A left ventricular thrombus develops in approximately 40% of patients following an anterior myocardial infarction. Embolization from these thrombi has been regarded as the most important cause of stroke following a myocardial infarction. The occurrence and characteristics of left ventricular thrombi and stroke after anterior myocardial infarction may, however, have changed after the introduction of aspirin and thrombolytics as standard therapy. The occurrence of left ventricular thrombi was examined in 99 patients with an acute anterior myocardial infarction, 74 of whom were treated with streptokinase. Thrombi were equally common in the thrombolysis group (46%, 95% confidence interval [Cl], 35-57%) as in the non-thrombolysis group (40%, 95% Cl, 21-59%). The risk of thrombus formation was related to the degree of left ventricular segmental dysfunction. Using serial echocardiographic examinations, the formation and resolution of thrombi was found to be highly dynamic. The majority of thrombi diagnosed during the hospital stay had resolved at follow-up one month later, irrespective of treatment with streptokinase or anticoagulants. The development of new thrombi was, however, observed at every follow-up examination interval. One-hundred-and-twenty-four patients suffering a stroke within 28 days of an acute myocardial infarction were identified in the northern Sweden MONICA stroke registry between 1985 and 1994. The overall event rate of ischemic myocardial infarction-related stroke was 1.07%. The risk of a stroke was highest duringt he first 5 days after the infarction. Only approximately half the strokes were preceded by an anterior myocardial infarction. In a case-control analysis, atrial fibrillation (chronic or new onset), ST elevation and a history of a previous stroke were found to be independent predictors of stroke. There was a long-term trend towards a lower incidence and event rate for myocardial infarction-related stroke. Clinical stroke characteristics were examined in 103 patients with a first-ever stroke within 28 days of a myocardial infarction and compared with stroke characteristics in 206 control subjects without a recent myocardial infarction. The sudden onset of neurological symptoms, an impairment of consciousness, a progression in neurological deficits and a stroke of the total anterior circulation infarction subclass were more common in cases than in controls. The risk of a recurrent stroke during one year of follow-up was not influenced by a recent myocardial infarction, but patients who had suffered a myocardial infarction had markedly higher mortality. To conclude, thrombolytic treatment does not reduce the occurrence of left ventricular thrombi after a myocardial infarction. The risk of thrombus formation is related to the extent of the myocardial injury. The development and resolution of thrombi is a highly dynamic process. There is a long-term trend towards a lower incidence and event rate of ischemic stroke after a myocardial infarction. Although the clinical stroke characteristics differ, they are not specific enough to differentiate between patients with and without a recent myocardial infarction. / <p>S. 1-84: sammanfattning, s. 85-136: 5 uppsatser</p> / digitalisering@umu

Diss. (sammanfattning) Stockholm : Karol inst., 2003. / Härtill 5 uppsatser.

In 1996, the United States Food and Drug Administration officially approved the use of intravenous recombinant tissue-type plasminogen activator for treatment of acute ischemic stroke, with the requirement that a baseline computed tomography (CT) scan be performed to rule out acute intracerebral or subarachnoid hemorrhage. Today, the American Heart Association (AHA) Stroke Council acknowledges magnetic resonance imaging (MRI) as more sensitive to the detection of ischemia, and yet, guidelines released by the group suggest that either CT or MRI may serve as the primary, hyperacute imaging modality. The AHA recommends that for most cases, non-contrast-enhanced CT scans provide sufficient information for medical management decisions. A systematic review of published literature was conducted to compare current capabilities of CT and MRI in an effort to determine which imaging modality should be used in the setting of acute ischemic stroke. Current research indicates that MRI is comparable to CT in the detection of acute hemorrhage, but superior in the detection of acute ischemia. In addition, MRI has demonstrated the ability to not only identify suitable patients for treatment, but also identify patients whose treatment would be unnecessary and potentially dangerous. Therefore, the hope is that clinical guidelines, like those released by the AHA Stroke Council, will be modified to promote MRI as the primary imaging modality. A modification to the major clinical guidelines will initiate a change in the approach of acute stroke evaluation across all clinical stroke centers.

