[The U-wave in ischemia and left ventricular dysfunction after myocardial infarct].

Introduction: The occurrence of U-wave in electrocardiogram appears after T-wave. It is period of the greatest excitability of the myocardium in heart electrical activity usually of the some direction as its own T-wave. AIM OF THE WORK ANALYSE: U-wave with ischaemia and dysfunction of the myocardium in exercise test.

Material And Methods: The prospective study has been done for 51 patients. Electrocardiogram, exercise test vas made for all patients and immediately after test, echocardiography with Doppler and colour-Doppler. In the analysis of dysfunction of the left chamber these important parameters were followed: METS; decrease of blood pressure, devaluation of ST-segment, U-wave, heart rate, dyspnea, sweating and paleness.

Results: Positive U-wave was noticed in 51%, negative in 24% examinees. Sensitivity of U-wave on the base of the breakdown of segmental vall motion in echocardiography (ischaemia) is 66.67% with false negative resists of 33.33%. Systolic dysfunction with influential parameters correlates in the best way with decrease of blood pressure and regressive coefficient is 66.93, but the weabest correlation is with U-wave (0.53). Correlative coefficient for U-wave in systolic function is 0.263. Regressive coefficient with influential parameters in diastolic dysfunction is 3.34, correlative coefficient is 0.108.

Conclusions: U-wave in registered at rest after exercise test when heart rate is equal or below 95 in a minute. Registration of U-wave is an additional parameter in diagnostics of ischaemia and dysfunction of the myocardium of the left chamber (small influence).