Chronic non-specific cough in children

Phenotypes of cough in children: A latent class analysis

INTRODUCTION

Distinguishing phenotypes among children with cough helps understand underlying causes. Using a statistical data-driven approach, we aimed to identify and validate cough phenotypes based on measurable traits, physician diagnoses, and prognosis.

METHODS

We used data from the Swiss Paediatric Airway Cohort and included 531 children aged 5-16 years seen in outpatient clinics since 2017. We included children with any parent-reported cough (i.e. cough without a cold, cough at night, cough more than other children, or cough longer than 4 weeks) without current wheeze. We applied latent class analysis to identify phenotypes using nine symptoms and characteristics and selected the best model using the Akaike information criterion. We assigned children to the most likely phenotype and compared the resulting groups for parental atopy history, comorbidities, spirometry, fractional exhaled nitric oxide (FeNO), skin prick tests and specific IgE, physician diagnoses, and 1-year prognosis.

RESULTS

We identified four cough phenotypes: non-specific cough (26%); non-allergic infectious and night cough with snoring and otitis (4%); chronic allergic dry night cough with snoring (9%); and allergic non-infectious cough with rhino-conjunctivitis (61%). Children with the allergic phenotype often had family or personal history of atopy and asthma diagnosis. FeNO was highest for the allergic phenotype [median 17.9 parts per billion (ppb)] and lowest for the non-allergic infectious phenotype [median 7.0 parts per billion (ppb)]. Positive allergy test results differed across phenotypes (p < .001) and were most common among the allergic (70%) and least common among the non-specific cough (31%) phenotypes. Subsequent wheeze was more common among the allergic than the non-specific phenotype.

CONCLUSION

We identified four clinically relevant cough phenotypes with different prognoses. Although we excluded children with current wheeze, most children with cough belonged to allergy-related phenotypes.

Phenotypic characteristics, healthcare use, and treatment in children with night cough compared with children with wheeze

OBJECTIVES

Population-based studies of children with dry night cough alone compared with those who also wheeze are few and inconclusive. We compared how children with dry night cough differ from those who wheeze.

METHODS

LuftiBus in the school is a population-based study of schoolchildren conducted between 2013 and 2016 in Zurich, Switzerland. We divided children into four mutually exclusive groups based on reported dry night cough (henceforth referred as "cough") and wheeze and compared parent-reported symptoms, comorbidities, exposures, FeNO, spirometry, and healthcare use and treatment.

RESULTS

Among 3457 schoolchildren aged 6-17 years, 294 (9%) reported "cough," 181 (5%) reported "wheeze," 100 (3%) reported "wheeze and cough," and 2882 (83%) were "asymptomatic." Adjusting for confounders in a multinomial regression, children with "cough" reported more frequent colds, rhinitis, and snoring than "asymptomatic" children; children with "wheeze" or "wheeze and cough" more often reported hay fever, eczema, and parental histories of asthma. FeNO and spirometry were similar among "asymptomatic" and children with "cough," while children with "wheeze" or "wheeze and cough" had higher FeNO and evidence of bronchial obstruction. Children with "cough" used healthcare less often than those with "wheeze," and they attended mainly primary care. Twenty-two children (7% of those with "cough") reported a physician diagnosis of asthma and used inhalers. These had similar characteristics as children with wheeze.

CONCLUSION

Our representative population-based study confirms that children with dry night cough without wheeze clearly differed from those with wheeze. This suggests asthma is unlikely, and they should be investigated for alternative aetiologies, particularly upper airway disease.

The impact of chronic non-specific cough on children and their families: A narrative literature review

The aim of this article is to critically appraise and synthesize research that examines the impact chronic non-specific cough has on children and their families and to highlight gaps within the research. Chronic non-specific cough refers to a persistent cough without a specific diagnosis. While studies have begun to examine the impact on children and their families, this research has not been synthesized and appraised. A narrative literature review was undertaken. A comprehensive and systematic search was undertaken, using CINAHL, MEDLINE, British Nursing Index, PsycINFO, Cochrane Wiley Library and ASSIA databases. Studies were critically appraised for quality using the Hawker et al.'s appraisal tool. A narrative review of the findings was undertaken. Nine quantitative studies were included in the review. The article suggests that chronic non-specific cough affects the quality of life of both families and children, affecting quality of sleep, impacting upon participation in activities, causing emotional distress and creating substantial demand on the health service. Furthermore, the research highlighted the worries experienced by parents in relation to the cause of their child's cough. The review did not identify any qualitative research in this area and only one study collected data directly from children.

Prevalence of cough throughout childhood: A cohort study

Background

Cough in children is a common reason for medical consultations and affects quality of life. There are little population-based data on the epidemiology of recurrent cough in children and how this varies by age and sex, or between children with and without wheeze. We determined the prevalence of cough throughout childhood, comparing several standardised cough questions. We did this for the entire population and separately for girls and boys, and for children with and without wheeze.

Methods

In a population-based prospective cohort from Leicestershire, UK, we assessed prevalence of cough with repeated questionnaires from early childhood to adolescence. We asked whether the child usually coughed more than other children, with or without colds, had night-time cough or cough triggered by various factors (triggers, related to increased breathing effort, allergic or food triggers). We calculated prevalence from age 1 to 18 years using generalised estimating equations for all children, and for children with and without wheeze.

