Úvod: Cílem studie bylo určit rozsah renálního poškození podle gradingu 99mTc-DMSA scanu u dětí s vezikoureterálním refluxem (VUR) III. stupně, který je částí odborné veřejnosti považován spolu s VUR I. a II. stupně za nízkostupňový. Metody: Celkem bylo vyšetřeno 132 pacientů (56 chlapců a 76 dívek ve věku 6 měsíců až 11 let) s diagnózou VUR různého stupně 6 měsíců po akutní pyelonefritidě. Statická scintigrafie ledvin byla provedena 2 hodiny po i.v. podání 18–80 MBq 99mTc-DMSA. Stanovení stupně postižení ledvin bylo provedeno podle počtu postižených segmentů ledviny (0–12) na základě gradingu 99mTc-DMSA G0-G4 (Mattoo et al), s naší modifikací stupně G4. V každé postižené ledvině byl hodnocen počet patologických segmentů/jizev. Průměr hodnot v rámci každého stupně VUR byl vyhodnocen pomocí Studentova t-testu. Výsledky: Hodnoceno celkem 201 ledvin s VUR, významně vyšší počet jizev byl prokázán u VUR III. stupně než u zbylých nízkostupňových stupňů (2,88 vs. 1,58, p = 0,002). Na druhou stranu, ve srovnání se IV. stupněm VUR, se jednalo o nevýznamně nižší hodnotu (2,88 vs. 3,51, p = 0,08). Ve srovnání s VUR IV. a V. stupně byla hodnota statisticky významně nižší (3,99 vs. 2,88, p = 0,004). Závěr: VUR III. stupně je spojen s vyšším rozsahem parenchymových změn (podle 99mTc-DMSA gradingu) ve srovnání s VUR I. a II. stupně. 99mTc-DMSA grading může demaskovat závažnější případy VUR III. stupně, který proto doporučujeme vyčlenit a hodnotit jako samostatný stupeň. Korespondující autorka: MUDr. Daniela Chroustová, Ph.D. Ústav nukleární medicíny VFN a 1. LF UK Praha U nemocnice 5 128 08 Praha 2

Introduction: The aim of this study was to determine the risk of renal damage in children diagnosed with vesico-ureteral reflux (VUR) grade III, which is generally considered as a low-grade VUR, according to the occurrence of renal changes using the 99mTc-DMSA scan grading. Methods: A total of 132 patients with VUR were examined (56 boys, 76 girls aged 6 months -11 years) 6 months after acute pyelonephritis with. Static renal scintigraphy was performed 2 h after i.v. administration of 18-80 MBq 99mTc-DMSA. Determination of the degree of kidney involvement according to the 99mTc-DMSA grading G0-G4 (Mattoo et al) was based on the number of affected segments (0-12). The number of pathological segments/scars was assessed in each involved kidney. Mean values within each VUR grade were evaluated using Student’s t-test. Results: 200 kidneys were evaluated. VUR III. grade demonstrated significantly higher value of scars (2.88 vs 1.58, p = 0.002) than the remaining low-risk grades I and II. On the other hand, when compared with high-risk grade IV, the value was not significantly lower (2,88 vs. 3,51, p = 0,08). In comparing VUR III. with VUR IV.-V. grades, there was a significantly higher number of scars in high-grade VUR. (3.99 vs. 2.88, p = 0.004). Conclusion: VUR III. grade is associated with a higher extend of parenchymal changes (according to 99mTc-DMSA grading) compared to low grades VUR I. and II. 99mTc-DMSA grading can unmask more severe cases of VUR III. degree, which we therefore recommend separating and evaluating as a separate degree.

• MeSH
• dítě MeSH
• kojenec MeSH
• lidé MeSH
• nemoci ledvin diagnostické zobrazování   klasifikace   patologie   MeSH
• předškolní dítě MeSH
• pyelonefritida diagnóza   etiologie   prevence a kontrola   MeSH
• radioisotopová scintigrafie klasifikace   metody   MeSH
• renální insuficience diagnostické zobrazování   diagnóza   etiologie   klasifikace   MeSH
• retrospektivní studie MeSH
• technecium 99mTc dimerkaptojantarová kyselina * analýza   metabolismus   MeSH
• vezikoureterální reflux * diagnostické zobrazování   diagnóza   klasifikace   komplikace   MeSH
• Check Tag
• dítě MeSH
• kojenec MeSH
• lidé MeSH
• předškolní dítě MeSH

