Effect of Reperfusion in Acute Ischemia and Infarction1

2015 ◽  
pp. 132-139
Author(s):  
William B. Hood
Keyword(s):  
Acute Ischemia

Minocycline inhibits mTOR signaling activation and alleviates behavioral deficits in the Wistar rats with acute ischemia stroke

2020 ◽  
Vol 19 ◽  
Author(s):  
Shengyuan Wang ◽  
Chuanling Wang ◽  
Lihua Wang ◽  
Zhiyou Cai
Keyword(s):  
Cerebral Ischemia ◽  
Ischemia Reperfusion ◽  
Mammalian Target Of Rapamycin ◽  
Mtor Signaling ◽  
Acute Ischemia ◽  
Intragastric Administration ◽  
Underlying Mechanisms ◽  
Signaling Activation ◽  
The Brain ◽  
Minocycline Therapy

Background: Mammalian target of rapamycin (mTOR) has been evidenced as a multimodal therapy in the path-ophysiological process of acute ischemic stroke (AIS). However, the pathway that minocycline targets mTOR signaling is not fully defined in the AIS pathogenesis. This study is to aim at the effects of minocycline on the mTOR signaling in the AIS process and further discover the underlying mechanisms of minocycline involved in the following change of mTOR signaling-autophagy. Methods: Cerebral ischemia/reperfusion (CIR) rat animal models were established with the transient suture occlusion into middle cerebral artery. Minocycline (50mg/kg) was given by intragastric administration. The Morris water maze was used to test the cognitive function of animals. Immunohistochemistry and immunofluorescence were introduced for testing the lev-els of synaptophysin and PSD-95. Western blot was conducted for investigating the levels of mTOR, p-mTOR (Ser2448), p70S6, p-p70S6 (Thr389), eEF2k, p-eEF2k (Ser366), p-eIF4B (Ser406), LC3, p62, synaptophysin and PSD-95. Results: Minocycline prevents cognitive decline of the MCAO stroke rats. Minocycline limits the expression of p-mTOR (Ser2448) and the downstream targets of mTOR [p70S6, p-p70S6 (Thr389), eEF2k, p-eEF2k (Ser366) and p-eIF4B (Ser406)] (P<0.01), while minocycline has no influence on mTOR. LC3-II abundance and the LC3-II/I ratio were upregu-lated in the hippocampus of the MCAO stroke rats by the minocycline therapy (P<0.01). p62 was downregulated in the hippocampus from the MCAO stroke rats administrated with minocycline therapy(P<0.01). The levels of SYP and PSD-95 were up-regulated in the brain of the MCAO stroke rats administrated with minocycline therapy. Conclusion: Minocycline prevents cognitive deficits via inhibiting mTOR signaling and enhancing autophagy process, and promoting the expression of pre-and postsynaptic proteins (synaptophysin and PSD-95) in the brain of the MCAO stroke rats. The potential neuroprotective role of minocycline in the process of cerebral ischemia may be related to mitigating is-chemia-induced synapse injury via inhibiting activation of mTOR signaling.

Ayurvedic management of Ischemic Gangrene due to Diabetes Mellitus - A Case Report

2017 ◽  
Vol 2 (3) ◽  
Author(s):  
Vikram S. ◽  
Saraswathi Devi H.N.
Keyword(s):  
Diabetes Mellitus ◽  
Upper Limb ◽  
Medical Science ◽  
Limb Ischemia ◽  
Interesting Case ◽  
Therapeutic Interventions ◽  
Acute Ischemia ◽  
Arterial Circulation ◽  
Ct Angiogram ◽  
Choice Of Treatment

