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Risk factors for readmission after hospital discharge in chronic obstructive pulmonary disease. The role of quality of life indicators
Risco de reinternamento na doença pulmonar obstrutiva crónica – Estudo prospectivo com ênfase no valor da avaliação da qualidade de vida e depressão
Rui Carneiro1,
Corresponding author
ruicarneiro77@gmail.com

Correspondence to/Correspondência: Rui Carneiro, Hospital de Santo António, Serviço de Medicina Interna, Largo Prof. Abel Salazar, 4099-001 porto
, Cristiana Sousa1, Alexandre Pinto1, Fernanda Almeida2, Júlio R. Oliveira2, Nelson Rocha3
1 Interno Complementar de Medicina Interna/Resident, Internal Medicine, Serviço de Medicina Interna/Internal medicine Unit, Hospital de Santo António, Centro Hospitalar do Porto
2 Assistente Hospitalar de Medicina Interna/Consultant, Internal Medicine, Serviço de Medicina Interna/Internal medicine Unit, Hospital de Santo António, Centro Hospitalar do Porto
3 Chefe de Serviço de Medicina Interna/Head, Internal medicine Unit, Serviço de Medicina Interna/Internal medicine Unit, Hospital de Santo António, Centro Hospitalar do Porto
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        "resumen" => "<span class="elsevierStyleSectionTitle">Aims</span><p id="spar0015" class="elsevierStyleSimplePara elsevierViewall">To identify demographic&#44; clinical&#44; functional and inherent quality of life &#40;QOL&#41; and depression factors with impact on use of the Emergency Services &#40;ES&#41; or readmission after hospital discharge for acute exacerbation of chronic obstructive pulmonary disease &#40;COPD&#41; over a period of 66 weeks&#46; QOL was evaluated by the St&#46; George&#39;s Respiratory Questionnaire &#40;SGRQ&#41;&#46; The Beck Depression Inventory assessed depression&#46;</p><p id="spar0020" class="elsevierStyleSimplePara elsevierViewall">We prospectively evaluated 45 patients &#40;84&#46;4&#37; male&#44; median age 73 years&#44; stage IV 51&#37;&#41;&#46; The median total SGRQ score was 50&#46;6&#44; with a greater impact on symptoms&#44; especially in younger patients &#40;r<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>-0&#46;425&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;043&#41;&#44; and activity limitation than emotional impact of the disease&#46; More than half were depressed&#46; Worse QOL meant depression &#40;R<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;699&#59; p&#61;0&#46;02&#41;&#46; Low FEV1 correlated with depression &#40;r<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>-0&#46;46&#59; p <span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;05&#41; but not with QOL&#46; Long-acting anti-cholinergic bronchodilator and inhaled steroids improved QOL&#46; Almost 85&#37; of patients used ES &#40;25&#46;8&#37; for exacerbated COPD&#41;&#46; Rate of hospital readmission for all reasons and exacerbated COPD was 64&#46;9&#37; and 33&#46;3&#37;&#46; The number of readmissions &#40;all reasons&#41; was correlated with age &#40;R<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;48&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0003&#41;&#44; <span class="elsevierStyleItalic">cor pulmonale</span> &#40;R<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>-0&#46;46&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;03&#41; and QOL &#40;R<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;67&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;004&#41;&#46; Depressed patients &#40;R<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;51&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>004&#41;&#44; with low FEV1 &#40;R<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>-0413&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;04&#41; and with <span class="elsevierStyleItalic">cor pulmonale</span> &#40;R<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>-046&#44; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#46;005&#41; had more inhospital days for exacerbation of COPD&#46;</p><p id="spar0025" class="elsevierStyleSimplePara elsevierViewall">QOL and depression are variables to consider in the evaluation and treatment of patients with COPD as part of a set of clinical and functional data that can predict the risk of readmission after hospital discharge for exacerbated COPD&#46;</p>"
      ]
      "pt" => array:2 [
        "titulo" => "Resumo"
