Systolicpressure100Meanarterialpressure80Diastolicpressure60240wu200AortaElasticVenaeMuscularArteriolesCapillariesVenulesMediumandarteriesarteriescavaelargeveinsMean arterial pressure (MAP)
Mean arterial pressure (MAP)
Classification of blood pressure foradultsage 18 years and olderBlood Pressure Classification ChartCategorySystolic (mmHg)Diastolic (mmHg)NormalLowerthan120Lowerthan80Prehypertension120-13980-89HypertensionStage1140-15990-99Stage2160or higher100or higherAdapted from The Seventh Report on the joint National Committee on Prevention,Detection,Evaluation,andTreatmentofHighBloodPressure(NC7),NIHPublicationNo.03-5233,May2003The classification chart is based on adults, aged 18 and older, who arenot taking high blood pressure medicines and who are not acutelyill.Ifsystolicand diastolicmeasurementsfallinto different categories,thehighercategoryshould beused to classifytheperson'sBP status
Classification of blood pressure for adults age 18 years and older The classification chart is based on adults, aged 18 and older, who are not taking high blood pressure medicines and who are not acutely ill. If systolic and diastolic measurements fall into different categories, the higher category should be used to classify the person's BP status
3.Factors affecting arterial blood pressureStroke volumeVentricular ejectionHeart ratePeripheral resistanceElasticvesselsBlood volume
3. Factors affecting arterial blood pressure Stroke volume Heart rate Peripheral resistance Elastic vessels Blood volume Ventricular ejection
Sv + → blood volume in arota + → sP(1)+↓velocity ↑SP ↑ (obviously)↓Blood volume in diastolic period ↑ → DP ↑ (not obviously)HR ↑ → diastolic period ↓ -→(2)+★blood volume inthis stage-→DPVenous return ++DP ↑ (obviously)SV ↓ -→ SP + (not obviously)
Blood volume in diastolic period↑→ DP↑（not obviously） ↓ ↓ velocity ↓ ↓ DP↑(obviously) SV↓→ SP↑（not obviously） ↓ Venous return↓ ↓ blood volume in this stage↑→ DP SV↑ → blood volume in arota ↑ → SP (1) (2) HR↑→ diastolic period ↓→ ↓ ↑ SP↑ (obviously)
Resistance ↑ → velocity in diastolic stage ↓(3)水Velocity in systolic stageblood volume in this stage ↑★DP ↑(obviously)SP ↑ (not obviously)Elasticity↓→ buffer capacity of SP ↓,ability of maintain DP ↓(4)*SP (obviously), DP ↓→ PP ↑(5)Circulating blood volume/ blood container ↓+Circulation mean pressure change
Elasticity↓→ buffer capacity of SP↓, ability of maintain DP↓ DP↑（obviously） ↓ Circulation mean pressure change ↓ Velocity in systolic stage Circulating blood volume / blood container ↓ ↓ ↓ ↓ Resistance↑ → velocity in diastolic stage ↓ SP↑（not obviously） SP↑(obviously), DP↓→ PP↑ (3) (4) (5) blood volume in this stage ↑ ↓