Need to use Firefox or Chrome The rapid fall in dV/dt max that occurs when the K level rises above 6.5-7.0 mM and the RMP becomes less negative than -70 mV is the reason that an increase in serum K level above 6.5-7.0 mM is a true medical emergency requiring immediate therapy. Book traversal links for 5.2.16 (25) 5.2.15 (24) Up 5.2.17 (26)