Search results for "Coronary vessel"

showing 10 items of 112 documents

Prostaglandin A2 (PGA2) increases the coronary vascular resistance in the guinea-pig isolated heart preparation.

1977

Prostaglandin A2 (PGA2) in concentrations of 1.5·10−8 to 3·10−6 M was found to produce concentration-dependent increase in the coronary vascular resistance of the guinea-pig isolated heart without alterations in myocardial contractile force and oxygen consumption.

Isolated Heart PreparationMalemedicine.medical_specialtyGuinea PigsProstaglandinPharmacologyGuinea pigCellular and Molecular Neurosciencechemistry.chemical_compoundInternal medicinemedicineAnimalsMolecular BiologyPharmacologyProstaglandins ADose-Response Relationship Drugbusiness.industryCell BiologyIsolated heartCoronary VesselsMyocardial Contractionmedicine.anatomical_structurechemistryVascular resistanceCardiologyMolecular MedicineFemaleVascular ResistancebusinessExperientia
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Early and midterm outcomes of bioresorbable vascular scaffolds for ostial coronary lesions: insights from the GHOST-EU registry.

2016

Aims: We aimed to investigate the outcomes of bioresorbable vascular scaffolds (BVS) in coronary ostial lesions. Ostial lesions represent a challenging angiographic subset, with higher event rates compared with non-ostial lesions. BVS might be associated with advantages over the long term, but their safety in this setting remains to be explored. Methods and results: Procedural and 12-month follow-up data from consecutive patients treated with BVS for lesions located at the ostium of the right (RCA), left anterior (LAD) or circumflex (LCX) coronary in 11 European centres were collected. The primary device-oriented endpoint was defined as a combination of cardiovascular death, target vessel m…

LCX (29Target lesionMale52%). Patients presenting with ostial lesions did not differ from the remaining cohort except for a higher incidence of prior revascularisation. Predilation was performed in 97% of the lesions (vs. 96% in non-ostialp= 0.035)medicine.medical_treatmentMyocardial Infarction304 patients with a mean age of 62 +/- 11years. There were 90 ostial lesions (5.8%) in 84 patients (6.4%) located at the ostial RCA (14Coronary Artery Disease030204 cardiovascular system & hematologyCoronary artery diseasebut their safety in this setting remains to be explored. Methods and results: Procedural and 12-month follow-up data from consecutive patients treated with BVS for lesions located at the ostium of the right (RCA)0302 clinical medicineAbsorbable Implants030212 general & internal medicineMyocardial infarctionCircumflexRegistriesTissue Scaffolds32%)Drug-Eluting StentsMiddle AgedThrombosisCoronary VesselsAims: We aimed to investigate the outcomes of bioresorbable vascular scaffolds (BVS) in coronary ostial lesions. Ostial lesions represent a challenging angiographic subset with higher event rates compared with non-ostial lesions. BVS might be associated with advantages over the long term but their safety in this setting remains to be explored. Methods and results: Procedural and 12-month follow-up data from consecutive patients treated with BVS for lesions located at the ostium of the right (RCA) left anterior (LAD) or circumflex (LCX) coronary in 11 European centres were collected. The primary device-oriented endpoint was defined as a combination of cardiovascular death target vessel myocardial infarction or target lesion revascularisation. The database included a total of 1549 lesions in 1304 patients with a mean age of 62 +/- 11years. There were 90 ostial lesions (5.8%) in 84 patients (6.4%) located at the ostial RCA (14; 16%) LCX (29; 32%) or LAD (47; 52%). Patients presenting with ostial lesions did not differ from the remaining cohort except for a higher incidence of prior revascularisation. Predilation was performed in 97% of the lesions (vs. 96% in non-ostial p= 0.618) post-dilation in 43% (versus 58% in the non-ostial group p= 0.008). At quantitative coronary angiography treatment of ostial lesions was associated with higher residual stenosis (30% [23-41] vs. 26% [20-37] p= 0.035) but no difference in minimum lumen diameter existed (p= 0.447). Follow-up data were available at 385 [362-465] days. The 12-month Kaplan-Meier estimated rates of scaffold thrombosis were 4.9% and 2.0% (ostial and non-ostial lesion groups respectively log-rank p= 0.005). The device-oriented composite endpoint occurred respectively in 12.6% and 4.6% at 12 months (log-rank p= 0.001). Treatment of ostial lesions was an independent predictor of this endpoint (p= 0.0025 HR 2.65 [1.41-4.97]).OstiumAims: We aimed to investigate the outcomes of bioresorbable vascular scaffolds (BVS) in coronary ostial lesions. Ostial lesions represent a challenging angiographic subsetTreatment Outcomein 12.6% and 4.6% at 12 months (log-rank p= 0.001). Treatment of ostial lesions was an independent predictor of this endpoint (p= 0.0025CardiologyFemale549 lesions in 1medicine.symptomCardiology and Cardiovascular MedicineAdultpost-dilation in 43% (versus 58% in the non-ostial groupmedicine.medical_specialtyor LAD (47HR 2.65 [1.41-4.97])but no difference in minimum lumen diameter existed (p= 0.447). Follow-up data were available at 385 [362-465] days. The 12-month Kaplan-Meier estimated rates of scaffold thrombosis were 4.9% and 2.0% (ostial and non-ostial lesion groupsrespectivelyLesion03 medical and health sciencesPercutaneous Coronary Interventionwith higher event rates compared with non-ostial lesions. BVS might be associated with advantages over the long termleft anterior (LAD) or circumflex (LCX) coronary in 11 European centres were collected. The primary device-oriented endpoint was defined as a combination of cardiovascular deathInternal medicinemedicineHumanstarget vessel myocardial infarction or target lesion revascularisation. The database included a total of 1Agedp= 0.008). At quantitative coronary angiographybusiness.industryPercutaneous coronary interventionp= 0.618)treatment of ostial lesions was associated with higher residual stenosis (30% [23-41] vs. 26% [20-37]log-rank p= 0.005). The device-oriented composite endpoint occurredmedicine.diseaseSurgery16%)businessEuroIntervention : journal of EuroPCR in collaboration with the Working Group on Interventional Cardiology of the European Society of Cardiology
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Chronic Administration of Quercetin Induces Biomechanical and Pharmacological Remodeling in the Rat Coronary Arteries

