Quantum metropolitan optical network based on wavelength division multiplexing.

Quantum Key Distribution (QKD) is maturing quickly. However, the current approaches to its application in optical networks make it an expensive technology. QKD networks deployed to date are designed as a collection of point-to-point, dedicated QKD links where non-neighboring nodes communicate using the trusted repeater paradigm. We propose a novel optical network model in which QKD systems share the communication infrastructure by wavelength multiplexing their quantum and classical signals. The routing is done using optical components within a metropolitan area which allows for a dynamically any-to-any communication scheme. Moreover, it resembles a commercial telecom network, takes advantage of existing infrastructure and utilizes commercial components, allowing for an easy, cost-effective and reliable deployment.

Effect of surface sensory and motor electrical stimulation on chronic poststroke oropharyngeal dysfunction.

BACKGROUND: Chronic poststroke oropharyngeal dysfunction (OD) is a common condition, leading to severe complications, including death. Treatments for chronic poststroke OD are scarce. The aim of our study was to assess and compare the efficacy and safety of treatment with surface electrical stimulation (e-stim) at sensory and motor intensities in patients with chronic poststroke OD. METHODS: Twenty chronic poststroke patients with OD were randomly assigned to (i) sensory e-stim (treatment intensity: 75% of motor threshold) or (ii) motor e-stim (treatment intensity: motor threshold). Patients were treated during 10 days, 1 h/day. Videofluoroscopy was performed at the beginning and end of the study to assess signs of impaired efficacy and safety of swallow and timing of swallow response. KEY RESULTS: Patients presented advanced age (74.95 ± 2.18), 75% were men. The mean days poststroke was 336.26 ± 89.6. After sensory stimulation, the number of unsafe swallows was reduced by 66.7% (p < 0.001), the laryngeal vestibule closure time by 22.94% (p = 0.027) and maximal vertical hyoid extension time by 18.6% (p = 0.036). After motor stimulation, the number of unsafe swallows was reduced by 62.5% (p = 0.002), the laryngeal vestibule closure time by 38.26% (p = 0.009) and maximal vertical hyoid extension time by 24.8% (p = 0.008). Moreover, the motor stimulus reduced the pharyngeal residue by 66.7% (p = 0.002), the upper esophageal sphincter opening time by 39.39% (p = 0.009), and increased bolus propulsion force by 211.1% (p = 0.008). No serious adverse events were detected during the treatment. CONCLUSIONS & INFERENCES: Surface e-stim is a safe and effective treatment for chronic poststroke dysphagic patients.

Emergency perception and other variables associated with extra-hospital delay in stroke patients in the Maresme region (Spain).

Delay in arrival to the emergency room (ER) may negatively influence outcome of stroke patients. We aim to analyze factors that influence extra-hospital delay in stroke patients. Two hundred and ninety-two consecutive stroke patients admitted in the ER were prospectively studied. Analysis was made to identify variables associated with <1- and <3 h delays from onset. About 18.8% of patients arrived before 1 h and 57.5% before 3 h. Factors independently associated with <3 h delay were decision to go immediately to ER (OR = 8.17; 95% IC = 4.47-18.8), ambulance transportation (OR = 2.35; 1.36-4.05) and total anterior circulation syndrome (TACS) (OR = 3.74; 1.51-9.24). History of >1 vascular risk factor was associated with a greater delay (OR = 0.47; 0.26-0.86). Factors associated with a <1 h delay were: (i) immediate decision to attend the ER (OR = 3.55; 1.85-6.81), (ii) stroke on Sunday (OR = 3.46; 1.56-7.66), (iii) aphasia (OR = 2.41; 1.23-4.74), (iv) absence of stairs at home (OR = 0.37; 0.17-0.81) and (v) absence of diabetes mellitus (OR = 0.42; 0.20-0.88). In our area, nearly 60% of stroke patients arrive to ER before 3 h from onset. Immediate decision to attend the ER has the strongest association with a short delay. Patients with TACS arrived mainly before 3 h and those with isolated aphasia arrived before 1 h. Patients with vascular risk factors attended the hospital later. Ambulance transportation is associated with <3 h delay, but not with <1 h.

[HIV-associated myelopathy: an uncommon indicator of AIDS]. / La myélopathie associée au VIH: un mode rare de révélation du sida.

INTRODUCTION: Spinal cord lesions are an uncommon mode of discovering acquired immunodeficiency syndrome because they usually appear at a later stage. EXEGESIS: We report a 58-year-old patient who had a spastic paraparesia and sphincter dysfunction. The spinal cord magnetic resonance imaging showed spontaneous hypersignals on T2-weighted images at the cervical and thoracic levels, enhanced with gadolinium, and without swelling. No cause was found. The HIV serology was positive and allowed us to consider an HIV-associated myelopathy. The antiretroviral therapy led to functional recovery. CONCLUSION: An HIV serology is suggested whenever an unexplained intramedullary lesion is discovered. Indeed, the diagnosis of HIV-associated myelopathy implies a specific therapeutic approach.

[Needle-tract seeding after ultrasound-guided puncture of hepatocellular carcinoma. A study of 150 patients]. / Essaimages tumoraux sur le trajet de ponctions écho-guidées de carcinomes hépatocellulaires. Etude de 150 malades.

