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1.
Viruses ; 13(11)2021 11 21.
Artigo em Inglês | MEDLINE | ID: mdl-34835130

RESUMO

The COVID-19 pandemic is caused by the SARS CoV-2 virus and can lead to severe lung damage and hyperinflammation. In the context of COVID-19 infection, inflammation-induced degradation of the glycocalyx layer in endothelial cells has been demonstrated. Syndecan-1 (SDC-1) is an established parameter for measuring glycocalyx injury. This prospective, multicenter, observational, cross-sectional study analyzed SDC-1 levels in 24 convalescent patients that had been infected with SARS-CoV-2 with mild disease course without need of hospitalization. We included 13 age-matched healthy individuals and 10 age-matched hospitalized COVID-19 patients with acute mild disease course as controls. In convalescent COVID-19 patients, significantly elevated SDC-1 levels were detected after a median of 88 days after symptom onset compared to healthy controls, whereas no difference was found when compared to SDC-1 levels of hospitalized patients undergoing acute disease. This study is the first to demonstrate signs of endothelial damage in non-pre-diseased, convalescent COVID-19 patients after mild disease progression without hospitalization. The data are consistent with studies showing evidence of persistent endothelial damage after severe or critical disease progression. Further work to investigate endothelial damage in convalescent COVID-19 patients should follow.


Assuntos
COVID-19/patologia , Glicocálix/patologia , Sindecana-1/sangue , COVID-19/metabolismo , Estudos Transversais , Endotélio Vascular/patologia , Feminino , Glicocálix/metabolismo , Humanos , Inflamação , Pulmão/patologia , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos
2.
Front Immunol ; 12: 679841, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34421894

RESUMO

Understanding the course of the antibody response directed to individual epitopes of SARS-CoV-2 proteins is crucial for serological assays and establishment of vaccines. Twenty-one synthetic peptides were synthesized that have ten amino acids overlap and cover the complete membrane (M) protein. Plasma samples from 32 patients having acute disease and 30 patients from the convalescent phase were studied. Only peptide M01 (aa 1-20) and to a lesser extent peptide M21 (aa 201-222) showed specific reactivity as compared to historical control plasma samples. Peptide M01 was recognized by IgM- (71.9%) and IgG-specific antibodies (43.8%) during the acute phase as early as day 8 PIO. In a longitudinal analysis, a higher reactivity was observed for the IgM response directed to peptide M01 following day 20 PIO as compared to earlier time points of the acute phase. In the convalescent phase, antibody reactivity to the two M-specific peptides was significantly lower (<30% seropositivity). A fusion protein encoding major parts of RBD also showed higher rates of recognition during acute (50.0%) and lower rates in the convalescent phase (23.3%). Taken together, our results suggest that during the acute phase of COVID-19 antibodies are raised to two linear epitopes of the SARS-CoV-2 M protein, located at the very N- and C-termini, showing almost similar levels of reactivity as immunodominant linear epitopes derived from the spike and nucleocapsid protein. Anti-M is also present in the convalescent phase of COVID-19 patients, however at lower levels, with the N-terminus of the M protein as a preferred target.


Assuntos
Anticorpos Antivirais/imunologia , COVID-19/imunologia , SARS-CoV-2/imunologia , Proteínas da Matriz Viral/imunologia , Adulto , Idoso , Idoso de 80 Anos ou mais , Anticorpos Antivirais/biossíntese , Convalescença , Proteínas do Nucleocapsídeo de Coronavírus/imunologia , Feminino , Humanos , Epitopos Imunodominantes/imunologia , Imunoglobulina M/imunologia , Masculino , Pessoa de Meia-Idade , Gravidade do Paciente , Fragmentos de Peptídeos/imunologia , Proteínas Recombinantes de Fusão/imunologia , SARS-CoV-2/genética , Glicoproteína da Espícula de Coronavírus/imunologia , Proteínas da Matriz Viral/genética
3.
Sci Rep ; 11(1): 12775, 2021 06 17.
Artigo em Inglês | MEDLINE | ID: mdl-34140539

RESUMO

With increasing numbers of patients recovering from COVID-19, there is increasing evidence for persistent symptoms and the need for follow-up studies. This retrospective study included patients without comorbidities, who recovered from COVID-19 and attended an outpatient clinic at a university hospital for follow-up care and potential convalescent plasma donation. Network analysis was applied to visualize symptom combinations and persistent symptoms. Comprehensive lab-testing was ascertained at each follow-up to analyze differences regarding patients with vs without persistent symptoms. 116 patients were included, age range was 18-69 years (median: 41) with follow-ups ranging from 22 to 102 days. The three most frequent persistent symptoms were Fatigue (54%), Dyspnea (29%) and Anosmia (25%). Lymphopenia was present in 13 of 112 (12%) cases. Five of 35 cases (14%) had Lymphopenia in the later follow-up range of 80-102 days. Serum IgA concentration was the only lab parameter with significant difference between patients with vs without persistent symptoms with reduced serum IgA concentrations in the patient cohort of persistent symptoms (p = 0.0219). Moreover, subgroup analyses showed that patients with lymphopenia experienced more frequently persistent symptoms. In conclusion, lymphopenia persisted in a noticeable percentage of recovered patients. Patients with persistent symptoms had significantly lower serum IgA levels. Furthermore, our data provides evidence that lymphopenia is associated with persistence of COVID-19 symptoms.


