<prompt> Bheka isigaba esingezansi bese uphendula umbuzo emva kwalokho ngolimi olufanayo nesigaba: Ukudlula: Kubantu abaneminyaka engu-18 nangaphezulu, umfutho wegazi ophakeme uchazwa njengokukala umfutho wegazi we- systolic noma we- diastolic ophakeme ngokungaguquguquki kunenani elijwayelekile elamukelekayo lokhu kungaphezu kuka-129 noma u-139 mmHg we- systolic, u-89 mmHg we- diastolic ngokuya ngomhlahlandlela. Kusetshenziswa amanye amagugu 135 mmHg systolic noma 85 mmHg diastolic uma izilinganiso zithathwe ekuqapheni kwamahora angu-24 noma ekhaya. Iziqondiso zakamuva zomhlaba wonke zomfutho wegazi ophakeme nazo zenze izigaba ezingaphansi kwebanga lomfutho wegazi ophakeme ukukhombisa ukuqhubeka kwengozi ngomfutho wegazi ophakeme ebangeni elijwayelekile. Umbiko Wesikhombisa we-Joint National Committee on Prevention, Detection, Evaluation and Treatment of High Blood Pressure JNC7 oshicilelwe ngo-2003 usebenzisa igama elithi prehypertension ekucindezelweni kwegazi ebangeni le-120139 mmHg systolic noma i-8089 mmHg diastolic, kuyilapho i-European Society of Hypertension Guidelines 2007 ne-British Hypertension Society BHS IV 2004 isebenzisa izigaba ezinhle kakhulu, ezijwayelekile nezijwayelekile ezijwayelekile ukuhlukanisa izingcindezi ezingaphansi kwe-140 mmHg systolic kanye ne-90 mmHg diastolic. Umfutho wegazi ophakeme nawo uhlukaniswa ngokwezigaba: I-JNC7 ihlukanisa phakathi kwesigaba sokuqala somfutho wegazi ophakeme, isigaba sesibili somfutho wegazi ophakeme, kanye nomfutho wegazi ophakeme we-systolic. Umfutho wegazi ophakeme we-systolic ohlukanisiwe ubhekisela kumfutho wegazi ophakeme we-systolic onomfutho wegazi ojwayelekile we-diastolic futhi ujwayelekile kubantu asebekhulile. Iziqondiso ze-ESH-ESC 2007 ne-BHS IV 2004 zibuye zichaze isigaba sesithathu isigaba III sokuphakama komfutho wegazi kubantu abanomfutho wegazi we-systolic ongaphezu kuka-179 mmHg noma umfutho wegazi we-diastolic ongaphezu kuka-109 mmHg. Umfutho wegazi ophakeme uhlukaniswa ngokuthi umelana uma imithi inganciphisi umfutho wegazi uye ezingeni elijwayelekile. NgoNovemba 2017, i-American Heart Association kanye ne-American College of Cardiology bashicilela umhlahlandlela ohlanganyelwe ovuselela izincomo zombiko we-JNC7. Umbuzo: Yisiphi isigaba sesithathu sokuphakama komfutho wegazi?  <response>: okudlula u-179 mmHg noma umfutho we-diastolic ongaphezu kuka-109 mmHg 