Hyperkalemia: This is a condition of abnormally elevated plasma K+ concentration (>5 meq/l) (Table 24). The P wave decreases in magnitude, and eventually all SA nodal and atrial cells are depolarized such that neither fast nor slow currents flow (Figure 28). The R wave height decreases, while the T wave becomes elevated and then prolonged. Eventually, at high enough K+ levels the heart ceases contraction in diastole (completely relaxed).
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