It depdends: There are many causes of toe spasms/cramps and it is important to identify the source. Cramps and spasms can be due to dehydration and low potassium. But they can also be due to a nerve conditions as well. I recommend you see a specialist for further evaluation. ...Read more.
1 The SA node (called the pacemaker of the heart) sends out an electrical impulse. 2  The upper heart chambers (atria) contract. 3  The AV node sends an impulse into the ventricles.  The lower heart chambers (ventricles) contract or pump.
Conduction block: The electrical pathway may also be blocked near the AV node, in between the atria and ventricles. A conduction block doesn't completely stop the heartbeat because another set of cells in the AV node or ventricles act as a secondary pacemaker. When this backup system goes into effect, the heartbeat is slower than when it is regulated by the SA node, which serves as the atrial pacemaker.