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It is best to measure the QRS wave duration in a 12 lead synchronous electrocardiogram, as some of the QRS wave start and end points are located on the isoelectric line.
On the conventional 12-lead ECG, under normal circumstances, there are some inherent patterns of QRS waves in different leads, which are not exactly the same.
QRS wave is a ECG wave generated by ventricular excitation, typically in a three-phase waveform, named qRs wave. The QRS waveform of each lead is different.
QRS wave is a ECG wave generated by ventricular excitation, typically in a three-phase waveform, named qRs wave. The QRS waveform of each lead is different.
When a 2:1 bundle branch block occurs, the refractory period of the bundle branch is longer than one basal cardiac cycle but shorter than two basal cardiac cycles.
Narrow QRS wave and wide QRS wave
When there are more than 3 components in the QRS wave of lead V1, do not diagnose it as right bundle branch block, as this is a manifestation of fragmented QRS wave.
On a conventional 12 lead electrocardiogram, the QRS wave of complete right bundle branch block in lead V1 is usually an rSR three-phase waveform.
At present, the definition of narrow QRS complex is QRS durationgreater than or equal to 120ms, and wide QRS complex is defined as QRS duration beyond 120ms.
Assist devices, artificial hearts, LVADs, DCM
hand draws heart
Man with an assist devices, artificial hearts, LVAD, left or rig
Artificial heart LVAD,
Catheterization and small red heart. Cardiac ventriculography is a medical imaging test used to determine a patient cardiac function in the right or left ventricle
Man with an assist devices, artificial hearts, LVAD, left or right ventricular assist device, controller batteries and power supply cable.
The QT interval of ECG is from the beginning of QRS wave to the end of T wave, representing the total time of ventricular depolarization and repolarization.
Catheterization. Cardiac ventriculography is a medical imaging test used to determine a patient cardiac function in the right or left ventricle
Catheterization. Cardiac ventriculography is a medical imaging test used to determine a patient cardiac function in the right or left ventricle
Catheterization. Cardiac ventriculography is a medical imaging test used to determine a patient cardiac function in the right or left ventricle
The illustration shows the two patterns of ventricular tachycardia episodes.The green circle represents sinus rhythm. Picture A shows paroxysmal episodes of ventricular tachycardia, and picture B shows short bursts.
R wave greater than S wave is judged to be positive; R smaller than S is judged to be negative; R equal to S amplitude is judged to be equipotential.
Catheterization. Cardiac ventriculography is a medical imaging test used to determine a patient cardiac function in the right or left ventricle
Due to the large mass of the left ventricle, the dominant excitation potentials of the left and right ventricles are oriented towards the left ventricle, i.e. towards the left, Inferior and posterior.
Male, 23 years old, healthy. When the initial excitation potential of the ventricle deviates from a certain lead axis, a Q wave will be projected onto that lead, which is a physiological Q wave.
Echocardiography or cardiac ultrasound shows normal values except for left ventricular relaxation abnormality, an echocardiogram, a cardiac echo is to use a standard ultrasound or Doppler ultrasound
Echocardiography or cardiac ultrasound shows normal values except for left ventricular relaxation abnormality, an echocardiogram, a cardiac echo is to use a standard ultrasound or Doppler ultrasound
Echocardiography or cardiac ultrasound shows normal values except for left ventricular relaxation abnormality, an echocardiogram, a cardiac echo is to use a standard ultrasound or Doppler ultrasound
Male, 84 years old, admitted to hospital with chest pain for 1 day. ECG showed acute inferior and posterior MI and possibly right MI. The patient died of ventricular fibrillation the next day.
A patient with acute inferior and anterior myocardial infarction(MI) caused by distal occlusion of the RCA and one day later, combined with occlusion of the LAD, caused high lateral and anterior MI.
Male, 84 years old, admitted to hospital with chest pain for 1 day. These ECG rhythms are the Holter monitor records of the patients after admission, and they are third degree atrioventricular block.
The terminal excitation of the ventricle forms the final part of the S wave in lead V1, gradually returning to the isoelectric line, and forms a small S wave in lead V5.
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Echocardiography or cardiac ultrasound shows normal values except for left ventricular relaxation abnormality, an echocardiogram, a cardiac echo is to use a standard ultrasound or Doppler ultrasound
Four anatomical malformations of tetralogy of Fallot: 1 aortic straddling; 2 ventricular septal defect; 3 right ventricular hypertrophy and 4 pulmonary artery stenosis.
Idiopathic ventricular tachycardia originating from the right ventricular outflow tract forms a high amplitude R wave in the inferior leads and a QS wave or rS wave in the V1 lead.
Idiopathic ventricular tachycardia originating from the right ventricular outflow tract is a benign ventricular tachycardia. This ECG shows a short burst pattern of ventricular tachycardia.
A patient with acute inferior and anterior myocardial infarction(MI) caused by distal occlusion of the RCA and one day later, combined with occlusion of the LAD, caused high lateral and anterior MI.
In the aVR lead, the QRS wave can be in the form of QS, rS, Qr, rsr, etc., with the main wave being negative.
Echocardiography or cardiac ultrasound shows normal values except for left ventricular relaxation abnormality, an echocardiogram, a cardiac echo is to use a standard ultrasound or Doppler ultrasound
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When the frontal QRS axis is at +83, the R amplitude of lead aVF is the highest.The frontal QRS axis is almost perpendicular to the axis of lead .
Echocardiography or cardiac ultrasound shows normal values except for left ventricular relaxation abnormality, an echocardiogram, a cardiac echo is to use a standard ultrasound or Doppler ultrasound
Echocardiography or cardiac ultrasound shows normal values except for left ventricular relaxation abnormality, an echocardiogram, a cardiac echo is to use a standard ultrasound or Doppler ultrasound
Echocardiography or cardiac ultrasound shows normal values except for left ventricular relaxation abnormality, an echocardiogram, a cardiac echo is to use a standard ultrasound or Doppler ultrasound
Echocardiography or cardiac ultrasound shows normal values except for left ventricular relaxation abnormality, an echocardiogram, a cardiac echo is to use a standard ultrasound or Doppler ultrasound
The initial excitation of the ventricle forms a small r wave in lead V1 and a small q wave in lead V6.
The accompanying ST-T changing in the context of wide QRS complexes.The wide QRS complex changes the order of ventricular depolarization and secondary changes in the order of repolarization.
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Echocardiography or cardiac ultrasound shows normal values except for left ventricular relaxation abnormality, an echocardiogram, a cardiac echo is to use a standard ultrasound or Doppler ultrasound
Idiopathic ventricular tachycardia originating from the right ventricular outflow tract is a benign ventricular tachycardia. This ECG shows a short burst pattern of ventricular tachycardia.

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