Informe
Lección Blood Pressure – Lab
Auscultation – Activity
Estimated systolic blood pressure using palpation
Volunteer's Name Systolic Pressure (mmHg)
Mayte 108
Blood pressure using stethoscope method
Volunteer's Attempt Systolic Pressure Diastolic Pressure
Name (mmHg) (mmHg)
What are some possible sources of error or variation in this technique of blood pressure measurement?
Is the following statement true or false?
Clinically, two careful measurements of blood pressure with a one-minute interval are recommended. A repeat
measurement should be taken when there is any uncertainty.
True
False
Blood pressure and finger pulse – Activity
160 Blood Pressure (mmHg)
140
120
100
80
0.15 Finger Pulse (mV)
0.1
0.05
0
-0.05
-0.1
-0.15
0.3 Finger Pulse Amplitude (mV)
0.25
0.2
0.15
0.1
Tiempo
0.05
0
10 12 14 16 18 20
Blood pressure and finger pulse – Analysis
Pulse Detection Method Estimated Systolic Pressure (mmHg)
Arm at heart level 146
Arm above head 104.7
From your finger pulse recording, is there any way to determine diastolic pressure? Could a finger pulse measurement
ever replace the stethoscope in determining diastolic pressure?
What happened to the finger pulse amplitude when the arm is held above the head? What happened to the estimated
systolic pressure? What do you think could account for this observation?
Cardio microphone – Challenge
The Korotkoff sounds will appear as spikes on the Cardio Microphone channel, as shown in the image below (orange
signal). The upper channel (dark blue signal) shows the corresponding pressure in the cuff as it is deflated.
Label the diagram below with the appropriate terms.
Auscultatory gap
Diastolic pressure
Diastolic pressure
Systolic pressure
Systolic pressure
Auscultatory gap
Cardio microphone – Activity
160 Blood Pressure (mmHg)
140
120
100
80
0.4 Cardio Microphone (mV)
0.2
-0.2
-0.4
-0.6
15 20 25 30 35 40
Cardio microphone – Analysis
Using the cardio microphone to determine systolic and diastolic pressure:
Rate of pressure change Systolic Pressure (mmHg) Diastolic Pressure (mmHg)
Slow 124 81.9
Medium
Fast
What is the basis for the sounds referred to as Korotkoff sounds?
Laminar blood flow
Maximal blood flow
Turbulent blood flow
How did deflating the cuff more quickly alter your blood pressure measurements? Can you explain why?
Cuff size – Activity
Blood Pressure
Cardio Microphone
Cuff size – Analysis
Effect of cuff size on measured blood pressure
Cuff Size Systolic Pressure Diastolic Pressure
(mmHg) (mmHg)
Infant
Child
Adult
Leg
What can you conclude about the effect of cuff size on measured blood pressure? How can you explain this?
Arm position – Challenge
Select Annotate and draw an arrow below each figure to show how the measured blood pressure at the elbow will
differ with the arm in the different positions shown. Hint: the pressure in a column of fluid depends on height.
Arm position – Activity
80
160 Blood Pressure (mmHg)
140
120
100
80
60
40
20
0
100
20 Cardio Microphone (mV)
80
60
40
20
0
-20
-40
-60
-80
-100
-120
1:40 1:45 1:50 1:55 2:00 2:05
Arm position – Analysis
Effects of arm position on blood pressure
Enter "not detectable" where you cannot make a reading.
Measurement Site Position Systolic Pressure (mmHg) Diastolic Pressure (mmHg)
Elbow Arm at heart level 112 79.1
Elbow Arm hanging loosely by side 110 60.7
Elbow Arm at head level 124 72.9
Given the variation in pressure with height, blood pressure is normally referenced to heart level. Does this usually
affect the pressure recorded from the upper arm?
You may have experienced difficulty in obtaining a blood pressure measurement when the arm was held above the
head. Can you give a physiological explanation for this? Tip: Why do you think you experience fatigue when holding
something above your head?
Leg blood pressure – Activity
Blood Pressure
Cardio Microphone
Height difference from heart to blood pressure cuff
Cuff Position Cuff-to-Heart Height Difference (cm)
Thigh
Calf
Leg blood pressure – Analysis
Height difference from heart to blood pressure cuff.
Position Thigh Lying Thigh Standing Calf Lying Calf Standing
Cuff-to-heart height difference (cm) 0 0
Systolic pressure (mmHg)
Diastolic pressure (mmHg)
Extra hydrostatic pressure (mmHg) 0 0
Corrected systolic pressure (mmHg)
Corrected diastolic pressure (mmHg)
How did the blood pressure in the leg compare with that in the volunteer's arm? Explain your observations. From
these findings, what is the correct posture to measure blood pressure in any artery in the lower limb?
How do your corrected standing leg blood pressures compare with your lying leg blood pressures? When might this
method be useful for blood pressure estimation?
Ventana emergente - Notebook
Reflection notebook:
Ventana emergente - Hydrostatic pressure (table)
Enter the height difference from heart level in centimeters into the table:
Height Difference from Heart Level (cm) Hydrostatic Pressure (mmHg)