Isolated REM sleep behavior disorder (iRBD) is an early stage of synucleinopathy with most patients progressing to Parkinson's disease (PD) or related conditions. Quantitative susceptibility mapping (QSM) in PD has identified pathological iron accumulation in the substantia nigra (SN) and variably also in basal ganglia and cortex. Analyzing whole-brain QSM across iRBD, PD, and healthy controls (HC) may help to ascertain the extent of neurodegeneration in prodromal synucleinopathy. 70 de novo PD patients, 70 iRBD patients, and 60 HCs underwent 3 T MRI. T1 and susceptibility-weighted images were acquired and processed to space standardized QSM. Voxel-based analyses of grey matter magnetic susceptibility differences comparing all groups were performed on the whole brain and upper brainstem levels with the statistical threshold set at family-wise error-corrected p-values <.05. Whole-brain analysis showed increased susceptibility in the bilateral fronto-parietal cortex of iRBD patients compared to both PD and HC. This was not associated with cortical thinning according to the cortical thickness analysis. Compared to iRBD, PD patients had increased susceptibility in the left amygdala and hippocampal region. Upper brainstem analysis revealed increased susceptibility within the bilateral SN for both PD and iRBD compared to HC; changes were located predominantly in nigrosome 1 in the former and nigrosome 2 in the latter group. In the iRBD group, abnormal dopamine transporter SPECT was associated with increased susceptibility in nigrosome 1. iRBD patients display greater fronto-parietal cortex involvement than incidental early-stage PD cohort indicating more widespread subclinical neuropathology. Dopaminergic degeneration in the substantia nigra is paralleled by susceptibility increase, mainly in nigrosome 1.

• MeSH
• lidé MeSH
• mozek diagnostické zobrazování   patologie   MeSH
• Parkinsonova nemoc * komplikace   MeSH
• porucha chování v REM spánku * diagnostické zobrazování   MeSH
• substantia nigra diagnostické zobrazování   patologie   MeSH
• synukleinopatie * komplikace   patologie   MeSH
• železo MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH

OBJECTIVE: To apply a machine learning analysis to clinical and presynaptic dopaminergic imaging data of patients with rapid eye movement (REM) sleep behavior disorder (RBD) to predict the development of Parkinson disease (PD) and dementia with Lewy bodies (DLB). METHODS: In this multicenter study of the International RBD study group, 173 patients (mean age 70.5 ± 6.3 years, 70.5% males) with polysomnography-confirmed RBD who eventually phenoconverted to overt alpha-synucleinopathy (RBD due to synucleinopathy) were enrolled, and underwent baseline presynaptic dopaminergic imaging and clinical assessment, including motor, cognitive, olfaction, and constipation evaluation. For comparison, 232 RBD non-phenoconvertor patients (67.6 ± 7.1 years, 78.4% males) and 160 controls (68.2 ± 7.2 years, 53.1% males) were enrolled. Imaging and clinical features were analyzed by machine learning to determine predictors of phenoconversion. RESULTS: Machine learning analysis showed that clinical data alone poorly predicted phenoconversion. Presynaptic dopaminergic imaging significantly improved the prediction, especially in combination with clinical data, with 77% sensitivity and 85% specificity in differentiating RBD due to synucleinopathy from non phenoconverted RBD patients, and 85% sensitivity and 86% specificity in discriminating PD-converters from DLB-converters. Quantification of presynaptic dopaminergic imaging showed that an empirical z-score cutoff of -1.0 at the most affected hemisphere putamen characterized RBD due to synucleinopathy patients, while a cutoff of -1.0 at the most affected hemisphere putamen/caudate ratio characterized PD-converters. INTERPRETATION: Clinical data alone poorly predicted phenoconversion in RBD due to synucleinopathy patients. Conversely, presynaptic dopaminergic imaging allows a good prediction of forthcoming phenoconversion diagnosis. This finding may be used in designing future disease-modifying trials. ANN NEUROL 2024;95:1178-1192.