        "resumen" => "<p id="spar0005" class="elsevierStyleSimplePara elsevierViewall">O objectivo do estudo &#233; identificar factores demogr&#225;ficos&#44; cl&#237;nico-funcionais e inerentes &#224; qualidade de vida &#40;QV&#41; e depress&#227;o&#44; com impacto na utiliza&#231;&#227;o do Servi&#231;o de Urg&#234;ncia &#40;SU&#41; e nos reinternamentos ap&#243;s alta hospitalar por agudiza&#231;&#227;o de doen&#231;a pulmonar obstrutiva cr&#243;nica &#40;DPOC&#41; num per&#237;odo de 66 semanas&#46; A QV foi avaliada pelo St&#46; George Respiratory Questionnaire &#40;SGRQ&#41;&#46; A <span class="elsevierStyleItalic">Beck Depression Inventory</span> avaliou a depress&#227;o&#46;</p><p id="spar0010" class="elsevierStyleSimplePara elsevierViewall">Avali&#225;mos prospectivamente 45 doentes &#40;84&#44;4&#37; homens&#59; mediana de idades&#58; 73 anos&#59; est&#225;dio IV&#58;51&#37;&#41;&#46; A mediana do <span class="elsevierStyleItalic">score</span> total do SGRQ foi de 50&#44;6&#44; sendo maior o impacto dos sintomas&#44; principalmente nos mais jovens &#40;r&#58;-0425&#59; p&#58;0&#44;043&#41;&#44; e da limita&#231;&#227;o &#224; actividade do que o impacto emocional&#46; Mais de metade en con travam-se deprimidos&#46; Pior QV associou-se a depress&#227;o &#40;R&#58;0&#44;699&#59;p&#58;0&#44;02&#41;&#46; Valores baixos do VEMS correlacionaram-se com a depress&#227;o &#40;r<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>-0&#44;46&#59;p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;054&#41; mas n&#227;o com QV&#46; A prescri&#231;&#227;o de anticolin&#233;rgicos de longa ac&#231;&#227;o ou cortic&#243;ides inalat&#243;rios melhoraram a QV&#46; Quase 85&#37; dos doentes recorreram ao SU &#40;25&#44;8&#37; por DPOC agudizada&#41;&#46; A taxa de reinternamento por todos os motivos e por DPOC agudizada foi de 64&#44;9&#37; e 33&#44;3&#37; &#40;por unidade de tempo&#41;&#46; O n&#250;mero de reinternamentos &#40;todos os motivos&#41; correlacionou-se com a idade &#40;R<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;48&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;003&#41;&#44; <span class="elsevierStyleItalic">cor pulmonale</span> &#40;R<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>-0&#44;46&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;03&#41; e com a QV &#40;R<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;67 p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;004&#41;&#46; Doentes deprimidos &#40;R&#61;0&#44;51&#59; p&#61;004&#41;&#44; com VEMS baixo &#40;R<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>-0&#44;413&#59; p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;04&#41; e com <span class="elsevierStyleItalic">cor pulmonale</span> &#40;R<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>-046&#59;p<span class="elsevierStyleHsp" style=""></span>&#61;<span class="elsevierStyleHsp" style=""></span>0&#44;005&#41; estiveram mais dias internados por agudiza&#231;&#227;o da DPOC&#46; A QV e a depress&#227;o s&#227;o vari&#225;veis a considerar na avalia&#231;&#227;o e tratamento de doentes com DPOC&#44; fazendo parte dum conjunto de dados cl&#237;nicos&#44; anal&#237;ticos e funcionais que podem predizer o risco de reinternamento ap&#243;s alta por DPOC agudizada&#46;</p>"
      ]
    ]
    "NotaPie" => array:1 [
      0 => array:2 [
        "etiqueta" => "&#9734;"
        "nota" => "<p class="elsevierStyleNotepara">Trabalho parcialmente apresentado no 15&#46;&#176; Congresso Nacional de Medicina Interna&#44; em Mar&#231;o de 2009&#44; e premiado como Melhor Comunica&#231;&#227;o Oral&#47;<span class="elsevierStyleItalic">Work partly presented at the 15th National Congress of Internal Medicine&#44; March 2009&#44; and awarded the prize for Best Oral Communication</span></p>"
      ]
    ]
    "bibliografia" => array:2 [
      "titulo" => "Bibliography&#47;Bibliografia"
      "seccion" => array:1 [
        0 => array:2 [
          "identificador" => "bibs0005"
          "bibliografiaReferencia" => array:28 [
            0 => array:3 [
              "identificador" => "bib1"
              "etiqueta" => "1&#46;"
              "referencia" => array:1 [
                0 => array:1 [
                  "referenciaCompleta" => "Direc&#231;&#227;o-Geral da Sa&#250;de&#46; Programa Nacional de Prevencao e Controlo da Doenca Pulmonar Obstrutiva Cr&#243;nica&#44; 2004&#46; Acedido em <a class="elsevierStyleInterRef" href="http://www.dgs.pt/">www&#46;dgs&#46;pt</a> a 5 de Maio de 2005&#46;"
                ]
              ]
            ]
            1 => array:3 [
              "identificador" => "bib2"
              "etiqueta" => "2&#46;"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "The costs of exacerbations in chronic obstructive pulmonary disease"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => true
                          "autores" => array:3 [
                            0 => "F&#46; Anderson"
                            1 => "S&#46; Borg"
                            2 => "S&#46;A&#46; Jansson"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:1 [
                      "Revista" => array:5 [
                        "tituloSerie" => "Resp Med"
