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HSF II Lab IV

TermDefinition
[Blank] cells are specialized, non-contractile cells which cause the intrinsic stimulation of the heart. Autorhythmic
What is the difference between an electrocardiograph and electrocardiogram? An ECgraph is the machine/instrument used to record elec. changes in the heart, its output (chart recording of all elec. events prior to each heartbeat) is a ECgram
True or False: EKGs give info about the force of contraction of the cardiac muscle False
Aside from the ANS, name one other factor which can cause extrinsic stimulation Hormones
P wave atrial depolarization
P-Q Interval time between beginning of atria contracting and beginning of ventricles
T wave ventricular repolarization
S-T segment ventricular fibers fully depolarized
QRS complex ventricular depolarization
Q-T interval ventricles contracting (beginning of ventricular depolarization to end of ventricular repolarization)
One instance where heart rate >100 is normal in young children
One instance in which a heart rate <60 is normal highly conditioned people like athletes
What would you be concerned for in a patient who has persistent tachycardia? they may develop fibrillation
Fibrillation rapid, uncoordinated heart contractions
Cardiac Cycle the time in seconds for one heartbeat
A lengthened P-Q interval could be indicative of a [blank], which is produced by cardiac damage to the AV node/ AV bundle and reduces the electrical conduction from the atria to the ventricles heart block
Which segment of an EKG would you look at to determine if an individual has a right or left bundle branch block? QRS complex
The relaxation period extends from the end of the (P or T?) wave to the start of the next (P or T?) wave T/P
How do delta T times change as you look between data from subject laying down vs. after exercise? Delta T times decreased after exercise when compared to laying down/resting (due to increase in heart rate)
What, if any, change would you expect to see in Q-T intervals with an increased heart rate? Q-T interval shortening
The average angle/direction of depolarization of the heart is the (Mean Electrical Axis or Mean Electrical Magnitude) Mean Electrical Axis
The average voltage of an action potential going through the heart is the (Mean Electrical Axis/ Mean Electrical Magnitude) Mean Electrical Magnitude
Where does depolarization begin in the heart? SA node
The AV node is unable to create the intrinsic pace of the heart in the absence of the SA node. True or False False
(Lead I or Lead III?) is a horizontal axis of observation, while (Lead I / Lead III?) has an axis of about 120 degrees. Lead I / Lead III
normal mean electrical axis 60
Is an MEA of 35 degrees right- or left-shifted? Left, because less than 60
If an individual had hypertrophy in their right ventricle, you could expect to observe a (right or left?) axis on their EKG tracing. Right
If an individual had a left bundle branch block, you could expect to observe a (right or left?) axis on their EKG tracing. Left
Autorhythmic Cells cause intrinsic stimulation, the heart beats by itself
Intrinsic Stimulation by autorhythmic cells, makes the heart beat by itself
Extrinsic Stimulation heart stimulation by the ANS and hormones
Intrinsic Conduction System initiates action potential that causes cardiac muscle contraction, provides a pathway to conduct to all cardiac muscle fibers
Electrocardiograph used to record the electrical charges of the heart
Electrocardiogram ECG or EKG, chart recording the elec. events of each heartbeat, recorded from the whole heart
Normal Sinus Rhythm NSR, 60-100 beats/min for adults
Tachycardia heart rate above 100 beats/min, prolonged can cause fibrillation
Bradycardia heart rate below 60 beats/min
Heart Block P-Q intervals >0.2 sec, produced by cardiac damage to the AV node or AV bundle.
Complete Heart Block results in ventricles depolarizing independently from the atria
Myocardial Ischemia decreased blood flow, increased Q-T interval
Myocardial Damage lengthens Q-T interval
Relaxation Period end of T wave to start of next P wave
Mean Electrical Axis average direction of depolarization, deviation shows heart disorders
Hypertrophy of One Ventricle shifts the mean axis of dep. toward the hypertrophied ventricle because it takes longer to depolarize
Left Ventricle Hypertrophy caused by hypertension or narrowing of the aortic semilunar valve
Right Axis Deviation Right bundle branch block, or right ventricle hypertrophy
Created by: connorquinby