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Impairment of cellular immunity in patients with malignant external otitis
Abstract:
Immunological studies were performed on 4 elderly diabetic patients with Malignant External Otitis caused by Pseudomonas aeruginosa. Impairment of cellular immunity was found. Skin tests for delayed hypersensitivity to PPD, SK-SD and Mumps antigen were negative and stimulation rates of peripheral blood lymphocytes by PHA, Con-A and PWM were depressed in all 4 patients. Serum immunoglobulins and complement levels were normal except in one case in which paraprotein IgG was found. Peripheral blood lymphoid cell markers and the neutrophil nitroblue tetrazolium (NBT) test were within normal limits in the 2 patients tested. These results indicate that cellular immune deficiency predisposes to the development of Malignant External Otitis in elderly diabetic patients.
Insights
Elderly diabetic patients with Malignant External Otitis showed impaired cellular immunity. This immune deficiency, particularly in cell-mediated responses, may predispose these individuals to developing this severe Pseudomonas aeruginosa infection.
Area of Science:
- Immunology
- Infectious Diseases
- Geriatrics
Background:
- Malignant External Otitis (MEO) is a severe infection often seen in elderly diabetic patients.
- The role of immune status in the pathogenesis of MEO is not fully understood.
Purpose of the Study:
- To investigate the immunological status of elderly diabetic patients diagnosed with Malignant External Otitis.
- To determine if cellular immune deficiency is a predisposing factor for MEO in this patient population.
Main Methods:
- Immunological assessments including skin tests for delayed hypersensitivity (PPD, SK-SD, Mumps antigen) and lymphocyte stimulation assays (PHA, Con-A, PWM) were performed.
- Serum immunoglobulin and complement levels were analyzed.
- Peripheral blood lymphoid cell markers and neutrophil nitroblue tetrazolium (NBT) tests were conducted on available patients.
Main Results:
- All four patients exhibited impaired cellular immunity, evidenced by negative delayed hypersensitivity skin tests and depressed lymphocyte stimulation rates.
- Serum immunoglobulin and complement levels were generally normal, with one patient showing paraprotein IgG.
- Peripheral blood lymphoid cell markers and NBT tests were within normal limits in the tested patients.
Conclusions:
- Cellular immune deficiency is a significant finding in elderly diabetic patients with Malignant External Otitis.
- This impairment in cellular immunity appears to predispose individuals to developing MEO caused by Pseudomonas aeruginosa.