Effects of seasonal acclimatization on temperature dependence of cardiac excitability in the roach, Rutilus rutilus

@article{Badr2016EffectsOS,
  title={Effects of seasonal acclimatization on temperature dependence of cardiac excitability in the roach, Rutilus rutilus},
  author={Ahmed Badr and M. F. El-Sayed and Matti Vornanen},
  journal={Journal of Experimental Biology},
  year={2016},
  volume={219},
  pages={1495 - 1504}
}
ABSTRACT Temperature sensitivity of electrical excitability is a potential limiting factor for performance level and thermal tolerance of excitable tissues in ectothermic animals. To test whether the rate and rhythm of the heart acclimatize to seasonal temperature changes, thermal sensitivity of cardiac excitation in a eurythermal teleost, the roach (Rutilus rutilus), was examined. Excitability of the heart was determined from in vivo electrocardiograms and in vitro microelectrode recordings of… 
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TLDR
Findings show that thermal tolerance limits of K+ currents in isolated myocytes between seasonally acclimatized roach are much less pronounced than the heat sensitivity of ECG variables in intact fish.
Effects of seasonal acclimatization on thermal tolerance of inward currents in roach (Rutilus rutilus) cardiac myocytes
TLDR
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TLDR
Although high [K+]o antagonizes the negative effects of high temperature on excitation threshold, the precipitous depression of the rate of AP upstroke and complete loss of excitability in some myocytes suggest that the combination of highTemperature and high [ K+]O will severely impair ventricular excitabilityIn roach.
Effects of prolonged anoxia on electrical activity of the heart in crucian carp (Carassius carassius)
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Low temperature pre-conditions the crucian carp heart for prolonged anoxia by changes in activity of excitation–contraction coupling genes and thereby allows sustained bradycardia and prolongation of ventricular action potential when oxygen shortage sets in.
The temperature dependence of electrical excitability in fish hearts
  • M. Vornanen
  • Chemistry, Medicine
    Journal of Experimental Biology
  • 2016
TLDR
At the extremes of environmental temperature, electrical excitability of the heart and other excitable tissues may set limits to temperature tolerance of fishes and other ectotherms.
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TLDR
It is strongly suggested that the frequency generator of the sinoatrial pacemaker cells does not limit fH at high temperatures in the brown trout in vivo.
The thermal acclimation potential of maximum heart rate and cardiac heat tolerance in Arctic char (Salvelinus alpinus), a northern cold-water specialist.
TLDR
If wild Arctic char have access to suitable temperatures (<18 °C) for a sufficient duration, warm acclimation can potentially mitigate some of the cardiorespiratory impairments previously documented during acute heat exposure.
Reduced ventricular excitability causes atrioventricular block and depression of heart rate in fish at critically high temperatures
ABSTRACT At critically high temperature, cardiac output in fish collapses as a result of depression of heart rate (bradycardia). However, the cause of bradycardia remains unresolved. To investigate
Adrenergic tone benefits cardiac performance and warming tolerance in two teleost fishes that lack a coronary circulation
TLDR
These findings are consistent with the hypothesis that adrenergic stimulation improves cardiac performance during acute warming, which, at least in perch, increases acute thermal tolerance.
Autonomic cardiac regulation facilitates acute heat tolerance in rainbow trout: in situ and in vivo support
TLDR
It is shown for the first time that cardiac adrenergic stimulation and cholinergic inhibition can enhance acute heat tolerance in rainbow trout at the level of the heart and the whole animal.
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