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ischaemic preconditioning

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https://www.readbyqxmd.com/read/28399634/prognostic-impact-of-physical-activity-prior-to-myocardial-infarction-case-fatality-and-subsequent-risk-of-heart-failure-and-death
#1
Hanne Ejlersen, Zorana Jovanovic Andersen, My Catarina von Euler-Chelpin, Pernille Palm Johansen, Peter Schnohr, Eva Prescott
Background Animal studies indicate that exercise reduces myocardial damage during myocardial infarction by ischaemic preconditioning. Aim To determine from a prospective cohort study whether the level of leisure time physical activity (LTPA) in humans prior to myocardial infarction could modify the course of myocardial infarction by reducing case fatality and the subsequent risk of heart failure and mortality. Methods A total of 14,223 participants in the Copenhagen City Heart Study were assessed at baseline in 1976-1978; 1,664 later developed myocardial infarction (mean age at myocardial infarction 70...
January 1, 2017: European Journal of Preventive Cardiology
https://www.readbyqxmd.com/read/28381098/remote-preconditioning-and-vascular-surgery
#2
Donagh A Healy, Stewart R Walsh
Remote ischemic preconditioning (RIPC) is a theoretically attractive strategy for organ protection; and phase 2 studies in a variety of settings have yielded promising results. In this article, we review the existing clinical studies on RIPC in vascular surgery. We examine aspects of design that may potentially be optimized in future vascular surgery studies and we highlight some challenges that have emerged since the publication of the Remote Ischaemic Preconditioning for Heart Surgery (RIPHeart) trial and the Effect of Remote Ischaemic Preconditioning on Clinical Outcomes in Patients Undergoing Coronary Artery Bypass Surgery (ERICCA) trial...
January 1, 2017: Journal of Cardiovascular Pharmacology and Therapeutics
https://www.readbyqxmd.com/read/28374977/hypoxic-preconditioning-induced-autophagy-enhances-survival-of-engrafted-endothelial-progenitor-cells-in-ischaemic-limb
#3
Pei Zhou, Yu-Zhen Tan, Hai-Jie Wang, Guo-Dong Wang
Recent clinical studies have suggested that endothelial progenitor cells (EPCs) transplantation provides a modest benefit for treatment of the ischaemic diseases such as limb ischaemia. However, cell-based therapies have been limited by poor survival of the engrafted cells. This investigation was designed to establish optimal hypoxia preconditioning and evaluate effects of hypoxic preconditioning-induced autophagy on survival of the engrafted EPCs. Autophagy of CD34(+) VEGFR-2(+) EPCs isolated from rat bone marrow increased after treatment with 1% O2 ...
April 4, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28374972/ventilation-strategy-has-a-major-influence-on-remote-ischaemic-preconditioning-in-mice
#4
Sean M Davidson, Zhenhe He, Alex Dyson, Daniel I Bromage, Derek M Yellon
Whether oxygen should be administered acutely during ST-segment elevation myocardial infarction is debated. Despite this controversy, the possible influence of supplementary oxygen on animal models of ischaemia-reperfusion injury or cardioprotection is rarely considered. We used an in vivo mouse model of ischaemia and reperfusion to investigate the effect of ventilation with room air versus 100% oxygen. The coronary artery of anaesthetized mice was occluded for 40 min. followed by 2-hrs reperfusion. Infarct size was measured by tetrazolium staining and expressed as a percentage of area at risk, determined using Evan's blue...
April 4, 2017: Journal of Cellular and Molecular Medicine
https://www.readbyqxmd.com/read/28361977/myocardial-stress-and-autophagy-mechanisms-and-potential-therapies
#5
REVIEW
Lea M D Delbridge, Kimberley M Mellor, David J Taylor, Roberta A Gottlieb
Autophagy is a ubiquitous cellular catabolic process responsive to energy stress. Research over the past decade has revealed that cardiomyocyte autophagy is a prominent homeostatic pathway, important in adaptation to altered myocardial metabolic demand. The cellular machinery of autophagy involves targeted direction of macromolecules and organelles for lysosomal degradation. Activation of autophagy has been identified as cardioprotective in some settings (that is, ischaemia and ischaemic preconditioning). In other situations, sustained autophagy has been linked with cardiopathology (for example, sustained pressure overload and heart failure)...
