Clopidogrel, independent of the vascular P2Y(12) receptor, improves arterial function in small mesenteric arteries from Angll-hypertensive rats

The P2Y(12) receptor antagonist clopidogrel blocks platelet aggregation, improves systemic endothelial nitric oxide bioavailability and has anti-inflammatory effects. Since P2Y(12) receptors have been identified in the vasculature, we hypothesized that clopidogrel ameliorates Angll (angiotensin II)-induced vascular functional changes by blockade of P2Y(12) receptors in the vasculature. Male Sprague Dawley rats were infused with Angll (60 ng/min) or vehicle for 14 days. The animals were treated with clopidogrel (10 mg . kg(-1) of body weight . day(-1)) or vehicle. Vascular reactivity was evaluated in second-order mesenteric arteries. Clopidogrel treatment did not change systolic blood pressure [(mmHg) control-vehicle, 117 +/- 7.1 versus control-clopidogrel, 125 +/- 4.2; Angll vehicle, 197 +/- 10.7 versus Angll clopidogrel, 198 +/- 5.2], but it normalized increased phenylephrine-induced vascular contractions [(%KCI) vehicle-treated, 182.2 +/- 18% versus clopidogrel, 133 +/- 14%), as well as impaired vasodilation to acetylcholine [(%) vehicle-treated, 71.7 +/- 2.2 versus clopidogrel, 85.3 +/- 2.8) in Angll-treated animals. Vascular expression of P2Y(12) receptor was determined by Western blot. Pharmacological characterization of vascular P2Y(12) was performed with the P2Y(12) agonist 2-MeS-ADP [2-(methylthio) adenosine 5`-trihydrogen diphosphate trisodium]. Although 2-MeS-ADP induced endothelium-dependent relaxation [(Emax %) = 71 +/- 12%) as well as contractile vascular responses (Emax % = 83 +/- 12%), these actions are not mediated by P2Y(12) receptor activation. 2-MeS-ADP produced similar vascular responses in control and Angll rats. These results indicate potential effects of clopidogrel, such as improvement of hypertension-related vascular functional changes that are not associated with direct actions of clopidogrel in the vasculature, supporting the concept that activated platelets contribute to endothelial dysfunction, possibly via impaired nitric oxide bioavailability.

Histopathology and laser autofluorescence of ischemic kidneys of rats

The purpose of this research was to evaluate the severity of renal ischemia/reperfusion injury as determined by histology and by laser-induced fluorescence (LIF) with excitation wavelengths of 442 nm and 532 nm. Wistar rats (four groups of six animals) were subjected to left renal warm ischemia for 20, 40, 60 and 80 min followed by 10 min of reperfusion. Autofluorescence was determined before ischemia (control) and then every 5-10 min thereafter. Tissue samples for histology were harvested from the right kidney (control) and from the left kidney after reperfusion. LIF and ischemia time showed a significant correlation (p < 0.0001 and r (2)=0.47, and p=0.006 and r (2)=0.25, respectively, for the excitation wavelengths of 442 nm and 532 nm). Histological scores showed a good correlation with ischemia time (p < 0.0001). The correlations between optical spectroscopy values and histological damage were: LIF at 442 nm p < 0.0001, LIF at 532 nm p=0.001; IFF (peak of back scattered light/LIF) at 442 nm p > 0.05, and IFF at 532 nm p > 0.05. After reperfusion LIF tended to return to preischemic basal levels which occurred in the presence of histological damage. This suggests that factors other than morphological alterations may have a more relevant effect on changes observed in LIF. In conclusion, renal ischemia/reperfusion changed tissue fluorescence induced by laser. The excitation light of 442 nm showed a better correlation with the ischemia time and with the severity of tissue injury.

Renal ischemia in rats: Mitochondria function and laser autofluorescence

Ischemia-reperfusion injury is the major cause of organ dysfunction or even nonfunction following transplantation. It can attenuate the long-term survival of transplanted organs. To evaluate the severity of renal ischemia injury determined by histology, we applied laser(442 nm and 532 nm) induced fluorescence (LIF), mitochondria respiration, and membrane swelling to evaluate 28 Wistar rats that underwent left kidney warm ischemia for 20, 40, 60, or 80 minutes. LIF performed before ischemia (control) was repeated at 20, 40, 60, and 80 minutes thereafter. We harvested left kidney tissue samples immediately after LIF determination for histology and mitochondrial analyses: state 3 and 4 respiration, respiration control rate (RCR), and membrane swelling. The association of optic spectroscopy with histological damage showed: LIF, 442 nm (r(2) = 0.39, P < .001) and 532 nm, (r(2) = 0.18, P = .003); reflecting laser/fluorescence-induced, 442 nm (r(2) = 0.20, P = .002) and 532 nm (r(2) = 0.004, P = .67). The associations between mitochondria function and tissue damage were: state 3 respiration (r(2) = 0.43, P = .0004), state 4 respiration (r(2) = 0.03, P = 0.38), RCR (r(2) = 0.28, P = .007), and membrane swelling (r(2) = 0.02, P = .43). The intensity of fluorescence emitted by tissue excited by laser, especially at a wave length of 442 nm, was determined in real time. Mitochondrial state 3 respiration and respiratory control ratio also exhibited good correlations with the grade of ischemic tissue damage.