• MeSH
• demence s Lewyho tělísky * diagnostické zobrazování   MeSH
• dopamin * metabolismus   MeSH
• jednofotonová emisní výpočetní tomografie MeSH
• lidé středního věku MeSH
• lidé MeSH
• Parkinsonova nemoc * diagnostické zobrazování   komplikace   MeSH
• porucha chování v REM spánku * diagnostické zobrazování   MeSH
• presynaptické terminály metabolismus   MeSH
• senioři MeSH
• strojové učení * MeSH
• synukleinopatie * diagnostické zobrazování   MeSH
• zobrazení dopaminergního systému 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

• MeSH
• kongresy jako téma MeSH
• nukleární lékařství * MeSH
• Publikační typ
• zprávy MeSH

Oxidative stress supposedly plays a role in the pathogenesis of Parkinson's disease (PD). Uric acid (UA), a powerful antioxidant, is lowered in PD while allantoin, the oxidation product of UA and known biomarker of oxidative stress, was not systematically studied in PD. We aim to compare serum and cerebrospinal fluid (CSF) levels of UA, allantoin, and allantoin/UA ratio in de novo PD patients and controls, and evaluate their associations with clinical severity and the degree of substantia nigra degeneration in PD. We measured serum and CSF levels of UA, allantoin, and allantoin/UA ratio in 86 PD patients (33 females, mean age 57.9 (SD 12.6) years; CSF levels were assessed in 51 patients) and in 40 controls (19 females, 56.7 (14.1) years). PD patients were examined using Movement Disorder Society-Unified Parkinson's Disease Rating Scale (MDS-UPDRS), Montreal Cognitive Assessment (MoCA), Scales for Outcomes in Parkinson Disease-Autonomic (SCOPA-AUT), the University of Pennsylvania Smell Identification Test (UPSIT), one-night video-polysomnography, and dopamine transporter single-photon emission computed tomography (DAT-SPECT). Serum allantoin and allantoin/UA ratio were significantly increased in the PD group compared to controls (p < 0.001 and p = 0.002, respectively). Allantoin/UA ratios in serum and CSF were positively associated with the SCOPA-AUT score (p = 0.005 and 0.031, respectively) and RBD presence (p = 0.044 and 0.028, respectively). In conclusion, serum allantoin and allantoin/UA ratio are elevated in patients with de novo PD. Allantoin/UA ratio in serum and CSF is associated with autonomic dysfunction and RBD presence, indicating that higher systemic oxidative stress occurs in PD patients with more diffuse neurodegenerative changes.

• Publikační typ
• časopisecké články MeSH

BACKGROUND: Renal changes may have long-term sequalae and prevention is a main goal of management of primary vesicoureteral reflux (VUR). AIM: This study aims to reveal how much 99mTc-DMSA scintigraphy findings are reflected in the adopted surgical or non-surgical treatment in children with diagnosed primary VUR and to give the clinicians information regarding their final therapeutic decision. PATIENTS AND METHODS: A total 207 children with primary VUR who underwent non-acute 99mTc-DMSA scan were retrospectively evaluated. The presence of renal changes, their grading, differential function asymmetry (<45%) and grade of VUR were compared with subsequent choice of therapy. RESULTS: Altogether 92 (44%) children had asymmetric differential function, 122 (59%) showed presence of renal changes, 79 (38%) had high-grade VUR (IV-V). Patients with renal changes had lower differential function (41%vs.48%) and higher grade of VUR. The incidence of high-grade changes (G3+G4B) afflicting more than one third of the kidney was significantly different between grade I-II, III and IV-V VUR (9%, 27%, 48%, respectively). Renal changes were detected in 76% of surgically and 48% of non-surgically treated patients, high-grade 99mTc-DMSA changes in 69% and 31%, respectively. In children with no scars/dysplasia (G0+G4A), non-surgical treatment prevailed in 77%. The independent predictors for surgical intervention were presence of renal changes and higher grade of VUR, but not functional asymmetry. DISCUSSION: Over the last 20 years, there has been a shift toward more non-surgical management of VUR. The long-term outcome of this approach should be thoroughly studied. This is the first study analysing renal status in VUR patients using 99mTc-DMSA scan and its grading regarding the adopted treatment. Renal changes in almost half of non-surgically treated children with VUR should be an indicator for earlier diagnosis and effective treatment of acute pyelonephritis and VUR. We recommend distinguishing grade III VUR, as a moderate-grade VUR, because it is linked to higher incidence of high-grade 99mTc-DMSA changes (G3+G4B); our findings of 65% of grade III VURs treated non-surgically should be cautionary. Grade III VUR does not mean a low-risk condition and should alert the clinician to evaluate the extent of renal changes and unmask high-risk cases. CONCLUSIONS: Our data strengthens the need to investigate the extent of renal changes in VUR patients regarding treatment decision. Performing 99mTc-DMSA scan individualizes the treatment of VUR patients; its grading can distinguish grade III-VUR as a separate risk entity because it differs significantly in terms of incidence of high-grade renal changes and chosen therapy.

