Electrocardiogram: Difference between revisions
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imported>David E. Volk m (ECG moved to Electrocardiogram) |
imported>Robert Badgett (started Electrolyte effects on the ECG) |
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| Line 6: | Line 6: | ||
: 10lead - additional leads of V1-V6 replacing the V lead, with each V lead being placed between the ribs | : 10lead - additional leads of V1-V6 replacing the V lead, with each V lead being placed between the ribs | ||
The health and function of the heart can be measured by the shape of the ECG waveform. Typical heart problems are leaking valves and blocked coronary arteries. | The health and function of the heart can be measured by the shape of the ECG waveform. Typical heart problems are leaking valves and blocked coronary arteries. | ||
==Electrolyte effects on the ECG== | |||
===Calcium=== | |||
====Hypercalcemia==== | |||
* Shortening of the [[QT interval]] | |||
====Hypocalcemia==== | |||
* Prolongation of the [[QT interval]] | |||
===Potassium=== | |||
====Hyperkalemia==== | |||
* Peaked T waves | |||
* PR interval lengthens | |||
* QRS duration increases | |||
====Hypokalemia==== | |||
* Depression of the ST segment | |||
* Decrease in the amplitude of the T wave | |||
* U waves, especially in the lateral precordial leads V4-V6 | |||
===Magnesium=== | |||
Revision as of 21:55, 15 July 2008
ECG stands for electrocardiogram and is also known as EKG. ECG refers to the small voltages (~1mv) found on the skin caused by the sinus which is the heart's pacemaker. ECG electrodes usually come as 3,5 or 10 lead. These are:
- 3lead - Left ARM or LA, Right Arm or RA, and Left Leg or LL
- 5lead - additional leads of Right Leg or RL and V for Chest
- 10lead - additional leads of V1-V6 replacing the V lead, with each V lead being placed between the ribs
The health and function of the heart can be measured by the shape of the ECG waveform. Typical heart problems are leaking valves and blocked coronary arteries.
Electrolyte effects on the ECG
Calcium
Hypercalcemia
- Shortening of the QT interval
Hypocalcemia
- Prolongation of the QT interval
Potassium
Hyperkalemia
- Peaked T waves
- PR interval lengthens
- QRS duration increases
Hypokalemia
- Depression of the ST segment
- Decrease in the amplitude of the T wave
- U waves, especially in the lateral precordial leads V4-V6