Arterial spin labeling of cerebral perfusion territories using a seperate labeling coil

Purpose: To obtain cerebral perfusion territories of the left, the right. and the posterior circulation in humans with high signal-to-noise ratio (SNR) and robust delineation. Materials and Methods: Continuous arterial spin labeling (CASL) was implemented using a dedicated radio frequency (RF) coil. positioned over the neck, to label the major cerebral feeding arteries in humans. Selective labeling was achieved by flow-driven adiabatic fast passage and by tilting the longitudinal labeling gradient about the Y-axis by theta = +/- 60 degrees. Results: Mean cerebral blood flow (CBF) values in gray matter (GM) and white matter (WM) were 74 +/- 13 mL center dot 100 g(-1) center dot minute(-1) and 14 +/- 13 mL center dot 100 g(-1) center dot minute(-1), respectively (N = 14). There were no signal differences between left and right hemispheres when theta = 0 degrees (P > 0.19), indicating efficient labeling of both hemispheres. When theta = +60 degrees, the signal in GM on the left hemisphere, 0.07 +/- 0.06%, was 92% lower than on the right hemisphere. 0.85 +/- 0.30% (P < 1 x 10(-9)). while for theta = -60 degrees, the signal in the right hemisphere. 0.16 +/- 0.13%, was 82% lower than on the contralateral side. 0.89 +/- 0.22% (P < 1 x 10(-10)). Similar attenuations were obtained in WM. Conclusion: Clear delineation of the left and right cerebral perfusion territories was obtained, allowing discrimination of the anterior and posterior circulation in each hemisphere.

"Det är mycket man inte vill minnas" : Upplevelse av kognitiv rehabilitering och livskvalitet samt innebörd av livskvalitet vid stroke

Syftet med denna kvalitativa studie var att beskriva upplevelse och innebörd av begreppen kognitiv rehabilitering och livskvalitet för personer som hade haft stroke. Studien genomfördes med hjälp av personliga intervjuer. Fem personer ingick i studien, tre män och två kvinnor, alla födda på 30-talet utom en man som föddes på 20-talet. Samtliga var gifta. Personerna rekryterades till studien via en sjuksköterska som hade kännedom om lämpliga personer som blivit utskrivna en kort tid före studiens början. Informanterna intervjuades med hjälp av en intervjuguide med utgångspunkt från två frågeområden som berörde upplevelse av kognitiv rehabilitering och upplevelse och innebörd av livskvalitet efter stroke. Analysen gjordes med hjälp av innehållsanalys. Analysen av de fem intervjuerna gav sex teman; Upplevelse av att inte någon kognitiv rehabilitering har utförts, Upplevelse av att informanten själv förväntades träna upp sina kognitiva funktioner, Strävan efter att leva som vanligt, Förändrad livskvalité, Förändrad livssyn, Betydelsen av det sociala stödet. Det framkom att ingen av informanterna upplevde att det hade genomförts någon kognitiv rehabilitering. Alla upplevde sig däremot ha fått en fullständig fysisk rehabilitering på avdelningen. Informanterna hade som mål med sin rehabilitering att klara av de vardagliga funktionerna i hemmet såsom innan stroken. En av deltagarna upplevde att det förväntades att självständigt träna upp sina kognitiva funktioner. Livskvaliteten idag var att kunna fortsätta leva som förut, vilket förhindrades av vissa inskränkningar motoriskt och kognitivt. Alla värdesatte livet högre idag och accepterade sin situation som den var. Vänskapen med andra var också en viktig del i livskvaliteten.

