Patient Guide
Atrial Fibrillation (AF) & Blood Thinners
An irregular heartbeat — and why we treat it
5×the stroke risk if AF is left untreated
60–70%lower stroke risk with the right blood thinner
Common1 in 4 of us will develop AF later in life
What's going on, in plain English
It's an electrical issue
The top chambers of your heart quiver instead of pumping cleanly. The pulse becomes irregular — sometimes fast, sometimes slow.
Sometimes you feel it
Palpitations, breathlessness, tiredness or chest fluttering. Sometimes there are no symptoms at all — just an irregular pulse on a check.
The big risk is stroke
Blood can pool in the quivering chambers and form clots. If one travels to the brain, it causes a stroke.
Blood thinners change that
They make clots far less likely. They're the single most important part of treatment for most people with AF.
Rate matters too
A tablet to slow your heart rate down (often a beta-blocker) makes you feel better and protects the heart over time.
Triggers can be tamed
Alcohol, caffeine, poor sleep, untreated sleep apnoea and being unwell can all set AF off. Addressing them really helps.
Why we calculate your stroke risk Your GP uses a simple score (CHA₂DS₂-VA) based on your age and health history. It tells us whether the benefit of a blood thinner clearly outweighs the small bleeding risk. For most people with AF, it does — by a long way.
Six things that help you do well
Take it every day
Blood thinners only work while they're in your system. Missing doses lets the stroke risk creep back fast.
Tell every doctor & dentist
Before any surgery, dental work or new medicine, tell them you're on a blood thinner. It matters.
Watch for bleeding
Mild bruising is common. Significant bleeding (heavy nose bleed, blood in urine or stool) needs a same-day check.
Falls are the big risk
Fall-proof your home, treat dizziness, and ask about a balance review — the goal is to stay upright.
Cut the triggers
Less alcohol, less caffeine, better sleep, and getting any sleep apnoea treated can reduce how often AF flares.
Stay active
Regular gentle exercise is good for AF, your blood pressure and your heart. Walking is plenty — consistency matters more than intensity.
Important — never stop your blood thinner without telling us Even a few days off can raise your stroke risk significantly. If you need surgery, a dental procedure, or you've had a bleed, ring us — we'll plan a safe pause together. Don't just stop on your own.
Call 000 or get help if:
- Sudden weakness, slurred speech or face droop (stroke signs)
- Severe chest pain or sudden breathlessness
- Heavy bleeding that won't stop
- A bad fall, especially with a head knock
Your next steps:
- Set a daily reminder for your tablet, same time each day
- Carry a card or note saying you're on a blood thinner
- Book a yearly heart check with us
- Bring questions to your next appointment — none are silly
A small daily habit, a much smaller risk
One tablet, taken on time, lowers your stroke risk by more than half. AF doesn't define you — the way you manage it does.
— Dr Regu
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