title: Is serum cholesterol a risk factor for asthma?
abstract: BACKGROUND
  Proinflammatory role of serum cholesterol in asthma has been recently explored with contradicting results. Clarity on the link between serum cholesterol and asthma may lead to new evolutions in planning management strategies. The objective of our study was to examine the relationship between the serum cholesterol, asthma and its characteristics.
  
  
  METHODS
  A total of 40 asthmatics and 40 normal subjects were examined cross-sectionally and their serum fasting cholesterol and serum high sensitivity C reactive protein (hsCRP) levels were measured along with other baseline investigations. All subjects were non-smokers.
  
  
  RESULTS
  Serum total cholesterol (mean ± SD) among asthmatics was 176.45 ± 30.77 mgs/dL as compared to 163.33 ± 26.38 mgs/dL among normal subjects (P < 0.05). This higher serum cholesterol level was found to be associated with asthma independent of age, gender, body mass index (BMI), socio-economic status and serum hsCRP levels. However, the association was only modest (adjusted odds ratio 1.033; 95% confidence interval [CI] 1.008-1.059). There was no association between the serum cholesterol and asthma characteristics such as duration of illness, intake of inhaled steroids and frequency of emergency department visits. Other risk factors identified were poor ventilation (adjusted odds ratio 9.27; 95%CI 1.83-46.99) and overcrowding (adjusted odds ratio 41.9; 95% CI 3.15-557.46) at home.
  
  
  CONCLUSIONS
  Our study found a modest but significant association between higher levels of serum cholesterol and asthma, which is independent of age, gender, BMI, socio-economic status and serum hsCRP. Future research is required in a larger population to substantiate above association and its clinical implications. Poor ventilation and overcrowding at home are risk factors for asthma possibly facilitating increased exposure to indoor allergens.
authors: Department of Respiratory Medicine, PSG Institute of Medical Sciences and Research, Coimbatore, Tamil Nadu, India.
authors: Karthikeyan
authors: K
authors: Ramaraju
authors: Srikanth
authors: S
authors: Krishnamurthy
authors: Smrithi
authors: S
authors: Maamidi
authors: Anupama Murthy
authors: AM
authors: Kaza
authors: Nithilavalli
authors: N
authors: Balasubramaniam
keywords: Asthma; cholesterol; high sensitivity C reactive protein; indoor hygiene; inflammation