Monitoring apparatus and assisted circulation apparatus

A monitoring apparatus for being applied to an assisted circulation apparatus, the assisted circulation apparatus being connected to a living body, transferring blood removed from the living body to a membrane lung by a blood transfer pump, and gas-exchanging and oxygenating the blood in the membrane lung in parallel with a native lung, the monitoring apparatus for monitoring an oxygenation state of blood in the living body, the monitoring apparatus comprising:

• a display;
• at least a memory configured to store programs;
• and
• at least a processor configured to execute the programs to:
• calculate a ratio of a first blood-oxygenated state index to a sum of the first blood-oxygenated state index and a second blood-oxygenated state index, wherein the first blood-oxygenated state index indicates an oxygenation state of blood by the membrane lung, the second blood-oxygenated state index indicates an oxygenation state of blood by the native lung, and the ratio expresses a contribution degree of the assisted circulation apparatus to the living body,
• calculate the first blood-oxygenated state index based on a gas-exchanging amount of blood in the membrane lung,
• calculate the gas-exchanging amount of blood in the membrane lung based on at least one of a carbon dioxide emission amount in the membrane lung and an oxygen uptake amount in the membrane lung,
• calculate the at least one of the carbon dioxide emission amount in the membrane lung and the oxygen uptake amount in the membrane lung using measurement results of a first sensor configured to measure inspiratory gas and expiratory gas of the membrane lung,
• calculate the second blood-oxygenated state index based on a gas-exchanging amount of blood in the native lung,
• calculate the gas-exchanging amount of blood in the native lung based on at least one of a carbon dioxide emission amount in the native lung and an oxygen uptake amount in the living body,
• calculate the at least one of the carbon dioxide emission amount in the native lung and the oxygen uptake amount in the living body using measurement results of a second sensor configured to measure inspiratory gas and expiratory gas of the native lung,
• compare the sum of the first blood-oxygenated state index and the second blood-oxygenated state index with a blood-oxygenated state index indicating an oxygenation state of blood based on metabolism estimated from a weight of the living body, and
• output continuously in real time a result of the comparison to the display for an operator to institute a change in treatment of the living body.