Dysfagi efter stroke : Omvårdnadsåtgärder för att underlätta näringsintag och måltidssituationer

Dysfagi betyder svårt att svälja och innefattar många olika problem. Det kan vara svårigheter med att få födan att passera från munnen bakåt till svalget, att riskera att få ner mat och dryck i lungorna vilket ger lungkomplikationer. En känsla av att maten fastnar i bröstet men också ett hot om isolering. Syftet med denna litteraturstudie var att undersöka patientens egna upplevelser av måltidssituationer, hur malnutrition kan förebyggas samt vilka omvårdnadsåtgärder som underlättar ätandet för patienter som i samband med en stroke drabbats av dysfagi. Artiklar har sökts i databaserna Blackwell Synergy, Swemed+, Elin@Dalarna och Medline. Manuellt har litteratur sökts på Ludvika Kommuns bibliotek och bland tidigare studielitteratur. Urvalet begränsades till att beröra patienter som fått dysfagi i samband med en stroke vidare skulle artiklarna ha en relevans till syfte och frågeställning. Till resultat delen har 12 artiklar använts. Munvård och konsistensanpassning av mat och dryck är omvårdnadsåtgärder som visat sig ge bra resultat vidare är det viktigt med lugn vid matbordet och att måltiden får ta den tid den tar. Att dricka en kopp kaffe kan ta en timme för en person med dysfagi. Nyttan av information och tips om olika knep, tekniska hjälpmedel och träning är inte att förringa.

Ätsvårigheter efter stroke : Upplevelser och stöd

Syftet med litteraturstudien var att belysa strokepatienters upplevelser av måltissituationen samt beskriva de vanligaste ätsvårigheterna som strokepatienter kan ha samt att undersöka hur vårdpersonal kan hjälpa vid ätsvårigheter. Studien genomfördes som en litteraturstudie som baserades på 12 vetenskapliga artiklar. Artiklarna söktes via hörskolan dalarnas sökmotorer/databaser och sökorden som kombinerades var dysphagia, eating situation, nursing, nutrition och stroke. Artiklarna granskades enlig modifierade granskningsmallar. Resultatet visar på att strokedrabbade kunde uppleva sina svårigheter vid måltiden som pinsamma. Patienterna hade en strävan att återgå till det normala. Vanliga ätsvårigheter var att stokepatienterna hade tugg och sväljproblem och att patienterna hade en dålig sittposition under måltiden. Några hade svårt att transportera maten till munnen och hade nedsatt vakenhet under måltiden och smak och luktförändringar var vanliga. Det stöd som vårdpersonal kunde ge strokepatienterna med sväljsvårigheter var att anpassa konsistensen på mat och dryck. Genom att göra läpp och tungövningar och sväljträning kunde sväljförmågan förbättras för patienter med dysfagi. Resultatet visade även att de som vårdats på rehabiliteringsavdelning hade förbättrad sittposition samt lättare att transportera maten till munnen och mindre påverkade sväljsvårigheter.

Kommunikation med patienter som har afasi till följd av stroke : En litteraturöversikt

Syfte: Syftet med denna litteraturöversikt var att beskriva hälso- och sjukvårdspersonalens upplevelser av kommunikation med patienter som drabbats av afasi till följd av stroke. Vidare var syftet att beskriva vad det kunde finnas för hinder för en god kommunikation dem emellan. Ett ytterligare syfte var att beskriva de faktorer som kunde underlätta kommunikation mellan hälso- och sjukvårdspersonal och patienter som har afasi till följd av stroke. Metod: Artikelsökning till denna litteraturöversikt gjordes i PubMed, CINAHL, Cochrane och Vård i Norden. Artiklarna var publicerade mellan åren 2000-2010 samt skrivna på svenska eller engelska. Huvudresultat: En fungerande vårdrelation var en grundförutsättning för att bedriva en god omvårdnad. För skapandet av denna vårdrelation behövdes en lugn, stödjande och avslappnande miljö. Asymmetri förekom i olika varianter i kommunikation mellan hälso- och sjukvårdspersonal och patienter med afasi. Hälso- och sjukvårdspersonal upplevde både negativa och positiva känslor i interaktionen med patienten. Slutsats: Att plötsligt förlora sin kommunikationsförmåga genom det verbala språket har påvisats vara en tragedi för den drabbade. Det ställde krav på hälso- och sjukvårdspersonalen vars uppgift var att bevara patientens autonomi och integritet. För att både hälso- och sjukvårdspersonal samt patienter skulle må bra och kunna kommunicera så framkom det att strokeenheter kunde vara betydelsefulla.

