Computed Tomography Cerebral Perfusion Analysis (CTP)

CTP with automated post-processing is considered medically necessary to aid selection for endovascular thrombectomy in acute ischemic stroke from unilateral proximal anterior circulation LVO when patients meet DAWN (6–24 h window; NIHSS ≥10; prestroke mRS ≤1) or DEFUSE 3 (6–16 h window; NIHSS ≥6; prestroke mRS ≤2) inclusion criteria and have LVO demonstrated on vascular imaging. CTP is contraindicated in patients with renal failure or serious iodine allergy refractory to pretreatment, and results may be unreliable in the presence of motion, poor bolus, hemodynamic or chronic anatomic confounders. Documentation must include baseline mRS, NIHSS, last known well time, LVO imaging, renal/allergy status, and the automated software used with any manual corrections and clinician interpretation.

"CTP with automated post-processing is medically reasonable and necessary for patients with acute ischemic stroke (AIS) caused by a unilateral large vessel occlusion (LVO) in the proximal anterior c..."