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 clot interrupts blood flow and causes a stroke. Two types of thrombosis can cause a stroke: large vessel thrombosis and small vessel disease (or lacunar infarction.) Large Vessel Thrombosis: This is the most common type of thrombotic stroke. It is caused by a combination of long-term atherosclerosis (hardening of the arteries) followed by rapid blood clot formation.