                        "fecha" => "2002"
                        "volumen" => "96"
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                      ]
                    ]
                  ]
                ]
              ]
            ]
            2 => array:3 [
              "identificador" => "bib3"
              "etiqueta" => "3&#46;"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Patient-assessed health outcomes in chronic lung disease&#58; what are they&#44; how do they help us and where do we go from here&#63;"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:3 [
                            0 => "R&#46; Curtis"
                            1 => "D&#46; Martin"
                            2 => "T&#46; Martin"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.1164/ajrccm.156.4.97-02011"
                      "Revista" => array:6 [
                        "tituloSerie" => "Am J Resp Crit Care Med"
                        "fecha" => "1997"
                        "volumen" => "156"
                        "paginaInicial" => "1032"
                        "paginaFinal" => "1039"
                        "link" => array:1 [
                          0 => array:2 [
                            "url" => "https://www.ncbi.nlm.nih.gov/pubmed/9351600"
                            "web" => "Medline"
                          ]
                        ]
                      ]
                    ]
                  ]
                ]
              ]
            ]
            3 => array:3 [
              "identificador" => "bib4"
              "etiqueta" => "4&#46;"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Functional status and well-being of patients with chronic conditions&#58; results from the medical outcomes study"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => true
                          "autores" => array:3 [
                            0 => "A&#46; Stewart"
                            1 => "R&#46; Greenfield"
                            2 => "R&#46; Hayes"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:1 [
                      "Revista" => array:6 [
                        "tituloSerie" => "JAMA"
                        "fecha" => "1989"
                        "volumen" => "262"
                        "paginaInicial" => "907"
                        "paginaFinal" => "913"
                        "link" => array:1 [
                          0 => array:2 [
                            "url" => "https://www.ncbi.nlm.nih.gov/pubmed/2754790"
                            "web" => "Medline"
                          ]
                        ]
                      ]
                    ]
                  ]
                ]
              ]
            ]
            4 => array:3 [
              "identificador" => "bib5"
              "etiqueta" => "5&#46;"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "How well do we care for patients with end stage chronic obstructive pulmonary disease &#40;COPD&#41;&#63; A comparison of palliative and quality of life in COPD and lung cancer"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:3 [
                            0 => "J&#46; Gore"
                            1 => "C&#46; Brophy"
                            2 => "M&#46; Greenstone"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:1 [
                      "Revista" => array:6 [
                        "tituloSerie" => "Thorax"
                        "fecha" => "2000"
                        "volumen" => "55"
                        "paginaInicial" => "1000"
                        "paginaFinal" => "1006"
                        "link" => array:1 [
                          0 => array:2 [
                            "url" => "https://www.ncbi.nlm.nih.gov/pubmed/11083884"
                            "web" => "Medline"
                          ]
                        ]
                      ]
                    ]
                  ]
                ]
              ]
            ]
            5 => array:3 [
              "identificador" => "bib6"
              "etiqueta" => "6&#46;"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Risk factors for rehospitalization in COPD&#58; role of health status&#44; anxiety and depression"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => true
                          "autores" => array:3 [
                            0 => "G&#46; Gudmundsson"
                            1 => "T&#46; Gislason"
                            2 => "C&#46; Janson"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.1183/09031936.05.00078504"
                      "Revista" => array:6 [
                        "tituloSerie" => "Eur Respir J"
                        "fecha" => "2005"
                        "volumen" => "26"
                        "paginaInicial" => "414"