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Agradecemos a compreensão. on 2017-04-07T14:53:15Z (GMT) / Submitted by PRISCILA WATSON RIBEIRO null (priwtr@yahoo.com.br) on 2017-04-07T17:01:13Z No. of bitstreams: 1 Doutorado Priscila Final.pdf: 863235 bytes, checksum: b23835e505c931b9c7f5fdcf434d43ad (MD5) / Approved for entry into archive by Luiz Galeffi (luizgaleffi@gmail.com) on 2017-04-11T19:08:43Z (GMT) No. of bitstreams: 1 ribeiro_pw_dr_bot.pdf: 863235 bytes, checksum: b23835e505c931b9c7f5fdcf434d43ad (MD5) / Made available in DSpace on 2017-04-11T19:08:43Z (GMT). No. of bitstreams: 1 ribeiro_pw_dr_bot.pdf: 863235 bytes, checksum: b23835e505c931b9c7f5fdcf434d43ad (MD5) Previous issue date: 2017-03-03 / Introdução: A terapia de reperfusão cerebral é uma das modalidades de tratamento do Acidente Vascular Cerebral (AVC) agudo capaz de promover a recuperação dos déficits neurológicos e a redução da incapacidade funcional. A restauração do fluxo sanguíneo pela ação do trombolítico em áreas corticais específicas pode minimizar o grau de comprometimento da disfagia orofaríngea bem como suas complicações. Objetivo: analisar e comparar o desempenho de parâmetros qualitativos e quantitativos específicos da deglutição em indivíduos pós-AVC trombolisados e não trombolisados. Casuística e Método: Estudo coorte prospectivo. Participaram no estudo 32 indivíduos pós-AVC isquêmico, sendo 19 trombolisados (grupo 1) e 13 não trombolisados (grupo 2). Realizado o exame de videofluoroscopia da deglutição e análise da penetração laríngea e aspiração laringotraqueal, Início da Resposta Faríngea (IRF), Tempo de Trânsito Faríngeo (TTF), além do nível de ingestão oral e ocorrência de pneumonia nos primeiros cinco dias após o tratamento de reperfusão cerebral e em 30 dias após o AVC. Resultados: Na comparação entre os grupos em relação à penetração laríngea e aspiração, o grupo de pacientes não trombolisados apresentou maiores índices de penetração laríngea com líquido na avaliação de 30 dias (p=0,007). Quanto às medidas temporais de IRF e TTF, ambos os grupos apresentaram pacientes com alterações nos dois momentos de avaliação, sem diferença estatística entre eles (p=0.646 e p=1,000). A evolução no nível de ingestão oral foi maior no grupo de pacientes trombolisados, sendo que todos atingiram o nível 7 da FOIS (Escala Funcional de Ingestão Oral) na avaliação de 30 dias sem significância estatística (p=0,020). Não houve diferença significativa entre os grupos quanto à presença de pneumonia, 16% no G1 e 15% no G2 na avaliação dos primeiros cinco dias. Conclusão: Os dois grupos apresentaram evoluções nos parâmetros de deglutição em relação aos dois momentos de avaliação. No entanto, não houve diferença ao comparar os indivíduos trombolisados e não trombolisados em relação aos parâmetros quantitativos e qualitativos da deglutição. / Background: The cerebral reperfusion therapy is one of the treatments for stroke that promoting recovery of neurological deficits and reduction of functional incapacity. Restoration of blood flow by thrombolytic action in specific cortical areas may minimize the degree of impairment of oropharyngeal dysphagia as well as its complications. The aim of this study was to analyze and compare the performance of specific qualitative and quantitative parameters of swallowing in stroke patients who are both thrombolytic and non-thrombolytic. Method: Prospective cohort study. The study included 32 individuals after ischemic stroke, of which 19 thrombolytic (group 1) and 13 non-thrombolytic (group 2). The videofluoroscopy examination and analysis of laryngeal penetration and aspiration, pharyngeal swallow response (PSR), Pharyngeal Transit Time (PTT), oral intake level and occurrence of pneumonia in the first five days after treatment reperfusion and within 30 days after stroke. Results: In the comparison between the groups in relation to laryngeal penetration and aspiration, the group of non-thrombolytic patients presented higher rates of laryngeal penetration with fluid at the 30-day (p = 0.007). Regarding the temporal measures of PSR and PTT, both groups presented patients with alterations in the two moments of evaluation, without statistical significance between the groups (p = 0.646 and p = 1,000). The evolution in the level of oral intake was higher in the group of patients with thrombolysis, and all level 7 of the FOIS (Functional Oral Intake Scale) in the evaluation of 30 days without statistical significance (p = 0.020). There were no significant differences between the groups regarding of pneumonia, 16% in G1 and 15% in G2 in the evaluation of the first five days. Conclusion: The two groups showed changes in swallowing parameters in relation to the two moments of evaluation. However, there was no difference in comparing the thrombolytic and non-thrombolytic individuals in relation to the quantitative and qualitative parameters of swallowing.

