Troponiny T a I jsou důležitými biomarkery kardiálního poškození, ke stanovení hladin se v současnosti používají vysoce senzitivní diagnostické soupravy. V dospělé populaci má troponin stěžejní význam v diagnostice akutního koronárního syndromu. V pediatrii jsou důvody vyšetření troponinu odlišné, nejčastější indikací je akutní myokarditida infekční i neinfekční etiologie. Hladina troponinu vylučuje nebo do značné míry potvrzuje toto onemocnění a koreluje se závažností, nepredikuje ale pozdní dysfunkci myokardu. Přesto troponin, spolu s natriuretickými peptidy, lze využít při sledování kardiomyopatií k predikci komplikací a prognózy. U vrozených srdečních vad se troponin nejčastěji využívá v hodnocení pooperačního průběhu. V souvislosti s diagnostikou ischemie myokardu má u dětí troponin význam při suspekci na patologii koronárních arterií u Kawasakiho choroby, postkovidového syndromu, vrozených anomálií nebo při stavech po chirurgické koronární intervenci. Dalšími možnými indikacemi vyšetření troponinu jsou trauma hrudníku, úraz elektrickým proudem, sepse, renální selhání, intoxikace oxidem uhelnatým, arytmie, kardiotoxická léčba či endokrinní a neuromuskulární choroby. Vždy je nutné znát normy pro danou diagnostickou soupravu a typ troponinu, posouzení dynamiky hodnot v čase a korelace s klinickým vyšetřením a dalšími diagnostickými metodami.
Troponins T and I are important biomarkers of cardiac damage, the levels of which are currently determined by highly sensitive diagnostic kits. In the adult population, troponin is of central importance in the diagnosis of acute coronary syndrome. In pediatrics, the reasons for troponin testing are different, with acute myocarditis of infectious or non-infectious aetiology being the most common indication. Troponin levels can rule out or to a great degree confirm this disease and correlate with its severity; the levels, however, can not reliably predict late myocardial dysfunction. Still, troponin, along with natriuretic peptides, can be used in the monitoring of cardiomyopathies to predict complications and prognosis. In congenital heart disease, troponin is most commonly used to evaluate the postoperative course. In the context of diagnosing myocardial ischemia in children, troponin is important when coronary artery pathology is suspected in Kawasaki disease, post-COVID syndrome, congenital anomalies, or after surgical coronary interventions. Other possible indications for troponin testing include chest trauma, electric shock, sepsis, renal failure, carbon monoxide intoxication, arrhythmias, cardiotoxic therapy, or endocrine and neuromuscular diseases. It is always necessary to know the normal values for the used diagnostic kit and the type of troponin, to assess the dynamics of values over time and to correlate the laboratory results with clinical examination and other diagnostic methods.
- MeSH
- biologické markery * analýza MeSH
- dítě MeSH
- kardiomyopatie diagnóza MeSH
- kardiotoxicita MeSH
- lidé MeSH
- myokarditida diagnóza MeSH
- troponin I * analýza MeSH
- troponin T * analýza MeSH
- vrozené srdeční vady MeSH
- Check Tag
- dítě MeSH
- lidé MeSH
- Publikační typ
- přehledy MeSH
BACKGROUND: The clinical relevance of cardiac troponin (cTn) elevation in takotsubo syndrome (TTS) remains uncertain. The present study sought to investigate the role of cardiac troponin (cTn) elevations in mortality prediction of patients with Takotsubo syndrome (TTS). METHODS: Patients enrolled in the International Takotsubo (InterTAK) Registry from January 2011 to February 2020 with available data on peak cTn levels were included in the analysis. Peak cTn levels during the index hospitalization were used to define clinically relevant myocardial injury. The threshold at which clinically relevant myocardial injury drives mortality at 1 year was identified using restricted cubic spline analysis. RESULTS: Out of 2'938 patients, 222 (7.6%) patients died during 1-year follow-up. A more than 28.8-fold increase of cTn above the upper reference limit was identified as threshold for clinically relevant myocardial injury. The presence of clinically relevant myocardial injury was significantly associated with an increased risk of mortality at 5 years (adjusted HR 1.58, 95% CI 1.18-2.12, p =.002). Clinically relevant myocardial injury was related to an increased 5-year mortality risk in patients with apical TTS (adjusted HR 1.57, 95% CI 1.21-2.03, p =.001), in presence of physical stressors (adjusted HR 1.60, 95% CI 1.22-2.11, p =.001), and in absence of emotional stressors (adjusted HR 1.49, 95% CI, 1.17-1.89, p =.001). CONCLUSION: This study for the first time determined a troponin threshold for the identification of TTS patients at excess risk of mortality. These findings advance risk stratification in TTS and assist in identifying patients in need for close monitoring and follow-up.
