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Bosch A, Casanova-Batlle E, Constantin I, Rubio C, Ciurana J, Guerra AJ. An Innovative Stereolithography 3D Tubular Method for Ultrathin Polymeric Stent Manufacture: The Effect of Process Parameters. Polymers (Basel) 2023; 15:4298. [PMID: 37959978 PMCID: PMC10650677 DOI: 10.3390/polym15214298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 10/24/2023] [Accepted: 10/30/2023] [Indexed: 11/15/2023] Open
Abstract
In the last decades, researchers have been developing bioresorbable stents (BRS) to overcome the long-term complications of drug-eluting stents (DES). However, BRS technology still presents challenging limitations in terms of manufacturing, materials, or mechanical properties. At this juncture, companies have developed ultrathin DES that may further improve the efficacy and safety profile of traditional DES by reducing the risk of target-lesion and target-vessel failures until BRS are developed. Nonetheless, the metallic platform of ultrathin DES still presents problems related to their cellular response. The use of polymers as a permanent platform in DES has not previously been studied due to the limitations of current manufacturing technologies. In this work, an innovative manufacturing method for polymeric stent production using tubular stereolithography (SLA) technology is proposed both for BRS and for ultrathin polymeric DES. The effects of manufacturing process parameters were studied by modelling the outcomes (stent thickness and strut width) with the key manufacturing variables (exposure, resin volume, and number of layers). Two different laser setups were used to compare the results. Microscopy results proved the merit of this novel tubular SLA process, which was able to obtain stents with 70 μm strut width and thickness in barely 4 min using only 0.2 mL of resin. Differential Scanning Calorimetry (DSC) results showed the stability of the manufacturing method. The results obtained with this innovative technology are promising and overcome the limitations of other previously used and available technologies.
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Affiliation(s)
- Aniol Bosch
- Eurecat, Technology Centre of Catalonia, 08290 Cerdanyola del Vallès, Spain (I.C.); (C.R.)
- Departament of Mechanical Engineering and Industrial Construction, University of Girona, Maria Aurèlia Capmany 61, 17003 Girona, Spain;
| | - Enric Casanova-Batlle
- Departament of Mechanical Engineering and Industrial Construction, University of Girona, Maria Aurèlia Capmany 61, 17003 Girona, Spain;
| | - Iuliana Constantin
- Eurecat, Technology Centre of Catalonia, 08290 Cerdanyola del Vallès, Spain (I.C.); (C.R.)
| | - Carles Rubio
- Eurecat, Technology Centre of Catalonia, 08290 Cerdanyola del Vallès, Spain (I.C.); (C.R.)
| | - Joaquim Ciurana
- Departament of Mechanical Engineering and Industrial Construction, University of Girona, Maria Aurèlia Capmany 61, 17003 Girona, Spain;
| | - Antonio J. Guerra
- Eurecat, Technology Centre of Catalonia, 08290 Cerdanyola del Vallès, Spain (I.C.); (C.R.)
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Casanova-Batlle E, Guerra AJ, Ciurana J. Continuous Based Direct Ink Write for Tubular Cardiovascular Medical Devices. Polymers (Basel) 2020; 13:E77. [PMID: 33379164 PMCID: PMC7794716 DOI: 10.3390/polym13010077] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 12/14/2020] [Accepted: 12/22/2020] [Indexed: 02/07/2023] Open
Abstract
Bioresorbable cardiovascular applications are increasing in demand as fixed medical devices cause episodes of late restenosis. The autologous treatment is, so far, the gold standard for vascular grafts due to the similarities to the replaced tissue. Thus, the possibility of customizing each application to its end user is ideal for treating pathologies within a dynamic system that receives constant stimuli, such as the cardiovascular system. Direct Ink Writing (DIW) is increasingly utilized for biomedical purposes because it can create composite bioinks by combining polymers and materials from other domains to create DIW-printable materials that provide characteristics of interest, such as anticoagulation, mechanical resistance, or radiopacity. In addition, bioinks can be tailored to encounter the optimal rheological properties for the DIW purpose. This review delves into a novel emerging field of cardiovascular medical applications, where this technology is applied in the tubular 3D printing approach. Cardiovascular stents and vascular grafts manufactured with this new technology are reviewed. The advantages and limitations of blending inks with cells, composite materials, or drugs are highlighted. Furthermore, the printing parameters and the different possibilities of designing these medical applications have been explored.
