| In addition, the bronchoscope cannot pass areas of stenosis or occlusion, prohibiting evaluation of distal areas. |
| Comparison of warfarin and aspirin for symptomatic intracranial arterial stenosis. |
| Carotid artery stenosis is characterized by atherosclerotic changes, plaquing, ulcerations, and a progressive narrowing of the carotid vessels. |
| Other cardiovascular causes include severe mitral stenosis and pulmonary embolism. |
| Examples of fixed obstruction include tracheal stenosis, foreign body, or neoplasm. |
| If the ultrasound shows stenosis or atheroma, the patient should understand the risks and benefits of the procedure. |
