Key result
Intravenous infusion of KCl in anesthetized dogs frequently resulted in complete A-V block, demonstrating that A-V conduction tissue is more sensitive to potassium than other heart tissues.
Why the study?
Does intravenous infusion of KCl induce complete A-V block in anesthetized dogs?
Does intravenous infusion of KCl induce complete A-V block in anesthetized dogs?
In a canine model, rapid potassium infusion induces complete AV block, highlighting the heightened sensitivity of AV conduction tissue to hyperkalemia compared to atrial and ventricular myocardium.
Demonstrates AV conduction vulnerability to potassium in canines; leaves open translation to human hyperkalemia.
Intravenous infusion of KC1 at a rate of 1.22 or 2.45 mEq per minute to anesthetized dogs frequently resulted in complete A-V block at a time when P waves were still recorded in the ECG. Furthermore, some of the observations suggest that in hyperkalemia a regular idioventricular rhythm may not be essential for the diagnosis of complete atrioventricular (A-V) block. Thus, with complete A-V block induced during a rapidly changing plasma K + , the ventricular pacemaker may be irregular. In addition, evidence was obtained that some parts of the atrial tissue, the automatic ventricular focus and the ventricular myocardium, are more resistant to K + than is the A-V conduction tissue. The relative sensitivity of the various tissues of the heart seems to depend, among other factors, on the rate of KCl infusion.
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Fisch et al. (1966) studied Complete Atrioventricular Block. Intravenous infusion of KCl was evaluated on Complete A-V block. Intravenous infusion of KCl in anesthetized dogs frequently resulted in complete A-V block, demonstrating that A-V conduction tissue is more sensitive to potassium than other heart tissues.
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