7 years ago I was diagnosed with a fib which apparently led to heart failure. Whilst in hospital I was also found to have tachy/Brady syndrome so had a pacemaker fitted. When released from hospital I felt a lot better but was slightly breathless when walking distances or upstairs. Over the years this has got gradually worse and I was wondering whether it could be the bisoprolol countering the pacemaker and vice versa, I am on 10 mg a day which I take at 6 pm. I do appear to get fitter later in the day when the drug should be wearing off. I wonder if others had experienced the same.