Thrombosis of Prosthetic Cardiac Valve: Difficulties of Diagnostics on the Example of a Clinical Case with Lethal Outcome

The article describes the clinical observation of thrombosis of prosthetic cardiac valve in a 51-year-old female patient, 9 years after surgical intervention for a degenerative aortic valve disease with the installation of mechanical prosthesis into the aortal position and further warfarin medication, with absence of international normalized ratio (INR) control over the past six months. The patient's condition worsened under the "mask" of decompensation of left ventricular circulatory failure; pulmonary embolism and acute coronary syndrome were also excluded. At the same time, the negative dynamics of the cardiac ultrasound data were underestimated: the appearance of prosthetic dysfunction, an increase in the degree of valve regurgitation, severe pulmonary hypertension, as well as anamnestic data (double acute cerebrovascular accident and lack of INR control for a long time, lability of its values during index hospitalization).This case can be important in terms of clarifying the reasons for the decompensation of chronic cardiac failure in patients with valvular defects and mechanical valve prosthetics, especially in cases of irregular INR monitoring or not being it in the target range, and progressive negative dynamics of the cardiac ultrasound data.