An arterial system, comprising an arterial flow exchange system and a controller, for use with a patient having an aorta and a body blood circulation system, wherein: said arterial flow exchange system comprises a distal portion arrangement configured for being accommodated in the aorta of the patient in use of the arterial flow exchange system, said distal portion arrangement comprising: a perfusion lumen arrangement having at least one perfusion outlet and connectable to at least one perfusion source, said perfusion lumen arrangement being configured for providing therethrough a target perfusion flow into the aorta having a target perfusion flow rate that is greater than a nominal perfusion flow rate by an excess perfusion flow rate, wherein said nominal perfusion flow is sufficient for providing adequate fluid flow to the body blood circulation system of the patient; and a suction lumen arrangement having at least one suction inlet and connectable to a suction source, said suction lumen arrangement being configured for providing a suction flow out of the aorta, said suction flow having a suction flow rate; said distal portion being configured for providing fluid communication between at least one said perfusion outlet and at least one said suction inlet within the aorta via an outside of said distal portion, in use of the arterial system; said controller being configured, in use of the arterial system, for: selectively controllably providing a target perfusion flow into the aorta at said target perfusion flow rate; selectively controllably providing a suction flow out of the aorta at said suction flow rate; and selectively controlling said target perfusion flow rate and said suction flow rate concurrently to cause embolic debris that may be present in the aorta to be diverted to said at least one suction inlet. said arterial flow exchange system comprises a distal portion arrangement configured for being accommodated in the aorta of the patient in use of the arterial flow exchange system, said distal portion arrangement comprising: a perfusion lumen arrangement having at least one perfusion outlet and connectable to at least one perfusion source, said perfusion lumen arrangement being configured for providing therethrough a target perfusion flow into the aorta having a target perfusion flow rate that is greater than a nominal perfusion flow rate by an excess perfusion flow rate, wherein said nominal perfusion flow is sufficient for providing adequate fluid flow to the body blood circulation system of the patient; and a suction lumen arrangement having at least one suction inlet and connectable to a suction source, said suction lumen arrangement being configured for providing a suction flow out of the aorta, said suction flow having a suction flow rate; said distal portion being configured for providing fluid communication between at least one said perfusion outlet and at least one said suction inlet within the aorta via an outside of said distal portion, in use of the arterial system; a perfusion lumen arrangement having at least one perfusion outlet and connectable to at least one perfusion source, said perfusion lumen arrangement being configured for providing therethrough a target perfusion flow into the aorta having a target perfusion flow rate that is greater than a nominal perfusion flow rate by an excess perfusion flow rate, wherein said nominal perfusion flow is sufficient for providing adequate fluid flow to the body blood circulation system of the patient; and a suction lumen arrangement having at least one suction inlet and connectable to a suction source, said suction lumen arrangement being configured for providing a suction flow out of the aorta, said suction flow having a suction flow rate; said distal portion being configured for providing fluid communication between at least one said perfusion outlet and at least one said suction inlet within the aorta via an outside of said distal portion, in use of the arterial system; said controller being configured, in use of the arterial system, for: selectively controllably providing a target perfusion flow into the aorta at said target perfusion flow rate; selectively controllably providing a suction flow out of the aorta at said suction flow rate; and selectively controlling said target perfusion flow rate and said suction flow rate concurrently to cause embolic debris that may be present in the aorta to be diverted to said at least one suction inlet. selectively controllably providing a target perfusion flow into the aorta at said target perfusion flow rate; selectively controllably providing a suction flow out of the aorta at said suction flow rate; and selectively controlling said target perfusion flow rate and said suction flow rate concurrently to cause embolic debris that may be present in the aorta to be diverted to said at least one suction inlet.