ࡱ> q` {BbjbjqPqP :l::I:1,,,8-48-lI--"---../'/ 7777=8DU@DH$Jh@MH3/..3/3/H--H3333/ --733/733Z66-- )I],?0r67H0Iz6M31&M66M6(3/3/33/3/3/3/3/HHY3d3/3/3/I3/3/3/3/&(,(, Austin Community College Indirect Measurement of Arterial Blood Pressure Cardiovascular Index, Mammalian Diving Reflex PART I Introduction: BLOOD PRESSURE (BP) is defined as the "pushing force exerted by the blood against the vessel walls". This pressure is highest in the arteries and lowest in the veins. As a result, the blood moves from the arteries through the organs into the veins and back into the heart to begin the cycle over again. The heart acts as a pump to create the high arterial pressures that keep the blood flowing. Because it is the "driving pressure" that pushes the blood through the organs, the ARTERIAL BLOOD PRESSURE is of utmost importance and is usually the pressure that is measured by physicians. It is critical that this pressure remain relatively stable. If it is chronically too low, insufficient blood will be pushed through organs and the cells will receive an inadequate supply of oxygen and nutrients. On the other hand, a chronically elevated arterial blood pressure (HYPERTENSION) can damage the blood vessels by rupturing them or force the blood through the capillaries too fast for sufficient exchange of nutrients and wastes. High arterial pressure also puts an added strain on the heart because it must overcome the pressure in the arteries before it can force new blood into the system. The blood pressure in the arteries rises and falls with the phases of the heart beat. The highest pressure in the arteries, produced as a result of ventricular contraction is known as the SYSTOLIC BLOOD PRESSURE. The lowest pressure in the arteries, produced as a result of ventricular relaxation is known as the DIASTOLIC BLOOD PRESSURE. The difference between the systolic and the diastolic pressure is known as the PULSE PRESSURE. The average effective arterial pressure forcing blood through the organs is known as the MEAN ARTERIAL BLOOD PRESSURE. This is determined by adding one-third of the pulse pressure to the diastolic pressure. The blood pressure in the arteries may be measured either directly or indirectly. In the DIRECT METHOD, a fluid-filled cannula is inserted into an artery and the direct, head-on pressure of the blood is measured with a pressure transducer. In the INDIRECT METHOD, no contact is made with the blood. Instead, pressure is applied externally to an artery occluding it and stopping blood flow. Then the blood pressure is determined by listening to various arterial sounds (KOROTKOFF SOUNDS) that result when the external pressure is reduced and the blood begins to flow again. This is called the AUSCULTATORY METHOD since the detection of sound is called "auscultation". An older, less accurate, indirect measure of arterial blood pressure is the PALPATORY METHOD in which one simply palpates or feels the pulse as the pressure applied externally to an artery is reduced. In the every day practice of medicine a combination of the palpatory and auscultatory methods is used. For obvious reasons, human blood pressure is very rarely measured directly. Fortunately, while indirect measurements of arterial blood pressure are less accurate than direct measurements, they come close enough to be clinically useful. In both indirect methods pressure is applied externally to an artery using an instrument called a SPHYGMOMANOMETER. It consists of an inflatable rubber bag (cuff), a rubber bulb for introducing air into the cuff, and a mercury or aneroid manometer for measuring the pressure in the cuff. The physiograph (IWORX System) and a special transducer known as an electrosphygmograph can also be used. Human blood pressure is most commonly measured in the BRACHIAL ARTERY of the upper arm. In addition to being a convenient position for taking measurements, it has the added advantage of being at approximately the same level as the heart so that pressures obtained closely approximate the pressures in the aorta leaving the heart. This allows the blood pressure to be correlated with heart activity. Procedure: 1. Palpatory Method Seat the subject comfortably with his RIGHT ARM resting on the laboratory table. Wrap the pressure cuff snugly around the bare arm above the elbow, making certain that the inflatable bag within the cuff is placed over the inside of the arm where it can exert pressure on the brachial artery. Keep the cloth strap flat so as to furnish a firm and even external support for the bag when it is blown up. Secure the end by tucking it under the preceding turn or fastening the velcro connectors. Have the cuff fairly snug when deflated, but loose enough to avoid all possibility of interfering with the venous return from the forearm. Close the valve on the bulb by turning it clockwise. The diagram below shows the proper placement of the pressure cuff.  