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.
Maternal chorioamnionitis or other secondary infectious complications may cause thrombosis of pelvic vessels and the potential for pulmonary emboli. Serious complications, including septic shock, pulmonary hypertension, respiratory failure, and meningitis, occur in early onset bacterial infections of the neonate.