
Discusses a case of atrial fibrillation in a 63-year-old woman, noting irregular rr, absence of p waves, and plans thyroid investigations, echocardiography, and pharmacological cardioversion with bisoprolol and digoxin.
Explain atrial fibrillation classification, pathophysiology, and complications, and outline thyroid function testing for thyrotoxicosis, imaging, and pharmacologic or electrocardioversion with bisoprolol or digoxin.
Identify atrial fibrillation symptoms, including palpitations, chest pain, dizziness, weakness, fatigue, shortness of breath, and sometimes asymptomatic, and summarize its types and chaotic cardiac signaling from SA node to ventricles.
Atrial fibrillation (AFib) is an irregular and often very rapid heart rhythm. An irregular heart rhythm is called an arrhythmia. AFib can lead to blood clots in the heart. The condition also increases the risk of stroke, heart failure and other heart-related complications.
During atrial fibrillation, the heart's upper chambers — called the atria — beat chaotically and irregularly. They beat out of sync with the lower heart chambers, called the ventricles. For many people, AFib may have no symptoms. But AFib may cause a fast, pounding heartbeat, shortness of breath or light-headedness.
Episodes of atrial fibrillation may come and go, or they may be persistent. AFib itself usually isn't life-threatening. But it's a serious medical condition that needs proper treatment to prevent stroke.
Treatment for atrial fibrillation may include medicines, therapy to shock the heart back to a regular rhythm and procedures to block faulty heart signals.
A person with atrial fibrillation also may have a related heart rhythm problem called atrial flutter. The treatments for AFib and atrial flutter are similar.
Symptoms
Symptoms of AFib may include:
Feelings of a fast, fluttering or pounding heartbeat, called palpitations.
Chest pain.
Dizziness.
Fatigue.
Lightheadedness.
Reduced ability to exercise.
Shortness of breath.
Weakness.