Biomarkers of extracellular matrix metabolism (MMP-9 and TIMP-1) and risk of stroke, myocardial infarction and cause-specific mortality : cohort study

Objective: Turnover of the extracellular matrix in all solid organs is governed mainly by a balance between the degrading matrix metalloproteinases (MMPs) and their tissue inhibitors (TIMPs). An altered extracellular matrix metabolism has been implicated in a variety of diseases. We investigated relations of serum levels of MMP-9 and TIMP-1 to mortality risk from an etiological perspective. Design: The prospective Uppsala Longitudinal Study of Adult Men (ULSAM) cohort, followed from 1991–1995 for up to 18.1 years. A random population-based sample of 1,082 71-year-old men, no loss to follow-up. Endpoints were all-cause (n = 628), cardiovascular (n = 230), non-cardiovascular (n = 398) and cancer mortality (n = 178), and fatal or non-fatal myocardial infarction (n = 138) or stroke (n = 163). Results: Serum MMP-9 and TIMP-1 levels were associated with risk of all-cause mortality (Cox proportional hazard ratio [HR] per standard deviation 1.10, 95% confidence interval [CI] 1.03–1.19; and 1.11, 1.02–1.20; respectively). TIMP-1 levels were mainly related to risks of cardiovascular mortality and stroke (HR per standard deviation 1.22, 95% CI 1.09–1.37; and 1.18, 1.04–1.35; respectively). All relations except those of TIMP-1 to stroke risk were attenuated by adjustment for cardiovascular disease risk factors. Relations in a subsample without cardiovascular disease or cancer were similar to those in the total sample. Conclusion: In this community-based cohort of elderly men, serum MMP-9 and TIMP-1 levels were related to mortality risk. An altered extracellular matrix metabolism may be involved in several detrimental pathways, and circulating MMP-9 or TIMP-1 levels may be relevant markers thereof.

Faktorer av betydelse för livskvalitet efter stroke ur ett patientperspektiv : en systematisk litteraturstudie

Stroke är en allvarlig sjukdom som betraktas som den främsta orsaken till funktionsnedsätt-ning i vuxen ålder och kräver flest vårddagar på sjukhus. Syftet med denna studie var att analysera vilka faktorer som har betydelse för en persons livskvalitet efter genomgången stroke samt möjligheter för hälso- och sjukvårdspersonal att underlätta för strokepatienten att återfå sin livskvalitet. Studien genomfördes som en sammanställning av litteraturen med induktiv ansats där författarna granskade fyra studier med kvalitativ design och nio studier med kvantitativ design. Utmaningarna efter stroke är många för den som insjuknat. Livskvalitet påverkas inte enbart av de fysiska funktionsnedsättningar som stroke medför utan även av psykiska och sociala faktorer som till exempel depression, ångest, brist på socialt umgänge och fritidsaktiviteter. Kunskap, motivation och stöd var avgörande faktorer under återhämtningen och påverkade patientens följsamhet till rehabiliteringen. Studiens resultat visade att KUNSKAP om sjuk-domen, rehabiliteringen och de resurser som fanns att tillgå under den krävande återhämtningsprocessen var en viktig faktor för att strokepatienter skulle uppleva meningsfullhet med tillvaron och på så sätt uppleva livskvalitet. Kunskap ökade i sin tur MOTIVATIONEN vilket bidrog till att patienter valde att fortsätta vilja och orka återfå förlorade funktioner. För att detta skulle vara möjligt måste personer som drabbats av stroke erhålla STÖD i form av hjälp från familj och vänner samt olika insatser från hälso- och sjukvården.

What aspects of rehabilitation provision contribute to self-reported met needs for rehabilitation one year after stroke - amount, place, operator or timing?

BACKGROUND AND OBJECTIVE: To a large extent, people who have suffered a stroke report unmet needs for rehabilitation. The purpose of this study was to explore aspects of rehabilitation provision that potentially contribute to self-reported met needs for rehabilitation 12 months after stroke with consideration also to severity of stroke. METHODS: The participants (n = 173) received care at the stroke units at the Karolinska University Hospital, Sweden. Using a questionnaire, the dependent variable, self-reported met needs for rehabilitation, was collected at 12 months after stroke. The independent variables were four aspects of rehabilitation provision based on data retrieved from registers and structured according to four aspects: amount of rehabilitation, service level (day care rehabilitation, primary care rehabilitation and home-based rehabilitation), operator level (physiotherapist, occupational therapist, speech therapist) and time after stroke onset. Multivariate logistic regression analyses regarding the aspects of rehabilitation were performed for the participants who were divided into three groups based on stroke severity at onset. RESULTS: Participants with moderate/severe stroke who had seen a physiotherapist at least once during each of the 1st, 2nd and 3rd-4th quarters of the first year (OR 8.36, CI 1.40-49.88 P = 0.020) were more likely to report met rehabilitation needs. CONCLUSION: For people with moderate/severe stroke, continuity in rehabilitation (preferably physiotherapy) during the first year after stroke seems to be associated with self-reported met needs for rehabilitation.