A 53 year-old male presented with a one-day history of a swollen arm and dull, aching pain in the right upper extremity. The patient reported commencing exercising daily over the prior week with a modified, oscillating dumbbell; commonly referred to as a Shake Weight. Imaging revealed an occlusive thrombus in the right axillary, proximal brachial and basilic veins. The patient was treated with a 24-hour tPA infusion followed by mechanical thrombectomy, balloon angioplasty, and stent placement for a residual thrombus and stenosis. The patient was discharged the following day on warfarin and aspirin. This is the first report of effort-induced thrombosis of the upper extremity following the use of a modified, oscillating dumbbell. Due to the growing popularity of modified dumbbells and the possible risk for axillary vein thrombosis, consideration should be made to caution consumers of this potential complication.

Stroke thrombolysis is a method for restoring cerebral blood flow after ischemic stroke, with high priority in the Swedish national guidelines. implementation of stroke thrombolysis in Swedish routine stroke care has shown marked differences between demographic groups, hospital types, and regions. The general aim of this thesis were to examine the implementation of ischemic stroke thrombolysis in Swedish routine stroke care with an equity perspective; to gain more insight into the factors that influence implementation, how the treatment has reached patient groups, and differences in long-term outcomes between women and men. Analysis of data from research interviews with clinicians working within stroke care displayed that the facilitators of and barriers to the implementation of stroke thrombolysis could broadly be categorized into those related to individuals, to social interactions and context, and to organizational and resource issues. Key facilitating factors expressed in interviews were work pride and motivation, good leadership, involvement of all staff members in the implementation process, and quality assurance. Major barriers concerned lack of competence and experience, outdated attitudes regarding stroke management, counterproductive power structures, lack of continuity, and insufficient human resources. National quality register data displayed that stroke thrombolysis treatment expanded to reach more patients with mild deficits. Groups with higher education were more likely to receive treatment, compared to groups with lower educational level. These education group differences have, however, decreased over time in relative terms, but not in absolute terms. Further, there were considerable between-hospitals differences in treatment rates for patients with milder deficits, associated with hospital’s overall stroke thrombolysis rates. Moreover, larger non-university hospitals displayed treatment rate differences between educational groups that were not attributable to patient characteristics. Among thrombolysis-treated women and men, that was independent in ADL before their stroke and survived the first year post-stroke, women experienced higher probability to be dependent in ADL at both 3 and 12 months post-stroke, compared to men. This difference remained significant despite comprehensive adjustments for individual characteristics, symptom severity, and acute effects from stroke thrombolysis. This thesis displays that clinicians face barriers and facilitators at several levels, suggesting implementation interventions could be targeted towards both the individual-, the social interactions and context-, and also the organisation and available resources level. Assurance of clinicians’ individual competence, peer support, and clinical leadership seem to be important areas to intervene. Stroke thrombolysis rates have expanded over time, and an increase in stroke thrombolysis delivery to patients with mild stroke symptoms has contributed to this increase. However, it seems considerable differences between hospitals inhibit equity of care delivery. Further, socioeconomically disadvantaged groups receive less often stroke thrombolysis. Type of hospital seems to play a role, yet the reasons for this difference are not fully understood. This thesis also display that stroke thrombolysis-treated women that survive 1 year after stroke, appears to face higher risk for dependency in ADL, compared to men. / <p>Incorrect ISBN in print version 978-91-760-711-1. Correct ISBN should be 978-91-7601-711-1.</p>