- MeSH
- lidé středního věku MeSH
- lidé MeSH
- registrace * MeSH
- senioři nad 80 let MeSH
- senioři MeSH
- takotsubo kardiomyopatie * krev mortalita MeSH
- troponin I krev MeSH
- troponin T * krev MeSH
- troponin krev metabolismus MeSH
- Check Tag
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- senioři nad 80 let MeSH
- senioři MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
In this study, we investigated the mechanism underlying electrocardiogram (ECG) alterations in a rabbit model of acute pulmonary thromboembolism (PTE). Twelve healthy adult New Zealand white rabbits were used, with eight in the experimental group (PTE group) and four in the control group. After developing the rabbit model of acute PTE, ECG and coronary angiography were performed. HE staining was conducted on the right and left ventricular tissues, and polymerase chain reaction (PCR) was used to determine brain natriuretic peptide (BNP), tumor necrosis factor-alpha (TNF-?), and Troponin I (TNI) mRNA expression in the myocardium. There were considerable changes in the ST segment of the ECG in the PTE group. Coronary angiography revealed the absence of spasm, stenosis, and occlusion. In the plasma of the PTE group, the levels of D-dimer, BNP, TNF-?, and TNI were significantly elevated, and these changes were statistically significant (P<0.05). PCR analysis of ventricular myocardial tissue indicated significantly higher levels of BNP, TNF-?, and TNI mRNA in the PTE group than in the control group. These differences were statistically significant (P<0.05). The ST-T variations on the ECG of rabbits with acute PTE correlate strongly with the temporary changes in right heart volume caused by acute PTE. Keywords: Animal model of pulmonary embolism, B-type natriuretic peptide, Electrocardiogram, Pulmonary thromboembolism, Troponin I, Tumor necrosis factor-alpha.
- MeSH
- akutní nemoc MeSH
- elektrokardiografie * MeSH
- králíci MeSH
- modely nemocí na zvířatech * MeSH
- natriuretický peptid typu B krev MeSH
- plicní embolie * patofyziologie krev MeSH
- TNF-alfa krev metabolismus genetika MeSH
- troponin I krev metabolismus MeSH
- zvířata MeSH
- Check Tag
- králíci MeSH
- mužské pohlaví MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
BACKGROUND: Point-of-care (POC) high-sensitivity cardiac troponin assays may further accelerate the diagnosis of myocardial infarction (MI). OBJECTIVES: This study sought to assess the clinical and analytical performance of the novel high-sensitivity cardiac troponin I (hs-cTnI)-SPINCHIP POC test. METHODS: Adult patients presenting with acute chest discomfort to the emergency department were enrolled in an international, diagnostic, multicenter study. The final diagnosis was centrally adjudicated by 2 independent cardiologists using all clinical information. We compared the discriminatory performance of hs-cTnI-SPINCHIP with current established central laboratory assays and derived an assay-specific hs-cTnI-SPINCHIP 0/1-hour algorithm. Secondary analyses included sample type comparisons (whole blood, fresh/frozen plasma, and capillary finger prick) and precision analysis. RESULTS: MI was the adjudicated final diagnosis in 214 (19%) of 1,102 patients. Area under the receiver-operating characteristic curve was 0.94 (95% CI: 0.92-0.95) for hs-cTnI-SPINCHIP vs 0.94 (95% CI: 0.92-0.95) for hs-cTnI-Architect (P = 0.907) and 0.93 (95% CI: 0.91-0.95) for high-sensitivity cardiac troponin T Elecsys (P = 0.305). A cutoff <7 ng/L at presentation (if chest pain onset was >3 hours) or <7 ng/L together with a 0/1-hour delta of <4 ng/L ruled out 51% with a sensitivity and negative predictive value of 100% (95% CI: 97.7%-100%) and 100% (95% CI: 99.0%-100%), respectively. A hs-cTnI-SPINCHIP concentration ≥36 ng/L or a 0/1-hour delta ≥11 ng/L ruled in 27% with a specificity and positive predictive value of 90.9% (95% CI: 88.3%-92.9%) and 72.9% (95% CI: 66.4%-78.6%), respectively. Bootstrap internal validation confirmed excellent diagnostic performance. High agreement was observed between different sample types. CONCLUSIONS: The SPINCHIP hs-cTnI POC test has very high diagnostic accuracy. Its assay-specific 0/1-hour algorithm achieved very high sensitivity/negative predictive value and specificity/positive predictive value for rule-out/in MI. (Advantageous Predictors of Acute Coronary Syndromes Evaluation [APACE] Study [APACE]; NCT00470587).
