Some people taking blood-thinning medications might be getting the wrong dose, according to a new study.

For those with atrial fibrillation, warfarin helps reduce stroke and heart attack risk. While some have questioned the safety of its use with kidney patients, the medication appears to improve outcomes.

If your kidneys are not working properly, you may need to go on dialysis. Both poor kidney function and dialysis have been linked to an offbeat heart rhythm - a problem that seems to be strong in older dialysis patients.