Key result
Adenosine, NECA, and R-PIA exert negative inotropic effects in guinea-pig left atria by activating a common receptor population that increases potassium conductance and shortens action potential.
Why the study?
Does purinergic stimulation alter action potential, force of contraction, and ion fluxes in guinea-pig isolated left atria?
Does purinergic stimulation alter action potential, force of contraction, and ion fluxes in guinea-pig isolated left atria?
Adenosine and its analogs exert negative inotropic effects in guinea-pig atria by activating a common receptor that increases potassium conductance and reduces calcium influx.
No takes yet. Share an insight, caveat, or question.
Should not change clinical atrial arrhythmia management; hypothesis-generating for adenosine receptor effects in mammalian atria.
Jahnel et al. (1989) studied this question. Adenosine and analogues (NECA, R-PIA, S-PIA) vs. Control conditions or antagonists (theophylline, 8-phenyltheophylline) was evaluated on Force of contraction (negative inotropic effect). Adenosine, NECA, and R-PIA exert negative inotropic effects in guinea-pig left atria by activating a common receptor population that increases potassium conductance and shortens action potential.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: