Publications by authors named "Roger Rodrigues"

12 Publications

  • Page 1 of 1

Detection of Rocio Virus SPH 34675 during Dengue Epidemics, Brazil, 2011-2013.

Emerg Infect Dis 2020 04;26(4):797-799

Recent seroprevalence studies in animals detected Rocio virus in regions of Brazil, indicating risk for re-emergence of this pathogen. We identified Rocio virus RNA in samples from 2 human patients for whom dengue fever was clinically suspected but ruled out by laboratory findings. Testing for infrequent flavivirus infections should expedite diagnoses.
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http://dx.doi.org/10.3201/2604.190487DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7101124PMC
April 2020

Multiple cavitary lung lesions on CT: imaging findings to differentiate between malignant and benign etiologies.

J Bras Pneumol 2020 20;46(2):e20190024. Epub 2019 Dec 20.

. Laboratório de Pesquisa em Imagens Médicas - LABIMED - Departamento de Radiologia, Pavilhão Pereira Filho, Irmandade Santa Casa de Misericórdia de Porto Alegre, Porto Alegre (RS) Brasil.

Objective: To determine the CT findings of multiple cavitary lung lesions that allow the differentiation between benign and malignant etiologies.

Methods: We reviewed CT scans, including patients with two or more cavitary lung lesions. We evaluated the number of cavitary lesions, their location, cavity wall thickness, and additional findings, correlating the variables with the diagnosis of a benign or malignant lesion.

Results: We reviewed the chest CT scans of 102 patients, 58 (56.9%) of whom were male. The average age was 50.5 ± 18.0 years. Benign and malignant lesions were diagnosed in 74 (72.6%) and 28 (27.4%) of the patients, respectively. On the CT scans, the mean number of cavities was 3, the mean wall thickness of the largest lesions was 6.0 mm, and the mean diameter of the largest lesions was 27.0 mm. The lesions were predominantly in the upper lobes, especially on the right (in 43.1%). In our comparison of the variables studied, a diagnosis of malignancy was not found to correlate significantly with the wall thickness of the largest cavity, lymph node enlargement, emphysema, consolidation, bronchiectasis, or bronchial obstruction. The presence of centrilobular nodules correlated significantly with the absence of malignant disease (p < 0.05). In contrast, a greater number of cavities correlated significantly with malignancy (p < 0.026).

Conclusions: A larger number of cavitary lung lesions and the absence of centrilobular nodules may be characteristic of a malignant etiology. However, on the basis of our evaluation of the lesions in our sample, we cannot state that wall thickness is a good indicator of a benign or malignant etiology.
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http://dx.doi.org/10.36416/1806-3756/e20190024DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7462708PMC
June 2020

[True Aneurysms of the Upper Limb: a Single-Centre Experience].

Rev Port Cir Cardiotorac Vasc 2019 Jul-Sep;26(3):209-212

Serviço de Angiologia e Cirurgia Vascular do Centro Hospitalar e Universitário de Coimbra, Coimbra, Portugal.

Introduction: True arterial aneurysms of the upper limb are rare and their treatment is intended to avoid complications as distal embolization, compression of surrounding neurovascular structures or rupture.

Objective: The purpose of this study is to review the experience of a department in the surgical treatment of true arterial aneurysms of the upper limb.

Methods: A retrospective study was performed between January 2007 and August 2017.

Results: From a total of eleven patients, nine were male and two were female. One of the patients had surgery twice because of two consecutive aneurysms of the upper limb. From a total of twelve cases, two were subclavian, one was axillary and nine were brachial aneurysms. Three of them had degenerative/idiopathic aetiology, one was associated to a cervical rib and seven occurred in the setting of arteriovenous fistula or kidney graft. Five patients had emergent surgery and the others had elective surgery. All of the patients were submitted to aneurysmectomy. As 30-day complications, there were two haematomas, one compartment syndrome and two early graft occlusions. Four patients needed re-intervention. During the follow-up period, all the grafts initially preserved were patent. There were no further known complications or amputation procedures.

