By the least square method, the mean electrical axes for P, QRS and T wave were measured in seven randomly bred laboratory cats originated from the authors' disease-free cat breeding colonies, under different anesthetic conditions.
1) In cats in right lateral recumbency anesthetized with pentobarbiton sodium, mean voltage (R) and degree of angle (θ) of mean electrical axes for P, QRS and T were as follows : R
P=0.059±0.011 MV, θ
P=81±7° R
QRS=0.067±0.037 MV θ
QRS=50±42°, R
T=0.104±0.046 MV and θ
T=73±20°.
2) In cats anesthetized with ketamin hydrochloride in the same body position as mentioned above, mean electrical axes for P, QRS and T were as follows: R
P=0.049±0.01 MV, θ
P=79±15°, R
QRS=0.054±0.032 MV, θ
QRS=109±40°R
T=0.11±0.003 MV and θ
T=50±22°.
3) In the case of horizontal plane in right lateral recumbency, the influence on the mean electrical axes revealed a significant difference between the two anesthetics (P<0.05), except θP.
4) Analysis was carried out on the variance among four different body positions on three plane. θ
QRS and θ
T only on the horizontal plane revealed a significant difference (P<0.05). Scattering was found on the transeverse plane. Further studies would be required on lead positions in the cat.
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