A dissertation submitted to the Faculty of Health Sciences, University of the Witwatersrand, in fulfillment of the degree of Master of Science in Medicine, 2014 / The earliest possible initiation of reperfusion therapy is necessary to reduce morbidity and mortality from acute STEMI. Therefore improving the time to thrombolysis where percutaneous coronary interventional facilities are limited or do not exist is critical. The most effective system would integrate three key components to deliver continuous patient care, including: 1) from time of call for help through to emergency response; 2) transportation to and admission to hospital; 3) assessment and initiation of thrombolytic therapy. The purpose of this prospective study is: to develop a chest pain awareness education programme appropriate for the South African context; to assess safe initiation of thrombolytic therapy by emergency care practitioners for STEMI; and to compare the performance of emergency care practitioner thrombolysis with historical control data.

<p>UVOD: Akutni ishemijski moždani udar (AIMU) je poremećaj moždane funkcije nastao usled vaskularnih o&scaron;tećenja, uzrokovane okluzijom ili embolijom krvnog suda. Za razliku od standardnog CT pregleda endokranijuma, CT perfuzija (CTP) je napredna dijagnostička procedura koja može u prvim satima od početka simptoma AIMU pružiti precizne informacije o lokalizaciji i veličini infarkta mozga, a u okviru infarkta, razlikovati srž i ishemijsku penumbru. Samim tim, CTP predstavlja svojevrsnu pomoć u selekciji pacijenata za intravensku primenu rekombinantnog tkivnog plazminogen aktivatora (rtPA). CILJ RADA: Cilj istraživanja je bio da se primenom CTP ispita koliko iznosi: optimalna veličina srži, zatim minimalni i optimalan odnos penumbre i srži infarkta pogodnih za primenu rtPA, maligni profil srži infarkta koji je nepogodan za primenu rtPA i % simptomatske hemoragije kao komplikacije nakon rtPA. MATERIJAL I METODE: Istraživanje je obavljeno u Specijalnoj bolnici &bdquo;Sveti Sava&ldquo; u Beogradu kao petogodi&scaron;nja retrospektivna studija. Studija je obuhvatila ukupno 130 pacijenata sa AIMU kod kojih je primenjena CTP. Eksperimentalnu grupu je sačinjavalo 100 pacijenata kojima je aplikovana rtPA, a kontrolnu grupu 30 pacijenata, koji nisu primili rtPA. Svim ispitanicima su načinjeni: standardni CT pregled glave i CT perfuzija odmah nakon prijema i kontrolni standardni CT pregled endokranijuma 24 h nakon prijema u bolnicu. Pregledi su obavljeni sa 16-slajsnom MSCT aparatu, pri čemu je pokrivenost CTP iznosila 2 cm. &bdquo;Mismatch&ldquo; postoji ukoliko je perfuziona lezija na CBF mapi veća od perfuzionog deficita na CBV mapi (srţ infarkta). REZULTATI: Rezultati studije su pokazali da pacijenti oboleli od AIMU sa mismatchom manjim od 20% nisu imali koristi od primenjene rtPA, a pacijenti sa 20% i vi&scaron;e mismatch-om su imali ili umeren ili značajan neurolo&scaron;ki oporavak. Optimalni mismatch, kojim se postiže visoka uspe&scaron;nost nakon rtPA je iznosio ˃ 101% penumbre. Pacijenti sa povr&scaron;inom perfuzionog deficita na CBV mapi manjom od 1175 mm2 su imali bolji neurolo&scaron;ki oporavak, u odnosu na pacijente savećim lezijama, a samim tim su bili pogodni za primenu rtPA. Perfuzioni deficit na CBV mapi veći od 3000 mm2 (60ml) je predstavljao maligni profil infarkta, usled povećanog rizika od nastanka simptomatske hemoragije i smrtnog ishoda. Simptomatska hemoragija u eksperimentalnoj grupi je iznosila svega 3%, &scaron;to predstavlja nizak procenat komplikacija nakon reperfuzione terapije. ZAKLJUČAK: CT perfuzija je urgentna i brza tehnika, koja nam daje jedinstvene informacije o AIMU, pomaže u dono&scaron;enju odluke o terapijskom pristupu i može poslužiti kao surogat biomarker u predikciji kliničkog ishoda.