Clinical Learning
Clinical 6: Atrial fibrillation – diagnosis and stroke prevention
Detection of atrial fibrillation, stroke and bleeding risk assessment, anticoagulation principles and review using NICE NG196.
Clinical safety: Use current guidance, local policy and patient-specific judgement.
Learning objectives
• Confirm atrial fibrillation appropriately • Assess stroke risk using the NICE-recommended approach • Understand the role and limits of bleeding-risk assessment • Apply anticoagulation principles safely • Recognise when rate/rhythm or specialist review is needed
Clinical safety note
Anticoagulation, rate control and rhythm control are patient-specific and can cause harm. Check current BNF/MHRA and local pathways, especially for renal impairment, drug interactions, reversal and acute instability.
Detection and confirmation
When atrial fibrillation is suspected, palpate the pulse for irregularity and obtain a 12-lead ECG to make the diagnosis when an irregular pulse is detected. If paroxysmal AF is suspected but not captured on a standard ECG, use ambulatory ECG monitoring appropriate to symptom frequency.
Stroke and bleeding risk
Stroke prevention is a central part of AF management. NICE uses CHA2DS2-VASc to assess stroke risk and recommends that anticoagulation decisions take bleeding risk and patient preferences into account. Bleeding-risk assessment should identify modifiable factors; it should not be used simply as a reason to withhold anticoagulation without considering overall benefit and risk.
Anticoagulation principles
NICE recommends a direct-acting oral anticoagulant for many people in whom anticoagulation is indicated, with vitamin K antagonist therapy when a DOAC is contraindicated, not tolerated or unsuitable. Do not withhold anticoagulation solely because of age or falls risk. Exact choice and dose depend on renal function, comorbidities, interactions and product guidance.
Beyond anticoagulation
AF management also includes symptom control, rate or rhythm strategy, treatment of precipitating or associated conditions and regular review. New haemodynamic instability, heart failure, ongoing chest pain or other acute deterioration requires urgent assessment rather than routine outpatient management.
