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[Value of MRI in intracerebral and subarachnoid hemorrhage]
P D Schellinger1, J Fiebach, A Mohr
1Neurologische Klinik, Universitätsklinikums Heidelberg, Kopfklinik, Im Neuenheimer Feld 400, 69120 Heidelberg. Peter_Schellinger@med.uni-heidelberg.de
Abstract:
Intracranial hemorrhage (ICH) accounts for 15% of all strokes. In hyperacute emergency assessment, CT is the diagnostic standard for differentiating between hyperacute ICH and ischemic stroke. At this stage, MRI is considered to be of little value for the diagnosis of ICH or subarachnoidal hemorrhage (SAH). We review the current literature and characterize the role of MRI in the diagnosis of ICH and SAH as well as hyperacute stroke in general: While MRI is considered superior to CT in the diagnosis of subacute and chronic ICH/SAH, in hyperacute ICH this is still a matter of debate. MRI signal characteristics of ICH depend on hemoglobin degradation. Deoxyhemoglobin is the MRI substrate for demonstration of blood due to its paramagnetic properties causing signal loss on susceptibility weighted images (T2*-WI). Preliminary data, however, suggest that the sensitivity of modern stroke MRI protocols is sufficiently high for hyperacute ICH and SAH and may render additional information with regard to the etiology of ICH or SAH. Further interest is focused on perihemorrhagic pathophysiologic processes, which may help to improve therapeutic decision making in patients with ICH.
Insights
Magnetic resonance imaging (MRI) shows promise for diagnosing hyperacute intracranial hemorrhage (ICH) and subarachnoid hemorrhage (SAH), potentially offering more detail than CT scans in emergency stroke assessment.
Area of Science:
- Neurology
- Radiology
- Medical Imaging
Background:
- Intracranial hemorrhage (ICH) constitutes 15% of all stroke cases.
- Computed tomography (CT) is the current standard for hyperacute stroke assessment, differentiating ICH from ischemic stroke.
- Magnetic resonance imaging (MRI) is traditionally considered less valuable for diagnosing hyperacute ICH and subarachnoid hemorrhage (SAH).
Purpose of the Study:
- To review current literature on the role of MRI in diagnosing hyperacute intracranial hemorrhage (ICH) and subarachnoid hemorrhage (SAH).
- To characterize the diagnostic capabilities of MRI compared to CT in hyperacute stroke scenarios.
- To explore the potential of MRI in identifying the etiology and perihemorrhagic processes of ICH/SAH.
Main Methods:
- Literature review of studies investigating MRI for hyperacute ICH and SAH.
- Analysis of MRI signal characteristics related to hemoglobin degradation in ICH.
- Evaluation of susceptibility-weighted imaging (T2*-WI) for detecting deoxyhemoglobin.
Main Results:
- While MRI is superior for subacute/chronic ICH/SAH, its role in hyperacute ICH is debated.
- Deoxyhemoglobin, a product of hemoglobin degradation, is detectable via MRI's susceptibility-weighted images (T2*-WI) due to signal loss.
- Preliminary data suggest modern MRI protocols are sensitive enough for hyperacute ICH/SAH detection and may reveal etiological information.
Conclusions:
- MRI's utility in diagnosing hyperacute ICH is an evolving area, with emerging evidence supporting its effectiveness.
- Advanced MRI techniques, particularly T2*-WI, can detect hyperacute blood based on deoxyhemoglobin.
- Further research into MRI's ability to elucidate perihemorrhagic pathophysiology could enhance therapeutic decision-making for ICH patients.