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Affiliation(s)
- Enric Casanova-Batlle
- Grup de Recerca en Enginyeria Producte Procès i Producció (GREP), Universitat de Girona, 17003 Girona, Spain;
| | | | - Joaquim Ciurana
- Grup de Recerca en Enginyeria Producte Procès i Producció (GREP), Universitat de Girona, 17003 Girona, Spain;
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Guerra AJ, Lammel-Lindemann J, Katko A, Kleinfehn A, Rodriguez CA, Catalani LH, Becker ML, Ciurana J, Dean D. Optimization of photocrosslinkable resin components and 3D printing process parameters. Acta Biomater 2019; 97:154-161. [PMID: 31352105 DOI: 10.1016/j.actbio.2019.07.045] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2019] [Revised: 07/19/2019] [Accepted: 07/24/2019] [Indexed: 10/26/2022]
Abstract
The role of 3D printing in the biomedical field is growing. In this context, photocrosslink-based 3D printing procedures for resorbable polymers stand out. Despite much work, more studies are needed on photocuring stereochemistry, new resin additives, new polymers and resin components. As part of these studies it is vital to present the logic used to optimize the amount of each resin constituent and how that effects printing process parameters. The present manuscript aims to analyze the effects of poly(propylene fumarate) (PPF) resin components and their effect on 3D printing process parameters. Diethyl fumarate (DEF), bisacylphosphine oxide (BAPO), Irgacure 784, 2-hydroxy-4-methoxybenzophenone (HMB) and, for the first time, in biomedical 3D printing, ethyl acetate (EA), were the resin components under investigation in this study. Regarding printing process parameters, Exposure Time, Voxel Depth, and Overcuring Depth were the parameters studied. Taguchi Design of Experiments was used to search for the effect of varying these resin constituent concentrations and 3D printing parameters on the curing behavior of 3D printable PPF resins. Our results indicate that resins with higher polymer cross-link density, especially those with a higher content of PPF, are able to be printed at higher voxel depth and with greater success (i.e., high yield). High voxel depth, as long as it does not sacrifice required resolution, is desirable as it speeds printing. Nevertheless, the overall process is governed by the correct setup of the voxel depth in relation to overcuring depth. In regards to resin biocompatibility, it was observed that EA is more effective than DEF, the material we had previously relied on. Our preliminary in vitro cytotoxicity tests indicate that the use of EA does not reduce scaffold biocompatibility as measured by standard cytotoxicity testing (i.e., ISO 10993-5). We demonstrate a workpath for resin constituent concentration optimization through thin film tests and photocrosslinkable process optimization. STATEMENT OF SIGNIFICANCE: We report here the results of a study of photo-crosslinkable polymer resin component optimization for the 3D printing of resorbable poly(propylene fumarate) (PPF) scaffolds. Resin additives are initially optimized for PPF thin film printing. Once those parameters have been optimized the 3D printing process parameters for PPF objects with complex, porous shapes can be optimized. The design of experiments to optimize both polymer thin films and complex porous resorbable polymer scaffolds is important as a guess and check, or in some cases a systematic method, are very likely to be too time consuming to accomplish. Previously unstudied resin components and process parameters are reported.
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Guerra AJ, Lara-Padilla H, Becker ML, Rodriguez CA, Dean D. Photopolymerizable Resins for 3D-Printing Solid-Cured Tissue Engineered Implants. Curr Drug Targets 2019; 20:823-838. [DOI: 10.2174/1389450120666190114122815] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2018] [Revised: 12/02/2018] [Accepted: 12/05/2018] [Indexed: 12/22/2022]
Abstract
With the advent of inexpensive and highly accurate 3D printing devices, a tremendous flurry
of research activity has been unleashed into new resorbable, polymeric materials that can be printed using
three approaches: hydrogels for bioprinting and bioplotting, sintered polymer powders, and solid cured
(photocrosslinked) resins. Additionally, there is a race to understand the role of extracellular matrix components
and cell signalling molecules and to fashion ways to incorporate these materials into resorbable
implants. These chimeric materials along with microfluidic devices to study organs or create labs on
chips, are all receiving intense attention despite the limited number of polymer systems that can accommodate
the biofabrication processes necessary to render these constructs. Perhaps most telling is the limited
number of photo-crosslinkable, resorbable polymers and fabrication additives (e.g., photoinitiators,
solvents, dyes, dispersants, emulsifiers, or bioactive molecules such as micro-RNAs, peptides, proteins,
exosomes, micelles, or ceramic crystals) available to create resins that have been validated as biocompatible.
