Syndrome of CLC (LGL)
Contents:
- Description
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Description:
L–G–L syndrome (Launa – Ganonga – Levin), or CLC (Klerk – Levi – Kristesko) is characterized by shortening of interval PQ (PQ<0,12 с), нормальной формой и продолжительностью комплекса QRS и наклонностью к приступам суправентрикулярных тахиаритмий. При этом синдроме возбуждение, по-видимому, обходит атриовентрикулярный узел по пучку Джеймса и отсутствует задержка в проведении импульса по атриовентрикулярному узлу, существующая в норме, что и приводит к укорочению интервала PQ. Распространение возбуждения по желудочкам при синдроме L–G–L не нарушено, поэтому комплекс QRS, сегмент ST и зубец Т не изменены. Для выяснения природы наблюдаемых при этом изменений может помочь ЭКГ пучка Гиса. Синдром L–G–L отмечается преимущественно у мужчин среднего возраста при отсутствии органических заболеваний сердца.
It is established that shortening of interval PQ (PQ less than 0,11 c) is observed at 2% of healthy people. The short interval of PQ can be at a hypovitaminosis In (a beriberi disease), a hyperthyroidism, an arterial hypertension, active rheumatism, a myocardial infarction, chronic coronary heart disease, a hyperexcitability of heart, etc. According to D.F. Presnyakov, N. A. Dolgoplosk, the shortened interval of PQ can be a precursory symptom of chronic coronary heart disease.
Premature excitement of ventricles quite often is a part of manifestations of syndromes of W-P-W or L-G-L. However these terms are not synonyms.
It is necessary to consider that attacks of paroxysmal tachyarrhythmias which usually are absent at the isolated shortening of an interval of PQ are characteristic of patients with syndromes of W-P-W and L-G-L. Theoretically any kind of dysfunction of an atrioventricular node which normal carries out a delay of carrying out excitement to ventricles leads to shortening of an interval of PQ.
The main distinction between syndromes of W-P-W and L-G-L is a form of the QRS complex, normal at L–G–L syndrome. Sick both groups have a bent to emergence of paroxysmal tachyarrhythmias. At most of these patients symptoms of a heart disease are absent or are poorly expressed.