The Joint National Committee on Prevention, Detection, Evaluation and Treatment of High Blood Pressure determines the guidelines for blood pressure, according to the New York Times. In 2013, the Joint National Committee revised its guidelines, loosening some of its treatment recommendations, as Medscape details.
As of 2013, the Joint National Committee raised its threshold for blood pressure treatment in patients 60 and over to a blood pressure reading of 150/90, according to Medscape. The treatment threshold for those under 60 and those with diabetes or chronic kidney disease is 140/90. Previous recommendations called for only thiazide-type diuretics to be used in initial treatment, but the recommended types of medications were amended to include other diuretics, angiotensin-converting enzyme inhibitors, angiotensin receptor blockers and calcium channel blockers.