Advances are needed to manipulate 4D properties of 3D printed scaffolds such as pre-implantation
cell culture, mechanical properties, resorption kinetics, drug delivery, scaffold surface functionalization,
cell attachment, cell proliferation, cell maturation, or tissue remodelling; all of which are necessary for
regenerative medicine applications along with expanding the small set of materials in clinical use. This
manuscript presents a review of the foundation of the most common photopolymerizable resins for solidcured
scaffolds and medical devices, namely, polyethylene glycol (PEG), poly(D, L-lactide) (PDLLA),
poly-ε-caprolactone (PCL), and poly(propylene fumarate) (PPF), along with methodological advances
for 3D Printing tissue engineered implants (e.g., via stereolithography [SLA], continuous Digital Light
Processing [cDLP], and Liquid Crystal Display [LCD]).
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Affiliation(s)
- Antonio J. Guerra
- Department of Plastic and Reconstructive Surgery, The Ohio State University, Columbus, OH 43210, United States
| | - Hernan Lara-Padilla
- Department of Plastic and Reconstructive Surgery, The Ohio State University, Columbus, OH 43210, United States
| | - Matthew L. Becker
- Department of Polymer Science, University of Akron, Akron, OH, United States
| | - Ciro A. Rodriguez
- Department of Plastic and Reconstructive Surgery, The Ohio State University, Columbus, OH 43210, United States
| | - David Dean
- Department of Plastic and Reconstructive Surgery, The Ohio State University, Columbus, OH 43210, United States
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Polonio-Alcalá E, Rabionet M, Guerra AJ, Yeste M, Ciurana J, Puig T. Screening of Additive Manufactured Scaffolds Designs for Triple Negative Breast Cancer 3D Cell Culture and Stem-Like Expansion. Int J Mol Sci 2018; 19:E3148. [PMID: 30322103 PMCID: PMC6213377 DOI: 10.3390/ijms19103148] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Revised: 10/10/2018] [Accepted: 10/11/2018] [Indexed: 12/31/2022] Open
Abstract
Breast cancer stem cells (BCSCs) are tumor-initiating cells responsible for metastasis and tumor reappearance, but their research is limited by the impossibility to cultivate them in a monolayer culture. Scaffolds are three-dimensional (3D) cell culture systems which avoid problems related with culturing BCSC. However, a standardized scaffold for enhancing a BCSC population is still an open issue. The main aim of this study is to establish a suitable poly (lactic acid) (PLA) scaffold which will produce BCSC enrichment, thus allowing them to be studied. Different 3D printing parameters were analyzed using Taguchi experimental design methods. Several PLA scaffold architectures were manufactured using a Fused Filament Fabrication (FFF) 3D printer. They were then evaluated by cell proliferation assay and the configurations with the highest growth rates were subjected to BCSC quantification by ALDH activity. The design SS1 (0.2 mm layer height, 70% infill density, Zigzag infill pattern, 45° infill direction, and 100% flow) obtained the highest proliferation rate and was capable of enhancing a ALDH+ cell population compared to 2D cell culture. In conclusion, the data obtained endorse the PLA porous scaffold as useful for culturing breast cancer cells in a microenvironment similar to in vivo and increasing the numbers of BCSCs.
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Affiliation(s)
- Emma Polonio-Alcalá
- New Therapeutic Targets Laboratory (TargetsLab)-Oncology Unit, Department of Medical Sciences, Faculty of Medicine, University of Girona, Emili Grahit 77, 17003 Girona, Spain.
