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Original article
Available online 7 March 2024
Influence of lymphopenia on long-term mortality in septic shock, a retrospective observational study
Influencia de la linfopenia en la mortalidad a largo plazo en shock séptico, estudio observacional retrospectivo
J. Rico-Feijoóa,b, J.F. Bermejoc,d,b, A. Pérez-Gonzáleza, S. Martín-Alfonsoa, C. Aldecoaa,b,
Corresponding author
a Servicio de Anestesiología y Reanimación, Hospital Universitario Río Hortega, Gerencia Regional de Salud Valladolid Oeste, Valladolid, Spain
b Centro de Investigación Biomédica en Red en Enfermedades Respiratorias (CiberES), CB22/06/00035, Instituto de Salud Carlos III, Madrid, Spain
c Group for Biomedical Research in Sepsis (BioSepsis), Instituto de Investigación Biomédica de Salamanca, Gerencia Regional de Salud de Castilla y León, Salamanca, Spain
d Universidad de Salamanca, Salamanca, Spain
Received 05 November 2023. Accepted 12 November 2023
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Tables (3)
Table 1. Characteristics of the sample and univariate analysis.
Table 2. Logistic regression models for early and late mortality.
Table 3. Cox proportional hazards survival model for mortality at 2 years.
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Additional material (1)
Abstract
Background and objective

The diagnosis of infection, to diagnose septic shock, has been qualified by leukocyte counts and protein biomarkers. Septic shock mortality is persistently high (20%–50%), and rising in the long term. The definition of sepsis does not include leukocyte count, and lymphopenia has been associated with its mortality in the short term. Immunosuppression and increased mortality in the long term due to sepsis have not been demonstrated. The aim is to relate the occurrence of lymphopenia and its lack of recovery during septic shock with mortality at 2 years.

Patients and methods

Cohort of 332 elderly patients diagnosed with septic shock. Mortality at 28 days and 2 years was analysed according to leukocyte, neutrophil, and lymphocyte counts, and the ability to recover from lymphopenia (LRec).

Results

A total of 74.1% of patients showed lymphopenia, and 73.5% did not improve during ICU stay. Mortality was 31.0% and 50.3% at 28 days and 2 years, respectively. Lymphopenia was a predictor of early mortality (OR 2.96) and LRec of late mortality (OR 3.98). Long-term mortality was associated with LRec (HR 1.69).

Conclusions

In elderly patients with septic shock, 28-day mortality is associated with lymphopenia and neutrophilia, and LRec with 2-year mortality; this may represent 2 distinct phenotypes of behaviour after septic shock.

Keywords:
Lymphopenia
Sepsis
Immunodepression
Septic shock
Resumen
Antecedentes y objetivo

El diagnóstico de infección, para el diagnóstico de shock séptico, se ha venido basando en el recuento leucocitario y biomarcadores proteicos. Su mortalidad es persistentemente alta (20–50%), subiendo a largo plazo. La definición de sepsis no incluye el recuento de leucocitos. La linfopenia se ha relacionado con su mortalidad a corto plazo. No está demostrada la inmunosupresión y aumento de mortalidad por sepsis a largo plazo. El objetivo es relacionar la aparición de linfopenia y la ausencia de su recuperación durante el shock séptico con la mortalidad a los 2 años.

Pacientes y métodos

Cohorte de 332 pacientes ancianos con diagnóstico de shock séptico. Se analiza la mortalidad a 28 días y 2 años en función del recuento de leucocitos, neutrófilos, linfocitos y la capacidad de recuperación de la linfopenia (LRec).

Resultados

El 74,1% de los pacientes mostraron linfopenia, no mejoró durante la estancia en UCI en el 73,5%. La mortalidad fue del 31,0% y 50,3% a los 28 días y 2 años respectivamente. La linfopenia fue predictor de mortalidad precoz (OR 2,96) y LRec de la tardía (OR 3,98). La mortalidad a largo plazo se asoció con LRec (HR 1,69).

Conclusiones

En pacientes ancianos con shock séptico, la mortalidad a los 28 días se asocia con linfopenia y neutrofilia y LRec con la mortalidad a los 2 años, pudiendo representar 2 fenotipos distintos de comportamiento tras el shock séptico

Palabras clave:
Linfopenia
Sepsis
Inmunodepresión
Shock séptico

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