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Cor triatriatrum

In cor triatriatrum, the left atrium is divided into two chambers by a septum with a central opening of variable size. In pathological haemodynamic terms, the condition corresponds to mitral stenosis. The severity of the disease depends especially on the size of the opening dividing the atrium. The degree of resulting pulmonary hypertension determines the timing of operation.

Using the heart-lung machine, the left atrium is opened and the membrane is resected. The long-term result of the operation depends on the degree of pulmonary hypertension and how well it can regress.