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.
A chance of Thunderstorms in the morning. Mostly cloudy with a chance of Showers. Breezy with Highs in the mid 60s, except in the upper 60s south of Oregon inlet. Northeast Winds 15 to 20 Mph. Chance of rain 50 percent.