Final answer:
Severe atrial arrhythmias include atrial fibrillation, atrial flutter, and paroxysmal supraventricular tachycardia.
Step-by-step explanation:
More severe atrial arrhythmias include:
- Atrial fibrillation: This is a condition where the electrical pattern in the atria is abnormal, resulting in a rapid and irregular heartbeat. It can be a serious condition that may require medical intervention.
- Atrial flutter: Similar to atrial fibrillation, atrial flutter is characterized by a rapid but regular heartbeat. It can also be a more severe form of atrial arrhythmia.
- Paroxysmal supraventricular tachycardia (PSVT): PSVT is a condition where the heart suddenly starts beating very fast due to abnormal electrical signals in the upper chambers of the heart.