A + P Cardiorespiratory Lab Flashcards Preview

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Flashcards in A + P Cardiorespiratory Lab Deck (15)
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1
Q

how does electrical current flow between the electrodes dictate the recorded ECG deflections shown in the wave form

A

when depolarization flows toward a + electrode within a “recording lead” you should see a positive (upward) deflection on the ECG paper (leads I, II, and III)
when depolarization flows toward a - electrode you should see a negative (downward) deflection (aVR or aVL)

2
Q

what does the P-R interval represent

A

conduction through the AV node

3
Q

how long should the P-R interval be?

what if it is too short or too long?

A

normal: 120-200 ms
too long: probable first degree heart block
too short: possible pre-excitation (presence of an accessory pathway between the atria and ventricles) or AV nodal (junctional rhythm)

4
Q

what does the QRS interval represent

A

indicates the origin of each QRS complex (e.g. sinus, atrial, or ventricular)

5
Q

normal QRS
short
long

A

normal: 70-100 ms

short (100 ms): ventricular origin or bundle branch block

6
Q

what does the S-T segment represent

indications if it is above or below the “baseline” of the ECG waveform

A

the interval between ventricular depolarization and repolarization
indications
-myocardial ischemia/infarction

7
Q

what does QT represent

A

time taken for both ventricular depolarization and repolarization

8
Q

normal QT interval
long
short

A

350-450 ms (normal usually less than 1/2 the RR interval)

long: increased risk of ventricular arrhythmia or myocardial infarction
short: increased risk of paroxysmal atrial and ventricular fibrillation or sudden cardiac

9
Q

SBP

  • represents
  • normal values
A

represents the pressure exerted by blood against the arterial walls during systole (ventricular contraction)
normal is 115-120 mmHg

10
Q

DBP

  • represents
  • normal values
A

represents the pressure exerted by blood against the arterial walls during diastole (ventricular relaxation)
normal is 75-80 mmHg

11
Q

what can a high SBP and DBP indicate

A

the vessels have become hardened and/or occluded by plaque buildup (atherosclerosis) and cannot respond to fluctuation in pressure incurred during heart contractions

12
Q

results of high and low FVS

A
less
-could have small lungs for stature, 
-really deconditioned
-smoker
-might have a restrictive lung disease
greater
-big lungs for stature
-good cardiovascular shape
-play a wind instrument
13
Q

results of high and low FEV1.0

A

less
-means you could have an obstructive lung disease
greater - could be in great shape to play a wind instrument

14
Q

obstructive lung disease effect on FVC, FEV1.0, and FEV1.0/FVC

A
FVC
-no or little change
FEV1.0
-reduced score
FEV1.0/FVC - reduced score
15
Q

restrictive lung disease effect on FVC, FEV1.0, and FEV1.0/FVC

A

FVC: reduces score
FEV1.0: reduced score
FEV1.0/C - no or little change