Measuring Blood Flow in Heart Vessels With a New Fibre Optic Sensor

Patients planned for an invasive coronary physiology (pressure-wire) study and who meet the inclusion criteria and none of the exclusion criteria can be enrolled. Participants will undergo preparation for their clinical procedure (angiogram with pressure wire study) in the normal manner. Arterial cannulation will be performed via the radial or femoral artery) under local anaesthesia. The sheath will be inserted and a pre-procedure blood sample taken for Troponin T level. A coronary angiogram will be performed as per standard clinical practice prior to cannulating the coronary artery to be studied. The pressure studies will be performed sequentially, first with a pressure wire before using the iKOs™ microcatheter. Following withdrawal of the iKOs™ microcatheter. A pressure wire assessment is repeated after the microcatheter is withdrawn. The case will then proceed as clinically indicated. Post-procedure the participant will be managed according to standard clinical practice.