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Purk­inje Fibres

Action Poten­tial Record­ings from Purk­inje Fibres (Rab­bit or Dog)

Rab­bit: the most sen­si­tive model to study QT prolongation

Stan­dard Pro­to­col for GLP stud­ies:
  • six prepa­ra­tions
  • Four cumu­la­tive increas­ing con­cen­tra­tions of assay compound
  • Washout period or pos­i­tive con­trol at the end of the experiment
  • Stim­u­la­tion rates: 1 Hz and 0.2 Hz (reverse use dependency)

Treated groups could be com­pared to a con­trol vehi­cle group per­formed in the same conditions.

Options: Exter­nal hypokaliemic con­di­tions, chronic pre-​treatment, incre­men­tal stim­u­la­tion rate.

Mea­sured para­me­ters:
  • Rest­ing poten­tial (RP) (mV)
  • Max­i­mal rate of depo­lar­iza­tion (dV/​dtmax) (V/​s)
  • Action Poten­tial Ampli­tude (APA) (mV)
  • Action Poten­tial Dura­tion at 50%, 70% and 90% of repo­lar­iza­tion (ms) = APD50, APD70, APD90
    APD9040, APD40 if nec­es­sary (triangulation)
Ref­er­ence com­pounds
  • sotalol
  • quini­dine
  • ziprasi­done
  • haloperi­dol
  • sparfloxacin
  • cis­apride
  • parox­e­tine


figure purkinje fiber