- MeSH
- biologické markery krev MeSH
- infarkt myokardu * krev diagnóza MeSH
- lidé středního věku MeSH
- lidé MeSH
- prospektivní studie MeSH
- senioři MeSH
- senzitivita a specificita MeSH
- troponin I * krev MeSH
- vyšetření u lůžka MeSH
- Check Tag
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- senioři MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- multicentrická studie MeSH
INTRODUCTION: Chronic effects of noninvasive ventilation on myocardial function in patients with obesity hypoventilation syndrome (OHS) are scarcely understood. The aim of the present study was to evaluate the long-term effects of volume-targeted bilevel positive airway pressure ventilation (BiPAP) on cardiac parameters and myocardial biomarkers in patients with OHS. METHODS: Clinically stable patients with OHS referred to the tertiary center for the initiation of long-term BiPAP therapy were consecutively enrolled. At baseline, all participants underwent overnight cardiorespiratory polygraphy. BiPAP therapy using volume-targeted spontaneous/timed mode delivered via an oro-nasal mask was initiated. Beat-to-beat noninvasive monitoring by impedance cardiography was used to assess heart function at baseline and after 3 and 12 months of BiPAP use. Serum troponin 1, N-Terminal Pro-B-Type Natriuretic Peptide (NT-ProBNP), tumor necrosis factor-alpha (TNF-α), and interleukin-6 (IL-6) were monitored. RESULTS: Thirteen patients (10 men; mean age, 55.8 ± 9.8 years; mean body mass index of 47.8 ± 5.9 kg/m2) were recruited. From baseline to 3, and to 12 months of BiPAP use, left ventricular stroke volume (SV), ejection time (LVET), and ejection time index significantly increased (P = 0.030; P < 0.001; P = 0.003, respectively), while heart rate and systolic time ratio significantly decreased (P = 0.004; P = 0.034, respectively). Reductions in serum NT-proBNP, IL-6 and TNF-α were observed (P = 0.045; P = 0.018; P = 0.003, respectively). No significant changes in serum troponin were detected throughout the study. CONCLUSIONS: The present findings of increased SV, in association with lengthening of LVET, reductions of NT-proBNP and reductions in circulatory inflammatory markers in patients with stable OHS and chronic moderate-to-severe daytime hypercapnia treated with BiPAP over 1 year support the role of this therapeutic mode in such patients.
- MeSH
- biologické markery * krev MeSH
- časové faktory MeSH
- hypoventilační syndrom při obezitě * terapie patofyziologie MeSH
- interleukin-6 * krev MeSH
- kardiografie impedanční MeSH
- lidé středního věku MeSH
- lidé MeSH
- natriuretický peptid typu B * krev MeSH
- neinvazivní ventilace * metody MeSH
- peptidové fragmenty * krev MeSH
- senioři MeSH
- TNF-alfa krev MeSH
- troponin I krev MeSH
- ventilace umělá s výdechovým přetlakem metody MeSH
- Check Tag
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- senioři MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
BACKGROUND: The current obstructive sleep apnea (OSA) diagnostic uses polysomnography or limited polygraphy and requires specialized personnel and technical equipment. Glycoprotein biomarkers and microRNAs are being explored as a possible new method for screening. We aimed to evaluate whether certain biomarkers and microRNA, previously identified as related to OSA, could be influenced by factors such as gender, age, and obesity level in patients with OSA. METHODS: In this retrospective analytical study, patients with moderate to severe OSA (n = 130) were compared with the control group. Serum levels of selected biomarkers and microRNA were taken from both groups. The group of OSA patients was then stratified by gender, obesity level, and age to see the possible influence of those variables on biomarker levels. RESULTS: Levels of all studied biomarkers - C-reactive protein (CRP), high-sensitivity troponin I (hsTnI), pentraxin-3 (PTX-3), and microRNA-499 were significantly higher in patients with OSA compared to the control group. In the OSA group only hsTnI showed a statistically significant relationship with gender. Levels of CRP and hsTnI showed a significant dependence on the level of obesity. Dependency on age was proven for hsTnI. CRP, PTX-3, and microRNA-499 did not have any statistically significant relationship with age. CONCLUSION: We found that serum levels of pentraxin-3 and microRNA-499 in patients with moderate to severe obstructive sleep apnoea are independent of gender, obesity, and age. CRP was affected by the level of obesity and hsTnI was influenced by all 3 variables. We consider these findings important for further research of OSA biomarkers.