Conclusion: In this review most of the aneurysms were found in patients with haemodialysis vascular access or kidney grafts. Despite the need for early re-intervention in some cases, the surgical treatment of true arterial aneurysms of the upper limb is a low morbidity procedure.
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December 2019

Prediction of MAYV peptide antigens for immunodiagnostic tests by immunoinformatics and molecular dynamics simulations.

Sci Rep 2019 09 16;9(1):13339. Epub 2019 Sep 16.

Universidade Federal de Goiás, Núcleo Colaborativo de BioSistemas, Jataí, GO, 75801-615, Brazil.

The Mayaro virus is endemic to South America, and the possible involvement of Aedes spp. mosquitoes in its transmission is a risk factor for outbreaks of greater proportions. The virus causes a potentially disabling illness known as Mayaro fever, which is similar to that caused by the chikungunya virus. The cocirculation of both viruses, with their clinical and structural similarities, and the absence of prophylactic and therapeutic measures highlight the need for studies that seek to understand the Mayaro virus. Using approaches in silico, we identified an antigenic and specific epitope (p_MAYV4) in domain A of the E2 glycoprotein of the Mayaro virus. This epitope was theoretically predicted to be stable and exposed on the surface of the protein, where it showed key properties that enable its interaction with neutralizing antibodies. These characteristics make it an interesting target for the development of immunodiagnostic platforms. Molecular dynamics simulation-based structural analysis showed that the PHE95 residue in the E1 fusion loop region is conserved among Alphavirus family members. PHE95 interacts with the hydrophobic residues of the E2 glycoprotein to form a cage-shaped structure that is critical to assemble and stabilize the E1/E2 heterodimer. These results provide important insights useful for the advancement of diagnostic platforms and the study of therapeutic alternatives.
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http://dx.doi.org/10.1038/s41598-019-50008-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6746749PMC
September 2019

Molecular and serological surveys of canine distemper virus: A meta-analysis of cross-sectional studies.

PLoS One 2019 29;14(5):e0217594. Epub 2019 May 29.

Enzymology Laboratory, Department of Cell Biology, University of Brasilia, Brasília, Federal District, Brazil.

Background: Canine morbillivirus (canine distemper virus, CDV) persists as a serious threat to the health of domestic dogs and wildlife. Although studies have been conducted on the frequency and risk factors associated with CDV infection, there are no comprehensive data on the current epidemiological magnitude in the domestic dog population at regional and national levels. Therefore, we conducted a cross-sectional study and included our results in a meta-analysis to summarize and combine available data on the frequency and potential risk factors associated with CDV infection.

Methods: For the cross-sectional study, biological samples from dogs suspected to have canine distemper (CD) were collected and screened for viral RNA. Briefly, the PRISMA protocol was used for the meta-analysis, and data analyses were performed using STATA IC 13.1 software.

Results: CDV RNA was detected in 34% (48/141) of dogs suspected to have CD. Following our meta-analysis, 53 studies were selected for a total of 11,527 dogs. Overall, the pooled frequency of CDV positivity based on molecular and serological results were 33% (95% CI: 23-43) and 46% (95% CI: 36-57), respectively. The pooled subgroup analyses of clinical signs, types of biological samples, diagnostic methods and dog lifestyle had a wide range of CDV positivity (range 8-75%). Free-ranging dogs (OR: 1.44, 95% CI: 1.05-1.97), dogs >24 months old (OR: 1.83, 95% CI: 1.1-3) and unvaccinated dogs (OR: 2.92, 95% CI: 1.26-6.77) were found to be positively associated with CDV infection. In contrast, dogs <12 months old (OR: 0.36, 95% CI: 0.20-0.64) and dogs with a complete anti-CDV vaccination (OR: 0.18, 95% CI: 0.05-0.59) had a negative association.

Conclusion: Considering the high frequency of CDV positivity associated with almost all the variables analyzed in dogs, it is necessary to immediately and continuously plan mitigation strategies to reduce the CDV prevalence, especially in determined endemic localities.
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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0217594PLOS
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6541297PMC
January 2020

[Aortic mural thrombus].

Rev Port Cir Cardiotorac Vasc 2019 Jan-Mar;26(1):19-26

Serviço de Angiologia e Cirurgia Vascular, Centro Hospitalar e Universitário de Coimbra, Portugal.

Aortic mural thrombus is a rare clinical finding in the absence of aneurysm or atherosclerosis but an important source of noncardiogenic emboli with a difficult diagnosis and a high rate of complications, including high mortality. It appears to occur more frequently in young adults usually with underlying pro-thrombotic disorder. With the increasing use of high resolution imaging, the asymptomatic mural thrombus became an increasingly frequent finding, but its potential for embolization or the best treatment are still a matter of debate. The management of mural thrombus in non-atherosclerotic aorta represents a challenge because no guidelines are available, and should be individualized. The therapeutic approach should include the triple aspects of aortic mural thrombus: primary disease anticoagulation treatment, surgical thrombectomy to solve embolic complications and endovascular/classical surgery to exclude the thrombus from the aorta. Historically therapeutic anticoagulation was proposed as first-line therapy and surgical intervention was reserved for mobile thrombus, recurrent embolism and contraindication for anticoagulation. However, it is associated with a 25-50% embolic recurrence rate, thrombus persistence in 35% and secondary aortic surgery in up to 31% of the cases. Recent data suggest that endovascular coverage of the aortic thrombus, when feasible, appears to be an effective and safe procedure with a low recurrence and re-embolization rates. In this article we review the published literature concerning this topic.
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September 2019

Rupture of a true brachial artery aneurysm in a kidney transplant patient after arteriovenous fistula ligation: A rare presentation of an unusual disease.

J Vasc Access 2019 01 30;20(1):107-108. Epub 2018 May 30.

Department of Angiology and Vascular Surgery, Coimbra University Hospital, Coimbra, Portugal.

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http://dx.doi.org/10.1177/1129729818776900DOI Listing
January 2019

Endovascular Treatment of a Complicated Type B Acute Aortic Dissection with 3-D ultrasound Control.

Rev Port Cir Cardiotorac Vasc 2017 Jul-Dec;24(3-4):172

Centro Hospitalar Universitário de Coimbra, Portugal.

Introduction: Acute type B aortic dissection (ATBAD), identified within 2 weeks of symptom onset, accounts for 25%-40% of all aortic dissections. Approximately 25% of patients presenting with ATBAD are complicated at admission by malperfusion syndrome or hemodynamic instability, resulting in a high risk of early death when untreated.

Methods: We present a case of a patient with a complicated type B dissection treated by an endovascular technique with control of the sealing zone with transesophageal Echocardiogram (TEE) and 3-D images.

Results: A 56-year-old patient was admitted to the intensive care unit for having a type B aortic dissection complicated by persistent chest pain and uncontrolled hypertension. We perform a TEVAR (thoracic endovascular aortic repair) with a GORE® TAG® conformable thoracic stent graft with active control system to seal the primary entry tear, which covered the left subclavian artery. The origin of the left subclavian artery was covered by the stent graft and a vascular plug was put in place, to avoid endoleak. The procedure was performed with transesophageal echocardiogram with 3-D images to determine if the stent graft was in the true lumen.

Conclusion: The treatment of acute, complicated type B aortic dissection has evolved in the past several years. Thoracic endovascular aortic repair when anatomy is suitable, has been regarded as the preferable treatment to seal the primary entry tear, redirect and re-establish adequate true lumen flow, and thereby promote aortic remodeling. The availability of TEVAR, albeit applied until recently as an off- -label treatment, has clearly produced better results than procedures such as open surgical or endovascular fenestration. However, the results of this treatment may improve when associated with other imaging tests. The TEE has a high performance in the diagnosis of this pathology, especially in regard to the detection of the flap and the two lumens, as well as for the calculation of the size of the entrance tear. It presents an added value in the endovascular treatment, since it helps in the implantation of the devices both for the location of the true lumen, its definitive position and the result of the procedure. TEVAR is the preferred treatment for acute, complicated type B aortic dissection with improved late survival and positive aortic remodelling. The efficacy of this treatment is significantly increased in association with other imaging techniques such as transesophageal echography.
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May 2019

Endovascular Treatment of Carotid Blowout Syndrome.

Rev Port Cir Cardiotorac Vasc 2017 Jul-Dec;24(3-4):170

Centro Hospitalar Universitário de Coimbra, Portugal.

Introduction: Carotid blowout syndrome (CBS) is a life threatening complication associated with head and neck cancers (HNC) and its treatment. The mortality rate was reported to range from 3% to over 50% in the literature. Direct surgical repair of the ruptured internal carotid artery is often not technically possible due to the difficult anatomy and underlying poor co-morbid status. Endovascular techniques such as coil embolization and stent grafting offer an alternative to surgical ligation with better patient outcomes.

Methods: We describe the successful use of an endovascular approach in a case of emergent rupture of the common carotid artery (CCA) with massive bleeding in a patient submitted to radiotheraphy for the treatment of a neck malignancy.

Results: A 75-year-old man with a squamous cell carcinoma of the esophagus having undergone chemotherapy and radiotherapy, was admitted to the emergency room with haematemesis with approximately 1 hour of evolution. An angiogram revealed, in the right common carotid artery, contrast extravasation with a possible fistula communicating to the esophagus. A self-expandable covered stent was deployed in the right common carotid artery. Successful repair of the vessel was confirmed in the control angiogram. The patient was discharged 10 days later without neurological deficit or recurrent bleeding. Carotid blowout syndrome is one of the most complex bleeding complications that may occur in HNC patients. It is usually a life-threatening event and is accompanied with unexpectedly massive bleeding and high mortality/morbidity rates. Short and long term effects of radiation over arteries have been reported. Radiation can induce damage to the vasa vasorum of large arteries and it might lead to the rupture of arteries. In the HNC population with previous surgery or radiotherapy, a high index of suspicion must be maintained for CBS in patients presenting with any recent history of oral bleeding or haemorrhaging from an exposed neck wound.

Conclusion: Current evidence shows that there was no significant difference in technical and hemostatic outcomes between the reconstructive and deconstructive endovascular methods. Permanent vessel occlusion resulted in higher immediately cerebral ischemia and stent grafting induced the more potentially delayed complications, such as infection, rebleeding, and stent thrombosis. In the present case, the endovascular management of CBS of the common carotid artery had high technical success and allowed immediate haemostasis. It has been suggested that self-expanding stent-grafts are useful for the initial control of carotid bleeding but are associated with more delayed complications.
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May 2019

Abdominal Aortic Aneurysm in Women: Retrospective Analysis of the Cases that Undergo Surgical Repair.

Rev Port Cir Cardiotorac Vasc 2017 Jul-Dec;24(3-4):150

CHUC, Portugal.

Introduction: The prevalence of infra-renal aortic abdominal aneurysms (AAA) is about 3 to 4 times higher in men, with a recommendation I 1a for screening men > 65y. Althoug women only represente 20% of the total AAAs they have a significant higher rupture rate - threefold higher - and a worse outcome after ruptured AAA repair. Screening is not consensual but can be recommended for women > 65y who have smoked or have a family history of AAA. Against screening is the fact that the AAA in women have not only a lower incidence but also a late presentation (>80y) but references have been made to the fact that smoking became popular more than 30 years after than men and so the effects just now can start to be seen.

Methods: A retrospective review was made to all women with an infra- renal AAA who undergo a surgical treatment, elective or urgent, in the past 7 years (January 2010 - August 2017) in our hospital. Information was obtained through the clinical process. It was made an evaluation of the demographic information and anatomic features.

Results: 15 cases were reviewed, 4 elective and 11 ruptured surgical repairs. The mean age was 74 and only 4 women were more than 80 years old, with a minium age of 57. More than half the patients were previously diagnosis with hypertension but only 30% had high cholesterol. Only one was a known smoker. None had a diagnosis of cardiac disease. One had a sintomatic cerebrovascular disease. Within the elective cases, all open repair, the intra-hospitalar mortality was zero with a mean stay of 7,5 days. The ruptured cases, 1 endovascular, had a perioperative mortality of 50% The mean aortic diametre at rupture was less than 6 cm.

Conclusion: Data supports the evidence of the morbidity of a ruptured AAA and the high intra-hospitalar mortality in women. Early detection and elective repair should be considered. Sex-specific research is needed to provide the best medical treatment.
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May 2019

Endovascular Removal of Foreign Bodies.

