HOW DO pH INDICATORS WORK? pH indicators detect the presence of H+ and OH-. They do this by reacting with H+ and OH-: they are themselves. weak acids and bases. If an indicator is a weak acid and is coloured and its conjugate base has a different. colour, deprotonation causes a colour change.
Have varicose veins, which are a common cause of superficial thrombophlebitis. Have a pacemaker or have a thin, flexible tube (catheter) in a central vein, for treatment of a medical condition, which may irritate the blood vessel wall and decrease blood flow. Are pregnant or have just given birth.
The most common cause of death resulting from a deep vein thrombosis is a pulmonary embolism. A pulmonary embolus occurs when a blood clot, such as from one of the deep veins of the leg, becomes dislodged from the inner wall of the vein and is able to travel, via the bloodstream, up towards the heart.