Ground-to-satellite quantum teleportation.

An arbitrary unknown quantum state cannot be measured precisely or replicated perfectly. However, quantum teleportation enables unknown quantum states to be transferred reliably from one object to another over long distances, without physical travelling of the object itself. Long-distance teleportation is a fundamental element of protocols such as large-scale quantum networks and distributed quantum computation. But the distances over which transmission was achieved in previous teleportation experiments, which used optical fibres and terrestrial free-space channels, were limited to about 100 kilometres, owing to the photon loss of these channels. To realize a global-scale 'quantum internet' the range of quantum teleportation needs to be greatly extended. A promising way of doing so involves using satellite platforms and space-based links, which can connect two remote points on Earth with greatly reduced channel loss because most of the propagation path of the photons is in empty space. Here we report quantum teleportation of independent single-photon qubits from a ground observatory to a low-Earth-orbit satellite, through an uplink channel, over distances of up to 1,400 kilometres. To optimize the efficiency of the link and to counter the atmospheric turbulence in the uplink, we use a compact ultra-bright source of entangled photons, a narrow beam divergence and high-bandwidth and high-accuracy acquiring, pointing and tracking. We demonstrate successful quantum teleportation of six input states in mutually unbiased bases with an average fidelity of 0.80 ± 0.01, well above the optimal state-estimation fidelity on a single copy of a qubit (the classical limit). Our demonstration of a ground-to-satellite uplink for reliable and ultra-long-distance quantum teleportation is an essential step towards a global-scale quantum internet.

Risk factors for post-endoscopic retrograde cholangiopancreatography (ERCP) abdominal pain in patients without post-ERCP pancreatitis.

BACKGROUND: Abdominal pain is often observed after endoscopic retrograde cholangiopancreatography (ERCP). Few studies have focused on the risk factors of post-ERCP abdominal pain without post-ERCP pancreatitis (PEP). This study aimed to identify risk factors of post-ERCP abdominal pain without PEP and investigate characteristics of the abdominal pain in non-PEP patients. METHODS: Data from patients who underwent ERCP from August 2019 to January 2020 were retrospectively collected. Characteristics of the abdominal pain after ERCP were recorded and compared between PEP and non-PEP patients. Multivariate analysis was conducted to identify risk factors of non-PEP abdominal pain. RESULTS: A total of 1295 ERCP procedures were investigated in this study, among which 100 (7.72%) patients presented post-ERCP abdominal pain without PEP and 63 (4.86%) patients with PEP. Multivariate analysis found 9 risk factors of non-PEP abdominal pain: age ≤ 65 years [odds ratio (OR): 1.971], primary ERCP (OR: 2.442), dilated extrahepatic bile duct (OR: 1.803), no papilla opening (OR: 2.095), pancreatic guidewire passages (OR: 2.258), white blood cells (WBC) ≤ 6.0 × 109/L (OR: 1.689), platelet (PLT) ≤ 250 × 109/L (OR: 2.505), serum γ-glutamyl transferase (γ - GT) ≤ 35 U/L (OR: 2.190), and albumin ≥ 40 g/L (OR: 1.762). The PEP group had later pain onset, higher pain frequency and longer hospital stay than those of the non-PEP pain group (P < 0.05). There were no significant differences in the pain duration, visual analogue scale score and mortality between the PEP group and non-PEP pain group (P > 0.05). CONCLUSIONS: This study indicated that age ≤ 65 years, primary ERCP, dilated extrahepatic bile duct, no papilla opening, pancreatic guidewire passages, lower WBC, lower PLT, normal γ - GT and elevated albumin were independent risk factors for post-ERCP abdominal pain without PEP. The pain occurred earlier in non-PEP patients than in PEP patients.

Using air cholangiography to reduce postendoscopic retrograde cholangiopancreatography cholangitis in patients with malignant hilar obstruction.

Background: Cholangitis after endoscopic retrograde cholangiopancreatography (ERCP) is a major problem for patients with hilar biliary obstruction. To date, it remains unclear whether air-contrast cholangiography (ACC) can reduce cholangitis in these patients. For this reason, our study assesses the efficacy of reducing cholangitis through ACC. Methods: This paper presents a retrospective study conducted at a tertiary university hospital. We enrolled patients who were diagnosed with hilar structures and underwent ERCP between January 2012 and December 2018. From 2015 onwards, ACC was performed following the successful selective cannulation into the dilated intrahepatic bile duct of these patients. The primary aim was to assess patients with cholangitis in both an ACC group and iodine contrast cholangiography (ICC) group. Results: This study included 80 patients, 35 of whom received ACC and 45 who received ICC. There were no differences between the 2 groups in terms of the number of patients who underwent endoscopic papillotomy, endoscopic nasobiliary drainage, endoscopic biliary stent placement, or other technical procedures or complications. A total of 19 patients (23.8%) presented with fever (cholangitis) after the ERCP procedure (4 ACC, 15 ICC; 11.4% vs. 33.3%, respectively; P=0.03). One patient in the ICC group who obtained a plastic stent for palliative drainage died 2 weeks post-ERCP. Among the other 18 cholangitis patients, 8 (1 ACC, 7 ICC) were treated with additional ERCP or percutaneous transhepatic biliary drainage (PTBD), while the remaining 10 only received antibiotics. One patient in the ICC group who obtained a plastic stent for palliative drainage died 2 weeks post-ERCP. Conclusions: We found that ACC significantly reduced the incidence of cholangitis in patients with hilar obstruction.

