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1

The effects of Propiscin on the cardiac rate of isolated heart of common carp, Cyprinus carpio L.

100%
Hajek G. J., Klyszejko B., Dziaman R., Paczkowska E.
Acta Ichthyologica et Piscatoria
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2004
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tom 34
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nr 2
Background. The use of anaesthetics in aquaculture requires conducting specific physiological studies of its effect on fish. The objective of this study was to evaluate the direct effect of Propiscin (IRS Olsztyn, Poland) on the rate of isolated heart of common carp. Materials and Methods. The activity of isolated, perfused heart was recorded using an electrocardiograph. Propiscin was applied at concentrations of 2, 10, and 100 mlּl-1 of perfusion medium. Results. The study revealed a stimulating effect of Propiscin applied at a concentration of 10 mlּl-1, a depressing effect being recorded at a concentration of 100 mlּl-1. No effects were observed at the Propiscin concentration of 2 mlּl-1. Conclusion. It has been concluded that bradycardia accompanying the anaesthesia evoked by Propiscin at concentrations of 1 and 2 mlּl-1 of water is not a result of direct effect of Propiscin on the carp′s heart.
2

The effects of Propiscin [etomidate] on the behaviour, heart rate, and ventilation of common carp, Cyprinus carpio L.

100%
Hajek G. J., Klyszejko B.
Acta Ichthyologica et Piscatoria
|
2004
|
tom 34
|
nr 2
Background. The use of anaesthetics in aquaculture requires conducting specific studies of their effects on fish. The objective of this study was to evaluate the effects of Propiscin (Polish agent containing etomidate) on common carp behaviour, heart rate, and ventilation. Materials and Methods. Carp were anaesthetised with Propiscin at the concentrations of 1 and 2 mlּl-1. An electrocardiograph was used to record the heart rate and the amplitude and rate of the opercular movements. The effects of atropine and forced water flow over the gill system on the anaesthetised carp′s heart rate were also studied. Results. At either concentration, Propiscin caused general anaesthesia manifesting itself in: a loss of equilibrium, faded responses to external stimuli, gradual ventilation failure, and bradycardia. A high correlation between respiration rate and heart rate was found in the anaesthetised fish. Conclusion. The hypoxia was the direct cause of bradycardia, and the regularity and amplitude of breathing are the most important indicators of the level of Propiscin-evoked anaesthesia
3

Effect of 2-phenoxyethanol and etomidate on cardiac and respiratory functions and behaviour of common carp, Cyprinus carpio L. (Actinopterygii, Cypriniformes, Cyprinidae), during general anaesthesia

80%
Dziaman R., Hajek G., Klyszejko B.
Acta Ichthyologica et Piscatoria
|
2010
|
tom 40
|
nr 1
Background. Assessments of the efficacy of anaesthetics are usually based on observations of fish behaviour or changes in blood parameters. In this study we attempted to assess the process of anaesthesia, caused by 2-phenoxyethanol and Propiscin (0.2% etomidate), based on recording the heartbeat and the respiratory frequency. Materials and Methods. The effect of two concentrations of 2-phenoxyethanol (0.4 mL·L–1 and 0.8 mL·L–1) and two concentrations of Propiscin (1.0 mL·L–1 and 2.0 mL·L–1) on heartbeat and respiratory frequency of common carp, Cyprinus carpio L., were studied using ECG. Concurrently, during general anaesthesia, the fish behaviour was also observed. Results. The anaesthetic potential of 2-phenoxyethanol and Propiscin at the applied concentrations was comparable. The behavioural reactions caused by the agents were not identical. At the beginning of the exposure, 2-phenoxyethanol produced locomotor agitation and an irritation-like reaction of the respiratory system. Propiscin had no such effect. Both agents induced a decrease in the ventilatory and cardiac frequencies. The reductions caused by Propiscin were simultaneous. The inhibitory effect of 2-phenoxyethanol at the concentration of 0.8 mL·L–1 was much stronger on respiration than on heart rate. Conclusion. The ECG method can be an important and objective tool supplementing data acquired during visual observation of responses to anaesthesia. Its major advantage is the comparativeness of data.
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