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ECG Chapters 3-4
| Question | Answer |
|---|---|
| Standard or Limb leads | Bipolar Leads |
| 3 Standard or limb leads | Leads 1,2,3 |
| Lead 1 Records | Tracing from the right arm(-) and the left arm(+) |
| Lead 2 Records | Tracing from the right arm (-)and left leg(+) |
| Lead 3 Records | Electrical Activity from the left arm(-) to the left leg(+) |
| what do leads Leads 1,2,3 produce | Positive Deflections |
| 3 Augmented Leads | VR,VL & VF |
| The R,L&F in VR,VL&VF Refer to | The direction in which the lead is measuring |
| V(R) | Right Arm |
| V(L) | Left Arm |
| V(F) | Foot(Left Leg/Foot) |
| VR Records | Electrical Activity From the heart to the right arm |
| VL Records | Electrical Activity From the heart to the left arm |
| VF records | Electrical Activity From the heart to the left leg |
| Augmented Leads | Unipolar leads |
| Precordial Leads | Chest Leads |
| Each Precordial Leads | V1-V6 |
| Precordial Leads Records | Activity between 6 points on the chest and within the heart |
| "Bipolar leads" means | current flow is measured in both directions |
| records one lead tracing at a time | single-channel |
| controls the speed of the paper during an ECG tracing | speed |
| data that are entered into an ECG machine | input |
| changes the size of the ECG tracing | gain |
| conductor wire attached to the ECG machine | lead |
| ability to record more than one lead tracing at a time | multichannel |
| indicates voltage on the ECG tracing | millivolt |
| indicates time on the ECG tracing | millimeter |
| amplifies the electrical impulse and converts to mechanical action | signal processing |
| disposable sensors that receive the electrical activity of the heart | electrode |
| displays the tracing for the electrical activity of the heart | output display |
| The three basic functions of the electrocardiograph | input, signal processing, and output display. |
| bradycardia | Slow Heartbeat |
| tachycardia | Fast Heartbeat |
| multichannel ECG | monitors all 12 leads but records 3 leads at a time. |
| The three most important controls on the electrocardiograph include | the speed, the gain, and the artifact filter. |
| When the deflections on the ECG tracing are too short or too tall, you will need to | correct the gain. |
| Newer ECG machines detects that a lead is reversed will display it where | LCD panel. |
| What should the ECG operator do when the patient's heart rate is very fast | Set the speed control at 50 mm/sec to widen the complexes |
| The standard paper speed for the ECG machine | 25 mm/sec. |
| horizontal reading on the ECG paper represents | Time |
| vertical reading represents | Voltage |
| The two most commonly used types of ECG graph paper | standard grid and dot matrix. |
| A patient's ECG report must be maintained for at least | 7 years. |
| smallest vertical line or box | 0.04 second |
| one vertical heavy line or box | 0.2 second |
| five heavy lines or boxes | 1 second |
| Why is Lead II used during continuous cardiac monitoring | It shows the P wave the best. |
| What Chest Leads can be moved to the right side of the chest to reduce crowding | V3 & V4 |
| Why is Lead II used during continuous cardiac monitoring | It shows the P wave the best. |
| What Chest Leads can be moved to the right side of the chest to reduce crowding | V3 & V4 |
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