• MeSH
• bakteriální endokarditida * MeSH
• endokarditida * diagnostické zobrazování   MeSH
• fluorodeoxyglukosa F18 MeSH
• infekce spojené s protézou * diagnostické zobrazování   MeSH
• lidé MeSH
• PET/CT MeSH
• pozitronová emisní tomografie MeSH
• radiofarmaka MeSH
• srdeční chlopně umělé * MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• komentáře MeSH
• úvodníky MeSH
• Názvy látek
• fluorodeoxyglukosa F18 MeSH
• radiofarmaka MeSH

BACKGROUND: Cadmium-Zinc-Telluride (CZT) technology allows use of low activities of radiopharmaceuticals. The aim was to verify the values of left ventricular volume parameters, obtained via ultra-low-dose thallium Single Photon Emission Computed Tomography (SPECT) using a CZT camera. METHODS AND RESULTS: Forty-five patients referred for an assessment of myocardial perfusion or viability imaging were examined using CZT-SPECT and 1.5 T magnetic resonance (MRI) scanner. The ultra-low-dose protocol with 0.5 Mbq 201-Tl per kg of body weight was used. The values of end-systolic (ESV) and end-diastolic volumes (EDV), left ventricular ejection fraction (EF) and myocardial mass (MM) were assessed using both techniques. A very good correlation was found between the EF, ESV, and EDV values assessed with CZT-SPECT and cardiac magnetic resonance MRI; the Pearson coefficients were 0.86, 0.95, and 0.91, respectively. A moderate correlation was found for myocardial mass, r = 0.57. Compared to MRI, SPECT systematically overestimated ESV and MM, while it underestimates the EF, with P ≤ .001 in all cases. There was no difference in EDV estimation. CONCLUSIONS: Left ventricular volumes and ejection fraction assessed via ultra-low-dose CZT-SPECT showed very good correlation with the values obtained by MRI. A moderate correlation was found for myocardial mass.

• Klíčová slova
• CZT, Left ventricular ejection fraction, Myocardial mass, Volumes, thallium,
• MeSH
• funkce levé komory srdeční * MeSH
• jednofotonová emisní výpočetní tomografie * metody   MeSH
• kadmium MeSH
• lidé MeSH
• magnetická rezonanční tomografie metody   MeSH
• radioizotopy thallia MeSH
• telur MeSH
• tepový objem MeSH
• zinek MeSH
• Check Tag
• lidé MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Názvy látek
• CdZnTe MeSH Prohlížeč
• kadmium MeSH
• radioizotopy thallia MeSH
• telur MeSH
• Thallium-201 MeSH Prohlížeč
• zinek MeSH

OBJECTIVE: To test the hypothesis that, in the initial evaluation of patients with suspected coronary artery disease (CAD), stress myocardial perfusion imaging (MPI) would result in less downstream testing than coronary computed tomographic angiography (CCTA). METHODS: In this international, randomized trial, mildly symptomatic patients with an intermediate likelihood of having CAD, and asymptomatic patients at intermediate risk of cardiac events, underwent either initial stress-rest MPI or CCTA. The primary outcome was downstream noninvasive or invasive testing at 6 months. Secondary outcomes included cumulative effective radiation dose (ERD) and costs at 12 months. RESULTS: We recruited 303 patients (151 MPI and 152 CTA) from 6 centers in 6 countries. The initial MPI was abnormal in 29% (41/143) and CCTA in 56% (79/141) of patients. Fewer patients undergoing initial stress-rest MPI had further downstream testing at 6 months (adjusted OR 0.51, 95% CI 0.28-0.91, P = 0.023). There was a small increase in the median cumulative ERD with MPI (9.6 vs. 8.8 mSv, P = 0.04), but no difference in costs between the two strategies at 12 months. CONCLUSION: In the management of patients with suspected CAD, a strategy of initial stress MPI is substantially less likely to require further downstream testing than initial testing with CCTA. TRIAL REGISTRATION: clinicaltrials.gov identification number NCT01368770.

• Klíčová slova
• Myocardial perfusion imaging—SPECT, computed tomography, coronary artery disease,
• MeSH
• časná diagnóza MeSH
• CT angiografie metody   MeSH
• funkční vyšetření srdce metody   MeSH
• internacionalita MeSH
• koronární angiografie metody   MeSH
• lidé středního věku MeSH
• lidé MeSH
• nemoci koronárních tepen diagnostické zobrazování   patologie   MeSH
• odchylka pozorovatele MeSH
• plošný screening metody   MeSH
• reprodukovatelnost výsledků MeSH
• senzitivita a specificita MeSH
• zobrazování myokardiální perfuze metody   MeSH
• Check Tag
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• multicentrická studie MeSH
• práce podpořená grantem MeSH
• randomizované kontrolované studie MeSH
• srovnávací studie MeSH

