scholarly journals THE INCIDENCE AND PATHOGENESIS OF MYOCARDITIS IN RABBITS AFTER GROUP A STREPTOCOCCAL PHARYNGEAL INFECTIONS

1956 ◽  
Vol 103 (1) ◽  
pp. 173-188 ◽  
Author(s):  
Robert J. Glaser ◽  
Wilbur A. Thomas ◽  
Stephen I. Morse ◽  
James E. Darnell ◽  
Keyword(s):  
Fibrous Tissue ◽  
Giant Cells ◽  
Single Infection ◽  
Myocardial Tissue ◽  
Streptococcal Infections ◽  
Multinucleated Giant Cells ◽  
Infection Group ◽  
Cardiac Lesions ◽  
Group A ◽  
Different Strains

Rabbits subjected to single pharyngeal infections with group A streptococci developed cardiac lesions characterized by myofiber necrosis and a non-granulocytic cellular reaction with histiocytes, lymphocytes, and Anitschkow myocytes. The histopathologic changes were demonstrable in some animals within 24 hours of inoculation, apparently were maximal 72 hours after induction of infection (at which time they were seen in the hearts of all nine rabbits studied), and thereafter healed in the course of the following 2 weeks. The extent of involvement was variable, and with healing the necrotic areas were replaced by fibrous tissue. When intradermal infections with the same organisms were produced in rabbits, cardiac lesions, indistinguishable from those observed in the pharyngeally infected group, appeared in a much smaller number of animals. The hearts of five of six rabbits sacrificed a month or more following the last of a series of streptococcal pharyngeal infections exhibited lesions characterized chiefly by fibrosis, although mononuclear cellular infiltrations were also noted. In these repetitively infected animals the presence of occasional multinucleated giant cells and a few small foci of calcification were features not encountered in the single infection group. In a second series of rabbits sacrificed 3 days after the last of three pharyngeal infections with different strains of streptococci, acute as well as more chronic changes were observed. In none of the lesions in rabbits subjected to single or multiple streptococcal infections were bacteria demonstrable, either in histologic sections or in cultures of myocardial tissue. A large number of control animals was studied concomitantly, and in only one instance was a lesion, considered comparable to those described in the streptococcal series, encountered. The implications of these findings, particularly in terms of the non-suppurative sequelae of streptococcal infections in man, are discussed.

Abstract 288: Distribution of Pathological Features and Inflammatory Cells in Patients With Giant Cell Myocarditis

2020 ◽  
Vol 127 (Suppl_1) ◽  
Author(s):  
LIU SHANGYU ◽  
Yao Yan
Keyword(s):  
T Cells ◽  
Immune Cells ◽  
Giant Cells ◽  
Ventricular Septum ◽  
Free Wall ◽  
Pathological Features ◽  
Multinucleated Giant Cells ◽  
Giant Cell Myocarditis ◽  
Cardiac Lesions ◽  
The Right

Background: Giant-cell myocarditis (GCM) is a rare disease with a poor prognosis. The typical pathological features of GCM include an infiltration of multinucleated giant cells accompanied by numerous inflammatory immune cells. However, the etiology and pathophysiology of GCM remain largely unclear. Methods: Eight patients with pathological diagnoses with GCM underwent heart transplantation at our center. Hematoxylin- eosin (H-E) and Masson’s tri-chrome staining were performed on biopsies of the free walls of the right and left ventricles and interventricular septa of the original hearts to determine the characteristic distribution of cardiac lesions and the composition of infiltrating immune cells. A multiplex immunohistochemistry and multispectral imaging analysis were applied to further classify the specific types of inflammatory immune cells. Results: Inflammation found in a descending frequency gradually from the epicardium to the endocardium in the free wall of the left ventricle, but concentrated on the surface of right ventricular septum. Typical inflammatory infiltration and pathological changes were observed in the right-sided ventricular septum samples from all 8 patients. Numerous inflammatory immune cells, particularly CD4 + T cells, were detected in the lesion, which surrounded the emerging multinucleated giant cells. CD8 + T cells and a small number of regulatory T cells were scattered in the periphery. Conclusions: In GCM, cardiac lesions appear to concentrate particularly beneath the epicardium of the left ventricular free wall and the right side of the ventricular septum. These findings provide a rationale for the diagnostic use of conventional endocardial biopsy. The findings further suggest that myocardial injury is mediated by a variety of lymphocytes, especially CD4 + T cells.

