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What type of seismic waves travel fastest and arrive first during earthquakes?

P waves

What is R wave?

The R wave is the first upward deflection after the P wave and part of the QRS complex. The R wave morphology itself is not of great clinical importance but can vary at times. Throughout the precordial leads (V1-V6), the R wave becomes larger — to the point that the R wave is larger than the S wave in lead V4.

Is poor R wave progression normal?

Poor R wave progression (PRWP) is a relatively common electrocardiogram (ECG) finding in adults, occurring in as many as 10% of all hospitalized patients1). PRWP indicates possible prior anterior myocardial infarction (MI); however, it is observed frequently in apparently normal individuals.

What does a poor R wave mean?

Poor R-wave progression is a common ECG finding that is often inconclusively interpreted as suggestive, but not diagnostic, of anterior myocardial infarction (AMI). An interpretive approach to the ECG with poor R-wave progression is presented that has clinical relevance in the daily treatment of patients.

What happens at R wave?

the R wave reflects depolarization of the main mass of the ventricles –hence it is the largest wave. the S wave signifies the final depolarization of the ventricles, at the base of the heart.

What causes abnormal R wave progression?

Recent studies have shown that poor R-wave progression has the following four distinct major causes: AMI, left ventricular hypertrophy, right ventricular hypertrophy, and a variant of normal with diminished anterior forces. Standard ECG criteria that identify and distinguish these causes have been developed.

What does abnormal R wave progression mean?

Poor R Wave Progression Overview Poor R-wave progression (PRWP) is a common ECG finding that is often inconclusively interpreted as suggestive, but not diagnostic, of anterior myocardial infarction (AMI).