My gelding (I am leasing him for 2 years but have the option of purchase) is a 10 year old WB. My vet came out to check on a swollen leg and large edema on his stomach (he's paddocked by himself so he wasn't kicked) and anyhoo checked his heart. It was highly irregular, sometimes 4 to 6 to 8 beats. He also has a very visible jugular pulse, which I've been concerned about, but my vet told me to keep an eye on it to make sure it doesn't travel any higher. My vet took bloods and we'll hear the results tomorrow, ruling out any cardiac diseases.
Anyone have experience with Atrial Fibrillation? What level of competition were you able to achieve safely? I know eventing, polo and racing are out of the question! He doesn't really like jump anyhoo (other issues).