The bloodshot appearance is due to the irritation and dilation of the surface blood vessel in the eye. Other symptoms can accompany the red appearance, like itching, soreness, discharge and even blurred vision. These symptoms could indicate a more serious problem.
The list of possible medications or substances mentioned in sources as possibe causes of Heart block includes: 1  Beta-adrenergic blockers. 2  Digitalis. 3  Flecainide. Flecatab. 4  Flumadine. Quinidine. 5  Rimantidine. Tambocor.
What causes heart block? Heart block can be caused by: Scarring (fibrosis) of the heart's electrical system caused by aging. This is the most common cause of heart block. Heart attacks. Infection of the heart valves (endocarditis). Complication of Lyme disease. Sarcoidosis or hemochromatosis.