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Why is it not possible to obtain diastolic blood pressure using the palpatory method?
Wiki User
∙ 15y ago
The palpatory method of obtaining a blood pressure is when the person taking the blood pressure feels the radial pulse (in the wrist) while pumping up the blood pressure cuff. When the radial pulse disappears, this is the systolic blood pressure.
The systolic blood pressure is the pressure exerted in the arteries when the heart has contracted and is forcing the blood through the arteries - it therefore gives the reading for the maximum blood pressure. When we feel a pulse, we are feeling the blood being forced through the arteries (meaning we only feel the pulse at the maximum pressure which is the same as the systolic blood pressure, allowing us to get a systolic blood pressure from feeling the pulse).
The diastolic blood pressure is the pressure in the arteries when the heart is relaxed, or the minimum amount of pressure. Because the pressure is lower at this stage, it is not possible to feel the pulse and therefore it is not possible to obtain a diastolic reading using the palpatory method, a stethoscope is required to be able to hear the blood flow rather than feel it.
Wiki User
∙ 15y ago
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How and where is low blood pressure detected?
Blood pressure can be measured by means of an invasive and non-invasive method. The invasive method requires the insertion of an arterial catheter that measures blood pressure real time. The radial artery is most often used but other arteries can suffice.The non-invasive method would entail the use of a sphygmomanometer and stethoscope. We listen for "Korotkoff's Sound". The beginning of the sound marks the systolic pressure while the end of the sound marks the diastolic pressure. The brachial artery is most often used but in some instances the popliteal artery can also be used.
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The sphygmomanometer ,commonly called a blood pressure cuff ,is an instrument used to obtain blood pressure readings by the ausculatory method. It consists of an inflatable cuff with an attached pressure gauge .The cuff is placed around the arm and inflated to a pressure higher than systolic pressure(which occurs during pumping of the blood from the heart) to occlude circulation to the forearm .As cuff pressure is gradually released .The examiner listens with a stethoscope for characteristic sounds called the sounds of Korotkoff ,which indicate the resumption of blood flow into the forearm .The pressure at which the first soft tapping sounds can be detected is recorded as the systolic pressure .As the pressure is reduced further blood flow becomes more turbulent , and the sounds become louder .As the pressure is reduced still further , below the diastolic pressure, the artery is no longer compressed ; and blood flows freely and without turbulence.At this point ,the sounds of Korotkoff can no longer be detected .The pressure at which the sounds disappear is recorded as the diastolic pressure. done by dr.SmSm (dental student)
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