March 31, 2017: Nature Reviews. Cardiology
https://www.readbyqxmd.com/read/28329336/remote-ischaemic-preconditioning-reduces-acute-kidney-injury-in-adult-patients-undergoing-cardiac-surgery-with-cardiopulmonary-bypass-a-meta-analysis
#6
Bin Yi, Xiang Chen, Han Shi, Tiao Lin, Haifeng Lin, Yi Xu, Jian Rong
This article represents the first attempt to perform a pooled analysis about remote ischaemic preconditioning (RIPC) in reduction of acute kidney injury (AKI) of adult patients undergoing cardiac surgery with cardiopulmonary bypass (CPB). A systematic search was performed using PubMed (1966-5 January 2016), the Cochrane Library (1996-5 January 2016), the Web of Science (1986-5 January 2016) and Chinese database (SinoMed) (1978-5 January 2016) to identify studies that have described the effect of RIPC on AKI in adult patients undergoing cardiac surgery with CPB...
April 1, 2017: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/28329231/cardiac-protective-effects-of-remote-ischaemic-preconditioning-in-children-undergoing-tetralogy-of-fallot-repair-surgery-a-randomized-controlled-trial
#7
Qingping Wu, Tingting Wang, Shiqiang Chen, Quanjun Zhou, Haobo Li, Na Hu, Yinglu Feng, Nianguo Dong, Shanglong Yao, Zhengyuan Xia
Aims: Remote ischaemic preconditioning (RIPC) by inducing brief ischaemia in distant tissues protects the heart against myocardial ischaemia-reperfusion injury (IRI) in children undergoing open-heart surgery, although its effectiveness in adults with comorbidities is controversial. The effectiveness and mechanism of RIPC with respect to myocardial IRI in children with tetralogy of Fallot (ToF), a severe cyanotic congenital cardiac disease, undergoing open heart surgery are unclear. We hypothesized that RIPC can confer cardioprotection in children undergoing ToF repair surgery...
February 18, 2017: European Heart Journal
https://www.readbyqxmd.com/read/28302152/myocardial-susceptibility-to-ischaemia-reperfusion-in-obesity-a-re-evaluation-of-the-effects-of-age
#8
I Webster, R Salie, E Marais, W-J Fan, G Maarman, B Huisamen, A Lochner
BACKGROUND: Reports on the effect of age and obesity on myocardial ischaemia/reperfusion (I/R) injury and ischaemic preconditioning are contradictory. The aim of this study was to re-evaluate the effects of age and diet-induced obesity (DIO) on myocardial I/R injury and preconditioning potential. METHODS: Four groups of Wistar male rats were used: age-matched controls (AMC) receiving standard rat chow for (i) 16 weeks and (ii) 16 months respectively; DIO rats receiving a sucrose-supplemented diet for (iii) 16 weeks and (iv) 16 months respectively...
March 17, 2017: BMC Physiology
https://www.readbyqxmd.com/read/28260986/impact-of-remote-ischaemic-preconditioning-on-cerebral-oxygenation-during-total-knee-arthroplasty
#9
Chung-Sik Oh, Seong-Hyop Kim, Jaemoon Lee, Ka Young Rhee
Background: Ischaemic reperfusion injury (IRI) after tourniquet release during total knee arthroplasty (TKR) is related to postoperative cerebral complications. Remote ischaemic preconditioning (RIPC) is known to minimise IRI in previous studies. Thus, we evaluated the effect of RIPC on regional cerebral oxygenation after tourniquet release during TKR. Methods: Patients undergoing TKR were randomly allocated to not receive RIPC (control group) and to receive RIPC (RIPC group). Regional cerebral oxygenation and pulmonary oxygenation were assessed up to 24 h postoperatively...
2017: International Journal of Medical Sciences
https://www.readbyqxmd.com/read/28258686/ischaemic-preconditioning-for-the-reduction-of-renal-ischaemia-reperfusion-injury
#10
REVIEW
Theo P Menting, Kimberley E Wever, Denise Md Ozdemir-van Brunschot, Daan Ja Van der Vliet, Maroeska M Rovers, Michiel C Warle
BACKGROUND: Ischaemia reperfusion injury can lead to kidney dysfunction or failure. Ischaemic preconditioning is a short period of deprivation of blood supply to particular organs or tissue, followed by a period of reperfusion. It has the potential to protect kidneys from ischaemia reperfusion injury. OBJECTIVES: This review aimed to look at the benefits and harms of local and remote ischaemic preconditioning to reduce ischaemia and reperfusion injury among people with renal ischaemia reperfusion injury...