• MeSH
• dítě MeSH
• infekce močového ústrojí * diagnostické zobrazování   MeSH
• kojenec MeSH
• ledviny diagnostické zobrazování   MeSH
• lidé MeSH
• radiofarmaka MeSH
• radioisotopová scintigrafie MeSH
• retrospektivní studie MeSH
• technecium 99mTc dimerkaptojantarová kyselina MeSH
• vezikoureterální reflux * diagnostické zobrazování   terapie   MeSH
• Check Tag
• dítě MeSH
• kojenec MeSH
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

• Publikační typ
• abstrakt z konference MeSH

BACKGROUND: Sialic acid-protein interactions are involved in regulating central nervous system immunity; therefore, derangements in sialylation could be involved in neurodegeneration. OBJECTIVES: We evaluate the differences in serum transferrin sialylation in prodromal and early-stage Parkinson's disease (PD), its relation to substantia nigra degeneration, and the risk of phenoconversion to manifest disease. METHODS: Sixty treatment-naive PD patients; 72 polysomnography-confirmed isolated rapid eye movement sleep behavior disorder (iRBD) patients, that is, patients with prodromal synucleinopathy; and 46 healthy volunteers aged ≥45 years and drinking ≤60 standard drinks per month were included. The proportion of serum low-sialylated, carbohydrate-deficient transferrin (CDT) isoforms was assessed using high-performance liquid chromatography, and the values were adjusted for alcohol intake (CDTadj ). Dopamine transporter single-photon emission computed tomography (DaT-SPECT) imaging was performed. In iRBD, phenoconversion risk of DaT-SPECT and CDTadj was evaluated using Cox regression adjusted for age and sex. RESULTS: Median CDTadj was lower in PD (1.1 [interquartile range: 1.0-1.3]%) compared to controls (1.2 [1.1-1.6]%) (P = 0.001). In iRBD, median CDTadj was lower in subjects with abnormal (1.1 [0.9-1.3]%) than normal (1.3 [1.2-1.6]%) DaT-SPECT (P = 0.005). After a median 44-month follow-up, 20% of iRBD patients progressed to a manifest disease. Although iRBD converters and nonconverters did not significantly differ in CDTadj levels (P = 0.189), low CDTadj increased the risk of phenoconversion with hazard ratio 3.2 (P = 0.045) but did not refine the phenoconversion risk associated with abnormal DaT-SPECT yielding hazard ratio 15.8 (P < 0.001). CONCLUSIONS: Decreased serum CDTadj is associated with substantia nigra degeneration in synucleinopathies. iRBD patients with low CDTadj are more likely to phenoconvert to manifest disease. © 2022 The Authors. Movement Disorders published by Wiley Periodicals LLC on behalf of International Parkinson Movement Disorder Society.

• MeSH
• jednofotonová emisní výpočetní tomografie metody   MeSH
• lidé MeSH
• Parkinsonova nemoc * komplikace   diagnostické zobrazování   MeSH
• porucha chování v REM spánku * komplikace   diagnostické zobrazování   MeSH
• synukleinopatie * MeSH
• transferin MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH

CONTEXT: Investigate whether 123I-ioflupane SPECT (DaT SPECT) has the potential as a marker of basal ganglia damage in acute methanol poisoning. METHODS: Prospective, single-centre, cohort study of patients with confirmed methanol poisoning was conducted. DaT SPECT was performed twice with semi-quantification using DaTQUANTTM and MRI-based volumetry was calculated. Specific binding ratios (SBR) of striatum, caudate nucleus, and putamen were correlated with laboratory parameters of outcome, volumetric data, and retinal nerve fibres layer (RNFL) thickness measurements. RESULTS: Forty-two patients (mean age 46.3 ± 4.2 years; 8 females), including 15 with MRI-detected putamen lesions (group I) and 27 patients with intact putamen (group II), underwent DaT SPECT. Volumetry was calculated in 35 of the patients assessed. SBR values for the left putamen correlated with putamen volume (r = 0.665; p < 0.001). Decreased bilateral SBR values were determined for the striatum and the putamen, but not for the nucleus caudate, in group I (p < 0.05). Significant correlation was observed between the SBR of the posterior putamen and arterial blood pH (r = 0.574; p < 0.001) and other toxicological parameters of severity of poisoning/outcome including serum lactate, glucose, and creatinine concentrations (p < 0.05). The SBR of the posterior putamen positively correlated with the global RNFL thickness (p < 0.05). ROC analysis demonstrated a significant discriminatory ability of SBR of the posterior putamen with AUC = 0.753 (95%CI 0.604-0.902; p = 0.007). The multivariate regression model demonstrated that arterial blood pH, age, and gender were the most significant factors associated with SBR of the posterior putamen. CONCLUSION: DaT SPECT demonstrates significant potential for the diagnosis of methanol-induced basal ganglia damage.

• MeSH
• bazální ganglia diagnostické zobrazování   účinky léků   MeSH
• dospělí MeSH
• jednofotonová emisní výpočetní tomografie metody   MeSH
• lidé středního věku MeSH
• lidé MeSH
• longitudinální studie MeSH
• magnetická rezonanční tomografie MeSH
• methanol otrava   MeSH
• nemoci bazálních ganglií chemicky indukované   diagnostické zobrazování   MeSH
• neurozobrazování MeSH
• nortropany MeSH
• prospektivní studie MeSH
• putamen diagnostické zobrazování   účinky léků   MeSH
• radiofarmaka MeSH
• radioizotopy jodu MeSH
• Check Tag
• dospělí MeSH
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• pozorovací studie MeSH

INTRODUCTION: Rapid eye movement (REM) sleep behavior disorder (RBD) is associated with an increased risk of developing Parkinson's disease (PD). Low uric acid (UA) levels are associated with the risk of development and progression of PD. Allantoin is the major oxidation product of UA and is considered as a biomarker of oxidative stress. We aimed to compare serum levels of UA, allantoin, and allantoin/UA ratio in RBD patients with those in healthy controls, and to examine their associations with clinical severity. METHODS: We evaluated serum levels of UA, allantoin, and allantoin/UA ratio in 38 RBD patients (one female, mean age 66.8 (SD 6.3) years) and in 47 controls (four females, 66.8 (7.6) years). All RBD patients were assessed according to an examination protocol, which included structured interview, Montreal Cognitive Assessment (MoCA), Movement Disorder Society-Unified Parkinson's Disease Rating Scale (MDS-UPDRS), and dopamine transporter single-photon emission computed tomography (DAT-SPECT). The lower putaminal binding ratio from both hemispheres was used for analysis. RESULTS: Mean serum allantoin concentration and allantoin/UA ratio were significantly increased in the RBD group compared to controls (2.6 (1.8) vs. 1.4 (0.7) μmol/l, p = 0.0004, and 0.008 (0.004) vs. 0.004 (0.002), p < 0.0001, respectively). There were no significant differences in UA levels between the two groups. No significant associations between any biochemical parameter and RBD duration, putaminal binding ratio on DAT-SPECT, MDS-UPDRS, or MoCA score were found. CONCLUSION: Serum allantoin and allantoin/UA ratio are increased in RBD patients in comparison to controls, which may reflect increased systemic oxidative stress in prodromal synucleinopathy.

• MeSH
• alantoin krev   MeSH
• biologické markery krev   MeSH
• jednofotonová emisní výpočetní tomografie MeSH
• kyselina močová krev   MeSH
• lidé MeSH
• oxidační stres MeSH
• porucha chování v REM spánku krev   MeSH
• senioři MeSH
• studie případů a kontrol MeSH
• synukleinopatie krev   MeSH
• Check Tag
• lidé MeSH
• mužské pohlaví MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• hodnotící studie MeSH
• práce podpořená grantem MeSH