- MeSH
- biologické markery * krev MeSH
- C-reaktivní protein * analýza metabolismus MeSH
- dospělí MeSH
- glykoproteiny krev genetika MeSH
- lidé středního věku MeSH
- lidé MeSH
- mikro RNA * krev MeSH
- obezita * krev genetika MeSH
- obstrukční spánková apnoe * krev genetika MeSH
- retrospektivní studie MeSH
- senioři MeSH
- sérový amyloidový protein metabolismus analýza genetika MeSH
- sexuální faktory MeSH
- troponin I krev MeSH
- věkové faktory MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- senioři MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
AIM: We present two cases with clearly discrepant results of clinical examination and cardiac troponin I (cTnI) and cardiac troponin T (cTnT) concentrations. In similar cases with discrepant results, the possibility of interference should be considered. METHODS: Due to the suspicion of the presence of macrotroponin I in both of the presented cases, the patients were invited to our laboratory and both cTnI (Architect i1000, Abbott) and cTnT (Cobas 8000, Roche) concentrations were analysed. The samples were treated by preincubation in a heterophilic antibodies blocking tube (HBT) and analysed. Precipitation with polyethylene glycol solution (PEG) and molecular weight separation by gel filtration on Sephadex G100 was performed and concentrations of cTnI were analysed. RESULTS: In the same blood sample, the cTnT and cTnI concentrations were 7 and 1782 ng/L, respectively, in Case 1, and 6 and 96 ng/L, respectively, in Case 2. Incubation of samples in HBT had no significant effect. CTnI concentrations after precipitation with PEG - presented as the percentage of initial concentrations - were 7.4% in Case 1 (and 26.8% in the control sample) and 1.4% in Case 2 (and 56.0% in the control sample). These results indicate a significant decrease in both cases, supporting presence of macrotroponin I. Finally, analyses of cTnI concentrations after gel filtration also supported the presence of macrotroponin I. CONCLUSION: The present cases show that the presence of macrotroponin can lead to unnecessary investigation of the patient. When the possibility of interference is suspected, cooperation with laboratory staff to help with interpretation or to perform more detailed analysis is crucial.
