Atrioventricular nodal reentry tachycardia ... means there is one pathway that conducts slowly within the AV node and another that conducts quickly. A premature atrial contraction (PAC) or ...

or premature ventricular contraction (PVC) occurs at the right time, the normal conduction pathway will still be refractory, so the action potential will conduct through the slower AV nodal ...

Heart Rate Increase in rate of contraction of cardiac muscle - cardiac output increases Decrease in rate of contraction of cardiac muscle - cardiac output decreases Breathing Rate Smooth muscle of ...