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Risk factors for Pseudomonas aeruginosa colonization in cystic fibrosis patients
Insights
Pseudomonas aeruginosa colonization in cystic fibrosis (CF) patients often occurs earlier than previously thought. Early diagnosis and gastrointestinal issues are linked to earlier P. aeruginosa acquisition in CF.
Area of Science:
- Pediatric Pulmonology
- Infectious Diseases
- Clinical Medicine
Background:
- Pseudomonas aeruginosa (P. aeruginosa) is a significant pathogen in cystic fibrosis (CF) patients.
- Understanding the timing and risk factors for early P. aeruginosa colonization is crucial for effective management.
Purpose of the Study:
- To investigate the association between early P. aeruginosa colonization and pre-existing clinical factors in CF patients.
- To determine the age of P. aeruginosa acquisition in a cohort of CF patients.
Main Methods:
- Retrospective study of 502 CF patients diagnosed between 1975 and 1988, who were initially not colonized with P. aeruginosa.
- Analysis of clinical data at diagnosis, including age, meconium ileus, gastrointestinal symptoms, pancreatic insufficiency, and respiratory symptoms.
- Comparison of hospitalization rates and days spent in hospital in the year preceding colonization.
Main Results:
- 12% of patients were colonized before age 1, and 44% by age 7.
- In a birth cohort, 23% were colonized before age 1, and 67% by age 7.
- Early P. aeruginosa colonization was associated with early CF diagnosis, meconium ileus, gastrointestinal symptoms, and pancreatic insufficiency.
Conclusions:
- Most P. aeruginosa colonization in CF patients occurs at a younger age than previously reported.
- Early diagnosis of CF and the presence of CF-associated gastrointestinal abnormalities are significant risk factors for earlier P. aeruginosa colonization.
Abstract:
In an attempt to study the association between Pseudomonas aeruginosa colonization and clinical factors present before colonization, we studied 502 patients who attended our cystic fibrosis (CF) clinic between 1975 and 1988 and who were not colonized with P. aeruginosa before the study period. Twelve percent of the patients became colonized with P. aeruginosa before the age of 1 year and 44% by the age of 7 years. In a birth cohort followed from diagnosis during the study period, 23% were colonized with P. aeruginosa before age 1 year and 67% before age 7 years. Early P. aeruginosa colonization was associated with early diagnosis of CF. Presence of meconium ileus, gastrointestinal symptoms and pancreatic insufficiency at the time of diagnosis was also associated with early colonization. There was no association between the presence of respiratory symptoms at the time of diagnosis and age at first P. aeruginosa colonization. In families in which more than one sibling had CF, the age of P. aeruginosa acquisition was similar in the first colonized and the subsequently colonized siblings. In the year before the colonization patients with P. aeruginosa who were older than 1 year had higher rates of hospitalization and spent more days in hospital compared with patients without P. aeruginosa. In conclusion most P. aeruginosa colonization occurs at a younger age than previously reported. Early age at diagnosis and presence of CF-associated gastrointestinal abnormalities increase the likelihood of earlier colonization of P. aeruginosa.