- Product, Process and Production Engineering Research Group (GREP), Department of Mechanical Engineering and Industrial Construction, University of Girona, Maria Aurèlia Capmany 61, 17003 Girona, Spain.
| | - Marc Rabionet
- New Therapeutic Targets Laboratory (TargetsLab)-Oncology Unit, Department of Medical Sciences, Faculty of Medicine, University of Girona, Emili Grahit 77, 17003 Girona, Spain.
- Product, Process and Production Engineering Research Group (GREP), Department of Mechanical Engineering and Industrial Construction, University of Girona, Maria Aurèlia Capmany 61, 17003 Girona, Spain.
| | - Antonio J Guerra
- Product, Process and Production Engineering Research Group (GREP), Department of Mechanical Engineering and Industrial Construction, University of Girona, Maria Aurèlia Capmany 61, 17003 Girona, Spain.
| | - Marc Yeste
- Biotechnology of Animal and Human Reproduction (TechnoSperm), Department of Biology, Institute of Food and Agricultural Technology, University of Girona, Pic de Peguera 15, 17003 Girona, Spain.
| | - Joaquim Ciurana
- Product, Process and Production Engineering Research Group (GREP), Department of Mechanical Engineering and Industrial Construction, University of Girona, Maria Aurèlia Capmany 61, 17003 Girona, Spain.
| | - Teresa Puig
- New Therapeutic Targets Laboratory (TargetsLab)-Oncology Unit, Department of Medical Sciences, Faculty of Medicine, University of Girona, Emili Grahit 77, 17003 Girona, Spain.
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Guerra AJ, Cano P, Rabionet M, Puig T, Ciurana J. 3D-Printed PCL/PLA Composite Stents: Towards a New Solution to Cardiovascular Problems. Materials (Basel) 2018; 11:E1679. [PMID: 30208592 PMCID: PMC6164695 DOI: 10.3390/ma11091679] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Revised: 09/04/2018] [Accepted: 09/09/2018] [Indexed: 11/16/2022]
Abstract
Biodegradable stents (BRS) offer enormous potential but first they must meet five specific requirements: (i) their manufacturing process must be precise; (ii) degradation should have minimal toxicity; (iii) the rate of degradation should match the recovery rate of vascular tissue; (iv) ideally, they should induce rapid endothelialization to restore the functions of vascular tissue, but at the same time reduce the risk of restenosis; and (v) their mechanical behavior should comply with medical requirements, namely, the flexibility required to facilitate placement but also sufficient radial rigidity to support the vessel. Although the first three requirements have been comprehensively studied, the last two have been overlooked. One possible way of addressing these issues would be to fabricate composite stents using materials that have different mechanical, biological, or medical properties, for instance, Polylactide Acid (PLA) or Polycaprolactone (PCL). However, fashioning such stents using the traditional stent manufacturing process known as laser cutting would be impossible. Our work, therefore, aims to produce PCL/PLA composite stents using a novel 3D tubular printer based on Fused Deposition Modelling (FDM). The cell geometry (shape and area) and the materials (PCL and PLA) of the stents were analyzed and correlated with 3T3 cell proliferation, degradation rates, dynamic mechanical and radial expansion tests to determine the best parameters for a stent that will satisfy the five strict BRS requirements. Results proved that the 3D-printing process was highly suitable for producing composite stents (approximately 85⁻95% accuracy). Both PCL and PLA demonstrated their biocompatibility with PCL stents presenting an average cell proliferation of 12.46% and PLA 8.28% after only 3 days. Furthermore, the PCL/PLA composite stents demonstrated their potential in degradation, dynamic mechanical and expansion tests. Moreover, and regardless of the order of the layers, the composite stents showed (virtually) medium levels of degradation rates and mechanical modulus. Radially, they exhibited the virtues of PCL in the expansion step (elasticity) and those of PLA in the recoil step (rigidity). Results have clearly demonstrated that composite PCL/PLA stents are a highly promising solution to fulfilling the rigorous BRS requirements.
