User:Mr. Ibrahem/First-degree atrioventricular block

First-degree atrioventricular block (first degree AV block) is were the electrical signal from the upper to lower chambers of the heart is delayed but not interrupted. It generally results in no symptoms. Rarely there may be shortness of breath, tiredness, and lightheadedness. Complications may include atrial fibrillation or progress to second- or third-degree AV block.

It occur occur normally in younger people and athletes. Other causes include a heart attack, myocarditis, high blood potassium, and certain medications such as beta blockers, calcium channel blockers, and digoxin. Diagnosis is by an electrocardiogram (ECG) showing a PR interval of greater than 200 milliseconds without any dropped beats. The condition is considered "marked" is greater than 300 milliseconds. It is a type of atrioventricular block.

No specific treatment is generally required. Medications that can worsen the condition may be stopped. Rarely in those with marked disease and symptoms a pacemaker may be placed. In young people brief episodes of first degree AV block and common though ongoing issues affects less than 1%. In becomes more common with age affecting about 5% of people over the age of 50. Males are more commonly affected than females.