Initially, both the atria and ventricles are relaxed (diastole). The QRS complex represents depolarization of the ventricles and is followed by ventricular contraction. The T wave represents the repolarization of the ventricles and marks the beginning of ventricular relaxation.

Depolarization is caused by a rapid rise in membrane potential opening of sodium channels in the cellular membrane, resulting in a large influx of sodium ions. Membrane Repolarization results from rapid sodium channel inactivation as well as a large efflux of potassium ions resulting from activated potassium channels.

What is meant by depolarization of the heart? Depolarization of the heart is the orderly passage of electrical current sequentially through the heart muscle, changing it, cell by cell, from the resting polarized state to the depolarized state until the entire heart is depolarized.

The PR segment represents the electrical conduction through the atria and the delay of the electrical impulse in the atrioventricular node.

The P wave in an ECG complex indicates atrial depolarization. The QRS is responsible for ventricular depolarization and the T wave is ventricular repolarization.

atrial depolarization

-The QRS wave represents the depolarization of the ventricles, which initiates the ventricular contraction….Complete answer:

The R wave is the first upward deflection after the P wave and part of the QRS complex. The S wave then becomes quite small in lead V6; this is called “normal R wave progression.” When the R wave remains small in leads V3 to V4 — that is, smaller than the S wave — the term “poor R wave progression” is used.

Poor R wave progression on your EKG could have meant you have had a heart attack in the past or long standing hypertension, none of which were proven when the echocardiogram was done. If you have a normal heart function and no cardiac risks, you have nothing to worry about.

Electrocardiographic poor R wave progression (PRWR) is found in patients with anterior myocardial infarction, left ventricular hypertrophy and right ventricular hypertrophy, and is also seen in apparently normal individuals.

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

Poor R wave progression refers to the absence of the normal increase in size of the R wave in the precordial leads as you progress from lead V1 to V6. In lead V1, the R wave should be small. The R wave becomes larger throughout the precordial leads to the point where the R wave is larger than the S wave in lead V4.

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). PRWP is defined by R wave height ≤ 3 mm in V3.

An anterior wall myocardial infarction — also known as anterior wall MI, or AWMI, or anterior ST segment elevation MI, or anterior STEMI — occurs when anterior myocardial tissue usually supplied by the left anterior descending coronary artery suffers injury due to lack of blood supply.

Complications associated with myocardial infarction

• Disturbance of rate, rhythm and conduction.
• Cardiac rupture.
• Heart failure.
• Pericarditis.
• Ventricular septal defect.
• Ventricular aneurysm.
• Ruptured papillary muscles.
• Dressler’s syndrome.

A heart attack, or myocardial infarction (MI), is permanent damage to the heart muscle. “Myo” means muscle, “cardial” refers to the heart, and “infarction” means death of tissue due to lack of blood supply.

About 68.4 per cent males and 89.8 per cent females still living have already lived 10 to 14 years or longer after their first infarction attack; 27.3 per cent males, 15 to 19 years; and 4.3 per cent, 20 years or longer; of the females, one is alive 15 years, one 23 years and one 25 years or longer.