AAPLAB EXAM 3 Flashcards
P wave
depolarization of SA node
QRS complex
Ventricular depolarization
Atrial repolarization happens when?
during QRS complex
T wave
ventricular repolarization
P-R interval
AV node delay
takes .12 - .20 seconds
what is happening during T– P wave?
nothing, the heart is relaxed, in diastole
how much is each square on a EKG?
.2 seconds
how to calculate heart rate?
60 seconds / beats per sec
Tachycardia
faster than normal heart rate(HR)
Bradycardia
slower than normal heart rate(HR)
Elongated P–R interval = ?
Heart Block, longer than .2 seconds
how is BP expressed
mm Hg (millimeters of mercury)
Systole
contraction of heart
Diastole
relaxation of heart
Where is Systemic BP taken
Brachial Artery
Pulse Pressure (PR)
difference between systole/diastole
Mean Arterial Pressure (MAP)
systole + diastole + diastole / 3
Obstructive disease
can breathe in but hard to exhale
have above normal readings
Restrictive disease
difficulty with breathing in
lung scarring causing lungs to not be able to stretch
below normal readings
AVR
Alveolar ventilation rate = TV x RV
(normal air exchange) X ( air left in lungs)
TV
Tidal Volume = air that moves in/out with each breathe
Lung volume
individual measurement
IRV
Inspiratory reserve volume = Amount of air you can breathe in beyond TV
ERV
Expiratory reserve volume = Additional air you breathe out after TV
RV
Residual volume = air left in lungs after full exhalation
FRC
Functional residual capacity (amount of air in lungs after breathing out) = RV + ERV
VC
Vital capacity (total amount of exchangeable air)= IRV + TV + ERV
TLC
Total lung capacity (sum of all lung volume) = VC + RV
increase in TLC, FRC, RV =
obstructive disease
reduction in VC, TLC, FRC, RV =
restrictive disease
