the electrocardiograph
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A normal ECG of a human will show a P wave, QRS complex, and T wave. The P wave represents atrial depolarization, the QRS complex represents ventricular depolarization, and the T wave represents ventricular repolarization. These waves correspond to the electrical activity of the heart during each phase of the cardiac cycle.
In an ECG reading for atrial fibrillation (AFib), there will be irregular and rapid electrical signals in the atria, leading to a chaotic heart rhythm. This is shown as erratic waves on the ECG tracing. In a normal ECG reading, the heart's electrical signals follow a regular pattern, resulting in a steady and organized heart rhythm with distinct waves on the ECG tracing.
A normal T wave on an ECG is typically upright, smooth, and rounded. It should not be too tall or too deep, and should follow the QRS complex without any abnormalities.
Two T waves on an ECG indicate that the heart's electrical activity is normal and functioning properly.
In an ECG showing atrial fibrillation (AFib), the rhythm appears irregular with no distinct P waves, and the QRS complexes may be normal. In contrast, a normal ECG rhythm shows regular intervals between heartbeats, clear P waves before each QRS complex, and consistent QRS complexes.
The key differences between an ECG reading of atrial fibrillation and a normal ECG are irregular heart rhythm and absence of distinct P waves in atrial fibrillation. These differences can be identified by observing the irregularity in the R-R intervals and the presence of fibrillatory waves instead of P waves. Interpreting these differences can help diagnose atrial fibrillation and guide appropriate treatment.