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Affiliation(s)
- Antonio J Guerra
- Department of Mechanical Engineering and Civil Construction, Universitat de Girona, C/Maria Aurèlia Capmany 61, 17003 Girona, Spain.
| | - Paula Cano
- Department of Medical Sciences, Faculty of Medicine, University of Girona, Emili Grahit 77, 17003 Girona, Spain.
| | - Marc Rabionet
- Department of Mechanical Engineering and Civil Construction, Universitat de Girona, C/Maria Aurèlia Capmany 61, 17003 Girona, Spain.
- Department of Medical Sciences, Faculty of Medicine, University of Girona, Emili Grahit 77, 17003 Girona, Spain.
| | - Teresa Puig
- Department of Medical Sciences, Faculty of Medicine, University of Girona, Emili Grahit 77, 17003 Girona, Spain.
| | - Joaquim Ciurana
- Department of Mechanical Engineering and Civil Construction, Universitat de Girona, C/Maria Aurèlia Capmany 61, 17003 Girona, Spain.
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Rabionet M, Polonio E, Guerra AJ, Martin J, Puig T, Ciurana J. Design of a Scaffold Parameter Selection System with Additive Manufacturing for a Biomedical Cell Culture. Materials (Basel) 2018; 11:E1427. [PMID: 30110889 PMCID: PMC6119890 DOI: 10.3390/ma11081427] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 08/08/2018] [Accepted: 08/10/2018] [Indexed: 02/07/2023]
Abstract
Open-source 3D printers mean objects can be quickly and efficiently produced. However, design and fabrication parameters need to be optimized to set up the correct printing procedure; a procedure in which the characteristics of the printing materials selected for use can also influence the process. This work focuses on optimizing the printing process of the open-source 3D extruder machine RepRap, which is used to manufacture poly(ε-caprolactone) (PCL) scaffolds for cell culture applications. PCL is a biocompatible polymer that is free of toxic dye and has been used to fabricate scaffolds, i.e., solid structures suitable for 3D cancer cell cultures. Scaffold cell culture has been described as enhancing cancer stem cell (CSC) populations related to tumor chemoresistance and/or their recurrence after chemotherapy. A RepRap BCN3D+ printer and 3 mm PCL wire were used to fabricate circular scaffolds. Design and fabrication parameters were first determined with SolidWorks and Slic3r software and subsequently optimized following a novel sequential flowchart. In the flowchart described here, the parameters were gradually optimized step by step, by taking several measurable variables of the resulting scaffolds into consideration to guarantee high-quality printing. Three deposition angles (45°, 60° and 90°) were fabricated and tested. MCF-7 breast carcinoma cells and NIH/3T3 murine fibroblasts were used to assess scaffold adequacy for 3D cell cultures. The 60° scaffolds were found to be suitable for the purpose. Therefore, PCL scaffolds fabricated via the flowchart optimization with a RepRap 3D printer could be used for 3D cell cultures and may boost CSCs to study new therapeutic treatments for this malignant population. Moreover, the flowchart defined here could represent a standard procedure for non-engineers (i.e., mainly physicians) when manufacturing new culture systems is required.
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Affiliation(s)
- Marc Rabionet
- Oncology Unit (TargetsLab), Department of Medical Sciences, Faculty of Medicine, University of Girona, Emili Grahit 77, 17003 Girona, Spain.
- Department of Mechanical Engineering and Industrial Construction, University of Girona, Maria Aurèlia Capmany 61, 17003 Girona, Spain.
| | - Emma Polonio
- Oncology Unit (TargetsLab), Department of Medical Sciences, Faculty of Medicine, University of Girona, Emili Grahit 77, 17003 Girona, Spain.
- Department of Mechanical Engineering and Industrial Construction, University of Girona, Maria Aurèlia Capmany 61, 17003 Girona, Spain.
| | - Antonio J Guerra
- Department of Mechanical Engineering and Industrial Construction, University of Girona, Maria Aurèlia Capmany 61, 17003 Girona, Spain.
| | - Jessica Martin
- Oncology Unit (TargetsLab), Department of Medical Sciences, Faculty of Medicine, University of Girona, Emili Grahit 77, 17003 Girona, Spain.
| | - Teresa Puig
- Oncology Unit (TargetsLab), Department of Medical Sciences, Faculty of Medicine, University of Girona, Emili Grahit 77, 17003 Girona, Spain.
| | - Joaquim Ciurana
- Department of Mechanical Engineering and Industrial Construction, University of Girona, Maria Aurèlia Capmany 61, 17003 Girona, Spain.