2017

Acute dilation brought about by the dietary flavonoid quercetin in coronary arterioles has been described earlier, but no information is available on its chronic effects. Male Wistar rats (body weight about 190 g) were divided to two groups: the quercetin-treated group (n=22) had quercetin supplementation of approximately 30 mg/kg/day, whereas the control group (n=20) had none. After eight weeks of treatment, intramural coronary arterioles with identical passive diameters (178+/-14 microm and 171+/-9 microm) were prepared and their biomechanics and pharmacological reactivities were tested using pressure arteriography ex vivo. The spontaneous tone of quercetin-treated arteries was higher (16…

Male0301 basic medicinemedicine.medical_specialtyPhysiologyVasodilator AgentsLumen (anatomy)Vascular Remodeling030204 cardiovascular system & hematologyBody weightDrug Administration ScheduleNitric oxide03 medical and health scienceschemistry.chemical_compoundCoronary circulation0302 clinical medicineInternal medicinemedicineAnimalsRats WistarNo releaseGeneral MedicineCoronary VesselsRatsVasodilationCoronary arteries030104 developmental biologyEndocrinologymedicine.anatomical_structurechemistryQuercetinQuercetinEx vivoPhysiological Research
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Plaque and blood vulnerability in ST segment elevation myocardial infarction patients: association between lesion morphology using intravascular ultr…

2013

AIM The purpose of the study was to evaluate associations between iMap intravascular ultrasound tissue characterization of culprit and nonculprit lesions in infarct-related artery and plasma biomarkers during ST segment elevation myocardial infarction (STEMI) and at 10-month follow-up. METHODS AND RESULTS Sixty-three STEMI patients at the time of index hospitalization and 10-month follow-up underwent coronary angiography and intravascular ultrasound with iMap tissue characterization of the culprit artery. Proximal and culprit segments were analyzed. A higher percentage of necrotic tissue in the nonculprit segment was found in patients in the top soluble intercellular adhesion molecule 1 (sI…

