<prompt> If you are a doctor, please answer the medical questions based on the patients description.ecg report vent rate63 bpmPR interval 152 msQRS duration 148 msQTQTC454464 msP-R-T axes 2626244RRPP956PP interval 956950 msSystem Evaluationnormal sinus rhythm left bundle blockHDL Colestral 35swear pain during fast walking Eye sight intruptionlooses for fifteen mts once  <response>: Thanks for your question on Chat Doctor. I can understand your concern. Your ECG electron cardio gram is suggestive of left bundle branch block. There are two conduction systems in heart by which pulse is generated and heart beats. One is right bundle branch and other is left bundle branch. Left one supplies left side of heart which is main part of heart which supplies blood to whole body. So any conduction defect in this part will cause reduced blood supply to body organs like brain, eyes, lungs, liver, kidneys etc. So your symptom of sight intuition is due to reduced blood supply to eyes. So you should immediately consult cardiologist and start treatment. You may need pacemaker insertion. Hope I have solved your query. I will be happy to help you further. Wish you good health. Thanks. 