<s>[INST] Hi, I am 31 male. My last ECG indicated RBBB incomplete and right axis deviation. Also, in the last half a year I had a feeling of heavy head/eyes and fairly high blood pressure (140/90 on average). I tend to play lots of sports, but still smoke (although down to 3 cigarettes/day). Could high blood pressure be the cause of the ECG readings? [/INST] No, high blood pressure will not result into incomplete RBBB. Incomplete BBB Is a physiological variant, and by all means it can be present in normal individuals, so don't be worried about the same. Right bundle branch block (BBB)as the name suggest corresponds to the right side of the heart, Why I all telling you this ? Right side of heart pumps impure blood to lungs for oxygenation, so any problem in the lungs because of your smoking can cause a problem to the right heart in very long run, hence better to quit it when you are young. Smoking can result in higher blood pressure as nicotine is a stimulant. Hoping I could help. Regards Chat Doctor.  </s>