OBJECTIVES: To study the frequency of tumor seeding after percutaneous biopsy of hepatocellular carcinoma and to evaluate the impact on long-term survival. METHODS: Records of 150 patients with cirrhosis who underwent ultrasound-guided aspiration biopsy for hepatocellular carcinoma between 1989 and 1996 were reviewed in June 1998. Liver transplantation was performed in 7 patients. One to three needle passes were performed with 18 to 20 gauge needles. Follow-up included regular clinical examinations and ultrasonography or computerized tomography. RESULTS: Four cases (2.66%) of subcutaneous metastasis were noted at the needle insertion site; none in transplanted patients. All patients had viral cirrhosis, Okuda class I. Nodules were detected 4, 12, 22 and 24 months after biopsy. The second patient is alive 24 months after tumor seeding. For other patients, survival time was 4, 24 and 60 months respectively, without local tumor extension after surgical resection or radiotherapy. During a mean 11.8 months of follow-up, 127 patients died without tumor seeding. Eleven patients are still being followed and have no signs of needle tract implantation of hepatocellular carcinoma (mean follow-up 34.7 months). CONCLUSION: The prevalence of tumoral seeding after percutaneous biopsy of hepatocellular carcinoma was 2.66%, which is higher than in previous studies. After liver transplantation, no evidence of needle tract seeding was identified. Survival did not seem to be influenced by local evolution.

[Pheochromocytoma manifesting as toe necrosis]. / Phéochromocytome révélé par une nécrose digitale.

BACKGROUND: Cutaneous manifestations of pheochromocytoma other than sweating, and facial pallor during paroxysmal episodes of hypertension are exceptional. CASE REPORT: We observed partial necrosis of the fourth toes which revealed pheochromocytoma. DISCUSSIONS: Signs of peripheral vascular disease are uncommon during the course of pheochromocytoma. Only four cases have been reported in the literature. Occurrence of distal necrosis in combination with hypertension and palpable pulses is suggestive of pheochromocytoma requiring assay of urinary catecholamines. The pathogenic mechanisms of necrosis would be vasospasm of cutaneous vessels due to excessive plasmatic catecholamine levels and thrombocytosis as an aggravating factor.

A phase II study of 5-fluorouracil, leucovorin and cisplatin (FLP) for metastatic gastric cancer.

The modulation of 5-fluorouracil (5-FU) with folinic acid (leucovorin, LV) is more efficacious than 5-FU alone in the treatment of metastatic colorectal cancer, and the combination of 5-FU with cisplatin is currently one of the most active regimens in advanced gastric cancer. A phase II study was therefore conducted to test the efficacy and toxicity of the combination of 5-FU, LV and cisplatin (FLP) in metastatic gastric cancer. 28 patients entered the study. Metastatic sites were observed in the liver (in 21 patients), the peritoneum (in 8), the lymph nodes (in 7) or the bones (in 1) and a local recurrence was noted in 4 cases. The performance status (using World Health Organisation criteria) was 0 for 13 patients and 1 or 2 for the others. Cycles of treatment were administered every 28 days and consisted of LV 200 mg/m2/day for 5 days followed by 5-FU 400 mg/m2/day for 5 days with cisplatin 100 mg/m2 on day 2. The response rate for the 27 evaluable patients was 51.8% (95% confidence interval (CI), 33-70.6%). There were four complete responses (14.8%) and 10 partial responses (37%). Median survival was 11 months and 4 patients were alive at 2 years. Both response rate and survival were better for patients with a good performance status. The overall toxicity was very low, except for 1 patient who died of dehydration and cardiac failure. In conclusion, the FLP protocol was effective and well tolerated in patients with metastatic gastric cancer.

[Syndrome of hemophagocytosis associated with infections]. / Syndrome d'hémophagocytose associé aux infections.

Infection-related hemophagocytic syndrome was originally described in viral processes by Risdall in 1979. Recent reports have suggested associations of this syndrome with bacterial, parasitic and fungal infections. It occurs generally in immunosuppressed patients. The clinical and biological manifestations are not specific. The diagnosis is based on morphologic examination of the bone marrow showing a benign proliferation of histiocytes with hemophagocytosis. Treatment is symptomatic, however when an infectious etiology is found a specific treatment must be applied. This pathology has a poor prognosis, with a fifty percent mortality rate. When evolution is favorable, relapses are exceptional. The precise pathophysiological mechanism has not yet been determined. A better understanding of the cytokines' role should permit to consider new therapeutic routes.

Spontaneous resolution of acquired factor X deficiency in amyloidosis.

We describe the case of a 51-year-old man with systemic amyloidosis in whom factor X activity was initially 6% of the normal. Amyloidosis was responsible for congestive heart failure and a nephrotic syndrome but there was no bleeding diathesis. A 12-month trial of melphalan and prednisone failed to improve cardiac and renal dysfunction; factor X levels remained low. Eighteen months after this treatment was stopped, factor X spontaneously normalized although renal insufficiency persisted. We suggest that the possibility of a spontaneous factor X recovery must be considered when evaluating efficacy of therapeutic agents in amyloidosis.