What are the reasons for the shortening of the pq interval in the ECG picture, diagnosis and diagnosis

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Cardiovascular diseases are a common cause of death among the population of our country. In most cases, a tragic outcome can be prevented if the diagnosis is carried out in time and the pathologies found are treated. However, it is not easy to read the results of an electrocardiogram alone, and it is better to do it to a good cardiologist. What does the shortening of the pq interval mean on the ECG results? Do I need any help?


  • Definition of concepts
  • Process Mechanism
  • Differences between the syndrome and the phenomenon
  • The reasons for the development of the shortened interval pq
  • The provoking factors
  • Symptoms of paroxysmal tachycardia
  • Diagnostic measures

Definition of concepts

Fortunately, most people, feeling a malfunction in the work of the heart, turn to doctors for advice. Different types of arrhythmias, including rapid or uneven heart rate, develop due to malfunctions in the conductive system of the heart. These deviations from the norm can be seen on an electrocardiogram.

Any abnormality on the ECG can only be seen by a doctor

Deviations in the work of the conduction system of the heart almost always affect the interval pq. In most cases, the syndrome of the shortened interval develops.

The syndrome of the truncated interval pq is understood as the decrease in the transfer interval of the pulse from the atria to the ventricles through the atrioventricular junction.

Under this characteristic are such states:

  • Wolff-Parkinson-White syndrome;
  • Clerk-Levy-Cristesco syndrome (or clc syndrome).

To better understand what the essence of pathology is, it is worth considering what happens inside, when the ECG reflects such a picture.

Process Mechanism

Pq interval is a parameter when decoding an electrocardiogram, which allows the doctor to correctly evaluate the rate of transmission of an electrical pulse from the pacemaker to the atria and ventricles. This impulse is transmitted due to the atrioventricular connection, which acts as a "transmitter" between the zones of the heart.

A short pq interval is considered when it is less than 1 second. The ECG norm for the pq interval is in the range up to, sec.

When the interval increases, this indicates problems in conduction within the atrioventricular junction. If it is shortened, then the impulses go too fast. As a result, some forms of arrhythmia or tachycardia develop.

Syndrome clc refers to cases where changes within the heart muscle are sufficiently pronounced. At the same time, there is an additional bundle of electrical conductivity (a beam of James). It is through it that additional pulses are emitted.

Differences between the syndrome and the phenomenon

Specialists in the field of cardiology distinguish clc syndrome and the phenomenon. What is the difference between these two diagnoses?

The SLS phenomenon does not threaten the patient's life. A person simply must periodically visit a cardiologist, carefully monitor diet, lifestyle, avoid bad habits, stress and feelings. Although the interval pq is shortened, a person does not experience practically any symptoms and this diagnosis does not affect his state of health.

Syndrome SLS on the contrary, can be extremely dangerous for the life of the patient. The fact is that in addition to changes that reflect the electrocardiogram, a person can display a number of dangerous symptoms, such as paroxysmal tachycardia, most often, supraventricular.


Important! If a patient with a syndrome is competent and in time to provide emergency medical care, an attack can be suppressed. In severe cases, the patient is threatened with a sudden fatal outcome associated with cardiac arrest.

A competent help saves a person's life

The reasons for the development of the shortened interval pq

The main reason for the development of this pathology is an innate predisposition. In fact, this is one of the forms of congenital pathology. But if she manifests herself, or not, in many respects depends on a person's life.

The only difference between a healthy heart and a heart with a syndrome is the presence of an additional electrically conductive beam inside the heart muscle. He can not show himself for many years, but sometimes the pathology is diagnosed in infancy. In some cases, arrhythmic manifestations due to an additional bundle begin to appear during periods of active growth and in adolescence.

Sometimes pathology is reflected in childhood or adolescence

The provoking factors

Nevertheless, the way of life affects the likelihood of complications. The exact causes can not be determined for specialists, however, as the statistics show, there is a group of factors, the action of which paroxysmal tachycardia occurs most often.

The aggravation of the condition and the development of symptoms may provoke the following:

  • heavy physical activity and lifting of weights;
  • frequent visits to saunas and baths;
  • constant psychoemotional stresses;
  • hypertonic disease;
  • binge eating;
  • alcoholism;
  • bad habits;
  • the tendency to eat foods very hot;
  • the effect of contrasting temperatures on the body;
  • childbirth;
  • coughing.
Bad habits are a factor complicating treatment and reliable examination

Symptoms do not always occur, but if they develop, they require diagnosis and attention of the doctor.

Symptoms of paroxysmal tachycardia

Symptoms develop periodically and have the nature of seizures. At intervals between them, the patient feels, as usual, and does not experience any abnormal sensations.


Attention! If the heart rate does not exceed 120 beats per minute, there is no cause for concern. But when it reaches 180 or more strokes, it is important to constantly monitor your condition.


In the presence of provoking factors, the following symptoms may appear:

  • Attacks develop suddenly, for no apparent reason;
  • a person feels a strong palpitation, which causes him discomfort;
  • there is a strong weakness and rapid fatigue;
  • sweat on the skin;
  • limbs are cooled;
  • skin on face either turns red or turns pale;
  • The patient experiences a feeling of lack of oxygen, which can be accompanied by fear of death;
  • there is burning in the heart zone, a feeling of tightness in the sternum.

Attention! If there are some of the above symptoms, to prevent the development of complications, you need to go to the hospital, and it is better to call an ambulance.


Diagnostic measures

After a full-time examination, the doctor may recommend an additional examination. Symptoms can not be determined precisely. Electrocardiography, ultrasound of the heart, transesophageal EFI are performed. What kind of procedures are needed, the doctor decides.

Having received the results of the cardiogram, the doctor will pay attention to different segments, including the interval pq. Based on the findings, he can diagnose and prescribe treatment.

Treatment should be prescribed only by a highly qualified specialist

It is difficult to predict the patient's condition with a shortening of the pq interval on the ECG. If there is no symptomatic of paroxysmal tachycardia, the patient is healthy, and only ECG changes are visible, the prognosis is favorable.

The best advice for this pathology is to take care of your health and periodically undergo a preventive examination with a good cardiologist. So you can notice the negative changes in the results of the electrocardiogram on time and take appropriate measures.

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