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.
Oregon has a wide range of temperatures, though the extremes are rare. The highest was recorded on July 29, 1898, in Hermiston, Oregon, and again on August 10, 1898, in [Redmond, Oregon], both east of the Cascades, when the temperature reached 122 Â°F (50 Â°C).