Rev Port Cir Cardiotorac Vasc 2017 Jul-Dec;24(3-4):109

Centro Hospitalar Universitário de Coimbra, Portugal.

Introduction: Intravascular or catheter embolization of a foreign body, either by fracture or migration, is a rare condition, occurring in approximately 1%. This study is focused on the migration of catheters since they represent the majority of cases of embolization. We present one of the largest published series of removal of foreign bodies with endovascular techniques. The objective of the present study is to demonstrate the different locations where foreign bodies, in most cases catheters, can reach, the technique used to remove them and the affected population.

Methods: This is a 9 years retrospective study in which we report the cases of foreign bodies removal performed by an endovascular approach between 2009 and 2017 in our institution. It includes 53 patients: 28 women and 25 men. The average age was 58 years (ranging from 15 to 87 years). The catheters were implanted by a heterogeneous group of professionals.

Results: Thirty three totally implantable catheters (Implantofix ®), sixteen peripheral inserted central catheter, three Guide Wires, one angioplasty balloon and one Amplazer vascular plug were extracted. The most common sites for the lodging of one of the ends of the intravascular foreign bodies were the right atrium (35,8%) the superior vena cava (11,3%) and the right ventricle (11,3%). In 98,1% of the cases, only one venous access was used for extraction of foreign bodies, and in 96,2% of the cases the right femoral access was used. The loop-snare technique was used in 45 cases (84,9%) and in 8 cases a basket was the option. The most common cause of catheter embolization was the disconnection between the catheter and the port during the surgery for its removal, which occurred in 55,1% of the cases. Fracture of totally implantable catheters occurred in 12,2%. The fracture of a peripheral inserted central catheter represents 32,7% of cases of embolization. Atrial fibrillation, occurred in 8 cases. The mortality rate during the procedure was zero. Technical performance was 100% successful.

Conclusion: Percutaneous intervention for removal of intravascular foreign bodies is currently the best treatment option for patients. It is a minimally invasive, procedure, with low complication rates. Embolised material can be quite safely retrieved, and presents an attractive alternative to surgical removal of these devices. However, this work should serve as a consideration about the safety of the removal of catheters as well as their quality in order to reduce this type of complications.
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May 2019

Popliteal artery aneurysm surgical repair: Retrospective unicenter analysis.

Rev Port Cir Cardiotorac Vasc 2015 Jul-Sep;22(3):161-166

Serviço de Angiologia e Cirurgia Vascular, Centro Hospitalar e Universitário de Coimbra, Portugal.

Background: Popliteal artery aneurysm (PAA) thromboembolic complications may result in limb loss. We review our experience reporting outcomes in terms of complications and early and long-term patency rates.

Methods: From 2004 to 2013, 116 PAA required surgical repair at Coimbra Hospital and Universitary Centre, Portugal. Outcomes were analyzed using Kaplan-Meier method with log-rank tests, X2, and Cox proportional hazards models.

Results: A total of 116 PAAs with a mean diameter of 3.3 cm (1.5 to 10 cm) were followed. 40% limbs were asymptomatic and 27% presented with acute ischemia. 97% underwent medial bypass procedure (venous in 66%). Early mortality was 0.9% (1/116). 30-day and five-year cumulative limb salvage was 94.0% and 87%, respectively. There was no limb loss in asymptomatic patients and 1-3 Rutherford chronic ischemia. 62% early amputations were performed in acute ischemia, half of them with functioning bypass. 30-day primary and secondary patency rates were 91% and 97% respectively, higher with GSVs (96% and 99%) than PTFE (58% and 95%, P < .05; Fig 1). The 5-year primary and secondary patency rates were 68.1% and 73,5%, respectively, higher with GSVs (83% and 87%) than PTFE (37% and 43%, P < .05). Two recurrent PAAs (1,7%) required reintervention. Predictors for both amputation and loss of primary patency were PTFE bypass (p =0,002), and emergent surgery (p = 0,005). Acute ischemia was also predictor for amputation (p = 0,026), but not for loss of primary patency.

Conclusions: Results of surgery on asymptomatic PAAs are good - significantly better than those from symptomatic PAAs. The results are similarly good in claudicants. The risks of early and late amputation were higher with prosthetic grafts and in an emergent settings.
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July 2015
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