Assuntos
Anosmia/etiologia , COVID-19/complicações , Dispneia/etiologia , Fadiga/etiologia , Imunoglobulina A/sangue , Linfopenia/etiologia , SARS-CoV-2 , Adolescente , Adulto , Assistência ao Convalescente , Idoso , COVID-19/epidemiologia , COVID-19/virologia , Feminino , Seguimentos , Alemanha/epidemiologia , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Retrospectivos , Adulto Jovem
4.
J Clin Med ; 10(5)2021 Mar 03.
Artigo em Inglês | MEDLINE | ID: mdl-33802479

RESUMO

BACKGROUND: The prone position (PP) is increasingly used in mechanically ventilated coronavirus disease 2019 (COVID-19) acute respiratory distress syndrome (ARDS) patients. However, studies investigating the influence of the PP are currently lacking in these patients. This is the first study to investigate the influence of the PP on the oxygenation and decarboxylation in COVID-19 patients. METHODS: A prospective bicentric study design was used, and in mechanically ventilated COVID-19 patients, PP was indicated from a partial pressure of oxygen in arterial blood (PaO2)/fraction of inspired oxygen (FIO2) ratio of <200. Patients were left prone for 16 h each. Pressure levels, FIO2, were adjusted to ensure a PaO2 greater than 60 mmHg. Blood gas analyses were performed before (baseline 0.5 h), during (1/2/5.5/9.5/13 h), and after being in the PP (1 h), the circulatory/ventilation parameters were continuously monitored, and lung compliance (LC) was roughly calculated. Responders were defined compared to the baseline value (PaO2/FIO2 ratio increase of ≥15%; partial pressure of carbon dioxide (PaCO2) decrease of ≥2%). RESULTS: 13 patients were included and 36 PP sessions were conducted. Overall, PaO2/FIO2 increased significantly in the PP (p < 0.001). Most PaO2/FIO2 responders (29/36 PP sessions, 77%) were identified 9.5 h after turning prone (14% slow responders), while most PaCO2 responders (15/36 PP sessions, 42%) were identified 13 h after turning prone. A subgroup of patients (interval intubation to PP ≥3 days) showed less PaO2/FIO2 responders (16% vs. 77%). An increase in PaCO2 and minute ventilation in the PP showed a significant negative correlation (p < 0.001). LC (median before the PP = 38 mL/cm H2O; two patients with LC >80 mL/cm H2O) showed a significant positive correlation with the 28 day survival of patients (p = 0.01). CONCLUSION: The PP significantly improves oxygenation in COVID-19 ARDS patients. The data suggest that they also benefit most from an early PP. A decrease in minute ventilation may result in fewer PaCO2 responders. LC may be a predictive outcome parameter in COVID-19 patients. TRIAL REGISTRATION: Retrospectively registered.

5.
Dtsch Med Wochenschr ; 145(21): 1544-1551, 2020 10.
Artigo em Alemão | MEDLINE | ID: mdl-33080641

RESUMO

Acute abdomen is a common and sometimes dramatic clinical condition, which can be fatal if diagnosis is not made in time. A large number of diseases can cause an acute abdomen which makes a targeted and rapid diagnostic approach utterly important. The initial diagnostic approach is based on the clinical assessment (including medical history and physical examination) which allows doctors to quickly establish a suspected diagnosis with a relatively high sensitivity but a rather low specificity. Further diagnostics, including laboratory markers, imaging and - if necessary - interventional diagnostics should be initiated quickly after the first clinical assessment in order to confirm the suspected diagnosis or to further classify unclear cases. The clinical assessment is the leading diagnostic tool that determines further diagnostic approaches for patients with an acute abdomen and thus enables adequate and timely therapy.


Assuntos
Abdome Agudo , Abdome Agudo/diagnóstico , Abdome Agudo/etiologia , Diagnóstico Diferencial , Humanos , Exame Físico , Ultrassonografia
6.
Int J Infect Dis ; 100: 314-315, 2020 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-32898672

RESUMO

It is known that severe COVID-19 cases in small children are rare. If a childhood-related infection were protective against a severe course of COVID-19, it would be expected that adults with intensive and regular contact with small children also may have a mild course of COVID-19 more frequently. To test this hypothesis, a survey among 4010 recovered COVID-19 patients was conducted in Germany. 1186 complete answers were collected. 6.9% of these patients reported frequent and regular job-related contact with children below ten years of age, and 23.2% had their own small children, which was higher than expected. In the relatively small subgroup with intensive care treatment (n = 19), patients without contact with small children were overrepresented. These findings are not well explained by age, gender, or BMI distribution of those patients and should be validated in other settings.


Assuntos
COVID-19/transmissão , Gravidade do Paciente , Adolescente , Adulto , Fatores Etários , COVID-19/imunologia , Criança , Estudos de Coortes , Busca de Comunicante , Cuidados Críticos , Saúde da Família , Feminino , Alemanha , Humanos , Masculino , Pessoa de Meia-Idade , SARS-CoV-2 , Inquéritos e Questionários , Resultado do Tratamento , Adulto Jovem
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