Limits...
An observational study examining the relationship between respiratory symptoms, airway inflammation and bacteriology in children with severe neurodisability.

Trinick RE, Bunni L, Thorburn K, Hackett AP, Dalzell M, McNamara PS - PLoS ONE (2015)

Bottom Line: Elective patients with 16S/18S microbial rDNA positive BAL had higher neutrophil counts (positive, 33[18-70]%; negative, 8[4-38]%: p<0.05) and generally higher symptom scores (positive, 17[5-32]; negative, 5[0-9]: p = 0.097).Streptococcus mitis was commonly identified in BAL from ND children; Pseudomonas aeruginosa was not identified in any sample.Bacterial airway colonisation, particularly with oral commensals, may play a role in both symptom generation and inflammation.

View Article: PubMed Central - PubMed

Affiliation: Alder Hey Children's Hospital NHS Foundation Trust, Eaton Rd, Liverpool, United Kingdom; Institute of Translational Medicine (Child Health), University of Liverpool, Alder Hey Children's Hospital, Eaton Road, Liverpool, United Kingdom.

ABSTRACT

Background: Children with severe neurodisability (ND) commonly suffer from chronic respiratory symptoms that impact greatly on quality of life, and lead to recurrent hospital admissions. This morbidity (and its causes) is poorly described, despite being well recognised by paediatricians. In this study, we characterised respiratory symptoms in children with ND at times of stability and deterioration. We also assessed the relationship between respiratory symptoms, lower airway inflammatory markers and levels of infection/colonisation.

Methods: ND children were recruited upon admission for elective surgery (Elective-ND [n = 16]), or acutely upon admission to Intensive Care (PICU-ND [n = 19]), and compared to healthy control children [n = 12]. Parents completed a validated respiratory symptom questionnaire in which symptoms associated with activity were removed (total maximal score of 108). Bronchoalveolar lavage (BAL) was collected, and BAL neutrophil counts, IL-8 and TGFβ-1 levels measured. BAL microbial analysis was performed using a 16S/18S rRNA gene based assay and Pseudomonas aeruginosa PCR.

Results: All ND children had high levels of respiratory symptoms (median [IQR] symptom score PICU-ND, 55[38-64]; Elective-ND, 26[7-45]; Control, 4[0-7]: p<0.01), which affected their families, particularly at nighttime. Elective-ND patients with a total respiratory symptom score >20 invariably had BAL neutrophilia. Elective patients with 16S/18S microbial rDNA positive BAL had higher neutrophil counts (positive, 33[18-70]%; negative, 8[4-38]%: p<0.05) and generally higher symptom scores (positive, 17[5-32]; negative, 5[0-9]: p = 0.097). Streptococcus mitis was commonly identified in BAL from ND children; Pseudomonas aeruginosa was not identified in any sample.

Conclusions: Children with severe ND often have high levels of chronic respiratory symptoms, which may relate to lower airway inflammation. Bacterial airway colonisation, particularly with oral commensals, may play a role in both symptom generation and inflammation.

No MeSH data available.


Related in: MedlinePlus

Microbes identified in BAL following Molzym Sepsitest analysis for a. Healthy control and Elective-ND patients and b. PICU-ND patients who were on antibiotics (abx) for > 24 hours prior to recruitment and PICU-ND patients who had not received antibiotics prior to PICU admission.(White bars, no microbes detected; Black bars, Streptococcus Mitis; grey bars, other microbes).
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4390362&req=5

pone.0124627.g003: Microbes identified in BAL following Molzym Sepsitest analysis for a. Healthy control and Elective-ND patients and b. PICU-ND patients who were on antibiotics (abx) for > 24 hours prior to recruitment and PICU-ND patients who had not received antibiotics prior to PICU admission.(White bars, no microbes detected; Black bars, Streptococcus Mitis; grey bars, other microbes).

Mentions: Various, predominantly gram-positive bacteria were identified on sequencing (Fig 3). In both ND groups, microbial DNA from Staphylococcus aureus, Streptococcus mitis and Rothia mucilaginosa were most commonly detected. Streptococcus mitis and Rothia mucilaginosa were also identified in the two control patients in whom microbial DNA was detected at <cycle <35. For 78% of microbial identifications, sequence coverage was >97%. Sequence coverage was lower in the other 22% due to overlying mixed sequences, resulting in more limited identification at ‘genus’ level (i.e. Streptococcus species).