March 4, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28203734/remote-ischaemic-preconditioning-an-intervention-for-anaesthetists
#11
R Mouton, J Soar
No abstract text is available yet for this article.
March 1, 2017: British Journal of Anaesthesia
https://www.readbyqxmd.com/read/28192894/remote-ischemic-preconditioning-in-cardiac-anesthesia-a-review-focusing-on-translation
#12
Christian Stoppe, Patrick Meybohm, Carina Benstoem, Andreas Goetzenich
INTRODUCTION: Remote Ischaemic Conditioning (RIC) is a powerful cardioprotective strategy. Its clinical application is simple, cheap and so far free from secondary side effects. Given the heterogeneous results of recent large-scale clinical trials, its clinical relevant benefit is still doubted. EVIDENCE ACQUISITION: Following a MEDLINE-based search on all publications concerning RIC in experimental or clinical settings, this review focuses on the translation from bench to bedside...
February 13, 2017: Minerva Anestesiologica
https://www.readbyqxmd.com/read/28186163/label-free-detection-of-myocardial-ischaemia-in-the-perfused-rat-heart-by-spontaneous-raman-spectroscopy
#13
Suguru Ohira, Hideo Tanaka, Yoshinori Harada, Takeo Minamikawa, Yasuaki Kumamoto, Satoaki Matoba, Hitoshi Yaku, Tetsuro Takamatsu
Raman spectroscopy, which identifies intrinsic molecular constituents, has a potential for determining myocardial viability under label-free conditions. However, its suitability for evaluating myocardial ischaemia is undetermined. Focusing on cytochromes, i.e., representative molecules reflecting mitochondrial activity, we tested whether Raman spectroscopy is applicable for evaluating myocardial ischaemia especially during early ischaemic phase. We obtained spontaneous Raman spectra of the subepicardial myocardium in the Langendorff-perfused rat heart upon 532-nm excitation before and during the "stopped-flow," global ischaemia...
February 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28138736/the-intensive-care-medicine-agenda-on-acute-kidney-injury
#14
REVIEW
Peter Pickkers, Marlies Ostermann, Michael Joannidis, Alexander Zarbock, Eric Hoste, Rinaldo Bellomo, John Prowle, Michael Darmon, Joseph V Bonventre, Lui Forni, Sean M Bagshaw, Miet Schetz
Acute kidney injury (AKI) is a common complication in the critically ill. Current standard of care mainly relies on identification of patients at risk, haemodynamic optimization, avoidance of nephrotoxicity and the use of renal replacement therapy (RRT) in established AKI. The detection of early biomarkers of renal tissue damage is a recent development that allows amending the late and insensitive diagnosis with current AKI criteria. Increasing evidence suggests that the consequences of an episode of AKI extend long beyond the acute hospitalization...
January 30, 2017: Intensive Care Medicine
https://www.readbyqxmd.com/read/28135708/remote-ischaemic-preconditioning-and-sevoflurane-postconditioning-synergistically-protect-rats-from-myocardial-injury-induced-by-ischemia-and-reperfusion-partly-via-inhibition-tlr4-myd88-nf-%C3%AE%C2%BAb-signaling-pathway
#15
Jiru Zhang, Jing Zhang, Peng Yu, Min Chen, Qingfeng Peng, Zhiqiang Wang, Nan Dong
BACKGROUND/AIMS: A combination sevoflurane postconditioning (SPC) and remote ischemic preconditioning (RIPC) is proved effective in an ex vivo rat heart perfusion model. However, the combined effect of those two interventions is not tested in rat myocardial ischemia/reperfusion (I/R) model, and the underlying mechanisms remain to be elucidated. This study aimed to investigate the effect in vivo using a rat myocardial I/R model and illuminate the related mechanisms. METHODS: Forty male Sprague-Dawley rats were randomly divided into the following 5 groups: i) sham-operated control; ii) I/R; iii) I/R + RIPC; iv) I/R + SPC; v) I/R + RIPC + SPC...
