ECG can be analyzed by studying components of the waveform. These waveform components indicate cardiac electrical activity. The first upward of the ECG tracing is the P wave. It indicates atrial contraction. The QRS complex begins with Q, a small downward deflection, followed by a larger upwards deflection, a peak (R); and then a downwards S wave. This QRS complex indicates ventricular depolarization and contraction.
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The Chickasaw are Native American people of the United States who originally resided along the Tennessee River and other parts of Tennessee, West of Huntsville, Alabama, covering parts of Mississippi and the southwest side of Kentucky.