Journal List > Allergy Asthma Respir Dis > v.5(4) > 1059263

Lee, Song, Park, Kim, Park, Kim, Kwon, Kim, Lee, Jee, Choi, Cho, and Kim: Serum micronutrients levels and clinical features of elderly asthmatics

Abstract

Purpose

The prevalence of asthma in the elderly is rapidly increasing. However, we do not fully understand the pathogenesis of elderly asthma, especially for the roles of micronutrients. This study aimed to evaluate the associations between serum levels of micronutrients, including several vitamins and minerals, and clinical features of the elderly asthmatics.

Methods

A total of 317 asthmatics aged 65 or older were enrolled. Serum levels of vitamin D, vitamin B12, folate, Mg, and Se were measured and then the associations between serum micronutrient levels and clinical features of elderly asthmatics were evaluated.

Results

Positive correlations with significance among serum levels of vitamin B12, vitamin D, and folate were found. Serum micronutrients levels showed no difference according to the atopic status and symptom severity. The serum folate level was significantly associated with forced expiratory volume in 1 second, and serum vitamin B12 and folate levels were significantly associated with serum total IgE level. Interestingly, elderly asthmatics with exacerbation history showed significantly lower serum levels of vitamin D and Mg, but significantly higher serum levels of Se.

Conclusion

Serum levels of micronutrients, such as vitamin D, vitamin B12, Mg, folate, and Se, were significantly associated with some clinical features of elderly asthmatics. Clinical meanings of these associations need to be investigated further.

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Table 1.
Baseline characteristics of the study population (n=317)
Characteristic Value
Age (yr) 73.8±4.9 (66–94)
Male sex 170 (53.6)
Body mass index (kg/m2) 24.3±3.3
Atopy 77 (24.3)
Onset of asthma symptom (≥65 yr) 142 (44.8)
Duration of asthma (yr) 7.9±10.9
Chronic rhinosinusitis 79 (24.9)
Current or ex-smoker 141 (44.5)
Previous exacerbation 46 (14.5)
Postbronchodilator % predicted FEV1 79.4±23.8
Postbronchodilator FEV1/FVC 70.8±14.7
Serum total IgE (IU/mL) 417.8±988.5
Serum Na (mmol/L) 142.5±2.9
Serum vitamin B12 (pg/mL) 626.1±342.9
Serum folate (ng/mL) 8.63±8.0
Serum vitamin D3 (ng/mL) 35.5±17.3
Serum Mg (mg/dL) 3.1±8.0
Serum Se (μg/L) 98.0±20.5
KMMSE 27.3±3.0
GDSSFK 20.0±3.9
ACT score 20.5±4.0

Values are presented as mean±standard deviation (range), number (%), or mean± standard deviation.

FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity; KMMSE, Korean version of the Mini-Mental State Examination; GDSSFK, Korean version of the Geriatric Depression Scale Short Form; ACT, asthma control test.

Reference value of micronutrients: Na (135–145 mmol/L), vitamin B12 (160–970 pg/ mL), folate (>1.5 ng/mL), vitamin D3 (7.6–75.0 ng/mL), Mg (1.5–2.5 mg/dL), Se (75–205 μg/L).

24≤KMMSE: normal, 20≤KMMSE<24: mild dementia, 10≤KMMSE<20: moderate dementia, 10>KMMSE: severe dementia.

Maximal score: 30, higher means more depressed.

Table 2.
Correlation amon ng micronutrients
Variable r P-value
Vitamin B12 (pg/mL)    
 Folate 0.197 <0.001
 Se (μg/L) 0.197 <0.001
Folate (ng/mL)    
 Mg (mg/dL) 0.265 <0.001
 Se 0.289 <0.001
Vitamin D3 (ng/mL)    
 Se 0.126 0.024

Pearson correlation.

Table 3.
Association between lung function/total IgE/ACT score and micronutrients
Variable Vitamin B12 (pg/mL) Folate (ng/mL) Vitamin D3 (ng/mL) Mg (mg/dL) Se (μg/L)
Estimate P-value Estimate P-value Estimate P-value Estimate P-value Estimate P-value
FEV1 (%) <0.001 0.453 0.009 0.044 -0.002 0.225 <0.001 0.957 <0.001 0.780
FVC (%) 0.000 0.311 0.004 0.435 -0.002 0.372 -0.003 0.681 -0.002 0.411
FEV1/FVC -0.001 0.714 0.170 0.115 -0.057 0.208 0.065 0.641 0.065 0.131
ACT score <0.001 0.131 -0.008 0.109 -0.001 0.807 0.001 0.917 0.001 0.780
Total IgE (IU/mL) 0.747 0.047 37.575 0.021 5.961 0.243 -12.328 0.526 -4.815 0.131

ACT, asthma control test; FEV1, forced expiratory volume in 1 second; FVC, forced expiratory capacity.

Table 4.
Difference in micronutrients according to previous exacerbation history 1 year prior to the enrollment
Variable AE (+) (n=46) AE (-) (n=271) P-value
Vitamin B12 (pg/mL) 707.8±317.2 600.9±294.9 0.498
Folate (ng/mL) 9.12±8.07 8.70±8.36 0.8085
Vitamin D3 (ng/mL) 34.74±13.58 35.27±18.04 0.031
Mg (mg/dL) 2.15±0.153 3.32±9.01 <0.001
Se (μg/L) 100.5±13.20 97.29±19.59 0.003

AE, acute exacerbation history.

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