</p> / <p>INTRODUCTION: Acute ischemic stroke (AIS) is functional brain disorder, which is happened due to vascular damaged, caused by vessel occlusion or embolism. Unlike to noncontrast brain CT, CT perfusion (CTP) is advanced diagnostic procedure, which could give accurate information about localization and extent of AIS in the first hours of symptom onset, and also differentiate infarct cor and ischemic penumbra. Thus, CTP helps in selection patients for administration intravenous recombinant tissue plasminogen activator (rtPA) AIM: The aims of study were to estimate: the size of optimal infarct cor, minimal and optimal ratio between penumbra and infarct core which is suitable for rtPA, malignant profile of infarct core which is not suitable for rtPA and percentage of symptomatic intracerebral hemorrhage as compli-cation after rtPA using CTP. MATERIAL AND METHODS: The investigation was performed in Stroke hospital &bdquo;Sveti Sava&rdquo; in Belgrade as five years retrospective study. Study included 130 patients with AIS with performed CT perfusion. One hundred patients from experimental group were treated with rtPA and thirty patients from control group were not treated with rtPA. All patients underwent baseline noncontrast CT of brain, CT perfusion and control 24 hours follow-up noncontrast brain CT. Examinations were done on 16-slice MSCT and CTP covered an area of 20 mm of brain tissue. &bdquo;Mismatch &ldquo;was defined as a perfusion lesion (CBF lesion) larger than the core lesion (CBV). RESULTS: Results of study showed that the patients with AIS and mismatch less than 20%, had no benefit from rtPA, but patients with &ge; 20% of mismatch had good or excellent clinical outcome. Optimal mismatch, which provided favorable response after rtPA, was ˃101% of penumbra. Patients with cor perfusion lesion (CBV) less than 1175 mm2, are suitable for rtPAand had better clinical outcome, then the patients with larger lesions. Perfusion cor lesions (CBV) larger than 3000 mm2 (60ml) was malignantprofile, because of high risk of symptomatic intracerebral hemorrhage and mortality. Symptomatic hemorrhage in experimental group was only 3%, as a low percentage of complications after reperfusion therapy.<br />CONCLUSION: CTP is emergency and rapid technique, which provides unique information about AIS, helps with clinical decision making and could be surrogate biomarker in prediction of clinical outcome.</p>

Made available in DSpace on 2014-12-17T14:25:23Z (GMT). No. of bitstreams: 1 AbdoFN_TESE.pdf: 1739510 bytes, checksum: 7f520b9c4a32fd74e279d017c0bdd143 (MD5) Previous issue date: 2014-03-31 / Foam was developed as a novel vehicle for streptokinase with the purpose of increasing the contact time and area between the fibrinolytic and the target thrombus, which would lead to a greater therapeutic efficacy at lower doses, decreasing the drug s potential to cause bleeding. Fibrinolytic foams were prepared using CO2 and human albumin (at different v:v ratios), as the gas and liquid phases, respectively, and streptokinase at a low total dose (100,000 IU) was used as fibrinolytic agent conveyed in 1 mL of foam and in isotonic saline solution. The foams were characterized as foam stability and apparent viscosity. The thrombolytic effect of the streptokinase foam was determined in vitro as thrombus lysis and the results were compared to those of a fibrinolytic solution (prepared using the same dose of streptokinase) and foam without the fibrinolytic. In vitro tests were conducted using fresh clots were weighed and placed in test tubes kept at 37 ? C. All the samples were injected intrathrombus using a multiperforated catheter. The results showed that both foam stability and apparent viscosity increased with the increase in the CO2:albumin solution ratio and therefore, the ratio of 3:1 was used for the incorporation of streptokinase. The results of thrombus lysis showed that the streptokinase foam presented the highest thrombolytic activity (44.78 ? 