Determination of normal values of intervals and segments of the electrocardiogram in Khuzestan River Buffalo (Bubalus bubalis)

Electrocardiography is an important diagnostic technique in conjunction to cardiac problems, therefore its standardization is necessary among various livestock and also different breeds of a species because species differences can influence ECG parameters. Determination of normal Intervals and segments of the electrocardiogram can help identify heart abnormalities especially arrhythmias. The present study was performed to determine normal duration of intervals and segments of the electrocardiogram on 100 apparently healthy river buffaloes. For this purpose the buffaloes were divided into male and female and according to dental formula to two age groups (less than 2.5 and more than 2.5 years of age). After taking the anamnesis and performing a clinical examination, the electrocardiogram was obtained based on base- apex lead system with lead II of the electrocardiograph, paper speed of 25mm/sec and sensitivity of 10 mv/min. Results showed that regardless of age and sex, the median and interquartile range of P-R, Q-T and R-R intervals and PR, ST and TP segments were 0.22±0.03, 0.36±0.04, 0.89± 0.16, 0.12± 0.02, 0.21± 0.05 and 0.30± 0.12 second respectively. Statistical tests showed that there is a significant difference in relation to the P-R interval and PR segment between the two sexes and also P-R, Q-T interval and PR segment in the two age groups (p