Atrial fibrillation with rapid ventricular response

In atrial fibrillation, disorganised electrical activity in the upper heart chambers produces an irregular pulse. Rapid ventricular response, often shortened to RVR, means many of those signals reach the lower chambers, making them contract rapidly. The episode can cause palpitations, breathlessness, chest discomfort, fatigue, weakness or dizziness, although some people notice few symptoms.

A fast rhythm can reduce how effectively the heart pumps. Clinicians confirm the rhythm with an electrocardiogram and may check blood pressure, oxygen level, blood tests and possible triggers such as infection, dehydration, thyroid disturbance or missed heart medicines.

If a fast or irregular heartbeat is new, persistent or accompanied by feeling unwell, arrange prompt clinical assessment. Sit down, avoid exertion and note when the episode began, your symptoms and any pulse reading available. Bring your medicine list and explain whether any doses were missed. Do not take an extra dose of a heart medicine unless a clinician has given you a specific plan for doing so.

Management depends on symptoms, blood pressure, other illnesses and how long the rhythm may have been present. Care may include slowing the ventricular rate, restoring rhythm in selected cases, treating a trigger and assessing whether anticoagulation is appropriate to reduce clot-related stroke risk.

Call emergency services for chest pain, severe breathlessness, fainting, marked weakness, confusion, or a fast irregular heartbeat with clammy skin or collapse. Sudden facial droop, arm weakness, speech difficulty, loss of balance or vision change can signal a stroke and also requires immediate emergency help. Do not drive yourself when these symptoms are present.

Ask what may have triggered the rapid rate, what pulse range should prompt a call, and whether you need a written action plan. Clarify how each medicine should be taken, what to do after a missed dose, whether anticoagulation suits your stroke-risk profile, and which follow-up tests are planned.