An observational study examining the relationship between respiratory symptoms, airway inflammation and bacteriology in children with severe neurodisability.

Trinick RE, Bunni L, Thorburn K, Hackett AP, Dalzell M, McNamara PS - PLoS ONE (2015)

Microbes identified in BAL following Molzym Sepsitest analysis for a. Healthy control and Elective-ND patients and b. PICU-ND patients who were on antibiotics (abx) for > 24 hours prior to recruitment and PICU-ND patients who had not received antibiotics prior to PICU admission.(White bars, no microbes detected; Black bars, Streptococcus Mitis; grey bars, other microbes).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4390362&req=5

pone.0124627.g003: Microbes identified in BAL following Molzym Sepsitest analysis for a. Healthy control and Elective-ND patients and b. PICU-ND patients who were on antibiotics (abx) for > 24 hours prior to recruitment and PICU-ND patients who had not received antibiotics prior to PICU admission.(White bars, no microbes detected; Black bars, Streptococcus Mitis; grey bars, other microbes).
Mentions: Various, predominantly gram-positive bacteria were identified on sequencing (Fig 3). In both ND groups, microbial DNA from Staphylococcus aureus, Streptococcus mitis and Rothia mucilaginosa were most commonly detected. Streptococcus mitis and Rothia mucilaginosa were also identified in the two control patients in whom microbial DNA was detected at <cycle <35. For 78% of microbial identifications, sequence coverage was >97%. Sequence coverage was lower in the other 22% due to overlying mixed sequences, resulting in more limited identification at ‘genus’ level (i.e. Streptococcus species).

Bottom Line: Elective patients with 16S/18S microbial rDNA positive BAL had higher neutrophil counts (positive, 33[18-70]%; negative, 8[4-38]%: p<0.05) and generally higher symptom scores (positive, 17[5-32]; negative, 5[0-9]: p = 0.097).Streptococcus mitis was commonly identified in BAL from ND children; Pseudomonas aeruginosa was not identified in any sample.Bacterial airway colonisation, particularly with oral commensals, may play a role in both symptom generation and inflammation.

View Article: PubMed Central - PubMed

Affiliation: Alder Hey Children's Hospital NHS Foundation Trust, Eaton Rd, Liverpool, United Kingdom; Institute of Translational Medicine (Child Health), University of Liverpool, Alder Hey Children's Hospital, Eaton Road, Liverpool, United Kingdom.

ABSTRACT

Background: Children with severe neurodisability (ND) commonly suffer from chronic respiratory symptoms that impact greatly on quality of life, and lead to recurrent hospital admissions. This morbidity (and its causes) is poorly described, despite being well recognised by paediatricians. In this study, we characterised respiratory symptoms in children with ND at times of stability and deterioration. We also assessed the relationship between respiratory symptoms, lower airway inflammatory markers and levels of infection/colonisation.

Methods: ND children were recruited upon admission for elective surgery (Elective-ND [n = 16]), or acutely upon admission to Intensive Care (PICU-ND [n = 19]), and compared to healthy control children [n = 12]. Parents completed a validated respiratory symptom questionnaire in which symptoms associated with activity were removed (total maximal score of 108). Bronchoalveolar lavage (BAL) was collected, and BAL neutrophil counts, IL-8 and TGFβ-1 levels measured. BAL microbial analysis was performed using a 16S/18S rRNA gene based assay and Pseudomonas aeruginosa PCR.

Results: All ND children had high levels of respiratory symptoms (median [IQR] symptom score PICU-ND, 55[38-64]; Elective-ND, 26[7-45]; Control, 4[0-7]: p<0.01), which affected their families, particularly at nighttime. Elective-ND patients with a total respiratory symptom score >20 invariably had BAL neutrophilia. Elective patients with 16S/18S microbial rDNA positive BAL had higher neutrophil counts (positive, 33[18-70]%; negative, 8[4-38]%: p<0.05) and generally higher symptom scores (positive, 17[5-32]; negative, 5[0-9]: p = 0.097). Streptococcus mitis was commonly identified in BAL from ND children; Pseudomonas aeruginosa was not identified in any sample.

Conclusions: Children with severe ND often have high levels of chronic respiratory symptoms, which may relate to lower airway inflammation. Bacterial airway colonisation, particularly with oral commensals, may play a role in both symptom generation and inflammation.

No MeSH data available.


Related in: MedlinePlus