User profiles for "author:Johanna Helenius"
Johanna HeleniusLahey, Univ of Helsinki; Martinos Center, Harvard University, BIDMC, UMASS Verified email at lahey.org Cited by 2434 |
Diffusion-weighted MR imaging in normal human brains in various age groups
J Helenius, L Soinne, J Perkiö… - American journal …, 2002 - Am Soc Neuroradiology
BACKGROUND AND PURPOSE: Few studies have concerned the absolute apparent
diffusion coefficient (ADC) values in the normal human brain and the effect of aging on …
diffusion coefficient (ADC) values in the normal human brain and the effect of aging on …
Prognosis and safety of anticoagulation in intracranial artery dissections in adults
TM Metso, AJ Metso, J Helenius, E Haapaniemi… - Stroke, 2007 - Am Heart Assoc
Background and Purpose—To characterize different forms of intracranial artery dissections
(IADs), and to test the assumption that IADs are frequently associated with subarachnoid …
(IADs), and to test the assumption that IADs are frequently associated with subarachnoid …
Cerebral hemodynamics in asymptomatic and symptomatic patients with high-grade carotid stenosis undergoing carotid endarterectomy
L Soinne, J Helenius, T Tatlisumak, E Saimanen… - Stroke, 2003 - Am Heart Assoc
Background and Purpose—Asymptomatic patients with carotid stenosis benefit less from
carotid endarterectomy (CEA) than symptomatic patients because the risk of embolic events …
carotid endarterectomy (CEA) than symptomatic patients because the risk of embolic events …
Cerebral hemodynamics in a healthy population measured by dynamic susceptibility contrast MR imaging
J Helenius, J Perkiö, L Soinne, L Østergaard… - Acta …, 2003 - Taylor & Francis
Purpose: To establish reference data and to study age-dependency for cerebral perfusion in
various regions of the brain in a healthy population. Material and Methods: Eighty healthy …
various regions of the brain in a healthy population. Material and Methods: Eighty healthy …
Atrial fibrillation is associated with a worse 90-day outcome than other cardioembolic stroke subtypes
Background and Purpose—Patients with a cardioembolic stroke (CES) have worse
outcomes than stroke patients with other causes of stroke. Among patients with CES, atrial …
outcomes than stroke patients with other causes of stroke. Among patients with CES, atrial …
Concurrent acute brain infarcts in patients with monocular visual loss
Objective: Embolism from a proximal source to the retinal circulation could be a sign of
embolism from the same source to the hemispheric circulation. We sought to determine the …
embolism from the same source to the hemispheric circulation. We sought to determine the …
Assessment of the predictive validity of etiologic stroke classification
EM Arsava, J Helenius, R Avery, MH Sorgun… - JAMA …, 2017 - jamanetwork.com
Importance The ability of present-day etiologic stroke classification systems to generate
subtypes with discrete stroke characteristics is not known. Objective To test the hypothesis …
subtypes with discrete stroke characteristics is not known. Objective To test the hypothesis …
Acid-suppressive medications and risk of pneumonia in acute stroke patients: A systematic review and meta-analysis
Goal We performed a systematic review and meta-analysis aiming to clarify the relationship
between acid-suppressive medication (ASM) and the risk of pneumonia in acute stroke …
between acid-suppressive medication (ASM) and the risk of pneumonia in acute stroke …
Leukoaraiosis burden significantly modulates the association between infarct volume and National Institutes of Health Stroke Scale in ischemic stroke
J Helenius, N Henninger - Stroke, 2015 - Am Heart Assoc
Background and Purpose—The National Institutes of Health Stroke Scale (NIHSS) provides
a reliable, quantitative measure of ischemic stroke severity and is predicted by the infarct …
a reliable, quantitative measure of ischemic stroke severity and is predicted by the infarct …
Stroke Genetics Network (SiGN) study: design and rationale for a genome-wide association study of ischemic stroke subtypes
JF Meschia, DK Arnett, H Ay, RD Brown Jr… - Stroke, 2013 - Am Heart Assoc
Background and Purpose—Meta-analyses of extant genome-wide data illustrate the need to
focus on subtypes of ischemic stroke for gene discovery. The National Institute of …
focus on subtypes of ischemic stroke for gene discovery. The National Institute of …