Respected, My father is  55 year old. In 2007/8 he got his gall bladder removed and in 2013 (around) he got two blockages in heart vessels and therefore two stunts were installed to normalise the condition.. Now, my family is planning to visit a hill town (altitude of about 2500 metres) in December where it might snow too. He is fearing to go because of cold weather and mainly thinks that his heart vessels might contract.. So, please tell me should he go or not.. He didn't had any heart related issue since that surgery and not their is any Bp issue..