Blood pressure
From Memory Alpha, the free Star Trek reference.
Blood pressure (also called arterial pressure, or abbreviated as BP) refers to the pressure exerted by circulating blood on the walls of blood vessels, and constituted one of the principal vital signs of life.
Blood pressure that was "practically nonexistent" was considered "perfectly normal" for a Vulcan. (TOS: "The Naked Time")
Under certain conditions, people were known to alter their blood pressure, lower their body temperature, and manifest tumors as a result of psychological stimuli. Julian Bashir, being genetically enhanced, can control his vital signs, including his blood pressure. (DS9: "Things Past", "Extreme Measures")
When Miles O'Brien was infected by harvesters, the initial signs of his infection were low blood pressure and a fever. (DS9: "Armageddon Game")
Kes's pulse and blood pressure increased to dangerously high levels as she was experiencing elogium. (VOY: "Elogium")
In 2371, Vedek Bareil's arterial pressure fell rapidly after he underwent cardiac arrest. (DS9: "Life Support")
