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.
Examples include: 1  Damage to the heart from a heart attack. This is the most common cause of acquired heart block. 2  Coronary heart disease, also called coronary artery disease. 3  Myocarditis (MI-o-kar-DI-tis), or inflammation of the heart muscle.  Heart 1  failure. Rheumatic (roo-MAT-ik) fever.