Heat stroke. An electron microscopic study of endothelial cell damage and disseminated intravascular coagulation

1968 ◽  
Vol 122 (1) ◽  
pp. 43-47 ◽  
Author(s):  
R. S. Sohal
1970 ◽  
Vol 20 (1) ◽  
pp. 68-74 ◽  
Author(s):  
S Sultana ◽  
A Begum ◽  
MA Khan

Disseminated intravascular coagulation (DIC) is an acquired and complex disorder that occurs in a wide variety of clinical conditions. This is basically a state of increased propensity for clot formation triggered by a variety of stimuli related to such diverse disorders as sepsis, endothelial cell damage (heat stroke, shock), obstetrical complication (abruptio placenta, amniotic fluid embolism, severe preeclampsia and retained intrauterine dead foetus) and neoplasm. DIC is a classic complication of obstetric conditions occurring in more than 50 percent of patients with obstetric causes. In DIC, an unregulated thrombin explosion cause release of free thrombin into the circulation that leads to the clinical features of DIC, with thrombin and plasmin responsible for the thrombotic and haemorrhagic manifestations, respectively. The diagnosis and treatment of this syndrome require an understanding of its pathophysiology, awareness of the disorders that can trigger it and its early recognition. Acute DIC is usually associated with infections, the commonest cause, about 10-20% of patients with gram negative sepsis have evidence of DIC. Chronic DIC is usually associated with retained dead fetus, carcinomatosis. The diagnosis of this syndrome is essentially clinical, with laboratory tests providing confirmatory evidence. Microvascular thrombosis is the primary mechanism in most cases, and end organ failure is a major cause of death. No single diagnostic test exists for DIC. DIC is initially suggested by the following combination; a clinical condition consistent with DIC, thrombocytopenia, prolonged PT, APTT, and presence of FDP/D-dimer. Medical treatment depends on the cause of the DIC. Basically it involves removing the cause for example, delivery of placenta if it is retained or abrupted, delivery of foetus if retained, quick delivery if severe eclampsia and so on, hysterectomy if bleeding can not be controlled from placental site. After then, and/or con-currently treat DIC with blood and plasma transfusions and appropriate supportive measures. As the sequel of DIC can be devastating, early clinical suspicion and laboratory diagnosis are essential. This review article provides essential guideline for the appropriate diagnosis and clinical management of DIC in obstetric patients. Key words: Disseminated intravascular coagulation (DIC); Obstetric; Thrombosis; Fibrin; Ddimer; FDP; Anticoagulant. DOI: http://dx.doi.org/10.3329/jdmc.v20i1.8585 J Dhaka Med Coll. 2011; 20(1) :68-74  


Author(s):  
Mamta Sharma ◽  
Rajkumar .

Disseminated intravascular coagulation is a life threatening complication of ectopic pregnancy. It results from washing out of all important procoagulants. This is basically a state of increased propensity for clot formation triggered by a variety of stimuli related to such diverse disorders as sepsis ,endothelial cell damage (heat stroke and shock), obstetrical complication (abruptio placenta, amniotic fluid embolism, severe preeclampsia and retained intrauterine dead foetus). A case of disseminated intravascular coagulation with septicemic shock following laprotomy for ectopic pregnancy is reported. She was treated by vasopressors, broad spectrum antibiotic and aggressive blood and blood component therapy.


1975 ◽  
Author(s):  
S. W. Jamieson

It has been found that guinea-pig hearts are rejected in hyperacute fashion by the rat. By using inbred strains this model has been found to be markedly reproducible. Electron microscopic studies show that the platelet plays a critical role in the rejection process. An important point is that endothelial cell damage morphologically occurs subsequent to platelet contraction.Flow studies demonstrate that flow through the coronary arteries ceases abruptly between 2 and 3 minutes; this co-inciding with platelet aggregation in the vessels. The heart continues to beat for 10–12 minutes, and then suffers an ischaemic death.30 transplants were performed as controls to fully monitor flow, E. C. G. and microscopic events during the reaction.Ten transplants were performed in rats pre-treated with 150 mgs/kg. Sulphinpyrazone orally daily for 6 days and then transplanted, and ten were performed in rats transplanted and then given 400 mgs/kg sulphinpyrazone I–V before release of the clamps preventing revasularisation of the heart.It was found that rejection time was not significantly changed from the controls (12–14 minutes), but flow studies showed that the coronary circulation remained patent for 5–6 minutes, i.e. twice the time of the control studies, with subsequent delay of E. C. G. changes.


Author(s):  
Glennelle Washington ◽  
Philip P. McGrath ◽  
Peter R. Graze ◽  
Ivor Royston

Herpes-like viruses were isolated from rhesus monkey peripheral blood leucocytes when co-cultivated with WI-38 cells. The virus was originally designated rhesus leucocyte-associated herpesvirus (LAHV) and subsequently called Herpesvirus mulatta (HVM). The original isolations were from juvenile rhesus monkeys shown to be free of antibody to rhesus cytomegalic virus. The virus could only be propagated in human or simian fibroblasts. Use of specific antisera developed from HVM showed no relationship between this virus and other herpesviruses. An electron microscopic study was undertaken to determine the morphology of Herpesvirus mulatta (HVM) in infected human fibroblasts.


Author(s):  
M. J. Kramer ◽  
Alan L. Coykendall

During the almost 50 years since Streptococcus mutans was first suggested as a factor in the etiology of dental caries, a multitude of studies have confirmed the cariogenic potential of this organism. Streptococci have been isolated from human and animal caries on numerous occasions and, with few exceptions, they are not typable by the Lancefield technique but are relatively homogeneous in their biochemical reactions. An analysis of the guanine-cytosine (G-C) composition of the DNA from strains K-1-R, NCTC 10449, and FA-1 by one of us (ALC) revealed significant differences and DNA-DNA reassociation experiments indicated that genetic heterogeneity existed among the three strains. The present electron microscopic study had as its objective the elucidation of any distinguishing morphological characteristics which might further characterize the respective strains.


Author(s):  
L.A. Dell

A new method has been developed which readily offers the microscopist a possibility for both light and electron microscopic study of selected cells from the cerebrospinal fluid. Previous attempts to examine these cells in the spinal fluid at the ultrastructural level were based on modifications of cell pellet techniques developed for peripheral blood. These earlier methods were limited in application by the number of cells in spinal fluid required to obtain a sufficient size pellet and by the lack of an easy method of cellular identification between the light and electron microscopic level. The newly developed method routinely employs microscope slides coated with Siliclad and tungsten oxide for duplicate cytocentrifuge preparations of diagnostic spinal fluid specimens. Work done by Kushida and Suzuki provided a basis for our use of the metal oxide.


Author(s):  
K. C. Liu ◽  
S. F. Tsay

In the histologic and electron microscopic study of the male reproductive system of bullfrog, Rana catesbeiana, a vesicular system associated with spermiogenesis was observed. It appeared in the lumenal space of the seminiferous tubule (Fig. 1), in the heads of spermatids (Fig. 2), associated with the chromatins of the spermatid (Fig. 4). As deduced from sections, this vesicular system consisted of vesicles of various size or a large group of waving and twisted tubules (Fig. 3), After routine procedure of treatment for electron microscopy, the lumens of both of the vesicles and tubules were electron lucent.In human, vesicles and vesicular system associated with reproductive cell and tissue were reported. In abnormal spermiogenesis, flower-like body, actually vesicles, and giant vesicle associated with the head of spermatid were observed. In both cases the number of vesicle was limited from a single one to a few.


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