Lab quiz #4 Flashcards
(50 cards)
EKG or ECC
electrocardiogram
Graphical recording of the electrical current generated in the electrical conductive system of the heart
- quantity and quality of heartbeats
- mechanical activity follows electrical activity
- shows waves of depolarization/repolarization
EKG function
resting membrane is predominantly + on the outside and - on the inside
depolarization
wave of _ is an influx of positive ions making the inner membrane less negative (shift in ions)
depolarization
P wave is the _ in an EKG
depolarization of the atria
QRS complex is the _ in an EKG
depolarization of the ventricles
T wave is the _ in an EKG
repolarization of ventricles
Where is atrial repolarization in an EKG?
Hidden during QRS complex
Step 1 in the electrical system of the heart
Sinoatrial Node (SA node)
Step 2 in the electrical system of the heart
- What happened here?
Atrioventricular Node (AV node)
- pause to allow ventricles to fill
Step 3 in the electrical system of the heart
Left bundle branch
Step 4 in the electrical system of the heart
- What are they called?
- What happens here?
Conduction pathways
- Perkinje
- stimulates heart contractions
How many electrodes and leads (pictures)?
10 electrodes and 12 leads
Electrical signals = _
deflections
- Direction
- speed
- Mass of the tissue
electrical signals
Direction:
Signal is _ electrode
- voltage above isoelectric line ( _ )
towards (+)
Direction:
signal is _ electrode
- voltage is below isoelectric line ( _ )
away from (-)
Speed:
Fast moving signal
sharp spike
Speed:
Slow moving signal
rounded wave
Mass of tissue:
Moving through smaller mass
small wave
Mass of tissue:
Moving through larger mass
large wave
Where do the Limb Leads go? (standard)
Right arm (RA)
Left arm (LA)
Left leg (LL)
Right leg (RL) - grounded
- Bipolar
- sense electric potential between two limbs/points
standard limb lead (leads I, II, & III)
Limb Lead _
- Electrode = LA +
- Electrode = RA -
- Angle of heart = lateral
Lead I
