Abstract
Background
Obstructive sleep apnea (OSA) is characterized by repeated apnea, hypopnea, and micro-arousals during sleep. Many studies have described correlations between OSA and multiple systemic diseases, such as cardiovascular, cerebrovascular, and metabolic diseases. The aim of this study was to determine whether the compliance of continuous positive airway pressure (CPAP) affects the short-term systemic responses in OSA patients.
Methods
Twenty-four newly diagnosed OSA patients were enrolled. All subjects used CPAP for 4 weeks. The subjects were divided into two groups according to the rate of using CPAP over 4 hours per night. Complete blood cell count, coagulation results, blood chemistry, lipid profiles, and pulmonary function results were evaluated at baseline, and were followed up after 4 weeks.
Results
After CPAP treatment, WBC count, hemoglobin, hematocrit, albumin, AST, ALT, Cl, and peak expiratory flow rate (PEFR) were significantly changed in the higher compliance group (n=14), whereas platelet count and triglyceride levels were significantly changed in the lower compliance group (n=10). In multivariate analysis, the changes in WBC count, hemoglobin and hematocrit were statistically significant between the higher compliance and lower compliance groups (p=0.0056, 0.0016, and 0.0051).
References
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Table 1.
Variable | Total (n=24) | Lower compliance group (n=10) | Higher compliance group (n=14) | p-value |
---|---|---|---|---|
Age (years) | 48.5±12.6 | 48.0±16.5 | 48.8±9.5 | 0.8839 |
Male: Female | 21: 3 | 9: 1 | 12: 2 | 1.0000 |
BMI | 26.9±3.40 | 26.6±2.90 | 27.0±3.80 | 0.8836 |
Waist circumference (cm) | 94.4±7.50 | 92.5±6.20 | 95.7±8.30 | 0.5003 |
Neck circumference (cm) | ||||
At supine | 41.2±3.30 | 40.2±2.60 | 42.0±3.60 | 0.1926 |
At sitting | 39.7±3.00 | 39.0±2.40 | 40.2±3.30 | 0.3245 |
AHI | 52.4±23.9 | 36.3±16.7 | 63.9±21.9 | 0.0077* |
Table 2.
Table 3.
Variable | Lower compliance group | Higher compliance group | ||||
---|---|---|---|---|---|---|
Baseline | After | p-value | Baseline | After | p-value | |
Blood chemistry | ||||||
Alb | 004.6±0.2 | 004.5±0.2 | 0.3809 | 004.6±0.3 | 004.5±0.3 | 0.0218* |
AST | 024.9±12.9 | 023.2±8.0 | 0.3923 | 029.5±8.4 | 024.7±8.5 | 0.0084* |
ALT | 028.0±17.5 | 025.6±16.7 | 0.2610 | 043.8±21.9 | 033.1±19.5 | 0.0027* |
FBS | 098.6±11.2 | 105.7±15.7 | 0.2028 | 105.0±20.9 | 105.0±9.3 | 1.0000 |
BUN | 015.1±5.4 | 014.3±4.9 | 0.2727 | 015.9±3.9 | 013.8±2.9 | 0.1332 |
Cr | 000.9±0.1 | 001.0±0.2 | 0.7109 | 000.9±0.2 | 000.9±0.1 | 0.9069 |
Na | 140.7±1.6 | 140.7±2.4 | 0.8633 | 139.8±1.4 | 141.0±2.1 | 0.1085 |
K | 004.3±0.4 | 004.3±0.4 | 0.5120 | 004.3±0.3 | 004.3±0.3 | 0.3928 |
Cl | 103.0±1.1 | 103.0±1.7 | 1.0000 | 101.8±1.8 | 103.4±2.1 | 0.0124* |
Lipid profile | ||||||
T-Chol | 188.3±33.4 | 181.6±44.5 | 0.4231 | 198.9±43.2 | 192.7±32.6 | 0.2526 |
TG | 193.2±154.4 | 233.6±163.1 | 0.0306* | 204.8±117.5 | 199.6±70.8 | 0.8435 |
HDL-C | 048.8±16.6 | 045.1±10.6 | 0.6563 | 049.4±11.4 | 047.7±11.8 | 0.1003 |
LDL-C | 120.8±34.6 | 111.8±40.1 | 0.1043 | 126.7±39.2 | 121.7±34.1 | 0.3654 |
* p<0.05. Alb: albumin (g/dL), AST: aspartate transaminase (IU/L), ALT: alanine transaminase (IU/L), FBS: fasting blood sugar (mg/ dL), BUN: blood urea nitrogen (mg/dL), Cr: creatinine (mg/dL), Na: sodium (mmol/L), K: potassium (mmol/L), Cl: chloride (mmol/L), T-Chol: total cholesterol (mg/dlL, TG: triglyceride (mg/dL), HDL-C: high density lipoprotein cholesterol (mg/dL), LDL-C: low density lipoprotein cholesterol (mg/dL)
Table 4.
Variable | Lower compliance group | Higher compliance group | p-value |
---|---|---|---|
ΔWBC | –0.1±1.60 | –1.0±1.10 | 0.1258 |
ΔHb | 0.0±0.30 | –0.6±0.50 | 0.0019* |
ΔHct | 0.5±1.20 | –1.0±1.60 | 0.0251* |
ΔPlt | –13.3±11.3 | 12.1±52.7 | 0.1497 |
ΔAlb | –0.1±0.20 | –0.1±0.10 | 0.5578 |
ΔAST | –1.7±6.00 | –4.8±5.80 | 0.2164 |
ΔALT | –2.4±6.30 | –10.6±10.8 | 0.0418* |
ΔCl | 0.0±1.70 | 1.6±2.00 | 0.0583 |
ΔTG | 40.4±49.9 | –5.2±96.9 | 0.1876 |
ΔPEFR | 0.3±1.30 | –1.1±1.80 | 0.0570 |
Table 5.
Variable | Regression coefficient | Standard error | t-statics | p-value |
---|---|---|---|---|
Age, sex, baseline AHI, and baseline BMI adjusted model | ||||
Compliance group | ||||
ΔWBC | –1.85 | 0.59 | –3.14 | 0.0056* |
ΔHb | –0.75 | 0.20 | –3.72 | 0.0016* |
ΔHct | –2.29 | 0.72 | –3.18 | 0.0051* |
ΔPlt | 2.72 | 17.28 | 0.16 | 0.8767 |
ΔAlb | –0.07 | 0.07 | –0.99 | 0.3354 |
ΔAST | –1.48 | 3.14 | –0.47 | 0.6431 |
ΔALT | –7.13 | 5.04 | –1.41 | 0.1743 |
ΔCl | 1.66 | 1.06 | 1.56 | 0.1359 |
ΔTG | –56.30 | 56.72 | –0.99 | 0.3341 |
ΔPEFR | –2.04 | 1.35 | –1.51 | 0.1476 |