Values for αβ and γδ T-lymphocytes and CD4+, CD8+, and CD56+ subsets in healthy adult subjects: assessment by age and gender

BACKGROUND

Normal reference values in healthy subjects for T-lymphocytes for both types of receptors, αβ and γδ, and their subsets are yet to be defined. The aim of this study was to measure peripheral blood αβ and γδ total T-lymphocytes and their subsets in a population of healthy subjects, in order to obtain valid reference values for studies in human pathology.

METHODS

We studied a total of 157 healthy subjects, 78 men and 79 women, establishing their levels of CD3+, CD4+, CD8+, CD56+, αβCD3+, αβCD3+CD4+, αβCD3+CD8+, αβCD3+CD56+, γδCD3+, γδCD3+CD4-CD8-, γδCD3+CD8+, and γδCD3+CD56+ T-cells by flow cytometry. The T-cell subsets were compared for different age and gender groups.

RESULTS

A significant decrease in CD3+, CD3+CD4+, CD3+CD4+ αβ, and CD3+ γδ T-cells was observed in elderly subjects. CD3+, CD3+ αβ, and CD3+CD4+ αβ T-cells increased in women, while CD3+CD56+ αβ T-cells increased in men. CONCLUSIONS.: These reference values could be useful in further research studies for assessing changes that occur in the different αβ and γδ T subsets in human pathology.

Deficit of gammadelta T lymphocytes in the peripheral blood of patients with Crohn's disease

BACKGROUND

Gammadelta T lymphocytes are an important component of innate immunity. Previous studies have shown their role in the development of Crohn's-like colitis in mice.

AIMS

The aim of this study was to measure the γδ T lymphocyte levels in Crohn's disease (CD) patients.

METHODS

A prospective study of 40 patients with CD compared with 40 healthy subjects (control group) matched by age and sex was undertaken. Lennard-Jones criteria were used for the diagnosis of CD. Disease activity was measured with the Crohn's disease activity index (CDAI). New patients, patients in remission, and patients with active disease were evaluated. Lymphocytic populations of CD3+, CD4+, CD8+, CD56+, CD19+, and αβ and γδ subsets were measured in the peripheral blood of all participants.

RESULTS

The levels of CD3+, CD4+, CD8+, and CD19+ lymphocytes were decreased in CD patients compared with the control group (P = 0.002, 0.049, 0.003, and 0.023, respectively). Although both γδ and αβ T lymphocytes were lower in patients with CD, γδ T subsets showed the lowest levels in CD patients (mean 0.0259 × 10(9)/l) versus healthy controls (mean 0.0769 × 10(9)/l), P < 0.001. In particular, γδ CD8+ T subsets (mean 0.0068 × 10(9)/l) had the largest difference compared to the control group (mean 0.0199 × 10(9)/l), P = 0.008.

CONCLUSIONS

There is a decrease in the global lymphocyte population in the peripheral blood of patients with CD compared to healthy controls. This decrease is more evident in γδ T lymphocytes, especially γδ CD8+ T subsets. Our conclusion is that these results support the theory that a complex alteration of immune responses that affects the total numbers and function of γδ T cells is present in CD.

Use of non-invasive positive pressure ventilation in emergency departments of hospitals in Spain

A survey was undertaken of the use of non-invasive ventilation (NIV) in Spain. 45.7% of emergency departments use NIV. The average time it has been in use is 4 years. Public hospitals use NIV more frequently (89.5%) as well as teaching hospitals (78.1%). Emergency physicians are the professionals who most frequently use NIV (68.8%). High flux continuous positive airway pressure (58.4%) and facial masks (63.5%) are most commonly used. Only 18.9% of hospitals have quality registration in NIV and 35.6% have protocols for using NIV. The method is underused by technicians working in hospital emergency services and there is a lack of uniform protocols with other departments involved.

Epidemiology of appendectomy and appendicitis in the Valencian community (Spain), 1998-2007

BACKGROUND/AIMS

Our purpose was to study the incidence of appendectomy and appendicitis in the Valencian community (Spain) during a period of 10 years (1998-2007).

METHODS

Data on discharge diagnoses of appendectomy and appendicitis were downloaded from all public hospitals in the Valencian community.

RESULTS

We identified 44,683 cases of appendectomies and 42,742 cases of appendicitis (95.7%) during the study period. The age-standardized incidence rates among men ranked between 132.1 cases per 100,000 population in 2003 and 117.46 cases per 100,000 population in 2000 without a clear trend through the study period. The appendiceal perforation rate was 12.1% and the negative appendectomy rate 4.3%. The global mortality was 0.38%.

CONCLUSIONS

The incidence of appendectomy in our community presents a slight descending trend. This decline is more intense in females. The appendix perforation rate is lower than in other studies. The death rate is similar to other studies; however, it is very low in patients of younger age.