Medical science says that ischemia is a common complication in Diabetes, especially in the lower limb but this is a case presenting ischemic changes in upper limb which is unique and also in such type of acute ischemia amputation is the only choice of treatment to save the life of patient from septicaemia. Such a rare and interesting case was taken at Sri Sri Ayurveda Hospital and handled by proper Ayurvedic line of treatment by which circulation is re-established which saved both limb and life of patient. A patient by name Sundaramma, 62yr Female, visited Sri Sri Ayurveda Hospital on 29/2/2016 with a diagnosis of Right upper limb Ischemia with Diabetes Mellitus and Active TB. The main symptoms were severe pain and burning sensation in Right hand and forearm, discolouration of fingers with ulcers, Bluish black discolouration over right thumb, necrosis, pus dischargeand stiffness, associated with difficulty in movement of right arm, shoulder joint, elbow joint, palm and fingers. Diagnosed as Right Upper Limb Ischemia with Diabetes Mellitus and active TB. Therapeutic interventions like Right upper limb Doppler and CT angiogram were done. Such a complicated case was taken at Sri Sri Ayurveda Hospital, and carefully handled by Ayurvedic methods of management, which was ended up by preventing amputation of the limb and also achieving the re-establishment of arterial circulation.

BDNF and NGF Afford in vitro Neuroprotection against Ethanol Combined with Acute Ischemia and Chronic Hypoglycemia

1999 ◽  
Vol 21 (1) ◽  
pp. 68-75 ◽  
Author(s):  
J.Jean Mitchell ◽  
Michael Paiva ◽  
DonW. Walker ◽  
MarietaBarrow Heaton
Keyword(s):  
Acute Ischemia

scholarly journals Pure Motor Stroke Secondary to Cerebral Infarction of Recurrent Artery of Heubner after Mild Head Trauma: A Case Report

2016 ◽  
Vol 4 (1) ◽  
pp. 139-141
Author(s):  
Ali Yilmaz ◽  
Zahir Kizilay ◽  
Ayca Ozkul ◽  
Bayram Çirak
Keyword(s):  
Ischemic Stroke ◽  
Head Trauma ◽  
Distal Part ◽  
Brain Mri ◽  
Artery Occlusion ◽  
Acute Ischemia ◽  
Post Traumatic ◽  
The Brain ◽  
Perforating Arteries ◽  
Pure Motor

BACKGROUND: The recurrent Heubner's artery is the distal part of the medial striate artery. Occlusion of the recurrent artery of Heubner, classically contralateral hemiparesis with fasciobrachiocrural predominance, is attributed to the occlusion of the recurrent artery of Heubner and is widely known as a stroke syndrome in adults. However, isolated occlusion of the deep perforating arteries following mild head trauma also occurs extremely rarely in childhood.CASE REPORT: Here we report the case of an 11-year-old boy with pure motor stroke. The brain MRI showed an acute ischemia in the recurrent artery of Heubner supply area following mild head trauma. His fasciobrachial hemiparesis and dysarthria were thought to be secondary to the stretching of deep perforating arteries leading to occlusion of the recurrent artery of Heubner.CONCLUSION: Post-traumatic pure motor ischemic stroke can be secondary to stretching of the deep perforating arteries especially in childhood.

Modeling of disturbances in electrical and mechanical function of cardiomyocytes under acute ischemia

BIOPHYSICS ◽  
2014 ◽  
Vol 59 (5) ◽  
pp. 791-799
Author(s):  
N. A. Vikulova ◽  
A. D. Vasilyeva ◽  
D. E. Zamaraev ◽  
O. E. Solovyova ◽  
V. S. Markhasin
Keyword(s):  
Acute Ischemia ◽  
Mechanical Function

scholarly journals MR Detection of Cortical Spreading Depression Immediately after Focal Ischemia in the Rat

1996 ◽  
Vol 16 (2) ◽  
pp. 214-220 ◽  
Author(s):  
Joachim Röther ◽  
Alexander J. de Crespigny ◽  
Helen D'Arceuil ◽  
Michael E. Moseley
Keyword(s):  
Cortical Spreading Depression ◽  
Spreading Depression ◽  
Tissue Perfusion ◽  
Artery Occlusion ◽  
Acute Ischemia ◽  
Planar Imaging ◽  
Mr Perfusion Imaging ◽  
Before And After ◽  
Apparent Diffusion ◽  
Cortical Regions

