A study is presented of the morphological changes of the lymphatic circulation in chronic ischemic heart disease (IHD). Examinations were carried out on clinical material: intraoperative cardiac biopsies and on hearts of patients who died of this disease at the age of 36-59 years. Transmission electron microscopy was used. A clinical comparison was realized of changes of intramyocardial and subepicardial regions of the heart lymph circulation and morphological equivalents of disorders of outflow of lymph from the heart in chronic IHD were evaluated. The obtained data indicate the lymph stasis possessing cardiotoxic and sclerogenous properties is an essential pathogenetic factor of myocardial fibrotization in chronic coronary insufficiency.