What does S wave represent on ECG?

What does S wave represent on ECG?

the S wave signifies the final depolarization of the ventricles, at the base of the heart.

What is a deep S wave?

The S waves are unusually deep in V6 and may be even deeper than the R wave is tall. Other ECG signs of RVH include: Right axis deviation due to the overpowering current generated by a hypertrophied right ventricle.

What does small S wave mean?

You will also have seen a small negative wave following the large R wave. This is known as an S wave and represents depolarisation in the Purkinje fibres.

What is Brugada syndrome?

Brugada syndrome is a genetic disorder that can cause a dangerous irregular heartbeat. When this happens, the lower chambers of your heart (ventricles) beat fast and irregularly. This prevents blood from circulating correctly in your body.

What causes an S wave?

This is how P waves travel through the earth, moving it back and forth. An earthquake also causes secondary or shear waves, called S waves. These travel at about half the speed of P waves, but can be much more destructive. S waves move the earth perpendicularly to the direction the wave is traveling.

How can you tell if an ECG is abnormal?

Seek emergency medical attention if you experience:

1. chest pain or discomfort.
2. difficulty breathing.
3. heart palpitations or feeling your heart beating oddly.
4. the feeling that you might pass out.
5. racing heart.
6. the feeling that your chest is being squeezed.
7. sudden weakness.

How is RVH diagnosed?

RVH is diagnosed on ECG in the presence of a R/S ratio of greater than 1 in lead V1 in the absence of other causes, or if the R wave in lead V1 is greater than 7 millimeters tall. The strain pattern occurs when the right ventricular wall is quite thick, and the pressure is high, as well.

What does a tall QRS indicate?

Tall QRS complexes are usually caused by hypertrophy of one or both ventricles, or by an abnormal pacemaker or aberrantly conducted beat. Low voltage or abnormally small QRS complexes may be seen in obese patients, hyperthyroid patients and pleural effusion.

What does an Osborn wave indicate?

The Osborn waves provide an index of the presence of a prominent notch in the ventricular epicardium, with a more negative potential at the end of phase 1 of the action potential.

Is there A S wave in a normal ECG?

The S wave is the first downward deflection of the QRS complex that occurs after the R wave. However, a S wave may not be present in all ECG leads in a given patient. In the normal ECG, there is a large S wave in V1 that progressively becomes smaller, to the point that almost no S wave is present in V6.

What causes abnormal are wave progression in ECG?

Abnormal R-wave progression is a common finding which may be explained by any of the following conditions: Myocardial infarction: necrotic myocardium does not generate electrical potentials and therefore there is a loss of R-wave amplitude in the ECG leads reflecting the necrotic area ( Figure 10]

What do you need to know about the ECG curve?

Figure 1. The classical ECG curve with its most common waveforms. Important intervals and points of measurement are depicted. 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).

How are large Q and S waves related to HCM?

Conclusion: Large Q and S waves in lead III distinguished athletes from patients with HCM, independent of axis and well-known ECG markers associated with HCM. The correlation between IVS thickness in patients with HCM and IIIQ+Ssuggests a partial explanation for this association.