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 may cause the following symptoms: 1  Chest pressure or pain. 2  Fainting, also known as syncope, or near-syncope. 3  Fatigue. 4  Lightheadedness or dizziness. 5  Palpitations, which can be skipping, fluttering or pounding in the chest. 6  Shortness of breath.