BACKGROUND: Treadmill exercise nitrogen-13 ((13)N)-ammonia positron emission tomography (PET) has logistical challenges and limited literature. We aimed to assess its feasibility, image quality, and diagnostic accuracy in obese and nonobese patients. METHODS AND RESULTS: Between 2009 and 2012, 10,804 patients were referred for myocardial perfusion imaging, including 300 for treadmill PET, of whom 265 were included in this study. Treadmill testing and PET were performed using standard procedures. Image quality, perfusion, and summed stress score (SSS) were assessed. Invasive coronary angiography was performed within 90 days of PET in 43 patients. Mean ± SD body mass index (BMI) was 35.7 ± 7.7 kg/m(2) (range 19.5-63.5 kg/m(2)). Feasibility of treadmill (13)N-ammonia PET was 100%. Exercise duration was less for obese patients than nonobese patients (P < .001). Image quality was rated good for 96.9% of obese and 100% of nonobese patients. For all patients, sensitivity was 86.4% and specificity was 74.4%. Diagnostic accuracy did not change significantly with increasing BMI. SSS remained significant in predicting angiographic coronary artery disease after adjustment for age, sex, and Duke treadmill score. CONCLUSIONS: Treadmill (13)N-ammonia PET is highly feasible, yields good image quality, and has moderately high diagnostic accuracy in a small subset of obese and nonobese patients who are deemed able to perform treadmill exercise.

• Klíčová slova
• Coronary artery disease, exercise stress testing, myocardial perfusion imaging, obesity, positron emission tomography,
• MeSH
• amoniak MeSH
• lidé středního věku MeSH
• lidé MeSH
• nemoci koronárních tepen komplikace   diagnostické zobrazování   MeSH
• obezita komplikace   diagnostické zobrazování   MeSH
• pozitronová emisní tomografie metody   MeSH
• radiofarmaka MeSH
• radioizotopy dusíku * MeSH
• reprodukovatelnost výsledků MeSH
• senioři MeSH
• senzitivita a specificita MeSH
• studie proveditelnosti MeSH
• zátěžový test MeSH
• zobrazování myokardiální perfuze metody   MeSH
• Check Tag
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• senioři MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• Research Support, N.I.H., Extramural MeSH
• Názvy látek
• amoniak MeSH
• radiofarmaka MeSH
• radioizotopy dusíku * MeSH

BACKGROUND: The impact of different levels of tracer uptake on improvements of left-ventricular (LV) function was analyzed in patients treated by intracoronary bone marrow cell (BMC) transplantation. METHODS AND RESULTS: Thirty-one patients with irreversible damage after their first acute myocardial infarction (MI), as confirmed by sestamibi single-photon emission computed tomography (MIBI SPECT)/fluorodeoxyglucose positron emission tomography (FDG PET), underwent high-dose (1 x 10(8) cells) BMC transplantation, whereas 31 similar patients were randomly integrated into a control group. In 11 BMC-treated patients with very low sestamibi uptake at less than 30% of maximum in the infarcted area, the mean left-ventricular ejection fraction (LVEF) improved after 3 months of follow-up by 3% only, and mean end-diastolic/end-systolic volumes (EDV/ESV) enlarged by 10/1 mL (P = NS vs controls). In 20 BMC-treated patients with higher sestamibi uptake in the range of 31% to 50% of maximum, LVEF improved by 7%, and EDV/ESV decreased by 5/12 mL (P < .05 vs BMC-treated subgroup with low MIBI uptake and controls). No similar categorization was seen in the control group: in patients with higher sestamibi uptake or very low uptake, the LVEF increased by 2% and 3% only, and the EDV/ESV enlarged in both subgroups by 12/4 mL and 12/2 mL, respectively (P = NS). CONCLUSIONS: Our results suggest the capability of SPECT/PET imaging to select patients who will receive the maximum benefit from BMC therapy.

• MeSH
• dysfunkce levé srdeční komory diagnostické zobrazování   prevence a kontrola   MeSH
• fluorodeoxyglukosa F18 * MeSH
• hodnocení výsledků zdravotní péče metody   MeSH
• infarkt myokardu diagnostické zobrazování   chirurgie   MeSH
• jednofotonová emisní výpočetní tomografie metody   MeSH
• koronární cévy diagnostické zobrazování   MeSH
• lidé středního věku MeSH
• lidé MeSH
• pozitronová emisní tomografie metody   MeSH
• radiofarmaka MeSH
• transplantace kostní dřeně diagnostické zobrazování   metody   MeSH
• výsledek terapie MeSH
• Check Tag
• lidé středního věku MeSH
• lidé MeSH
• mužské pohlaví MeSH
• ženské pohlaví MeSH
• Publikační typ
• časopisecké články MeSH
• práce podpořená grantem MeSH
• randomizované kontrolované studie MeSH
• Názvy látek
• fluorodeoxyglukosa F18 * MeSH
• radiofarmaka MeSH