2Blood PressureBlood pressure (BP) is the pressure or tension exerted on the arterial walls as blood pulsates through them (principal vital sign)Systolic blood pressure (SBP) – pressure exerted on the arteries during the contraction phase of the heartbeat.Diastolic blood pressure (DBP) – the resting pressure on the arteries as the heart relaxes between contractions.
3Diastolic phase: heart relaxes, BP falls, heart fills with blood Systolic phase : heart contracts, BP rises, heart pumps blood out to the body
4120 80 Reporting BP Unit of measurement: Millimeters of mercury (mmHg) “LUB”12080“DUB”
5Classification of BP for Adults Blood Pressure (cont.)Classification of BP for AdultsCategorySystolic (mmHg)Diastolic (mmHg)Hypotension< 90<60NormalandPrehypertensionorStage 1 Hypertension140 – 159OrStage 2 Hypertension≥ 160or ≥ 100
6Blood Pressure (cont.) Sites for Blood Pressure Assessment Brachial artery – taken on the upper arm; most common site.Radial artery – taken on the lower arm; possible site for infants or clients who have very large upper arms.Popliteal artery– taken on the thigh.Dorsalis pedis and posterior tibial – taken on the lower leg.
7Blood Pressure (cont.) Equipment for Measuring Blood Pressure Blood pressure is measured using a sphygmomanometer, also called a BP cuff, or cuff.Sounds like: SFIG-moh-mə-NOM-i-ter
8Blood Pressure (cont.) Equipment for Measuring Blood Pressure Mercury Types of SphygmomanometersMercury – has a calibrated glass tube containing mercury.Aneroid – has a calibrated dial with a needle that points to numbers on theface of the dial.Electronic – uses a digital display and usually includes the pulse rate.MercuryAneroidDigital
9Homework: What factors affect HR & BP? Heart RateBlood Pressure
10Scientific Investigation Inquiry Question:Variables:Independent Variable: What will be manipulated?Dependent Variable: What will be affected?Control: What will we compare our results to?OR What will remain constant?