第6课 血压及心输出量测量技术(国外英文资料).docVIP

第6课 血压及心输出量测量技术 Physiological parameters measurement and instrumentation - blood pressure and cardiac output measurement techniques Liu qian Qianliu@mail.hust.edu.cn Huazhong university of science and technology, the school of life sciences and technology BIoMedical Measurements and Instrumentation (BMI) content Have a blood pressure monitoring Noninvasive blood pressure monitoring Cardiac output measurement Blood vessels classification The blood vessels of the human body are divided into capacity and resistance vessels The capacity of the vessel to the venous system. The vein plays the role of the blood bank in the vascular system, and 60% to 70% of the circulating blood is in the veins. Blood pressure measurement is the pressure on the wall of the tube that occurs in the resistance vessels. Resistance vessels consist of arteries and arterial arteries, which are developed in smooth muscle Blood pressure is one of the most important traditional monitoring indicators of blood flow dynamics. If the blood pressure is too high, then the ventricular ejection is bound to fight the larger vascular resistance, which increases the load on the back of the heart and causes the heart muscle to fatigue. If blood pressure is too low, even if the blood vessels in the tissue can be expanded to satisfy the infusion, the blood flow will not be able to meet the tissues normal metabolic needs. The human body the pressure The normal physiological (coarse line) of body pressure and the range of abnormal physiology (fine line) 0 - 100. 100 200 300 400 - 100. 0 100 200 300 0 - 10 10 20 30 40 kPa cmH 2 O mmHg The aortic pressure Left ventricular pressure Right ventricular pressure Pulmonary artery pressure Central venous pressure Intracranial pressure Intraocular pressure Intrauterine pressure Gastric internal pressure Bladder and ureteral pressure Alveoli and air pressure Unit of physiological pressure In the international standard unit system, the pressure unit is Pa (Pascal) 1 Pa = 1 N/m