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.
Heart block - Causes. Causes of heart block. Heart block can have a number of different causes. It can occur if you have another heart condition or if you take certain medications. A person can be born with heart block (congenital) or it can develop over time (acquired). First-degree heart block is common among well-trained athletes.