12-20-04    From David Anderson DVM  Ohio State University:


"ECG" electrocardiographic parameters


Determination of electrocardiographic parameters in healthy llamas and alpacas.

Marc S. Kraus, DVM; Clay A. Calvert, DVM; Alan W. Spier, DVM, PhD; Kathryn
M. Meurs, DVM, PhD; David E. Anderson, DVM *
The objective of this research was to determine electrocardiographic
parameters in healthy llamas and alpacas.
23 llamas and 12 alpacas were studied. Electrocardiography was performed in
nonsedated standing llamas and alpacas by use of multiple simultaneous lead
recording (bipolar limb, unipolar augmented limb, and unipolar precordial
leads).Common features of ECGs of llamas and alpacas included low voltage of
QRS complexes, variable morphology of QRS complexes among camelids, and mean
depolarization vectors (mean electrical axes) that were directed
dorsocranially and to the right. Durations of the QT interval and ST segment
were negatively correlated with heart rate.ECGs of acceptable quality can be
consistently recorded in nonsedated standing llamas and alpacas. Features of
ECGs in llamas and alpacas are similar to those of other ruminants. Changes
in the morphology of the QRS complexes and mean electrical axis are unlikely
to be sensitive indicators of ventricular enlargement in llamas and alpacas.
(Am J Vet Res 2004;65:1719-1723)
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