Stroke is a major cause of disability because of its motor and cognitive sequelae even when the acute phase of stabilization of vital parameters is overcome. The most important improvements occur in the first 8-12 weeks after stroke, indicating that it is crucial to improve our understanding of the dynamics of phenomena occurring in this time window to prospectively target rehabilitation procedures from the earliest stages after the event. Here, we studied the intracortical excitability properties of delivering transcranial magnetic stimulation (TMS) to the primary motor cortex (M1) of left and right hemispheres in 17 stroke patients who suffered a mono-lateral left hemispheric stroke, excluding pure cortical damage. All patients were studied within 10 days of symptom onset. TMS-evoked potentials (TEPs) were collected via a TMS-compatible electroencephalogram system (TMS-EEG) concurrently with motor-evoked responses (MEPs) induced in the contralateral first dorsal interosseous muscle. Comparison with age-matched healthy volunteers was made by collecting the same bilateral-stimulation data in nine healthy volunteers as controls. Excitability in the acute phase revealed relevant changes in the relationship between left lesioned and contralesionally right hemispheric homologous areas both for TEPs and MEPs. While the paretic hand displayed reduced MEPs compared to the non-paretic hand and to healthy volunteers, TEPs revealed an overexcitable lesioned hemisphere with respect to both healthy volunteers and the contra-lesion side. Our quantitative results advance the understanding of the impairment of intracortical inhibitory networks. The neuronal dysfunction most probably changes the excitatory/inhibitory on-center off-surround organization that supports already acquired learning and reorganization phenomena that support recovery from stroke sequelae.
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http://dx.doi.org/10.3390/brainsci13020233 | DOI Listing |
Int J Exp Pathol
December 2024
Department of Ageing, Rheumatology and Regenerative Medicine, Division of Medicine, The Rayne Building, University College, London, UK.
Using a model of UV-killed E. coli driven dermal inflammation in healthy human volunteers, we originally reported that following inflammatory resolution there was infiltration of macrophages, which, through prostanoids including prostaglandin (PG) E, imprints long-term tissue immunity. In addition to the prostanoids, data on levels of Specialised Pro-Resolution Lipid Mediators (SPMs) throughout inflammatory onset, resolution and post-resolution phases of this model were presented, but as illustrations rather than as primary data.
View Article and Find Full Text PDFWe developed a new sodium magnetic resonance fingerprinting ($^\text{23}\text{Na}$ MRF) method for the simultaneous mapping of $\text{T}_\text{1}$, $\text{T}_\text{2,long}^{*}$, $\text{T}_\text{2,short}^{*}$ and sodium density with built-in $\Delta\text{B}_{1}^{+}$ (radiofrequency transmission inhomogeneities) and $\Delta\text{f}_\text{0}$ corrections (frequency offsets). We based our $^\text{23}\text{Na}$ MRF implementation on a 3D FLORET sequence with 23 radiofrequency pulses. To capture the complex spin ${\frac{\text{3}}{\text{2}}}$ dynamics of the $^\text{23}\text{Na}$ nucleus, the fingerprint dictionary was simulated using the irreducible spherical tensor operators formalism.
View Article and Find Full Text PDFPeerJ
December 2024
Department of Surgery, The Affiliated Hospital of Qingdao University, Qingdao, China.
Background: Recently, there has been increasing interest in the exploration of the association between the hepatitis E virus () infection and malignancies; however, epidemiological data for infection among women with a gynecological tumors (GT) are limited. Herein, we investigated the correlation between and GT in Chinese women.
Methods: We recruited 452 women diagnosed with a primary GT and 452 healthy volunteers to investigate the possible routes and risk factors for infection.
Sex Med
December 2024
Department of Biochemistry, Etlik City Hospital, Ankara, 06170, Turkey.
Background: Sexual dysfunction (SD) due to Selective Serotonin Reuptake Inhibitors (SSRI) use is a common condition encountered by psychiatrists and its etiology has not been fully elucidated.
Aim: To determine the relationship between alpha Melanocyte Stimulating Hormone (α-MSH) and Melanocortin-4 receptor (MCR4) levels and sexual function levels of patients with and without SSRI related SD and control group and to examine whether α-MSH and MCR4 play a role in the etiology of SSRI related SD.
Methods: A total of 92 patients and 49 healthy volunteers who applied to psychiatry outpatient clinic were included in the study.
Cureus
November 2024
Infectious Diseases, Ziauddin University, Karachi, PAK.
Background Venous blood gas (VBG) investigation is a widespread option for arterial blood gas analysis because it is easier to draw and has a lower risk of complications during phlebotomy. This study aimed to establish reference intervals for the accurate analysis of VBG results as there is a lack of published data. Method Dr.
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