With one hand, palpate (feel) the radial pulse in the wrist. Slowly inflate the cuff by pumping the bulb with the other hand, and note the pressure reading when the radial pulse is first lost. Then increase the pressure 30 mm Hg above this point. Slowly reduce the pressure in the cuff (2-3 mm Hg/heartbeat) by turning the valve counterclockwise slightly to let air out of the bag. Note the pressure when the radial pulse first reappears - this is the systolic blood pressure. Let all the air out of the cuff. Do not leave the cuff inflated for over two minutes, as it is uncomfortable and will cause a sustained increase in blood pressure. The systolic pressure recorded by the palpatory method is usually around 5 mm Hg lower than that obtained using the auscultatory method. A major disadvantage of this method is that it cannot readily be used to measure diastolic pressure. Direct Palpation: ______________________ 2. Ausculatatory Method To measure the blood pressure by the auscultatory method, apply the deflated cuff around the bare right arm just above the elbow as before. Then inflate the cuff to a pressure about 30 mm Hg above the suspected systolic pressure (The suspected systolic pressure can be determined by palpating the radial pulse while inflating the cuff). As the cuff is inflated, the brachial artery will be occluded and blood flow will stop. Place the bell of a STETHOSCOPE over the brachial artery at the level of the elbow distal to the cuff. (See Figure 1). Slowly reduce the pressure in the cuff (2-3 mm Hg/ Heartbeat). As the pressure drops below systolic pressure the vessel will begin to open up, blood will begin to spurt through the brachial artery causing turbulent flow with a sudden expansion and collapse of the arterial wall with each beat. These two factors, along with others, combine to produce sharp tapping sounds known as KOROTKOFF SOUNDS which are easily heard with the stethoscope. When the cuff pressure is near diastolic, the arterial flow is less turbulent and the sounds become muffled and faint. When the cuff pressure is further reduced, the sounds disappear entirely. The nature of these sounds which were first described by KOROTKOFF in 1905 is described more completely below: Phase 1 - The initial appearance of clear high-pitched sounds which increase in intensity during the next 10 mm Hg of pressure drop. The pressure when these sounds first appear is the systolic pressure. Phase 2 - The sounds decrease in pitch during the next 10-15 mm Hg drop in pressure. Phase 3 - The sounds become deeper and louder again and have a sharper thudding quality during the next 10-15 mm Hg drop in pressure. Phase 4 - The sound suddenly becomes muffled and distant. The pressure at this point is termed the diastolic pressure. This muffled sound continues for another 5 mm Hg pressure drop, after which all sound disappears. The point at which the sound ceases completely is called the end-diastolic pressure. It is sometimes recorded along with the systolic and diastolic pressure in this manner: 120/80-75 mm Hg Phase 5 - Silence 3. Your instructor will demonstrate the indirect measurement of arterial blood pressure. 4. Before proceeding make several blood pressure determinations on a willing subject using the sphygmomanometer. Practice until you can obtain accurate, consistent readings. Compare the systolic pressure measurements determined by the palpatory and asucultatory methods. Blood Pressure Palpatory Method __________________ Blood Pressure Auscultatory Method: _______________ 5. Using the sphygmomanometer do each of the following experiments, record the data in the spaces provided and explain the results. a. Postural Effects on Blood Pressure Determine the blood pressure (systolic and diastolic) and the pulse rate after your subject has rested quietly for several minutes in a supine (lying down) position. Do this several times until constant values are obtained. Trial 1 Trial 2 Supine BP Pulse Rate Determine the blood pressure (systolic and diastolic) and the pulse rate again immediately after your subject changes from the supine to the stand-up position. Repeat as necessary. Trial 1 Trial 2 Stand-up BP Pulse Rate Note the effects of postural change on blood pressure and explain: b. Isometric Exercise and Blood Pressure Record a baseline blood pressure and pulse rate while the subject is in a standing position. Standing BP (resting) Pulse Rate (resting) Have the subject arm curl a heavy barbell four times. After