- MeSH
- biologické markery krev MeSH
- lidé středního věku MeSH
- lidé MeSH
- senioři MeSH
- troponin I * krev MeSH
- troponin T * krev MeSH
- Check Tag
- lidé středního věku MeSH
- lidé MeSH
- mužské pohlaví MeSH
- senioři MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- kazuistiky MeSH
BACKGROUND: We aimed to assess the diagnostic utility of the Dimension EXL LOCI High-Sensitivity Troponin I (hs-cTnI-EXL) assay. METHODS: This multicenter study included patients with chest discomfort presenting to the emergency department. Diagnoses were centrally and independently adjudicated by two cardiologists using all available clinical information. Adjudication was performed twice including serial measurements of high-sensitivity cardiac troponin (hs-cTn) I-Architect (primary analysis) and serial measurements of hs-cTnT-Elecsys (secondary analysis) in addition to the clinically used (hs)-cTn. The primary objective was to assess and compare the discriminatory performance of hs-cTnI-EXL, hs-cTnI-Architect and hs-cTnT-Elecsys for acute myocardial infarction (MI). Furthermore, we derived and validated a hs-cTnI-EXL-specific 0/1h-algorithm. RESULTS: Adjudicated MI was the diagnosis in 204/1454 (14%) patients. The area under the receiver operating characteristics curve for hs-cTnI-EXL was 0.94 (95%CI, 0.93-0.96), and comparable to hs-cTnI-Architect (0.95; 95%CI, 0.93-0.96) and hs-cTnT-Elecsys (0.93; 95%CI, 0.91-0.95). In the derivation cohort (n = 813), optimal criteria for rule-out of MI were <9ng/L at presentation (if chest pain onset >3h) or <9ng/L and 0h-1h-change <5ng/L, and for rule-in ≥160ng/L at presentation or 0h-1h-change ≥100ng/L. In the validation cohort (n = 345), these cut-offs ruled-out 56% of patients (negative predictive value 99.5% (95%CI, 97.1-99.9), sensitivity 97.8% (95%CI, 88.7-99.6)), and ruled-in 9% (positive predictive value 83.3% (95%CI, 66.4-92.7), specificity 98.3% (95%CI, 96.1-99.3)). Secondary analyses using adjudication based on hs-cTnT measurements confirmed the findings. CONCLUSIONS: The overall performance of the hs-cTnI-EXL was comparable to best-validated hs-cTnT/I assays and an assay-specific 0/1h-algorithm safely rules out and accurately rules in acute MI. CLINICAL TRIAL REGISTRATION: ClinicalTrials.gov number, NCT00470587.
- MeSH
- biologické markery MeSH
- infarkt myokardu * diagnóza MeSH
- lidé MeSH
- prospektivní studie MeSH
- ROC křivka MeSH
- troponin I * MeSH
- troponin T MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- multicentrická studie MeSH
Cíl studie: Určit limitující faktory pro případný přechod mezi dvěma typy troponinů (cTn) stanovených „high-sensitivity“ metodami (hs-cTnT a hs-cTnI) v reálné klinické situaci. Typ studie: Observační studie. Název a sídlo pracoviště: Akutní příjem Kardiocentra Institutu klinické a experimentální medicíny (IKEM), Praha. Materiál a metody: Paralelní testování hs-cTnT (Cobas, Roche) a hs-cTnI (Architect, Abbott) v souboru 567 pacientů urgentního kardiologického příjmu. Určení shody mezi metodami (Passing-Bablok), výpočet časového intervalu mezi měřeními, hodnocení delta koncentrace hs-cTn mezi dvěma po sobě jdoucími odběry, porovnání klasifikace. Časy mezi odběry byly rozděleny do tercilů, delta stanovena pouze pro interval mezi odběry do 6 hodin. Klasifikace shody pro rule-in a rule-out diagnostiku hodnocena podle ESC Guidelines 2020 s využitím kappa statistiky. Výsledky: Získáno bylo 821 párů vyšetření hs-cTnT a hs-cTnI. Porovnání metod (Passing-Bablok): směrnice 3,07 (95% CI 2,77 až 3,40), intercept -30,1 (95% CI -3,9 až -25,0), rovnice přímky hs-cTnI = -30,4 + 3,07 * hs-cTnT, r= 0,934, p<0,001. V 1. (42-65 minut), ve 2. (66-112 minut) a ve 3. (115-359 minut) tercilu byly delty koncentrace (median a IQR) 3,3 (1,5-5,7); 2,6 (1,3-4,5); 48,5 (3,7-172,7) ng/L pro hs-cTnT a 1,4 (0,4-2,9); 1,6 (0,6-9,5); 57,8 (5,5-755,9) ng/L pro hs-cTnI. Shoda klasifikace pomocí hs-cTnT a hs-cTnI pro jednohodinový algoritmus ESC byla 63 % (kappa 0,425), pro dvouhodinový algoritmus 77 % (kappa 0,716). Porovnání klasifikace typu rule-in a rule-out ukázalo pro jedno- i dvouhodinový algoritmus možné přesuny do vyšší nebo nižší kategorie podle použitého hs-cTn. Závěr: Vztah mezi výsledky stanovení hs-cTnT a hs-cTnI existuje, ale neumožňuje přepočet mezi metodami. Sledování ukázalo nedostatečnou adherenci k doporučeným diagnostickým algoritmům, intervaly mezi odběry se značně lišily. Delta koncentrace pro krátký interval mezi odběry je vyšší pro hs-cTnT, pro delší interval je vyšší hodnota delta hs-cTnI. Shoda klasifikace podle jedno- a dvouhodinového algoritmu ESC je střední až dobrá. Přechod od jednoho typu hs-cTn k jinému není triviální a vyžaduje analýzu vlastních laboratorních dat, klinické rozbory a komunikaci s kliniky.