Osseoinduction Evaluation of Hydroxyapatite and Zinc Containing Hydroxyapatite Granules in Rabbits

2011 ◽  
Vol 493-494 ◽  
pp. 252-257 ◽  
Author(s):  
L. Nascimento ◽  
M. Medeiros ◽  
J. Calasans-Maia ◽  
A. Alves ◽  
Antonella M. Rossi ◽  
...  
Keyword(s):  
Histological Analysis ◽  
Bone Matrix ◽  
Fibrous Tissue ◽  
Particle Diameter ◽  
Inflammatory Cells ◽  
Giant Cells ◽  
Multinucleated Giant Cells ◽  
Ethics Commission

This study investigated the osteoinductive potential of granules of stoichiometric hydroxyapatite (HA) and 0.5% zinc containing hydroxyapatite (ZnHA) in intramuscular (IM) site of rabbit’s abdomen. The biomaterials were both used in granular form, with 75% porosity and particle diameter between 450 and 500μm, sintered at 1100°C. Both materials performed adequately on a multiparametric in vitro cytocompatibility assay, indicating their suitability for in vivo testing. After approval by the Ethics Commission on Teaching and Research in Animals, fifteen rabbits were submitted to general anesthesia, incision and tissue dilatation, and a small site was created for HA (right incision) and ZnHA (left incision) intramuscular implantation. The animals were killed after 2, 4 and 12 weeks for biomaterials and surrounding tissues removal. Histological analysis after 2 weeks revealed the presence of granulation tissue surrounding biomaterials with multinucleated giant cells and no newly formed bone for both materials. After 4 weeks there was fibrous tissue involving the material and few inflammatory cells. Following 12 weeks it was observed the presence of connective tissue surrounding the biomaterial, cellularized enough for the two experimental groups, but it was not observed the presence of bone matrix associated with the biomaterials. We conclude that both biomaterials are cytocompatible and did not present the property of osseoinduction after 12 weeks of implantation.

scholarly journals BACTERIOSTATIC EFFECT OF HUMAN SERA ON GROUP A STREPTOCOCCI

1945 ◽  
Vol 82 (2) ◽  
pp. 93-106 ◽  
Author(s):  
Sidney Rothbard
Keyword(s):  
Streptococcal Infection ◽  
Upper Respiratory Tract ◽  
Streptococcal Infections ◽  
Bacteriostatic Effect ◽  
The Third ◽  
Human Sera ◽  
Group A ◽  
Human Adults ◽  
Upper Respiratory ◽  
Different Strains

1. Type-specific antibodies were demonstrated by the indirect bacteriostatic test in sera from human adults convalescing from group A streptococcal infection of the upper respiratory tract. The time of appearance of the antibodies varied from 3 to 5 weeks; and they persisted in 2 patients for at least 37 weeks after the onset of the infection. 2. The specificity of the antibody response in one serum was tested with strains of 7 heterologous types; in another, with 6; and in the third, with 2; but in no instance were cross-reactions observed. Moreover, each convalescent serum showed approximately equal bacteriostasis for 7 different strains of the same type as that which caused the infection. 3. The antibodies were specifically absorbed from the serum by homologous heat-killed streptococci, but not significantly by strains of heterologous types. 4. The specific M antigen of the streptococcal cell with its respective antibody, and not the T substance, appeared to be concerned in the reaction. 5. In spite of numerous technical difficulties inherent in the method, this bacteriostatic test provides a useful procedure for studying type-specific immunity in streptococcal infections.

scholarly journals The Enclosed Leviathan- Pleomorphic Fibroma

2020 ◽  
pp. 1-5
Keyword(s):  
Fibrous Tissue ◽  
Giant Cells ◽  
Multinucleated Giant Cells ◽  
Nuclear Atypia ◽  
Multinucleated Cells ◽  
Collagenous Stroma

Cutaneous pleomorphic fibroma was initially described by Kamino et al in 1989 as a dermal, pauci-cellular neoplasm with an abundant fibrous tissue stroma, atypical fibro-histiocytic cells and disseminated multinucleated giant cells(1). Pleomorphic fibroma is an exceptional, benign, polypoid ordome shaped, sparsely cellular, cutaneous fibroblastic neoplasm characteristically delineating aberrant, pleomorphic, hyperchromatic and giant multinucleated cells embedded in a collagenous stroma (2). Pleomorphic fibroma is contemplated to originate from dendrocytes, in contrast to myofibroblasts. The exceptional neoplasm can simulate adjunctive fibro-histiocytic, melanocytic or lipomatous neoplasia. Despite cellular and nuclear atypia accompanying pleomorphic, bizarre cells, the neoplasm is contemplated as architecturally and biologically benign, on account of exceptional or absent mitosis(2). Pleomorphic fibroma may be interlinked with sclerotic fibroma. Martin-Lopez defined the terminology “pleomorphic sclerotic fibroma” which posits pleomorphic fibroma, sclerotic fibroma and pleomorphic sclerotic fibroma as neoplasia representing a morphologic continuum (3).

CLINICAL AND MORPHOLOGICAL CORRELATIONS AND HISTOPATHOLOGY OF JOINT DAMAGE IN PATIENTS WITH DIFFUSE-TYPE TENOSYNOVIAL GIANT CELL TUMOR

2019 ◽  
Vol 72 (12) ◽  
Author(s):  
Olena O Dyadyk ◽  
Anastasiia Hryhorovska
Keyword(s):  
Giant Cell Tumor ◽  
Giant Cell ◽  
Cell Size ◽  
Giant Cells ◽  
Cell Tumor ◽  
Multinucleated Giant Cells ◽  
Diffuse Type ◽  
Association Coefficient ◽  
Mean Values ◽  
Tenosynovial Giant Cell Tumor