Deep cholestatic jaundice as the predominant manifestation in autoimmune hepatitis.

Autoimmune hepatitis is a chronic liver disease of unknown etiology. The diagnosis is based on the exclusion of other liver diseases such as drug-induced liver disease, alcohol liver disease, viral liver diseases and so on, characterizing by elevation of transaminases, hypergammaglobulinemia, auto antibodies and the histological features of interface hepatitis and plasma cells infiltration. However, deep cholestatic jaundice as the initial presentation, with elevated serum transaminases one month later, is rare in autoimmune hepatitis. We described a case of type 1 autoimmune hepatitis with deep cholestatic jaundice and hyperbilirubinemia as the initial predominant manifestation. It demonstrated that the cholestasis can also occur as the initial predominant syndrome in autoimmune hepatitis and respond well to the treatment with the glycyrrhizin and ursodeoxycholic acid.

Factors affecting occurrence of gastric varioliform lesions: A case-control study.

AIM: To investigate the factors influencing the occurrence of gastric varioliform lesions (GVLs) and their possible link with gastric cancer. METHODS: A 1:1 matched case-control study was performed to retrospectively analyze data from 1638 chronic gastritis patients who had undergone gastroscopy at one of two Chinese hospitals between 2009 and 2014. Patients with GVLs (cases) were compared to those without such lesions (controls). Endoscopic and pathological findings were recorded, along with interview information on Helicobacter pylori (H. pylori) infection, medical, drug and family histories, lifestyle and eating habits. The association between each factor and the occurrence of GVLs was estimated, and then multivariate conditional logistic regression was used to evaluate the independent factors. RESULTS: The frequency and severity of glandular atrophy, intestinal metaplasia (IM) and low-grade intraepithelial neoplasia were significantly increased in the GVL group (P < 0.01). Overall analysis showed that H. pylori infection [3.051 (2.157, 4.317), P <0.001], allergic respiratory diseases [3.636 (2.183, 6.055), P < 0.001], work-related stress [2.019 (1.568, 2.600), P < 0.001], irregular meals [2.300 (1.462, 3.619), P < 0.001], high intake of spicy food [1.754 (1.227, 2.507), P = 0.002] and high intake of fresh fruit [0.231 (0.101, 0.529), P = 0.001] were significantly correlated with the occurrence of GVLs (positively, except for the latter). Stratified analyses indicated that pickled food consumption in patients over 50 years old [7.224 (2.360, 22.115), P = 0.001] and excessive smoking in men [2.013 (1.282, 3.163), P = 0.002] were also positively correlated, and that, for antral GVLs, vegetable consumption [0.491 (0.311, 0.776), P = 0.002] was negatively correlated. CONCLUSION: Seven risk factors and two protective factors are determined for GVLs, which were found to be associated with premalignant abnormalities.

Clinical and immunopathological features of patients with lupus hepatitis.

BACKGROUND: Lupus hepatitis is yet to be characterized based on its clinical features and is often difficult to differentially diagnose from other liver diseases. We aimed to elucidate clinical, histopathological and immunopathological features of lupus hepatitis and to evaluate primarily the effectiveness of liver immunopathological manifestations on differential diagnosis of lupus hepatitis from other liver diseases. METHODS: A retrospective study was performed to analyze clinical features of lupus hepatitis in 47 patients out of 504 inpatients with systemic lupus erythematosus (SLE) in First Affiliated Hospital of Sun Yat-sen University, China from May 2006 to July 2009, and to evaluate the association between lupus hepatitis and SLE activity. Additionally, liver histopathological changes by hematoxylin and eosin (HE) staining and immunopathological changes by direct immunofluorescence test in 10 lupus hepatitis cases were analyzed and compared to those in 16 patients with other liver diseases in a prospective study. RESULTS: Of 504 SLE patients, 47 patients (9.3%) were diagnosed to have lupus hepatitis. The prevalence of lupus hepatitis in patients with active SLE was higher than that in those with inactive SLE (11.8% vs. 3.2%, P < 0.05). The incidence of hematological abnormalities in patients with lupus hepatitis was higher than that in those without lupus hepatitis (40.4% vs. 21.7%, P < 0.05), such as leucocytes count (2.92×10(9)/L vs. 5.48×10(9)/L), platelets count (151×10(9)/L vs. 190×10(9)/L), serum C3 and C4 (0.34 g/L vs. 0.53 g/L; 0.06 g/L vs. 0.09 g/L) (P < 0.05); 45 of 47 (95.7%) lupus hepatitis patients showed 1 upper limit of normal (ULN) < serum ALT level < 5 ULN. The liver histopathological features in patients with lupus hepatitis were miscellaneous and non-specific, similar to those in other liver diseases, but liver immunopathological features showed positive intense deposits of complement 1q in 7/10 patients with lupus hepatitis and negative complement 1q deposits in all patients with other liver diseases (Fisher's exact test, P = 0.011). CONCLUSIONS: Lupus hepatitis was not infrequent in active SLE patients which would be one of the indices indicating SLE activity. Positive intense deposit of complement 1q in liver may be a characteristic immunopathological feature of lupus hepatitis, which provides a new way to differentially diagnose lupus hepatitis from other liver diseases.