                        "paginaFinal" => "419"
                        "link" => array:1 [
                          0 => array:2 [
                            "url" => "https://www.ncbi.nlm.nih.gov/pubmed/16135721"
                            "web" => "Medline"
                          ]
                        ]
                      ]
                    ]
                  ]
                ]
              ]
            ]
            6 => array:3 [
              "identificador" => "bib7"
              "etiqueta" => "7&#46;"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Using quality of life to predict hospitalization and mortality with obstructive lung diseases"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:5 [
                            0 => "V&#46; Fan"
                            1 => "J&#46; Curtis"
                            2 => "S&#46;-P&#46; Tu"
                            3 => "M&#46; Mcdonell"
                            4 => "S&#46; Fihn"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:1 [
                      "Revista" => array:6 [
                        "tituloSerie" => "Chest"
                        "fecha" => "2002"
                        "volumen" => "122"
                        "paginaInicial" => "429"
                        "paginaFinal" => "436"
                        "link" => array:1 [
                          0 => array:2 [
                            "url" => "https://www.ncbi.nlm.nih.gov/pubmed/12171813"
                            "web" => "Medline"
                          ]
                        ]
                      ]
                    ]
                  ]
                ]
              ]
            ]
            7 => array:3 [
              "identificador" => "bib8"
              "etiqueta" => "8&#46;"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Depression&#44; anxiety and health status after hospitalization for COPD&#58; a multicentre study in the Nordic countries"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => true
                          "autores" => array:3 [
                            0 => "G&#46; Gudmundsson"
                            1 => "T&#46; Gislason"
                            2 => "C&#46; Janson"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.1016/j.rmed.2005.04.003"
                      "Revista" => array:6 [
                        "tituloSerie" => "Respir Med"
                        "fecha" => "2006"
                        "volumen" => "100"
                        "paginaInicial" => "87"
                        "paginaFinal" => "93"
                        "link" => array:1 [
                          0 => array:2 [
                            "url" => "https://www.ncbi.nlm.nih.gov/pubmed/15893921"
                            "web" => "Medline"
                          ]
                        ]
                      ]
                    ]
                  ]
                ]
              ]
            ]
            8 => array:3 [
              "identificador" => "bib9"
              "etiqueta" => "9&#46;"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Prospective multicenter study of relapse following emergency department treatment of COPD exacerbation"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => true
                          "autores" => array:3 [
                            0 => "S&#46; Kim"
                            1 => "C&#46; Emerman"
                            2 => "R&#46; Cydulka"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:1 [
                      "Revista" => array:7 [
                        "tituloSerie" => "Chest"
                        "fecha" => "2004"
                        "volumen" => "125"
                        "numero" => "2"
                        "paginaInicial" => "473"
                        "paginaFinal" => "481"
                        "link" => array:1 [
                          0 => array:2 [
                            "url" => "https://www.ncbi.nlm.nih.gov/pubmed/14769727"
                            "web" => "Medline"
                          ]
                        ]
                      ]
                    ]
                  ]
                ]
              ]
            ]
            9 => array:3 [
              "identificador" => "bib10"
              "etiqueta" => "10&#46;"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Mortality in COPD patients discharged from hospital&#58; the role of treatment and co-morbidity"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => true
                          "autores" => array:3 [
                            0 => "G&#46; Gudmundsson"
                            1 => "T&#46; Gislason"
                            2 => "Lindberg"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.1186/1465-9921-7-109"
