i am a patient of bpd and under lithosun, lamitor,qutipin,lonazep and bupron for many many, about 20 years. due to tremors in one of the hands,the doctor had advised to take betacap tr40 and is also being continued for last 8 years.suddenly the pulse has gone down to about 23. and in fact there was a pause of 4.5 seconds on the ecg. my question is 1) whether sudden lowering of pulse is because of continued use of betacap tr 40 as the consulting doctor is suspecting.? 2) what could be the other possible reasons?