Arthroscopy is a surgical procedure orthopaedic surgeons use to visualize, diagnose and treat problems inside a joint.

 

Angiography is a test that uses an injection of a liquid dye to make the arteries easily visible on X-rays.

 

This leaflet is for people who are having or thinking of having a general anaesthetic. Your care may differ from what is described here because it is adapted to meet your individual needs, so it's important to follow your doctor's advice.

Blood pressure (strictly speaking: vascular pressure) refers to the force exerted by circulating blood on the walls of blood vessels, and constitutes one of the principal vital signs. The pressure of the circulating blood decreases as blood moves through arteries, arterioles, capillaries, and veins; the term blood pressure generally refers to arterial pressure, i.e., the pressure in the larger arteries, arteries being the blood vessels which take blood away from the heart. Arterial pressure is most commonly measured via a sphygmomanometer, which uses the height of a column of mercury to reflect the circulating pressure (see Non-invasive measurement). Although many modern vascular pressure devices no longer use mercury, vascular pressure values are still universally reported in millimetres of mercury (mmHg).