                      "Revista" => array:6 [
                        "tituloSerie" => "Respiratory Research"
                        "fecha" => "2006"
                        "volumen" => "7"
                        "paginaInicial" => "109"
                        "paginaFinal" => "118"
                        "link" => array:1 [
                          0 => array:2 [
                            "url" => "https://www.ncbi.nlm.nih.gov/pubmed/16914029"
                            "web" => "Medline"
                          ]
                        ]
                      ]
                    ]
                  ]
                ]
              ]
            ]
            10 => array:3 [
              "identificador" => "bib11"
              "etiqueta" => "11&#46;"
              "referencia" => array:1 [
                0 => array:1 [
                  "referenciaCompleta" => "Global Initiative for Chronic Obstructive Lung Disease&#58; Global Strategy for the diagnosis&#44; management&#44; and prevention of chronic obstructive pulmonary disease&#46; 2008&#46; Acedido em <a class="elsevierStyleInterRef" href="http://www.goldcopd.org/">www&#46;goldcopd&#46;org</a>&#46;"
                ]
              ]
            ]
            11 => array:3 [
              "identificador" => "bib12"
              "etiqueta" => "12&#46;"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Self-complete measure of health status for chronic airflow limitation&#46; The St&#46; George&#39;s Respiratory Questionnaire"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:4 [
                            0 => "P&#46;W&#46; Jones"
                            1 => "F&#46;H&#46; Quirk"
                            2 => "C&#46;M&#46; Baveystock"
                            3 => "O&#46;A&#46; Littlejohns"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:2 [
                      "doi" => "10.1164/ajrccm/145.6.1321"
                      "Revista" => array:6 [
                        "tituloSerie" => "Am Rev Respir Dis"
                        "fecha" => "1992"
                        "volumen" => "145"
                        "paginaInicial" => "1321"
                        "paginaFinal" => "1327"
                        "link" => array:1 [
                          0 => array:2 [
                            "url" => "https://www.ncbi.nlm.nih.gov/pubmed/1595997"
                            "web" => "Medline"
                          ]
                        ]
                      ]
                    ]
                  ]
                ]
              ]
            ]
            12 => array:3 [
              "identificador" => "bib13"
              "etiqueta" => "13&#46;"
              "referencia" => array:1 [
                0 => array:1 [
                  "referenciaCompleta" => "Beck AT&#44; <span class="elsevierStyleItalic">et al&#46;</span> Short form of depression inventory&#58; cross-validation&#46; Psychological Reports 34&#40;3&#41;&#58;1184&#46;"
                ]
              ]
            ]
            13 => array:3 [
              "identificador" => "bib14"
              "etiqueta" => "14&#46;"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Une m&#233;thode de classification social d&#8217;&#233;chantillons de population"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:1 [
                            0 => "M&#46; Graffar"
                          ]
                        ]
                      ]
                    ]
                  ]
                  "host" => array:1 [
                    0 => array:1 [
                      "Revista" => array:4 [
                        "tituloSerie" => "Courier CIE"
                        "fecha" => "1956"
                        "volumen" => "6"
                        "paginaInicial" => "445"
                      ]
                    ]
                  ]
                ]
              ]
            ]
            14 => array:3 [
              "identificador" => "bib15"
              "etiqueta" => "15&#46;"
              "referencia" => array:1 [
                0 => array:2 [
                  "contribucion" => array:1 [
                    0 => array:2 [
                      "titulo" => "Mortality and mortality-related factors after hospitalization for acute exacerbation of COPD"
                      "autores" => array:1 [
                        0 => array:2 [
                          "etal" => false
                          "autores" => array:3 [
                            0 => "K&#46; Groenewegen"
                            1 => "A&#46; Schols"
                            2 => "E&#46; Wouters"
                          ]
                        ]
                      ]
                    ]
                  ]
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