Introduction: Tenosynovial giant cell tumor (TSGCT) (synonym – pigmented villonodular synovitis) – is a rare benign proliferative lesion of the synovial sheath, localized in the joint capsule, bursa or tendon sheath and characterized by locally destructive growth. Depending on the prevalence within the joint elements, the presence of a capsule around the tumor, histophotographic features of cell structure and clinical behavior TSGCT can be divided to localized or diffuse type. The aim of the study was researching of histopathological properties of diffuse-type TSGCT, determine the parameters its morphological indicators and to find out the correlation between these morphological and clinical parameters. Materials and methods: The research material was used biopsy (resect) of pathological lesions from 50 patients who were diagnosed and histologically verified diffuse-type TSGCT. Microscopic examinations of the stained sections and their photo archiving were carried out with use of a Olympus-CX 41 light optical microscope. Group measurable parameters (mean values and Pearson tetrachoric index (association coefficient) were calculated in groups of comparison for morphological and clinical indices of TSGCT. The mean values were compared by Student’s test, P value of ≤0.1 was considered statistically significant. Results:Correlation analysis of indicators that accounted for the pairs of cases «clinic – morphology» revealed the relationships, that had the highest parameters of the association coefficient between such indicators: «presence of villous growths» - «severity of hemosiderosis» (if hypertrophied synovial villi available, with vascular injection and pronounced proliferation of synovial cells, there is also a significant accumulation of hemosiderin pigment); «presence of villous growths» - «type of predominant cellular proliferates» (if cells of TSGCT diffuse type consists of monotonous sheets of stromal cells, with uniform, oval to reniform nuclei, the proliferation of villi in synovial layer is non-distinctive); «presence of nodes» - «kind of stroma» (if nodes predominate, their histological structure is mainly represented by polymorphic clusters of synovitis cells in the form of cells, strands, chains, solid formations, among immature connective tissue with low hyalinosis); «cell size (area, cm²)» - «severity of haemosiderosis» and «cell size (area, cm²)» - «the number of multinucleated giant cells» (there is a pronounced deposition of pigment and accumulation of osteoclast-like multinucleated giant cells type, although usually their number is relatively small compared to the localized type of TSGCT). Conclusions: Morphological parameters, that we have identified, characterize pathological changes in the tissues of TSGCT; careful analysis of the frequency of their occurrence in the different comparison groups made it possible to establish intergroup differences and correlations between individual indicators, which were previously unknown or not obvious. Our study was determine to analyze of incidence rates and correlation relationships, revealed some previously unknown differences and dependencies that are important for understanding the pathogenesis, improvement of diagnosis and prognosis of diffuse-type TSGCT.

Invasive Group A Streptococcal infections in children

2020 ◽  
Vol 16 ◽  
Author(s):  
Molla Imaduddin Ahmed ◽  
Rosalind V Saunders ◽  
Srini Bandi
Keyword(s):  
Early Diagnosis ◽  
Management Practices ◽  
Clinical Presentation ◽  
Streptococcal Infections ◽  
Invasive Group ◽  
Children's Hospital ◽  
Good Outcome ◽  
Children’S Hospital ◽  
Group A

: We reviewed the clinical presentation and management of children with Invasive group A streptococcal infections admitted to our tertiary Children’s Hospital in the last eight years. Our study highlighted the varied symptomatology and management practices in children with iGAS and showed that early diagnosis and prompt initiation of appropriate antibiotics for iGAS can help in resolution of symptoms and good outcome.

scholarly journals ABO groups can play a role in susceptibility and severity of COVID-19

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
S. Samra ◽  
M. Habeb ◽  
R. Nafae
Keyword(s):  
Blood Group ◽  
Abo Blood Group ◽  
Infection Group ◽  
Mechanically Ventilated ◽  
Blood Group A ◽  
Group A ◽  
Study Population ◽  
Group B ◽  
The Relationship ◽  
Seriously Ill

Abstract Background A few people infected by the coronavirus become seriously ill, while others show little to no signs of the symptoms, or are asymptomatic. Recent researches are pointing to the fact that the ABO blood group might play an important role in a person’s susceptibility and severity of COVID-19 infection. Aim of the study: try to understand the relationship between ABO groups and COVID-19 (susceptibility and severity). Results A total of (507) patients were included in this study. The study population was divided based on the ABO blood group into types A+, A−, B+, AB, O+, and O−. Blood group A was associated with high susceptibility of infection: group A, 381 (75.1%); and less common in group O, 97 (19.2%), group B, 18 (3.5%), and group AB, 11 (2.2%). The severity of COVID-19 infection was common in non-blood group O where (20 (7.1%), 4 (26.7%), 2 (11%), and 1 (9%) in type A+, A−, B+, and AB, respectively), while in type O 3.1%. And mechanically ventilated patients were 22 (5.9%), 2 (13.4%), 2 (11.1%), and 1 (1%). Mortality was high in blood groups A and B, 16 (4.37%) and 1 (5.5%), respectively, while in blood group O, it was 1%. Conclusion The incidence, severity, and mortality of COVID-19 were common in non-blood group O. While blood group O was protected against COVID-19.

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