the fourth curl, quickly measure the blood pressure and pulse rate while the barbell is in the "up" position (Note: it helps if the subject does a Valsalva Maneuver - exhales against a closed glottis - while the blood pressure is being recorded). Standing BP (during a curl) Pulse Rate (during a curl) What happens to the blood pressure and pulse rate during the curl? Explain why this response occurs: Part II 1. Activity and Blood Pressure Record a baseline blood pressure and pulse rate while the subject is in a standing position. Standing BP (resting) Pulse Rate (resting) Disconnect the manometer form the sphygmomanometer cuff and have the subject walk up and down several flights of stairs or use the step provided and step up and down for for two minutes. When the subject returns quickly connect the manometer to the cuff again and record the blood pressure before the subject has a chance to recover. Standing BP (exercise) Pulse Rate (exercise) What happens to the blood pressure during vigorous exercise? Explain: 2. Systolic Blood Pressure Ratio (optional if time permits) *The 3-min systolic blood pressure ratio is a useful and readily obtainable measure that can be applied in all patients who are undergoing exercise testing for the evaluation of known or suspected ischemic heart disease . The ratio is calculated by dividing the systolic blood pressure 3 min into the recovery phase of a treadmill exercise test by the systolic blood pressure at peak exercise. A 3-min systolic blood pressure ratio greater than 0.90 is considered abnormal. Higher values for the ratio are associated with more extensive coronary artery disease, as well as an adverse prognosis after myocardial infarction. Systolic Blood Pressure Ratio: _____________________________ 3. Ausculatation A. While the stethoscopes are available, listen to the heart sounds that are described in your lecture notes. Recall that the FIRST HEART SOUND (the lub) is produced at the onset of ventricular systole when the AV valves close. The SECOND HEART SOUND (the dub) is produced at the onset of diastole when the aortic and pulmonary semi-lunar valves close. B. The diagram below shows the AUSCULTATORY AREAS on the chest where the sounds from each valve can be heard most clearly. Note that the valvular sounds are not loudest directly over their anatomic locations. Move the stethoscope around on the chest and listen for changes in sound intensity and duration.  What is a murmur? Did you hear any? 4. Harvard Step Test (instructor will direct this exercise) INTRODUCTION The Harvard Step Test was developed in the Harvard Fatigue Laboratory in World War II to screen men for physical fitness and to evaluate the progress of physical training programs. The Harvard Step Test measures general endurance or physical condition. The test consists of having the subject step up and down on a bench 20" high ( 16" for women) for 5 minutes, if possible and then measuring heart rate recovery during a post-exercise period. Subjects should stop if they feel that they cannot continue1. This exercise should only be done by those individuals who are in very good physical health. PROCEDURE 1. The subject stands in front of a bench of appropriate height. An observer stands behind the subject. The subject steps up and down on the bench at a rate of 30 steps (all the way up and down constitutes one step) per minute for a maximum of 5 minutes. The observer should watch the subject to insure that the subject keeps pace. If the subject is unable to keep the pace for 15 seconds, the observer should stop the subject. The observer should also watch the subject to prevent accidental falls. 2. When the subject stops at the end of 5 minutes or sooner if the subject cannot keep pace, the subject should relax while the observer gets ready to take the subject's pulse. The duration of the exercise should also be noted. 3. One minute after finishing the test take your pulse rate (bpm)- Pulse 1 Two minutes after finishing the test take your pulse rate (bpm) - Pulse 2 Three minutes after finishing the test take your pulse rate (bpm) - Pulse 3 Use the calculator below to determine your level of fitness 4. The physical fitness index is computed from the following formula: Index = duration of the exercise in seconds x 100 --------------------------------------------------- 2 (sum of the 3 pulse counts in recovery) 5. Interpretation of Scores: below 55: Poor physical condition 55 to 64: Low average 65 to 79: High average 80 to 90: Good Above 90: Excellent 6. Record your results. 1The Harvard Step Test can be modified to equalize the work for persons of different height. 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