Results

Of 7670 children, 10% (95% CI 10–11%) coughed more than other children, 69% (69–70%) coughed usually with a cold, 34% to 55% age-dependently coughed without colds, and 25% (25–26%) had night-time cough. Prevalence of coughing more than peers, with colds, at night, and triggered by laughter varied little throughout childhood, while cough without colds and cough triggered by exercise, house dust or pollen became more frequent with age. Cough was more common in boys than in girls in the first decade of life, differences got smaller in early teens and reversed after the age of 14 years. All symptoms were more frequent in children with wheeze.

Conclusions

Prevalence of cough in children varies with age, sex and with the questions used to assess it, suggesting that comparisons between studies are only valid for similar questions and age groups.

Clinical practice guidelines: Approach to cough in children: The official statement endorsed by the Saudi Pediatric Pulmonology Association (SPPA)

Cough is the most common presenting symptom in primary care settings. Cough can impact a child's activity level and ability to sleep, play or attend school and is often a source of parental anxiety. Cough in children differs from that in adults in terms of presentation, etiology and management. The majority of cough attacks in children are related to previous upper respiratory tract infections and have a self-limited nature. Cough management strategies should focus on characterizing the cough by means of clinical assessment to identify and address its underlying etiology accurately. Clinical algorithms based on acute/chronic presentation and specific/non-specific causes of cough have been developed to provide guidance for clinical practice. The application of children-specific guidelines for the management of cough can lead to earlier cough resolution and improved parental quality of life. This paper presents the clinical statement of the Saudi Pediatric Pulmonology Association (SPPA) in relation to the management of cough in children.

Pediatric chronic rhinosinusitis: when should we operate?

PURPOSE OF REVIEW

The timing and role of surgery in the management of pediatric chronic rhinosinusitis (pCRS) remains unclear. This review attempts to summarize the existing literature regarding this topic.

RECENT FINDINGS

pCRS is a complex clinical syndrome that results from multiple potential causes. Multimodal medical therapy is the accepted primary treatment. Adenoidectomy continues to be the appropriate first-line surgical therapy, and the addition of antral lavage or balloon dilation to this procedure may improve outcomes. Functional endoscopic sinus surgery (FESS) in children is safe and effective in relieving symptoms in the majority of patients. Failure to respond to maximal medical therapy continues to be a commonly cited, although poorly defined, requisite for proceeding to surgery. Recent literature has been focused on the outcomes after FESS rather than specifically defining when this intervention should be considered. Nevertheless, the literature seems to continue to support FESS in children with persistent symptoms despite adenoidectomy and appropriate medical treatment for pCRS. As the symptoms of chronic rhinosinusitis (CRS) may result from multiple underlying causes, clinicians must understand that the role and timing of surgery may vary with particular patients' disease.

SUMMARY

Surgical management of CRS in children continues to be a frequent topic of study in the otolaryngology literature. As recent research tends to be focused on outcomes after surgery, further prospective studies comparing surgical versus nonsurgical treatment of CRS will likely be required to better define indications for proceeding to surgery at all.

The 2002-2007 trends of prevalence of asthma, allergic rhinitis and eczema in Irish schoolchildren

BACKGROUND

Irish adolescents have the third highest asthma prevalence in the world. Few data examine trends of prevalence of asthma and allergic disorders in younger Irish children. We compared the prevalence of asthma, allergic rhinitis and eczema in school children, aged 6-9 in 2002 and 2007.

METHODS

In two cross-sectional studies, parents of children aged 6-9, completed identical ISAAC-based questionnaires in the same 24 Cork City schools in 2002 (n = 1474, response rate = 74.8%) and in 2007 (n = 1535, response rate = 76.2%).

RESULTS

The prevalence of asthma in our study population of schoolchildren, aged 6-9 remained stable in 2007 (23.5%) since the 2002 finding of 21.7% (p = 0.27). Significant increases were found in the prevalence of rhino-conjunctivitis (7.6-10.6%, p = 0.005) and eczema (8.9-13.5%, p < 0.001). In 2007, male preponderance for suffering the symptoms of current asthma existed (M:F 1.2:1, p = 0.075), although it had lost its significance since 2002 (M:F 1.5:1, p < 0.001). M:F ratio for most allergic rhinitis related symptoms moved from equal sex distribution to male predominance (nasal problems ever: 2002 - M:F, 1.1:1, p = 0.117; 2007 - M:F, 1.2:1, p = 0.012, current rhinitis: 2002 - M:F 1.2:1, p = 0.98; 2007 M:F 1.3:1, p = 0.009, hay fever ever: 2002 - M:F 1:1, p = 0.57; 2007 - M:F 1.5:1, p = 0.007). The sex-specific prevalence of rhino-conjunctivitis and the severity of symptoms suffered, remained equally sex distributed in both timeframes. From 2002 to 2007, the prevalence of all the reported symptoms of eczema were equally distributed between the sexes, while lifetime prevalence of eczema moved from male predominance to equal distribution.

CONCLUSION

The prevalence of asthma in 6-9 yr old Cork schoolchildren remained static between 2002 and 2007; however, rhino-conjunctivitis and eczema have become increasingly prevalent. Co-morbidity of allergic conditions continues to pose a considerable health burden in this young population. We also demonstrated an alteration in the sex-specific profile of current asthma and lifetime allergic rhinitis towards equalization in distribution.