image by: HWN

HWN Suggests

Beyond the Clock: The Pivotal Role of Advanced MRI in Revolutionizing the Diagnosis and Management of Brainstem Stroke

The brainstem, a compact neural structure housing critical life-sustaining nuclei and white matter tracts, presents a unique diagnostic challenge when ischemic injury occurs. Its anatomical complexity and the non-specific nature of presenting symptoms often lead to diagnostic delays or misdiagnosis. Computed tomography is notoriously insensitive to acute brainstem ischemia. This review articulates the indispensable role of advanced magnetic resonance imaging (MRI) as the unequivocal gold standard for diagnosing brainstem stroke.

read full article

Featured

 Stroke protocol (MRI)

CT is still the choice as the first imaging modality in acute stroke institutional protocols, not only because the availability and the easy and fast access to a CT scanner, but also due the better sensitivity for intracerebral hemorrhage (ICH) diagnosis Some institutions also apply a quick MRI stroke protocol for code stroke patients assessment within the narrow time window for thrombolytic therapy.

Articles of Interest

Stroke Warning Signs: How MRI Helps Diagnose Ischemic Stroke Faster

CT scans are fast at detecting bleeding, but for ischemic stroke they have a significant limitation. Research published in PMC shows that non-contrast CT has a sensitivity of only 40–60% for ischemic stroke in the first six hours — missing roughly half of all cases when it matters most. MRI — specifically diffusion-weighted imaging (DWI) — detects the cellular changes that occur within minutes of a blood flow disruption, making ischemic damage visible long before it appears on CT. The same research confirms MRI is approximately five times more sensitive than CT for diagnosing acute ischemic stroke.

A 3-Minute Ultrafast MRI and MRA Protocol for Screening of Acute Ischemic Stroke

Despite its diagnostic superiority, traditional MRI protocols often require significant acquisition time, which may not be appropriate in emergent settings, when timely intervention is paramount. Recently, MR acceleration techniques have been developed to address this limitation

Evidence-based guideline: The role of diffusion and perfusion MRI for the diagnosis of acute ischemic stroke

In patients presenting with acute neurologic impairment, noncontrast CT imaging is used to evaluate for infarct and to exclude hemorrhage and other structural lesions that may mimic stroke. The evidence from our report demonstrates that DWI is accurate and superior to CT for the diagnosis of acute ischemic stroke, relative to clinical and imaging outcomes. However, in clinical practice, the availability and cost of imaging modalities and the requirements of medical management enter into the decision about which test to perform in the acute period.

Magnetic Resonance Imaging in Acute Ischemic Stroke

Multimodal imaging provides useful information for diagnosing ischemic stroke, selecting appropriate patients for thrombolytic therapy, and predicting the prognosis of ischemic stroke. MRI can detect ischemic stroke within the first few hours of stroke onset. Relying solely on one or a few parameters may not be sufficient, but comprehensively aggregating information from each MRI sequence (i.e., DWI, FLAIR, GRE {T2*gradient recalled echo}, and PWI) and using multiple mismatch parameters (DWI-FLAIR mismatch and PWI-DWI mismatch) may be more helpful in establishing the indications for MRI-based thrombolysis

Moving From CT to MRI Paradigm in Acute Ischemic Stroke: Feasibility, Effects on Stroke Diagnosis and Long-Term Outcomes

A paradigm shift from CT to MRI as first-line imaging for AIS seems feasible in a comprehensive stroke center, with a minimally increased delay to imaging in thrombolysis candidates. MRI was associated with reduced thrombolysis rates of stroke mimics and subacute neuroimaging needs.

MRI in acute stroke

Therefore, using MRI as a screening tool for IV tPA decision-making, which, at present, comes at the expense of time and brain, should be approached with utmost caution.

New MRI Analysis Useful in Predicting Stroke Complications Caused by Clot-Busters

Johns Hopkins researchers have developed a new way of looking at standard MRI scans that more accurately measures damage to the blood-brain barrier in stroke victims, a process they hope will lead to safer, more individualized treatment of blood clots in the brain and better outcomes.

The impact of Magnetic Resonance Imaging (MRI) on ischemic stroke detection and incidence: minimal impact within a population-based study

We found that use of MRI did not significantly impact ischemic stroke detection within our population. Our hypothesis had been that MRI would detect milder events and therefore would artifactually increase stroke incidence. However, by comparing a strictly clinical definition (requiring focal deficits referable to a vascular distribution lasting > 24 h) and a physician-judgment definition (which used all available information including imaging results), we found that the amount of strokes “ruled out” was roughly equivalent to the number of strokes “ruled in” by MRI. This has important implications for stroke surveillance studies that monitor trends in stroke incidence and mortality over time within an environment with increasing use of neuroimaging.