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Guerra AJ, Cano P, Rabionet M, Puig T, Ciurana J. Effects of different sterilization processes on the properties of a novel 3D-printed polycaprolactone stent. POLYM ADVAN TECHNOL 2018. [DOI: 10.1002/pat.4344] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Antonio J. Guerra
- Universitat de Girona; Mechanical Engineering and Civil Construction; Girona Spain
| | - Paula Cano
- Universitat de Girona; Medical Sciences; Girona Spain
| | - Marc Rabionet
- Universitat de Girona; Mechanical Engineering and Civil Construction; Girona Spain
- Universitat de Girona; Medical Sciences; Girona Spain
| | - Teresa Puig
- Universitat de Girona; Medical Sciences; Girona Spain
| | - Joaquim Ciurana
- Universitat de Girona; Mechanical Engineering and Civil Construction; Girona Spain
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Almeida Santos L, Ruza F, Guerra AJ, Alves A, Dorao P, García S, Santos NT. [Nutritional evaluation of children with respiratory failure (RF): anthropometric evaluation upon admission to the pediatric intensive care units]. An Esp Pediatr 1998; 49:11-6. [PMID: 9718760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
OBJECTIVE Protein-energy malnutrition (PEM) constitutes an important complication in children submitted to intensive care treatment for respiratory failure (RF). This complication is not usually evaluated in assessment protocols. Nutrition assessment in a Pediatric Intensive Care Unit (PICU) was performed in children with respiratory failure. PATIENTS AND METHODS A prospective study involving 65 children (1-158 months of age) with RF at admission to the PICU was carried out. The patients studied were divided into four groups according to their etiology: Group I (n = 29) included those with acute bronchial pathology; Group II (n = 17) those with pneumonia: Group III (n = 11) those in the post-operative period following cardiac surgery; and Group IV (n = 8) those patients with multiple-organ dysfunction. All patients in Groups I, II, and III had chronic diseases. Anthropometrical and nutritional evaluation included weight, height and body mass index (w/h2). RESULTS The weight for age was low (59%). Height deficit was observed in a significantly lower percentage of the patients (13.1%). The body mass index showed values in relationship to the 50th percentile that varied between 83.4 +/- 23.1% and 97.1 +/- 4.7%. In 68.9% of the patients the criteria of global malnutrition were met according to the classification of McLaren and Read. CONCLUSIONS The data confirm that PEM is frequent in patients with RF in the PICU and emphasize the usefulness of anthropometrical evaluation as an important, simple and non-invasive method of nutritional evaluation. Early and intensive nutritional intervention can reduce or prevent the vicious circle of malnutrition in RF patients hospitalized in the PICU.
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Affiliation(s)
- L Almeida Santos
- Unidad de Cuidados Intensivos Pediátricos, Hospital Infantil La Paz, Madrid
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Guerra AJ, Castro EM, Rego C, Monteiro C, Silva D, Lourenço S, Erverdoso H, Rodrigues P, Laires MJ, Guerra FC, Bicho M, Santos NT. [Association of nutritional status, body composition, serum lipids and apolipoproteins, and haptoglobin phenotype in a population of 9- to 12-year olds]. Rev Port Cardiol 1998; 17:47-51. [PMID: 9558954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Affiliation(s)
- A J Guerra
- Departamento de Pediatria, Hospital de São João, Faculdade de Medicina do Porto
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Wilson G, Guerra AJ, Santos NT. Comparative study of the antipyretic effect of ibuprofen (oral suspension) and paracetamol (suppositories) in paediatrics. J Int Med Res 1984; 12:250-4. [PMID: 6468748 DOI: 10.1177/030006058401200405] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Thirty-five pyrexial children with varying pathologies were entered into an open study to compare the antipyretic effect of Ibuprofen oral suspension and paracetamol suppositories. Temperature was recorded at intervals up to 11 hours after dosing. It was found that both treatments had an antipyretic effect, but that the magnitude and duration of the antipyretic effect was greater with ibuprofen.
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