Question | Answer |
Electrical patterns of the heart can be detected from the surface of the skin by | Attaching an electrode and connecting it to an electrocardiograph |
An abnormal heart rhythm is called an | Arrhythmia or Dysrhythmia |
Electrocardiography | The study of arrhythmia or dysrhythmia |
EKG (ECG) refers to an | Electrocardiograph (EKG) machine or record |
Electrocardiograph will display electrical patterns of the heart on a | monitor or graph paper |
Electrical activity is displayed best if you can assure | good contact between the skin and electrode |
Good contact between the skin and electrode can be achieved by | 1.Abrading the skin w/alcohol pad
2.Removing obstacles (dirt/hair) |
Morphology | The study of shapes |
The writing point on an EKG is an | Atylus |
When the EKG is turned on (but not yet connected to the patient) it will produce a straight line called an | isoelectric line |
An upright wave on an EKG is called | A positive |
A downward wave onan EKG is called | A negative |
Electricity flowing toward 'POSITIVE' electrode produce | an 'UPRIGHT' pattern |
Electricity flowing toward 'NEGATIVE' electrode produce | an 'INVERTED' pattern |
Different electrical views of the heart can be seen by | 1.Rearranging the electrode
2.Diverting the direction of the electrical impulse by turning a knob on the electrocardiograph |
Each electrical view is called a | Lead |
The most common lead used for cardiac monitoring is | Lead II |
Vertical lines | on the EKC/ECG graph paper represent | Time |
Horizontal lines __ on the EKG/ECG graph paper represent | Voltage / amplitude |
Each small square on the EKG/ECG graph paper represents | 0.04 sec |
Each dark 'block' of squares on the EKG/ECG graph paper represent | 0.20 sec = (0.04x5sq) |
Every (3) three seconds on the EKG/ECG graph paper is represented by a | TIC mark at the top of the graph paper |
A cardiac cycle is made up of a | PQRST |
The first wave usually seen on a cardiac cycle is the | P wave |
P wave represents | Atrial depolarization AKA Atrial discharge state |
The second wave usually seen on a cardiac cycle is the | QRS Complex |
QRS complex represents | Ventricular depolarization AKA Ventricular discharge state |
A normal QRS complex is how long? | 0.12 sec or less (less then 3 small squares) |
The last wave usually seen on a cardiac cycle is the | T wave |
T wave represents | Ventricular REpolarization AKA ventricular recovery time |
The PRI (PR interval) begins where the | P wave leaves the 'isoelectric line' and ends where the QRS complex begins |
A normal PRI - PR interval) is how long? | 0.12 - 0.20 seconds (3-5 small squares) |
Electrical interference sometimes seen on the EKG display is called | Artifact |
Artifact can be caused by | 1.Muscle tremors
2.Patient movement
3.Loose electrodes
4.60 cycle interference |
60 cycle interference can be caused by | Electrical interference from other electrical machinery such as cellular phones, electric shavers, radio, floor buffer, video games, i-pods, etc |