32 Bilder zum Thema "electrocardiogram theory" bei ClipDealer

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Female, 6 years old, clinically diagnosed with Tetralogy of Fallot. The electrocardiogram shows sinus rhythm, extreme right axis deviation, biatria abnormality, right ventricular hypertrophy, etc.
In the first degree of atrioventricular block, the PR interval was prolonged by more than 200ms, and there was no QRS wave loss in ECG. The blocking site can occur anywhere in the conduction system.
When measuring the cardiac cycle, select leads with stable ECG waveform and choose ECG waves from the same location as the measurement reference point.
The electrocardiogram diagnosis of first-degree atrioventricular block is relatively simple, with an adult PR interval greater than 200ms and no QRS wave shedding.
If atrioventricular dissociation can be observed during wide QRS wave tachycardia, it can help diagnose ventricular tachycardia.
A 2:1 left bundle branch block is considered when complete left bundle branch block alternates with normal QRS complexes and the PR interval is fixed.
In measuring the cardiac cycle, it is necessary to select the same component of adjacent cardiac waves and the same measurement reference point, such as measuring the PP interval and RR interval.
When ventricular hypertrophy occurs, the amplitude of the S-wave in each lead will change, which is a clue for electrocardiogram diagnosis of ventricular hypertrophy.
When the atrium and ventricle maintain a 1:1 conduction relationship, the atrial rate and ventricular rate are the same, otherwise they need to be evaluated separately.
In the conventional 12 lead ECG, the chest lead system represents the electrical activity in the transverse or horizontal plane, and there are 6 traditional leads.
Sometimes, left ventricular hypertrophy with tall T waves is easily misdiagnosed as hyperkalemia and hyperacute T waves, and ECG needs to be carefully identified in combination with clinic.
Einthoven ECG triangle, including augmented unipolar limb lead illustration
Einthoven triangle assumes that the left upper limb, right upper limb and left lower limb form an equilateral triangle, and the heart is located at the center of the triangle.
Einthoven ECG triangle, including augmented unipolar limb lead illustration
The upper limit value of R wave amplitude in each lead of ECG is related to age, sex, body shape, etc. Here are the ECG data of Japanese adults.
When the R wave amplitude of lead V1 in adults exceeds 6mm and there are no organic heart disease or other disease electrocardiogram changes, it is a simple right ventricular high voltage.
In ventricular septal defects, left ventricular hypertrophy, biventricular hypertrophy, or right ventricular hypertrophy ECG may be present.
Sometimes, the amplitude of sinus P wave is extremely low, close to equipotential line, and it is easy to be misdiagnosed as junctional rhythm.
The ECG characteristics of complete interatrial block are positive and negative biphasic P waves in inferior leads, and these patients are prone to atrial arrhythmia, that is, Bayes syndrome.
Patients with ventricular septal defects have left ventricular hypertrophy in the early stage and biventricular hypertrophy in the middle and late stages.
Negative direction of QRS main wave in aVL lead
In the first degree of atrioventricular block, the PR interval was prolonged by more than 200ms, and there was no QRS wave loss in ECG. The blocking site can occur anywhere in the conduction system.
Simple left ventricular high voltage has no abnormalities such as left atrial abnormality, left axis deviation and ST-T change, but the amplitude of R wave in left chest lead is increased.
In the frontal lead system, the lead axes of the 6 limb leads form a hexaxial reference system, which is one of the important theories of electrocardiography.
Ventricular high voltage refers to an increase in R-wave amplitude, which can be both a normal variation and an electrocardiographic indicator of ventricular hypertrophy.
Male, 38 years old. There is no history of tachycardia in clinical practice. Electrocardiogram diagnosis: Sinus rhythm; Short PR interval; Early repolarization.
When the long axis of the heart swings up and down and left and right, it can cause a change in the polarity of the QRS main wave in the aVL and aVF leads, namely the horizontal and vertical heart.
On ECG paper, five small squares make up a middle square. Divide 300 by the number of middle squares occupied by adjacent identical ECG waves to get the heart rate.
When the heart rotates around the anteroposterior axis, the heart can only swing up and down and left and right, which affects the ECG waveform of limb leads.
According to the relationship between the long axis of the heart and the horizontal axis of the direction, the heart shadow can be divided into three types: horizontal , oblique and vertical heart.
In frontal lead system, anatomical transposition and electrical transposition are not in good agreement, because some electrical transposition has nothing to do with anatomy.
The atrial foci originating from the anterior and posterior walls of the right atrium form an inverted P wave and positive and negative biphasic P wave in the V1 lead, respectively.

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