RVR stands for rapid ventricular response, which is a type of irregular heart rhythm that can occur in people with atrial fibrillation (AFib) . In AFib with RVR, the hearts electrical signals are disorganized, causing the upper heart chambers (atria) to contract in an uncoordinated way. These signals travel down to the lower chambers (ventricles) and tell them to beat in an irregular way, with a heart rate of over 100 beats per minute. Symptoms of AFib with RVR include a rapid or fluttering heartbeat, chest pain, shortness of breath, dizziness, fainting, tiredness, and weakness. RVR can cause serious complications and requires treatment, which may include medications, invasive procedures, and lifestyle changes. It is important to seek medical attention if you have symptoms of AFib with RVR, as it can lead to heart disease, heart failure, or stroke. It is worth noting that RVR can also refer to runway visual range, which is a critical component in determining the minimums for instrument landing systems during limited visibility conditions.