Electrocardiogram Basics An electrocardiogram (ECG) is a medical test that records the electrical activity of your heart. This allows doctors to diagnose hea...
An electrocardiogram (ECG) is a medical test that records the electrical activity of your heart. This allows doctors to diagnose heart conditions, such as heart attack, stroke, and heart failure.
Key terms:
Electrodes: These are small, sticky pads placed on your chest and arms. They collect electrical signals from your heart.
Lead wires: These are thin wires that are connected to the electrodes. They transmit the electrical signals to a recording machine.
Recorder: This is a machine that collects and displays the ECG signals.
Baseline: This is the average electrical activity of your heart when you are at rest.
QRS complex: This is a specific pattern of electrical waves that is characteristic of heartbeats. It is divided into three phases: Q (depolarization), R (repolarization), and S (repolarization).
Electrocardiogram waveform: This is a graph that shows the different phases of the ECG.
How it works:
Electrodes are attached to your chest and arms.
Lead wires are inserted into the electrodes.
The ECG machine is turned on.
The heart generates electrical signals.
These signals are collected by the electrodes and transmitted through the lead wires to the recording machine.
The ECG machine displays the ECG waveform on a monitor.
Interpretation:
An ECG can be interpreted by a cardiologist. A normal ECG indicates that your heart is functioning normally. However, an ECG with abnormalities can indicate a heart condition. These abnormalities can include:
QT interval: This is the time between the Q and S phases of the ECG. A long QT interval can indicate a heart condition.
ST segment: This is a different area of the ECG that is used to diagnose heart conditions. A ST segment abnormality can also indicate a heart condition.
T-wave abnormalities: These are changes in the shape of the T wave on the ECG. They can indicate a heart condition.
Importance:
An ECG is a valuable tool for diagnosing heart conditions. It can help doctors identify and treat heart problems early on, when they are more likely to be life-threatening