January 16, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28134657/burning-pain-axonal-dysfunction-in-erythromelalgia
#16
Michelle A Farrar, Ming-Jen Lee, James Howells, Peter I Andrews, Cindy S-Y Lin
Erythromelalgia (EM) is a rare neurovascular disorder characterized by intermittent severe burning pain, erythema, and warmth in the extremities on heat stimuli. To investigate the underlying pathophysiology, peripheral axonal excitability studies were performed and changes with heating and therapy explored. Multiple excitability indices (stimulus-response curve, strength-duration time constant (SDTC), threshold electrotonus, and recovery cycle) were investigated in 23 (9 EMSCN9A+ and 14 EMSCN9A-) genetically characterized patients with EM stimulating median motor and sensory axons at the wrist...
May 2017: Pain
https://www.readbyqxmd.com/read/28118517/the-significance-of-the-washout-period-in-preconditioning
#17
Ruduwaan Salie, Amanda Lochner, Dirk J Loubser
Exposure of the heart to 5 min global ischaemia (I) followed by 5 min reperfusion (R) (ischaemic preconditioning, IPC) or transient Beta 2-adrenergic receptor (B2-AR) stimulation with formoterol (B2PC), followed by 5 min washout before index ischaemia, elicits cardioprotection against subsequent sustained ischaemia. Since the washout period during preconditioning is essential for subsequent cardioprotection, the aim of this study was to investigate the involvement of protein kinase A (PKA), reactive oxygen species (ROS), extracellular signal-regulated kinase (ERK), PKB/Akt, p38 MAPK and c-jun N-terminal kinase (JNK) during this period...
January 24, 2017: Cardiovascular Therapeutics
https://www.readbyqxmd.com/read/28094122/cardiac-remote-ischaemic-preconditioning-mechanistic-and-clinical-considerations
#18
REVIEW
Jerrett K Lau, Gabrielle J Pennings, Andy Yong, Leonard Kritharides
Brief, non-harmful ischaemic insults to an organ remote from the heart, remote ischaemic preconditioning (RIPC), has been proposed to confer protection to the heart against ischaemia-reperfusion injury. While most clinical trials of RIPC during coronary interventions (PCI) suggest benefit, recent large, multicentre trials in coronary artery bypass surgery suggest a lack of efficacy. Mechanistically, RIPC most likely promotes the release of circulating factors which modulate multiple cellular pathways in the heart, promoting cell survival...
December 12, 2016: Heart, Lung & Circulation
https://www.readbyqxmd.com/read/28091727/intrinsic-cardiac-ganglia-and-acetylcholine-are-important-in-the-mechanism-of-ischaemic-preconditioning
#19
J M J Pickard, N Burke, S M Davidson, D M Yellon
This study aimed to investigate the role of the intrinsic cardiac nervous system in the mechanism of classical myocardial ischaemic preconditioning (IPC). Isolated perfused rat hearts were subjected to 35-min regional ischaemia and 60-min reperfusion. IPC was induced as three cycles of 5-min global ischaemia-reperfusion, and provided significant reduction in infarct size (IS/AAR = 14 ± 2% vs control IS/AAR = 48 ± 3%, p < 0.05). Treatment with the ganglionic antagonist, hexamethonium (50 μM), blocked IPC protection (IS/AAR = 37 ± 7%, p < 0...
March 2017: Basic Research in Cardiology
https://www.readbyqxmd.com/read/28074482/remote-ischaemic-preconditioning-suppresses-endogenous-plasma-nitrite-during-ischaemia-reperfusion-a-randomized-controlled-crossover-pilot-study
#20
Ashok Nair, Sitara Khan, Sami Omar, Xiao-Qing Pei, Karen McNeill, Phil Chowienczyk, Andrew James Webb
AIM: The aim of this article is to test the hypothesis that remote ischaemic preconditioning (RIPC) increases circulating endogenous local and systemic plasma (nitrite) during RIPC and ischaemia-reperfusion (IR) as a potential protective mechanism against ischaemia-reperfusion injury (IRI). METHODS: Six healthy male volunteers (mean age 29.5 ± 7.6 years) were randomized in a crossover study to initially receive either RIPC (4 × 5 min cycles) to the left arm, or no RIPC (control), both followed by an ischaemia-reperfusion (IR) sequence (20 min cuff inflation to 200 mmHg, 20 min reperfusion) to the right arm...
January 10, 2017: British Journal of Clinical Pharmacology
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