The suture model for middle cerebral artery occlusion (MCAO) was used to induce acute ischemia in rats remotely within a magnetic resonance (MRI) scanner. Serial MR diffusion weighted imaging (DWI) was performed during remote MCAO using an echo planar imaging technique. MR perfusion imaging was performed before and after occlusion using the bolus tracking technique. Transient apparent diffusion coefficient (ADC) changes were detected in six of seven rats as early as 2.7 ± 1.5 min post MCAO. ADC values declined transiently to 70.1 ± 6.0% of control and recovered to 95.5 ± 6.8% of control within 3.3 ± 2.9 min. These ADC changes propagated bidirectionally away from the ischemic core with a speed of 3.0 ± 1.1 mm/min. Transient ADC decreases only occurred in ischemic areas characterized by moderately decreased tissue perfusion. Propagation toward cortical regions with severe tissue perfusion deficits was not detected. DWI can detect the earliest dynamic, reversible ADC changes in the ischemic tissue. The speed of propagation of the decreasing ADC wave, the waveform characteristics, and the occurrence in moderately perturbated tissue are compatible with cortical spreading depression.

scholarly journals Effects of digitalis on subendocardial and subepicardial dysfunction during acute ischemia.

Circulation ◽  
1982 ◽  
Vol 65 (7) ◽  
pp. 1315-1320 ◽  
Author(s):  
V S Banka ◽  
H Yamazaki ◽  
J B Agarwal ◽  
M M Bodenheimer ◽  
R H Helfant
Keyword(s):  
Acute Ischemia

Abstract TP476: White Matter Hyperintensity Burden is Associated With Poor Collateral Flow and Worse Outcomes in an Acute Ischemic Stroke Cohort

Stroke ◽  
2020 ◽  
Vol 51 (Suppl_1) ◽  
Author(s):  
Rami-James Assadi ◽  
Hongyu An ◽  
Yasheng Chen ◽  
Andria Ford ◽  
Jin-Moo Lee
Keyword(s):  
Ischemic Stroke ◽  
White Matter ◽  
Acute Ischemic Stroke ◽  
Pearson Correlation ◽  
Stroke Onset ◽  
White Matter Hyperintensity ◽  
Flow Index ◽  
Acute Ischemia ◽  
Collateral Flow ◽  
Core Volume

Introduction: White matter hyperintensity volume (WMHv), a quantitative neuroimaging biomarker of cerebral small vessel disease (CSVD), is associated worse outcomes after ischemic stroke. In this study, we hypothesized that worse outcomes in CSVD patients were due to poor collateral flow during acute ischemia. Methods: 47 patients with acute ischemic stroke (AIS) were prospectively enrolled in this study. Serial MRIs were performed at 3 hours and 30 days after stroke onset. 3-hour FLAIR images were used to determine WMHv, after manually delineating lesions with MIPAV. An index of collateral flow (delayed perfusion to the penumbra) was determined by subtracting core volume (volume of tissue with ADC<600) from the volume of brain tissue with Tmax>2. Patient’s NIHSS was scored at 3 hours and 30 days after stroke onset and the difference was calculated (ΔNIHSS). Log-transformed WMHv was correlated to ΔNIHSS and the collateral flow index, using Pearson correlation. Results: Mean age = 63.9 years (SD 13.5); 37% female; median 3-hour NIHSS = 13 (IQR 6.5-20); median change in NIHSS between 3h and 30d = 4 (IQR: 0-7); median core volume = 13cm3 (IQR 4.3-35.6); median WMHv = 1.257cm3 (IQR 641-3595). WMHv was associated with reduced improvement in ΔNIHSS (R=-0.42, ρ=0.005). Furthermore, WMHv demonstrated a trend for association with poor collateral flow (R=-0.28, ρ=0.062). In this dataset, we will explore the relationship between WMHv and other tissue-based metrics of collateral flow, including the hypoperfusion intensity ratio (HIR) and the cerebral blood volume ratio (rCBV). Conclusions: Our study confirms that patients with CSVD have worse outcomes after AIS. The data also raise the possibility that these worse outcomes in CSVD patients may be mediated by compromised collateral flow in the setting of acute ischemia.

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