. Yöntem: Çalışmaya DSM-IV şizofreni tanı kriterlerini
karşılayan 20 hasta (14 erkek, 6 kadın) ve yaş ve cinsiyet bakımından
karşılaştırılmış 17 sağlıklı denek (12 erkek, 5 kadın) dahil
edildi. Hastaların semptomları PANSS (Pozitif ve Negatif Semptom
Skalası) ile değerlendirildi ve Tc99m-HMPAO kullanılarak
SPECT çekimleri yapıldı. Bulgular: Şizofreni hastalarının kontrollere
göre frontal ve temporal hipoperfüzyon gösterdikleri bulundu.
PANSS ile değerlendirildiğinde, büyüklük Şkirleri ile sol
temporal ve parietal bölge kan akımı değerleri arasında pozitif
bir ilişki, şüphecilik-kötülük görme skorları ile tüm frontal bölgeler
ve sağ temporoparietal bölge kan akımı değerleri arasında
negatif bir ilişki olduğu gözlendi. Emosyonel çekilme semptomu
ile bilateral temporal kan akımı değerleri arasında negatif bir
ilişki vardı. Negatif semptomlarla frontal kan akımı arasında herhangi
bir ilişki tespit edilemedi. Tartışma: Çalışmanın sonuçları
şizofreni hastalarında frontal ve temporal bölgelerdeki kan akımının azalmış olduğu hipotezini desteklemektedir. Ayrıca farklı
pozitif ve negatif semptomlar beynin farklı bölgelerindeki anormalliklerle
ilişkili gibi görünmektedir.
Negative and positive symptoms: In relation to regional cerebral blood flow in drug-free schizophrenic patients
Objective: Although most of the functional neuroimaging studies
in schizophrenic patients have supported the hypothesis of
frontal hypoperfusion, there are some studies which indicates
that the perfusion of some other cortical regions are also affected.
In this study, we aimed to investigate whether negative
and positive symptoms of schizophrenia were related to abnormal
blood perfusion in different cerebral areas. Method:
Twenty drug-free patients (14 male, 6 female) who fully met
DSM-IV criteria for schizophrenia and 17 age and sex matched
healthy volunteers (12 male, 5 female) were included in the
study. Symptoms of the patients were assessed by PANSS (Positive
and Negative Symptom Scale) and regional CBF images
were obtained by SPECT using 99mTc-HMPAO as a radiopharmaceutical.
Results: We found frontal and temporal hypoperfusion
in schizophrenic patients compared to the controls. As assessed
with PANSS, ideas of grandiosity were correlated positively
with the left temporal and parietal cortical perfusion values,
and suspiciousness/persecution ideas were correlated negatively
with all frontal and right temporoparietal rCBF values.
There were negative correlation between emotional withdrawal
scores and bilateral temporal rCBF values. We did not find any
relation between reduced frontal perfusion and negative symptoms.
Conclusion: Our results support the hypothesis that brain
perfusion is reduced in frontal and temporal regions of schizophrenic
patients. Furthermore, different positive and negative
symptoms seem to originate from different brain areas, such
as frontal, temporal and parietal regions.

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