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On an electrocardiogram of atrial bigeminy, the QRS wave morphology in lead V1 was variable, and S waves with different amplitudes appeared in lead I, indicating incomplete right bundle branch block.

On an electrocardiogram of atrial bigeminy, the QRS wave morphology in lead V1 was variable, and S waves with different amplitudes appeared in lead I, indicating incomplete right bundle branch block.

Sinus tachycardia is defined as a sinus rhythm with a rate exceeding 100 beats per minute. It is a type of supraventricular tachycardia caused by enhanced automaticity of the sinoatrial node.

Sinus tachycardia is defined as a sinus rhythm with a rate exceeding 100 beats per minute. It is a type of supraventricular tachycardia caused by enhanced automaticity of the sinoatrial node.

Sinus tachycardia is defined as a sinus rhythm with a rate exceeding 100 beats per minute. It is a type of supraventricular tachycardia caused by enhanced automaticity of the sinoatrial node.

Sinus tachycardia is defined as a sinus rhythm with a rate exceeding 100 beats per minute. It is a type of supraventricular tachycardia caused by enhanced automaticity of the sinoatrial node.

A 36 year old man survived CPR after sudden syncope. The electrocardiogram was suggestive of Brugada syndrome type 1. Finally, he was treated with an ICD.

A 36 year old man survived CPR after sudden syncope. The electrocardiogram was suggestive of Brugada syndrome type 1. Finally, he was treated with an ICD.

HCV is the virus that causes hepatitis C in humans; here are the details of its genome.

HCV is the virus that causes hepatitis C in humans; here are the details of its genome.

Entecavir is an antiviral drug and a reverse transcriptase inhibitor that can suppress the replication and viral load of the hepatitis B virus.

Entecavir is an antiviral drug and a reverse transcriptase inhibitor that can suppress the replication and viral load of the hepatitis B virus.

Distribution of global AIDS cases between 2001 and 2009.

Distribution of global AIDS cases between 2001 and 2009.

The higher the number of unhealthy lifestyles, the higher the incidence of cardiovascular disease, cardiovascular disease mortality and total mortality.

The higher the number of unhealthy lifestyles, the higher the incidence of cardiovascular disease, cardiovascular disease mortality and total mortality.

In second degree Type II sinoatrial block, sinus impulses are partially conducted to the atria and partially blocked, with the long P-P interval being twice the length of the short P-P interval.

In second degree Type II sinoatrial block, sinus impulses are partially conducted to the atria and partially blocked, with the long P-P interval being twice the length of the short P-P interval.

Second degree sinoatrial block refers to a condition in which sinus impulses are only partially conducted to the atria; this results in the appearance of sinus P waves on the ECG, while the blocked co

Second degree sinoatrial block refers to a condition in which sinus impulses are only partially conducted to the atria; this results in the appearance of sinus P waves on the ECG, while the blocked co

Posterior wall leads are three chest leads—comprising leads V7, V8, and V9—placed on the left side of the back to detect myocardial ischemia of the posterior wall.

Posterior wall leads are three chest leads—comprising leads V7, V8, and V9—placed on the left side of the back to detect myocardial ischemia of the posterior wall.

Posterior wall leads are three chest leads—comprising leads V7, V8, and V9—placed on the left side of the back to detect myocardial ischemia of the posterior wall.

Posterior wall leads are three chest leads—comprising leads V7, V8, and V9—placed on the left side of the back to detect myocardial ischemia of the posterior wall.

Right-sided chest leads involve placing six chest leads over the right anterior chest; lead V1 is positioned at the location of lead V2 from the standard six-lead chest configuration.

Right-sided chest leads involve placing six chest leads over the right anterior chest; lead V1 is positioned at the location of lead V2 from the standard six-lead chest configuration.

Male, 33 years old, healthy; the electrocardiogram from the medical examination was normal.

Male, 33 years old, healthy; the electrocardiogram from the medical examination was normal.

In a standard 12-lead electrocardiogram, there are six chest leads, with electrodes placed on the skin of the chest.

In a standard 12-lead electrocardiogram, there are six chest leads, with electrodes placed on the skin of the chest.

Mucinous adenocarcinoma of the lung is a distinct subtype of pulmonary adenocarcinoma; the neoplastic cells consist of goblet cells or tall columnar cells, and the tumor cells secrete copious amounts

Mucinous adenocarcinoma of the lung is a distinct subtype of pulmonary adenocarcinoma; the neoplastic cells consist of goblet cells or tall columnar cells, and the tumor cells secrete copious amounts

Sinus rhythm is a heart rhythm originating from the sinoatrial node; it is the normal source of heart rhythm in most individuals. Sinus rhythm is generated by pacemaker cells located within the SA nod

Sinus rhythm is a heart rhythm originating from the sinoatrial node; it is the normal source of heart rhythm in most individuals. Sinus rhythm is generated by pacemaker cells located within the SA nod

In the event of a sinus arrest, if an escape beat and escape rhythm fail to occur in a timely manner, the patient will experience symptoms of syncope.

