Final answer:
Hypertensive emergency is a sudden increase in either or both systolic or diastolic blood pressure with evidence of end-organ damage.
Step-by-step explanation:
Sudden increase in either or both systolic or diastolic blood pressure with evidence of end-organ damage is known as Hypertensive emergency. Hypertensive emergencies are situations in which there is a rapid and severe increase in blood pressure, usually causing acute target organ damage. This can include symptoms such as severe headache, shortness of breath, chest pain, or neurological deficits.