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The present study was conducted to obtain electrocardiographic data regarding the values of ST-segment morphology and duration from 84 apparently healthy Holstein cattle in fourteen different age groups from newborn to 7 years old. We recorded electrocardiograms in standard base apex lead system with the paper speed 25 mm/sec. and calibration of 10 mm equal to 1 mV. The morphologic assessments of electrocardiograms showed that all groups had normal isoelectric ST-segment, except newborns. Elevation of ST-segment was detected in 64.2% of newborn calves. The magnitude of this up sloping was 0.10±0.03 mV. The results of the comparison of ST-segment duration among different age groups showed that there were significant differences between the ST-segment duration of newborns (0.11±0.02, sec) and 5 years old (0.16±0.03, sec.), and also between 15 days (0.09±0.03, sec.) and 5 years old (P<0.05). The results of the present study may be accepted as normal ST-segment duration and morphology in different age groups of healthy Holstein cattle which will provide a good basis for judging and interpreting electrocardiograms. Key Words: Electrocardiography, ST-segment, morphology, Holstein cattle OZET FARKLI YAŞ GRUPLARINDA SAĞLIKLI OLARAK GOZLENEN SIYAH ALACA SIĞIRLARDA BASE APEKS DERIVASYONUNDAKI STANDART ELEKTROKARDIYOGRAMDA ST SEGMENT ARALIĞININ VE MORFOLOJISININ DEĞERLENDIRILMESI Bu calismada yeni dogandan 7 yasina kadar 14 farkli yas grubunda bulunan 84 adet saglikli Siyah Alaca sigirda ST segment morfolojisi degerlerine ait elektrokardiyografik verilerin elde edilmesi amaclanmistir. Elektrokardiyogramlar standart base apeks derivasyon sisteminde, 25mm/sn kagit hizinda ve 1mV'ye esit 10mm kalibrasyonda kayit edilmistir. Elektrokardiyogramlarin morfolojik degerlendirilmesi sonucunda yeni doganlar haricinde tum gruplarin normal izoelektrik ST segmentine sahip olduklari gozlenmistir. Yeni doganlarin %64,2'sinde ST segmentinde yukselme tespit edilmistir. Bu yukselme miktarinin egimi 0,10±0,03 mV olarak saptanmistir. ST segment araliginin farkli yas gruplari arasinda karsilastirilmasi sonucu; yeni doganlar (0,11±0,02 sn) ile 5 yasindakiler (0,16±0,03 sn) ve 15 gunluk (0,09±0,03 sn) ile 5 yasindakiler arasinda onemli bir farklilik belirlenmistir (P<0,05). Bu calismanin sonuclari, farkli yas gruplarindaki saglikli Siyah Alaca sigirlarda ST segment araligi ve morfolojisi normal olarak kabul edilerek, elektrokardiyogramlarin degerlendirilmesi ve yorumlanmasinda iyi bir kaynak olusturacaktir. Anahtar Kelimeler: Elektrokardiyografi, ST-segment, morfoloji, Siyah Alaca sigir

dergipark (istanbul university)

Evaluation of ST-Segment Duration and Morphology of Standard Base Apex Lead Electrocardiograms in Different Age Groups of Apparently Healthy Holstein Cattle