In the event of a sinus arrest, if an escape beat and escape rhythm fail to occur in a timely manner, the patient will experience symptoms of syncope.

The coronary arteries are divided into the left coronary artery and the right coronary artery system.

The coronary arteries are divided into the left coronary artery and the right coronary artery system.

When the blood potassium concentration significantly increases, it can inhibit ventricular conduction, cause diffuse intraventricular block, and generate wide QRS waves and sinoventricular conduction.

When the blood potassium concentration significantly increases, it can inhibit ventricular conduction, cause diffuse intraventricular block, and generate wide QRS waves and sinoventricular conduction.

$Impulse encounter effective refractory period will lead to conduction interruption, and encounter relative refractory period will lead to conduction delay.$

Impulse encounter effective refractory period will lead to conduction interruption, and encounter relative refractory period will lead to conduction delay.

The PR interval of an ecg includes the time during which supraventricular impulses are transmitted through the atrioventricular node, His bundle, bundle branches, and terminal Purkinje fibers.

The PR interval of an ecg includes the time during which supraventricular impulses are transmitted through the atrioventricular node, His bundle, bundle branches, and terminal Purkinje fibers.

The chest electrode of ECG includes conventional chest lead, posterior wall lead and right ventricular lead. The placement of chest lead electrode shall comply with the specification.

The chest electrode of ECG includes conventional chest lead, posterior wall lead and right ventricular lead. The placement of chest lead electrode shall comply with the specification.

When inspiration, the heart rate increases and more blood flows through the alveoli, resulting in an optimal ventilation-to-blood flow ratio, thus helping to oxygenate the blood.

When inspiration, the heart rate increases and more blood flows through the alveoli, resulting in an optimal ventilation-to-blood flow ratio, thus helping to oxygenate the blood.

Marfan syndrome is an autosomal dominant connective tissue disease characterized by elongated limbs, cardiovascular system abnormalities, and sudden death.

Marfan syndrome is an autosomal dominant connective tissue disease characterized by elongated limbs, cardiovascular system abnormalities, and sudden death.

Female, 71 years old, clinically diagnosed with coronary heart disease. The electrocardiogram shows severe sinus bradycardia, with symptoms of dizziness and a blood pressure of 80 and 40mmHg.

Female, 71 years old, clinically diagnosed with coronary heart disease. The electrocardiogram shows severe sinus bradycardia, with symptoms of dizziness and a blood pressure of 80 and 40mmHg.

The illustration shows the two patterns of VT episodes.The green circle represents sinus rhythm. Picture A shows paroxysmal episodes of VT a, and picture B shows short bursts.

The illustration shows the two patterns of VT episodes.The green circle represents sinus rhythm. Picture A shows paroxysmal episodes of VT a, and picture B shows short bursts.

When the baseline of ECG is interfered by its own or external electrical signal, it will affect the shape and measured value of ECG wave, especially ST segment offset amplitude.

When the baseline of ECG is interfered by its own or external electrical signal, it will affect the shape and measured value of ECG wave, especially ST segment offset amplitude.

On ECG, U wave is a low wave after T wave, and its mechanism is still unclear. It may be an electromechanical feedback wave.It is easy to recognize when the heart rate is slow.

On ECG, U wave is a low wave after T wave, and its mechanism is still unclear. It may be an electromechanical feedback wave.It is easy to recognize when the heart rate is slow.

When the electrodes in the chest lead are placed incorrectly, the wrong amplitude evolution of R wave and S wave will occur, which is easy to be misdiagnosed as poor increase of R wave or old AMI.

When the electrodes in the chest lead are placed incorrectly, the wrong amplitude evolution of R wave and S wave will occur, which is easy to be misdiagnosed as poor increase of R wave or old AMI.

In this case, when the variant angina pectoris attacked, note the loss of the S wave of the QRS complex in Figure C, indicating grade III myocardial ischemia.

In this case, when the variant angina pectoris attacked, note the loss of the S wave of the QRS complex in Figure C, indicating grade III myocardial ischemia.

Third degree atrioventricular block can occur in the atrioventricular node, His bundle, and bundle branches, and only the escape rhythm from below the block layer can excite the ventricle.

Third degree atrioventricular block can occur in the atrioventricular node, His bundle, and bundle branches, and only the escape rhythm from below the block layer can excite the ventricle.