| Question |
Answer |
| ECG |
ECG # Electrocardiogram = records the electrical impulses that occur in the myocardium during a cardiac cycle. |
| The SA node triggers an impulse, the atrial fibers produce an electrial change called a "__" wave |
P - wave |
| The heart is located in the "______" cavity |
Thoracic or chest cavity |
| The apex of the heart points towards the |
Left Hip |
| Give 5 examples why a dr. may order a ECG |
After a Myocardial infarction - Symptoms - due to prescribed medications - insertion of a pacemaker - heart condition |
| Atrioventrical valves |
tricuspid and mitral valves |
| 5 major vessels |
Superior Vena Cava; Inferior Vena Cava; Pulmonary Artery; Pulmonary Veins; Aorta |
| 3 Cardiac cells |
1; Automaticity (initiates the impulse) 2; Conductivity (passes the impulse along) 3; Contractility ( reacts to the impulse) |
| When a cardiac cell is resting it is |
Polarised - resting |
| When an electrical impulse is recieved it is |
Depolarised - action |
| Once the pathway has been depolarised it is |
REpolarised - REcovery |
| What is the order of primary cardiac conduction |
SA nodes - VA nodes - Bundle of His (right and left) - Purkinje fibers |
| P wave |
After the SA node fires spontaneously, a wave of depolarization spreads through the Atria, creating a wave. |
| What happens immediately after the P wave |
There is a pause (as the impulse passes through the AV node) a straight line on the ECG |
| In the QRS complex - any wave above the baseline is called a "__" wave |
R wave |
| A negative deflection following an R wave is an "__" wave |
S wave |
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