Sweating refers to the production of water on the skin to allow for cooling of the body. Classically associated with exercise and overheating, sweating in babies and infants can occasionally be a sign of a significant heart problem.
Normal electrical conduction refers to the normal passage of electricity through the heart tissue. Electricity typically originates in the sinus node in the top right corner of the heart. From there, it is transmitted through both the left and right atrium, and then passes through the AV node in the middle of the heart. The AV node transmits the electricity into the ventricles. As electricity moves through the ventricles, the ventricles contract, thereby pumping blood to the lungs and body.
Tachycardia refers to a faster than normal heart rate. Normal electrical conduction in the heart starts with the generation of electricity in the sinus node in the upper portion of the right atrium. Electricity moves from the sinus node through the atrium. From there, it is transmitted through the AV node to the ventricles. As electricity passes to the ventricles, the heart muscle contracts.
The term bradycardia refers to a slow heart rate. Normal electrical conduction in a child's heart involves the generation of electricity in the sinus node in the upper right portion of the heart. Electricity then travels through both atrium to the AV node in the middle of the heart. From here, electricity is spread out through both ventricles. As electricity moves through the ventricles, heart muscle contracts.