lab 13 Flashcards
detects the feel of the pulsation of blood in an available artery and determines the point at which the pulsation stops when the pressure is applied
indirect method
the applied pressure balances the pressure in the artery when the vessel collapses so
blood no longer flows
uses sound to accomplish the same purpose
auscultatory method
blood rushing through vessel makes sound
auscultation
the blood rushing through vessel makes a reaily identified sound and that sound is called/ the method relies on the detectionof sound
korotkoff sounds
indirect methods
palpation, stethoscope, microphone
how many pressures are needed to be detect
2
the pressure exerted by the contraction of the heart and the resulting pressure transmitted to the arteries
systolic pressure
the lowest pressure in the artery when the heart is at rest and the runoff and resilience of the artery maintains flow in the system just before the heart contracts again
diastolic pressure
difference between systolic and diastolic
pulse pressure
measurement of pressure
millimeters of mercury mm Hg
the meaning of Hg
the venous pressure is sometimes in mm of water
palpation method can only be detected by which pressure?
systolic
is palpation accurate?
not so much, method of last resort
what is felt first after putting the bp cuff?
radial pulse
in auscultatory method what pulse is first detected
brachial artery at the bend elbow
what sound should be detected?
thumbing, a sudden decrease in sound intensity, disappearance of sound
first sound
systolic pressure
second sound
diastolic
third sound
blood flows unimpeded through the artery
lay hand on the back and raise hand slowly while observing the veins on the back of hand
venous system
SA node sends electrical impulses to
AV node
AV node sends AP to
the entire muscle that causes contraction
person who formulated the mathematics of visualizing a source of electrical current and used the triangle method
einthoven’s triangle
Lead I
right and left arm ( left arm is+)
Lead II
right arm and left left (ll +)
Lead III
left arm and left leg (ll +)
Triangle is made by counting the leads
counter clockwise
values plotted for each lead
R-(Q+S)
ventricular depolarization
QRS complex
AV nodal delay
PR segment
atrial depolarization
P-wave
ventricular repolarization
T-wave
ventricular contraction
ST segment
the length of the arrow is the
electrical voltage
the direction is the
axis of the heart
represents the electrical activity and also indicates the tilt of the heart in the chest
true
exercise or heart disease
enlarge the left ventricle so axis shifts
designed to determine electrical events in a transverse plane
six chest leads
always ground
RL
