Bradycardia can be caused by: 1  Changes in the heart that are the result of aging.  Diseases that damage the heart's electrical system. These include coronary artery disease, heart attack, and infections such as endocarditis and myocarditis.
Portland Weather In May. The highest recorded temperature in May for Portland for the past 70 years was 100 degrees Fahrenheit, most recently measured on May 28, 1983, and the normal high is 67.
Springs are mild with warm days. Average precipitation is 16 inches per year. The two counties have an approx average 265 days of sun and a growing season averaging 100 days a year. The Oregon Coast in spring temperatures range from high 50 s during day to low 40 s at night with a good chance of rain.It can get quite windy so bring your kites and wind breakers. In summer temperatures range from 60-70 s during day to high 50 s at night.he two counties have an approx average 265 days of sun and a growing season averaging 100 days a year. The Oregon Coast in spring temperatures range from high 50 s during day to low 40 s at night with a good chance of rain. It can get quite windy so bring your kites and wind breakers.