CAS BI 315 Chapter Notes - Chapter 1: Sphygmomanometer, Plethysmograph, Fidgeting
1 Jul 2018
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Lab 1: Introduction to IX-TA and LabScribe 3tm Software
I. Plethysmograph - detects pulses of blood pressure in your finger produced by the
beating of your heart
A. Need warm hands, remove all metal/jewelry and wipe away oils
II. IX-TA is a recording instrument and a stimulator, LabScribe is the display software.
Always turn on IX-TA before LS3
A. Blue channel bars: actively recording, green channel bars: calculated by LS3
III. Fidgeting laughing talking everything causes noise
IV. RQ - purpose of entering marks
A. To identify data collected from different subjects
B. To quickly search for specific data of interest
V. Amplitude= V2-V1 (measured in V)
VI. Period = T2-T1 (measured in sec)
VII. Period → HR
A. (1 beat/period in sec)*60sec/min = 60/period in sec = beats/min
B. 60/(T2-T1)
C. Typical HR ranges btw 55-85 bpm
VIII. Pulsate carotid (neck) or radial (wrist) artery and click event marker when pulse
IX. Periods of plethysmograph and event marker should be similar
X. Why is figure on pg 6 autoscaled?
A. Autoscale locates the highest and lowest points on the graph and fits it to the
screen (biggest amplitude takes up the whole space)
B. Not autoscaled because the graph is still horizontally squished. Would be more
spread out if autoscaled.
XI. Q1.1: Why is HR slower?
A. Diet - healthy diet = slower heart rate
B. More athletic ability = slower bc heart has to work less bc muscles become more
independent from heart and heart has less strain
C. A stimulant, such as caffeine, will increase HR
XII. Q1.2: weaker pulse aka decrease in pulse amplitude caused by?
A. Lower blood pressure
B. Can be caused by eating a less salty diet
XIII. Q1.3: plethysmograph and event marker should record similar HR, why?
A. Both measure bp which causes pulse so should have similar
B. Differences bc plethysmograph more accurate while event marker delay from
feeling pulse, hitting button, and computer interpreting
XIV. Q1.4: compare plethysmograph, event marker, and normal BP measuring
A. plethysmograph and event marker measure BP (mmHg) in small area, more
prone to fluctuations
B. Normal BP shows more absolute changes so more accurate
C. Plethysmograph and event marker record pulse, more accurately the change in
the volume of blood while a blood pressure cuff marks systolic and diastolic
pressures
XV. Know what the pulse graph looks like! (V vs time)
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Lab 1: introduction to ix-ta and labscribe 3tm software. Plethysmograph - detects pulses of blood pressure in your finger produced by the beating of your heart: need warm hands, remove all metal/jewelry and wipe away oils. Ix-ta is a recording instrument and a stimulator, labscribe is the display software. Always turn on ix-ta before ls3: blue channel bars: actively recording, green channel bars: calculated by ls3. Rq - purpose of entering marks: to identify data collected from different subjects, to quickly search for specific data of interest. Period " hr (1 beat/period in sec)*60sec/min = 60/period in sec = beats/min. A: 60/(t2-t1, typical hr ranges btw 55-85 bpm. Pulsate carotid (neck) or radial (wrist) artery and click event marker when pulse. Periods of plethysmograph and event marker should be similar. Q1. 2: weaker pulse aka decrease in pulse amplitude caused by: lower blood pressure, can be caused by eating a less salty diet.
