SummaryA case of hyperkalemia associated with crush syndrome is reported.During treatment with the artificial kidney, a close relation between TV3wave amplitude and plasma K+level was demonstrated.There was also a relation between TV3wave amplitude (in mm) and plasma K+/Ca++ratio (in mEq/1).A survey of the literature shows that such relations have not been observ-ed in the human. The causes of these discrepancies are discussed.