MaleAcute coronary syndromemedicine.medical_specialtyTime FactorsMyocardial InfarctionCoronary AngiographyCulpritLesionchemistry.chemical_compoundNecrosisPercutaneous Coronary InterventionPredictive Value of TestsInternal medicineIntravascular ultrasoundPlasminogen Activator Inhibitor 1medicineST segmentHumansMyocardial infarctionProspective StudiesUltrasonography InterventionalAgedmedicine.diagnostic_testbusiness.industryGeneral MedicineMiddle Agedmedicine.diseaseIntercellular Adhesion Molecule-1Coronary VesselsFibrosisPlaque Atheroscleroticmedicine.anatomical_structureTreatment OutcomechemistryPlasminogen activator inhibitor-1CardiologyFemalemedicine.symptomCardiology and Cardiovascular MedicinebusinessBiomarkersArteryCoronary artery disease
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Coronary artery calcium and physical performance as determinants of mortality in older age: The AGES-Reykjavik Study

2013

Background. Coronary artery calcium (CAC) and physical performance have been shown to be associated with mortality, but it is not clear whether one of them modifies the association. We investigated the association between the extent of CAC and physical performance among older individuals and explored these individual and combined effects on cardiovascular disease (CVD) mortality and non-CVD mortality. Methods. We studied 4074 participants of the AGES–Reykjavik Study who were free from coronary heart disease, had a CAC score calculated from computed tomography scans and had data on mobility limitations and gait speed at baseline in 2002–2006 at a mean age of 76 years. Register-based mortalit…

MaleAgingcardiovascular disease risk factorsEpidemiologyIcelandikääntyneet henkilötDiseaseCoronary Artery DiseaseCoronary artery calcificationCardiovascular disease risk factorsCoronary AngiographySeverity of Illness IndexCoronary artery diseaseRisk FactorsEpidemiologyProspective StudiesepidemiologiaProspective cohort studyAge FactorsCalcinosista3141Coronary VesselsSurvival RateCoronary artery calciumCardiologyfyysinen suorituskykyFemaleCardiology and Cardiovascular Medicinekuolleisuusmedicine.medical_specialtyateroskleroosisepelvaltimoiden kalkkeumaMotor ActivityArticleInternal medicineSeverity of illnessMultidetector Computed TomographymedicineHumanscardiovascular diseasesMortalitySurvival rateAgedbusiness.industryagingnutritional and metabolic diseasesmedicine.diseaseAtherosclerosisGaitcoronary artery calcificationSurgeryCalciumbusinessTomography X-Ray ComputedFollow-Up StudiesInternational Journal of Cardiology
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Takotsubo Cardiomyopathy: One More Angiographic Evidence of Microvascular Dysfunction

2017

Background Takotsubo cardiomyopathy (TC) aetiology has not been completely understood yet. One proposed pathogenic mechanism was coronary microvascular dysfunction (MVD). This study compared coronary flow and myocardial perfusion in patients with TC, microvascular angina (MVA), and a control group (CG). Methods Out of 42 consecutive patients presented to our centre with TC from 2013 to 2017; we retrospectively selected 27 patients. We compared them with a sex- and age-matched group of 27 MVA cases and 27 patients with normal coronary arteries (CG). The flow was evaluated in the three coronary arteries as TIMI flow and TIMI frame count (TFC). Myocardial perfusion was studied with Blush-Score…

MaleArticle Subjectlcsh:RMyocardial Infarctionlcsh:MedicineMiddle AgedCoronary AngiographyCoronary VesselsEchocardiographyTakotsubo CardiomyopathyCoronary CirculationMicrovesselsHumansFemaleBlood Flow VelocityAgedRetrospective StudiesResearch ArticleBioMed Research International
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High-Frequency rotablation of occluded coronary artery during heart catheterization

1989

High-frequency rotation atherectomy of an occluded left circumflex coronary artery was performed in a 45-year-old man. Over a 0.009 inch flexible tip steel wire a diamond-coated brass burr fasten to a flexible drive shaft that rotates and tracks was advanced. The drive shaft was connected to a turbine and driven by compressed air with 150,000 rpm. After rotablation of the posterior lateral branch over 3 cm with a 1.5 mm burr and rotablation with a 1.75 mm burr of the posterior branch of the left circumflex coronary artery the vessel was reopened with a smooth surface without perforation and dissection. 24 h control and 6 mo control revealed an open coronary vessel. High frequency rotating c…

