Impaired NK cell activation during acute dengue virus infection: A contributing factor to disease severity

Dengue viral (DENV) infection has a broad clinical spectrum ranging from classical febrile illness to life-threatening disease. Literature suggests that spectrum of illness could be due to differences in innate immune-responses; however, the knowledge is still at infancy. Amongst the various cells involved in innate immune responses, NK cells play a central role, particularly in anti-viral immunity. Thus in this study we have evaluated the role of NK-cells during acute-DENV infection and its influence on severity of disease, by analyzing activation, cytotoxic receptors, cytolytic granule contents and degranulation markers on NK-cells during different stages of infection. Based on the clinical manifestations and severity of the disease, DENV patients were classified into patients with dengue without warning signs (DF), dengue with warning signs (DFWS) and severe dengue (SD) patients. During acute-DENV infection, though there was no alteration in frequency of NK-cells, significant increase in frequency of CD56^bright subset in DF patients (p < 0.05) was observed, while it remained unaltered in SD patients. We also found that, CD56^dim NK-cell subset of DF patients had elevated CD69 expression, granzyme B and intracellular IFN-γ levels compared to SD patients (p < 0.05). Amongst the NK-cell cytotoxicity receptor (NCR), NKp30 receptor was significantly elevated in DF patients (p < 0.05), however in SD patients it was comparable to healthy controls. This receptor is essential for dendritic cells-NK-cells crosstalk for initiating adaptive immune response. IL-15 is known to induce NKp30 expression, which was also seen to be elevated in DF patients (p < 0.05) but unaltered in SD patients. In SD patients, even post-6 days of infection i.e. during recovery phase, CD69 and NKp30 expression did not raise, suggesting impaired NK-cell response in these patients. To summarize, our study reports, that efficient NK cell response during acute phase of DENV infection is crucial for preventing severity of the disease. This study helps in understanding the dynamics of NK cell response in immunopathogenesis of DENV infection; which is crucial for development of efficacious therapeutics as well as vaccine.

Glucose-6-Phosphate Dehydrogenase Deficiency Unveiled by Diabetic Ketoacidosis: A Dual Dilemma

An 18 year old male, known case of Type 1 Diabetes Mellitus was admitted in view of diabetic ketoacidosis. With normalization of blood sugars patient developed gross reddish discoloration of urine. Urine routine microscopy did not reveal RBCs or RBC casts. Peripheral blood smear revealed bite cells, Heinz bodies and spherocytes. Thus a diagnosis of hemolytic anemia with hemoglobinuria was made. Patient's glucose-6-phosphate dehydrogenase (G6PD) levels were below the normal range. G6PD, an enzyme of the HMP shunt, is the most common enzyme defect causing hemolytic anemia. G6PD deficiency related hemolytic crisis is most commonly precipitated by infection, drugs or fava beans. Its association with DKA has been seldom reported.

Altered Sensorium in a Young Male: Marchiafava Bignami Disease Revisited

Marchiafava Bignami disease (MBD) is a rare and devastating complication of chronic alcoholism. Degeneration of the corpus callosum is the hallmark feature of MBD. Early diagnosis of MBD by its typical "Sandwich Sign" on magnetic resonance imaging (MRI). Prompt institution of treatment and strict alcohol abstinence can cause regression of changes and hence, clinical improvement. Here we report the case of a young chronic alcoholic male admitted with altered sensorium and his further course in ward.

Attitudes Toward Euthanasia Among Doctors in a Tertiary Care Hospital in South India: A Cross Sectional study

Context:

Advances in expertise and equipment have enabled the medical profession to exercise more control over the processes of life and death, creating a number of moral and ethical dilemmas. People may live for extended periods with chronic painful or debilitating conditions that may be incurable.

Aim:

This study attempts to study the attitudes of doctors toward euthanasia and the possible factors responsible for these attitudes.

Settings and Design:

A cross-sectional survey of 213 doctors working at a tertiary care hospital was conducted to determine their attitudes toward euthanasia.

Materials and Methods:

A self-administered questionnaire was used to assess attitudes and personal perceptions about euthanasia.

Statistical Analysis Used:

The Chi square test was used to assess factors influencing attitudes toward euthanasia.

Results:

A majority of the respondents (69.3%) supported the concept of euthanasia. Relief from unbearable pain and suffering was the most commonly (80.3%) cited reason for being willing to consider the option of euthanasia. Majority of those who were against euthanasia (66.2%) felt that the freedom to perform euthanasia could easily be misused. Disapproval of euthanasia was associated with religious affiliation (P<0.001) and speciality (P<0.001).

Conclusions:

A majority of the doctors in this study supported euthanasia for the relief of unbearable pain and suffering. Religion and speciality appear to be significant in determining attitudes toward euthanasia.