Publications by authors named "Kotomi Iwata"
Purpose: The turbulent kinetic energy (TKE) estimation based on 4D flow MRI has been currently developed and can be used to estimate the pressure gradient. The objective of this study was to validate the clinical value of 4D flow-based TKE measurement in patients with hypertrophic cardiomyopathy (HCM).
Methods: From April 2018 to March 2019, we recruited 28 patients with HCM.
Article Synopsis
- The study investigates the high-attenuating crescent (HAC) sign on CT scans as an indicator for aortic aneurysm (AA) rupture risk, analyzing its CT-attenuation values among different patient groups.
- A total of 76 patients were classified into three groups based on their AA status: rupture, impending rupture, and non-rupture, with significant differences in HAC sign values observed between these groups.
- The research found optimal cut-off values for distinguishing between impending rupture and non-rupture cases, indicating the HAC sign could be a useful tool in predicting aortic aneurysm outcomes.
Background: The hemodynamic changes after superficial temporal artery (STA) to middle cerebral artery (MCA) bypass surgery are unclear.
Objective: To clarify the hemodynamics by comparing flow parameters obtained by 4-dimensional (4D) flow magnetic resonance imaging (MRI) and intraoperative MCA pressure measurement.
Methods: We recruited 23 patients who underwent STA-MCA bypass surgery for internal carotid artery (ICA) or MCA stenosis.
Purpose: MRI-based risk stratification should be established to identify patients with internal carotid artery stenosis (ICS) who require further PET or SPECT evaluation. This study assessed whether multiparametric flow analysis using time-resolved 3D phase-contrast (4D flow) MRI can detect cerebral hemodynamic impairment in patients with ICS.
Methods: This retrospective study analyzed 26 consecutive patients with unilateral ICS (21 men; mean age, 71 years) who underwent 4D flow MRI and acetazolamide-stress brain perfusion SPECT.
Article Synopsis
- A 72-year-old male experienced an abdominal aortic aneurysm (AAA) rupture years after an endovascular aneurysm repair that involved a Zenith stent-graft, highlighting a rare complication linked to stent migration.
- Follow-up CT scans revealed an initial issue with disconnection of the stent leading to a type Ia endoleak, which was resolved with additional stents; however, the patient later suffered from abdominal pain due to a new rupture linked to the migration of the original stent.
- The situation emphasizes the necessity for medical professionals to monitor long-term risks associated with stent-grafts, particularly the potential for AAA rupture from late stent migration.
Background: The hemodynamic changes that occur after high-flow (extracranial-intracranial) EC-IC bypass surgery with internal carotid artery (ICA) ligation are not well known.
Objective: To assess blood flow changes after high-flow EC-IC bypass with ICA ligation by time-resolved 3-dimensional phase-contrast (4D Flow) magnetic resonance imaging (MRI).
Methods: We enrolled 11 patients who underwent high-flow EC-IC bypass.