Consensus among music historians â with notable dissent â has been to start the era around 1400, with the end of the medieval era, and to close it around 1600, with the beginning of the Baroque period, therefore commencing the musical Renaissance about a hundred years after the beginning of the Renaissance as it is understood in other disciplines.
Atrial Flutter. Overview. Atrial flutter (AFL) is a type of abnormal heart rate, or arrhythmia. It occurs when the upper chambers of your heart beat too fast. When the chambers in the top of your heart (atria) beat faster than the bottom ones (ventricles), it causes your heart rhythm to be out of sync. Atrial flutter is a similar condition to the more common atrial fibrillation (AFib).
When they are noticed, we refer to them as palpitations â you can experience them as a fluttering feeling, or a sense that the heart has missed a beat, or a sudden forceful beat. Ectopic heartbeats can occur in perfectly healthy hearts, often without any cause.