MaleCardiac Catheterizationmedicine.medical_specialtyRotationmedicine.medical_treatmentPerforation (oil well)Myocardial InfarctionDissection (medical)Coronary AngiographyCoronary artery diseaseAtherectomyAngioplastyInternal medicineHumansMedicinebusiness.industryMiddle Agedmedicine.diseaseCoronary arteriesmedicine.anatomical_structureHeart catheterizationCoronary vesselCardiologyCardiology and Cardiovascular MedicinebusinessAngioplasty BalloonCatheterization and Cardiovascular Diagnosis
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Prevalence of coronary artery intramyocardial course in a large population of clinical patients detected by multislice computed tomography coronary a…

2008

Background: Intramyocardial course, an inborn coronary anomaly, is defined as a segment of a major epicardial coronary artery that runs intramurally through the myocardium; in particular, we distinguish myocardial bridging, in which the vessel returns to an epicardial position after the muscle bridge, and intramyocardial course, which is described as a vessel running and ending in the myocardium. Purpose: To evaluate the prevalence of myocardial bridging and intramyocardial course of coronary arteries as defined by multidetector computed tomography (MDCT) angiography. Material and Methods: The study population consisted of 242 consecutive patients (211 men, 31 women; mean age 59±6 years) w…

MaleChest Painmedicine.medical_specialtyCoronary Vessel AnomaliesContrast MediaCoronary AngiographyChest painCoronary artery diseaseElectrocardiographyImaging Three-DimensionalInternal medicineHeart ratePrevalencemedicineHumansRadiology Nuclear Medicine and imagingMultisliceObserver VariationRadiological and Ultrasound Technologymedicine.diagnostic_testbusiness.industryGeneral MedicineMiddle AgedAtenololmedicine.diseaseIopamidolRadiographic Image EnhancementCoronary arteriesmedicine.anatomical_structurecoronary arteryCTCardiologyFemaleRadiologymedicine.symptomTomography X-Ray ComputedbusinessElectrocardiographymedicine.drugArtery
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Clinical relevance of myocardial bridging detected by coronary CT angiography in patients with atypical chest pain

2019

MaleChest Painmedicine.medical_specialtycoronary CT angiography atypical chest painMyocardial bridgingComputed Tomography AngiographyMyocardial BridgingCoronary Angiographycoronary CT angiographyHumansMedicineClinical significanceIn patientCoronary VesselAgedbusiness.industryAngiographyAtypical chest painCoronary ct angiographyatypical chest painMiddle AgedCoronary VesselsFemaleRadiologyTomography X-Ray ComputedCardiology and Cardiovascular MedicinebusinessHumanMinerva Cardioangiologica
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Influence of increasing convolution kernel filtering on plaque imaging with multislice CT using an ex-vivo model of coronary angiography

2005

PURPOSE: To assess the variability in attenuation of coronary plaques with multislice CT-angiography (MSCT-CA) in an ex-vivo model with varying convolution kernels. MATERIALS AND METHODS: MSCT-CA (Sensation 16, Siemens) was performed in three ex-vivo left coronary arteries after instillation of contrast material solution (Iomeprol 400 mgI/ml, dilution: 1/80). The specimens were placed in oil to simulate epicardial fat. Scan parameters: slices 16/0.75 mm, rotation time 375 ms, feed/rotation 3.0 mm, mAs 500, slice thickness 1 mm, and FOV 50 mm. Datasets were reconstructed using 4 different kernels (B30f-smooth, B36f-medium smooth, B46f-medium, and B60f-sharp). Each scan was scored for the pre…

MaleHistological TechniquesCoronary Artery DiseaseMiddle Agedconvolution kernel filteringCoronary AngiographyCoronary VesselsRisk AssessmentData Interpretation StatisticalHumansFemaleAutopsyTomography X-Ray ComputedAged
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