Objective: To assess the limitations of intended change from one type of high sensitivity (hs) cardiac troponin (cTn) to another (hs-cTnT and hs-cTnI) in a real clinical setting. Design: An observation study Settings: Acute emergency unit, Cardiology department, Institute for clinical and experimental medicine (IKEM), Praha. Material and Methods: Parallel testing of hs-cTnT (Cobas, Roche) and hs-cTnI (Architect, Abbott) in 567 consecutive patients of cardiology emergency. Method comparison (Passing-Bablok), calculation of time interval between sampling, assessment of delta concentration between two consecutive concentrations of hs-cTn, and comparison of classification. The time intervals between two consecutive samples were sorted into tertiles, and delta concentration was evaluated for the time interval up to 6 hours. A classification of the agreement for rule-in and rule-out diagnostics was evaluated according to the ESC Guidelines 2020 (kappa statistics). Results: There were 821 pairs of hs-cTnT and hs-cTnI results. Passing-Bablok test revealed a slope of 3.07 (95% CI 2.77- 3.40), an intercept of -30.1 (95% CI -3.9 to -25.0), the equation was hs-cTnI = -30.4 + 3.07 * hs-cTnT, r= 0.934, p<0.001. The delta concentrations in the 1st tertile (42-65 min), 2nd tertile (66-112 min), and 3rd tertile (115-359 min) were (median and IQR) 3.3 (1.5-5.7); 2.6 (1.3-4.5); 48.5 (3.7-172.7) ng/L for hs-cTnT and 1.4 (0.4-2.9); 1.6 (0.6-9.5); 57.8 (5.5-755.9) ng/L for hs-cTnI. The classification agreement between hs-cTnT and hs-cTnI (ESC 1hour algorithm) was 63 % (kappa 0.425) and 77 % (kappa 0.716) for ESC 2-hour algorithm). The comparison of rule-in and rule-out classification revealed up- and down classification both for hs-cTnT and hs-cTnI. Conclusion: A relationship between hs-cTnT and hs-cTnI exists, however, recalculation is impossible. A study revealed a low adherence to the recommended diagnostic algorithms with very high variability in the time intervals between sampling. The delta concentration of hs-cTnT is lower than the delta concentration of hs-cTnI for a shorter interval between samples, and vice versa, the delta concentration of hs-cTnI is higher with the longer time interval between samples. The classification agreement between hs-cTnT and hs-cTnI was moderate for the ESC 1-hour algorithm and suitable for the ESC 2hour algorithm. Switching from one type of high-sensitivity cardiac troponin to another is not trivial, and real data analysis, clinical assessment, and communication with clinicians is required.
Surface engineering of upconverting nanoparticles (UCNPs) is crucial for their bioanalytical applications. Here, an antibody specific to cardiac troponin I (cTnI), an important biomarker for acute myocardial infection, was covalently immobilized on the surface of UCNPs to prepare a label for the detection of cTnI biomarker in an upconversion-linked immunoassay (ULISA). Core-shell UCNPs (NaYF4:Yb,Tm@NaYF4) were first coated with poly(methyl vinyl ether-alt-maleic acid) (PMVEMA) and then conjugated to antibodies. The morphology (size and uniformity), hydrodynamic diameter, chemical composition, and amount of coating on the of UCNPs, as well as their upconversion luminescence, colloidal stability, and leaching of Y3+ ions into the surrounding media, were determined. The developed ULISA allowed reaching a limit of detection (LOD) of 0.13 ng/ml and 0.25 ng/ml of cTnI in plasma and serum, respectively, which represents 12- and 2-fold improvement to conventional enzyme-linked immunosorbent based on the same immunoreagents.
- MeSH
- imunoanalýza metody MeSH
- limita detekce MeSH
- luminiscence MeSH
- nanočástice * chemie MeSH
- troponin I analýza MeSH
- Publikační typ
- časopisecké články MeSH
