Correlation between metabolic syndrome and sleep apnea

Table 1 Current criteria for the diagnosis of the metabolic syndrome and sleep apnea severity classification

Factor	IDF
Hypertension	Current antihypertensive therapy or BP ≥ 130/85 mmHg
Dyslipidemia - elevated triglycerides	Plasma triglycerides ≥ 150 mg/dL or specific treatment for high triglycerides
Dyslipidemia - depressed HDL	HDL < 40 mg/dL in men or < 50 mg/dL in women or specific treatment for low HDL
Obesity	Waist circumference > 37 inches in men or > 31.5 inches in women
Glucose	Fasting glucose ≥ 100 mg/dL or previously diagnosed type 2 diabetes
Requirements for diagnosis	Waist circumference criteria plus any 2 of other criteria.
No OSA	AHI < 5/h
Mild	AHI 5-14/h
Moderate	AHI 15-30/h
Severe	AHI > 30/h

BP: Blood pressure; IDF: International Diabetes Federation; HDL: High density lipoprotein; AHI: Apnea-hypopnea index.