A heart arrhythmia is ... phase increases the refractory period (a "pause" between heartbeats) without affecting the sodium channels, helping maintain normal rhythm. Beta-blockers are more ...

An irregular heartbeat, or arrhythmia, is a condition where the heart beats too fast, too slow, or in an irregular pattern. While some irregular heartbeats are harmless and common, others can be a ...

An irregular heartbeat, or arrhythmia, is a condition where the heart beats too fast, too slow, or in an irregular pattern. While some irregular heartbeats are harmless and common, others can be a ...