Isoniazid and rifampicin (IRC) have been shown to cause hepa-totoxicity in both clinical and preclinical studies. Oxidative stress and in-flammation have been held responsible for the pathogenesis of IRC-induced hepatotoxicity. Antioxidative and anti-inflammatory effects of thiamine py-rophosphate (TPP) and cinnamon extract (CE) have been shown in previous studies. Therefore, our study investigated the protective effects of TPP and CE on possible liver damage caused by IRC treatment in rats. Twenty-four albino Wistar rats were categorized into four groups: a healthy group (HG), an IRC group (IRG), a TPP+IRC group (TIRG), and a CE+IRC group (CIRG). TPP (25 mg/kg) was administered intraperitoneally to TIRG, while CE (100 mg/kg) was administered orally to CIRG. In IRG, TIRG, and CIRG, isoniazid (50 mg/kg) and rifampicin (50 mg/kg) were administered orally one hour after these treatments. For seven days, this procedure was repeated once a day. After this period, blood samples were taken from the tail veins, and the rats were sac-rificed. The removed liver tissues were analyzed for oxidant, antioxidant, and proinflammatory cytokines and subjected to histopathological evaluation. Serum alanine aminotransferase and aspartate aminotransferase activities were also measured. An increase in malondialdehyde, nuclear factor kappa B, tumor necrosis factor-alpha, interleukin 1 beta, and interleukin-6 levels, a decrease in total glutathione levels, superoxide dismutase and catalase activi-ties, and an increase in alanine aminotransferase and aspartate aminotrans-ferase activities were found with IRC treatment (p<0.001). The histopatho-logical analysis of the IRG suggested hepatotoxicity (p<0.001). TPP and CE administered with IRC inhibited the biochemical changes (p<0.001). In the TIRG, this inhibition was higher than in the CIRG (p<0.05). Histological damage was inhibited by TPP (p<0.001). CE prevented biochemical changes but not histological changes except inflammatory cell infiltration. Therefore, TPP may be better than CE in preventing IRC-induced hepatotoxicity.

Ömrünü eğitime ve tıp bilimine adamış, pediatri alanında kendi eğitimini tamamlayan ve hala sürdüren yazarlarımız ile iki yıldır süren çalışmalarımızın meyvesi olan kitabımız için çok mutluyuz. Yedi yaşından beri gece gündüz demeden çalışan, pediatri uzmanlığını ve yan dalını hakkıyla tamamlamak için çok emek harcayan arkadaşlar, tecrübelerini ve öğrendiklerini eğitime yeni başlayan meslektaşlarına aktarmak için bir kılavuz olacak bu kitabı hazırladık. Bu kitabın; pratisyen hekim, pediatri asistanları ve uzmanlarına klinik pratikte en sık karşılaşacakları hastalıkların tanısı, kliniği ve tedavisi konusunda hızlıca bilgilere ulaşabilmeleri açısından çok büyük kolaylık sağlayacağına inanıyoruz. Bu nedenle acillerde, polikliniklerde ve servislerde sıkça başvurulan bir kitap olacağını düşünüyoruz.