P waves, or Primary waves, are the first waves to arrive at a seismograph. P waves are the fastest seismic waves and can move through solid, liquid, or gas. They leave behind a trail of compressions and rarefactions on the medium they move through.

A P wave (primary wave or pressure wave) is one of the two main types of elastic body waves, called seismic waves in seismology. P waves travel faster than other seismic waves and hence are the first signal from an earthquake to arrive at any affected location or at a seismograph .

The P wave is the first deflection of the cardiac cycle seen on an EKG. It represents the electrical activity associated with atrial depolarization. The normal P wave is a low amplitude, vertical, rounded wave, resembling a gentle hill, which is continued immediately from the QRS complex.

2022年1月29日 · The P wave is the first positive deflection on the ECG and represents atrial depolarisation. Atrial abnormalities are most easily seen in the inferior leads (II, III and aVF) and lead V1, as the P waves are most prominent in these leads. The Atrial Waveform – …

ECG interpretation requires knowledge of these waves and intervals. ECG interpretation traditionally starts with an assessment of the P-wave. The P-wave reflects atrial depolarization (activation). The PR interval is the distance between the onset of …

2020年7月26日 · The P wave is a summation wave – electrical activity that comes from successive signaling from multiple points, causing wave-like contractions. These multiple points contain pacemaker cells that generate action potentials independently of the CNS.

2023年7月24日 · This article will review the basics of P wave interpretation, including characteristics of both the normal P wave and its pathologic abnormalities. The P wave and PR segment is an integral part of an electrocardiogram (ECG).

In cardiology, the P wave on an electrocardiogram (ECG) represents atrial depolarization, which results in atrial contraction, or atrial systole. The P wave is a summation wave generated by the depolarization front as it transits the atria.

2023年7月29日 · In electrocardiography (ECG), the P wave represents the electrical activity associated with atrial depolarization, which is the contraction of the atria. It is an essential component of the ECG waveform and provides valuable information about the function and rhythm of the heart.

The P-wave is a small, positive and smooth wave. It is small because the atria make a relatively small muscle mass. If the rhythm is sinus rhythm (i.e under normal circumstances) the P-wave vector is directed downwards and to the left in the frontal plane and this yields a positive P-wave in lead II (Figure 2, right hand side).