Survey on Frequency of Various Forms of QRS Complex in Khuzestan River Buffalo

One of the major issue in the interpretation of electrocardiograms is consideration to variation in the shape of ECG waves that can be different at different times not only among members of a species, different ages or sexes, but also in one animal. In this study, variable forms of QRS complexes of Khuzestan buffaloes, was determined. One hundred buffaloes were divided into two age and two sex groups. In this study a base apex lead was used to record ECG for studying prevalence of different forms of QRS complexes and data analyzed using chi- square method. Complete QRS complex was seen only in one case and in all other cases this complex were identified as QS or RS that maximum frequency was belong to QS form (73%). Differences of various forms of QRS complexes with or without concomitant presence in sex group were not significant. The only difference between the frequency of RS among the younger age groups and more than 2.5 years was significant. Simultaneous presence of these figures show that the frequency difference of QS and QS with RS was significant in the two age groups (P