Atrial fibrillation and heart failure

Atrial fibrillation removes the coordinated squeeze of the upper heart chambers and may make the lower chambers beat too quickly or unevenly. That can reduce efficient filling and pumping. If heart failure is already present, this rhythm change may bring more breathlessness, fatigue or swelling.

The relationship also works in the other direction: pressure and stretching within a heart affected by heart failure can make atrial fibrillation easier to develop or sustain. Symptoms overlap, so an examination, ECG and often blood tests or heart imaging help show what has changed.

Take prescribed medicines consistently and keep a current medication list. Treatment may slow the ventricular rate, restore or maintain rhythm, relieve fluid congestion and support the heart's pumping function. A separate assessment determines whether anticoagulation is appropriate for protection from clots and stroke.

Track changes that reflect congestion or reduced circulation: increasing ankle or abdominal swelling, needing more pillows to breathe comfortably, waking short of breath, unusual exhaustion, dizziness or reduced ability to walk. Follow any personalised plan for fluid, salt, activity and monitoring; do not independently stop a diuretic, rate-control medicine or anticoagulant.

Call emergency services for severe breathing difficulty at rest, chest pressure, fainting, blue or grey lips, confusion, or sudden weakness or speech difficulty. These symptoms can reflect poor circulation, a heart emergency or stroke and should not be watched at home.

Contact your care team promptly if swelling, breathlessness, palpitations or fatigue is clearly worsening, or if dizziness starts after a medicine change. Early review can identify fluid build-up, an unsuitable heart rate, low blood pressure or another trigger such as infection.

Ask whether the immediate priority is rate control, rhythm control or both; how heart function will be monitored; and which symptoms should activate your action plan. Confirm whether anticoagulation is advised, which medicines require blood tests, and whom to contact when swelling or breathing changes.