Assessing feasibility and acceptability of study procedures : getting ready for implementation of national stroke guidelines in out-patient health care

BACKGROUND: Even though Swedish national guidelines for stroke care (SNGSC) have been accessible for nearly a decade access to stroke rehabilitation in out-patient health care vary considerably. In order to aid future interventions studies for implementation of SNGSC, this study assessed the feasibility and acceptability of study procedures including analysis of the context in out-patient health care settings. METHODS: The feasibility and acceptability of recruitment, observations and interviews with managers, staff and patients were assessed, as well as the feasibility of surveying health care records. RESULTS: To identify patients from the the hospitals was feasible but not from out-patient care where a need to relieve clinical staff of the recruitment process was identified. Assessing adherence to guidelines and standardized evaluations of patient outcomes through health care records was found to be feasible and suitable assessment tools to evaluate patient outcome were identified. Interviews were found to be a feasible and acceptable tool to survey the context of the health care setting. CONCLUSION: In this feasibility study a variety of qualitative and quantitative data collection procedures and measures were tested. The results indicate what can be used as a set of feasible and acceptable data collection procedures and suitable measures for studying implementation of stroke guidelines in an out-patient health care context.

Facilitators and barriers to applying a national quality registry for quality improvement in stroke care

BACKGROUND: National quality registries (NQRs) purportedly facilitate quality improvement, while neither the extent nor the mechanisms of such a relationship are fully known. The aim of this case study is to describe the experiences of local stakeholders to determine those elements that facilitate and hinder clinical quality improvement in relation to participation in a well-known and established NQR on stroke in Sweden. METHODS: A strategic sample was drawn of 8 hospitals in 4 county councils, representing a variety of settings and outcomes according to the NQR's criteria. Semi-structured telephone interviews were conducted with 25 managers, physicians in charge of the Riks-Stroke, and registered nurses registering local data at the hospitals. Interviews, including aspects of barriers and facilitators within the NQR and the local context, were analysed with content analysis. RESULTS: An NQR can provide vital aspects for facilitating evidence-based practice, for example, local data drawn from national guidelines which can be used for comparisons over time within the organisation or with other hospitals. Major effort is required to ensure that data entries are accurate and valid, and thus the trustworthiness of local data output competes with resources needed for everyday clinical stroke care and quality improvement initiatives. Local stakeholders with knowledge of and interest in both the medical area (in this case stroke) and quality improvement can apply the NQR data to effectively initiate, carry out, and evaluate quality improvement, if supported by managers and co-workers, a common stroke care process and an operational management system that embraces and engages with the NQR data. CONCLUSION: While quality registries are assumed to support adherence to evidence-based guidelines around the world, this study proposes that a NQR can facilitate improvement of care but neither the registry itself nor the reporting of data initiates quality improvement. Rather, the local and general evidence provided by the NQR must be considered relevant and must be applied in the local context. Further, the quality improvement process needs to be facilitated by stakeholders collaborating within and outside the context, who know how to initiate, perform, and evaluate quality improvement, and who have the resources to do so.

Health problems in elderly patients during the first post-stroke year

BACKGROUND: A wide range of health problems has been reported in elderly post-stroke patients. AIM: The aim of this study was to analyse the prevalence and timing of health problems identified by patient interviews and scrutiny of primary health care and municipality elderly health care records during the first post-stroke year. METHODS: A total of 390 consecutive patients, ≥65 years, discharged alive from hospital after a stroke event, were followed for 1 year post-admission. Information on the health care situation during the first post-stroke year was obtained from primary health care and municipal elderly health care records and through interviews with the stroke survivors, at 1 week after discharge, and 3 and 12 months after hospital admission. RESULTS: More than 90% had some health problem at some time during the year, while based on patient record data only 4-8% had problems during a given week. The prevalence of interview-based health problems was generally higher than record-based prevalence, and the ranking order was moderately different. The most frequently interview-reported problems were associated with perception, activity, and tiredness, while the most common record-based findings indicated pain, bladder and bowel function, and breathing and circulation problems. There was co-occurrence between some problems, such as those relating to cognition, activity, and tiredness. CONCLUSIONS: Almost all patients had a health problem during the year, but few occurred in a given week. Cognitive and communication problems were more common in interview data than record data. Co-occurrence may be used to identify subtle health problems.