9.97%) when compared to those of the streptokinase solution (32.07 ? 3.41%) and the foam without the drug (19.2 ? 7.19%). We conclude that fibrinolytic foam showed statistically significant results regarding the enhancement of the lytic activity of streptokinase compared to the effect of the prepared saline solution, thus it can be a promising alternative in the treatment of thrombosis. However, in vivo studies are needed in order to corroborate the results obtained in vitro / Uma espuma foi desenvolvida como novo ve?culo para a estreptoquinase com vistas a aumentar a ?rea de contato e o tempo de perman?ncia junto ao trombo, de modo a se obter maior efici?ncia terap?utica em doses menores, diminuindo suas potenciais complica??es hemorr?gicas. A espuma fibrinol?tica foi preparada com CO2, albumina humana e estreptoquinase, em dispositivo desenvolvido para tal fim, com diferentes raz?es de fases g?s/l?quido. Ensaios de estabilidade e viscosidade aparente foram realizados para caracteriza??o das espumas e a escolha da mais est?vel. A estreptoquinase em dose total reduzida (100.000 UI) foi utilizada como fibrinol?tico veiculado em 1 mL de espuma e em solu??o salina isot?nica (0,9%). A espuma sem fibrinol?tico tamb?m foi utilizada como comparativo. Testes in vitro foram realizados utilizando-se co?gulos frescos, que foram pesados e colocados em tubos de ensaio mantidos a 37?C. As espumas com e sem fibrinol?tico e a solu??o fibrinol?tica foram testadas por aplica??o intraco?gulo em doses id?nticas atrav?s de cateter multiperfurado e pistola de inje??o. Os resultados in vitro evidenciaram atrav?s da diminui??o dos pesos dos co?gulos, que a espuma trombol?tica apresentou atividade l?tica de 44,78 ? 9,97%, enquanto as mesmas doses da estreptoquinase em solu??o salina isot?nica promoveram 32,07 ?3,41% de lise dos co?gulos. Na espuma sem fibrinol?tico a redu??o do trombo foi de 19,2 ? 7,19%. Conclui-se que a espuma fibrinol?tica apresentou resultados estatisticamente significativos no tocante ? potencializa??o da atividade l?tica da estreptoquinase, quando comparado ao efeito da solu??o preparada com solu??o salina, podendo ser uma alternativa promissora nos tratamentos das tromboses. Os dados obtidos sinalizam para necessidade de estudos in vivo para comprova??o dos obtidos nos in vitro

The advent of intravenous thrombolytic agents has revolutiontzed the management of patients with acute myocardial infarction and has dramatically altered the morbidity and mortality associated with this condition. The aims of this study in patients presenting with acute myocardial infarction and treated with thrombolytic agents are: 1. To evaluate the efficacy of thrombolytic agents used at Groote Schuur Hospital in terms of (a) patency of the infarct related artery; ( b) short and long-term mortality. 2. To assess the feasibility and safety of combining intravenous beta-adrenergic blockade with intravenous thrombolytic therapy in patients presenting with acute nyocardial infarction. 3. To assess the need for coronary angiography in all patients treated with thrombolytic agents for acute myocardial infarction. 4. To assess the effect on mortality of offering coronary angioplasty or coronary artery bypass grafting only to those patients manifesting spontaneous or inducible ischaemia post infarction.