1. Volume 103, Issue 5, Pages 1343-1347 (May 1993)
24-Hour Ambulatory Blood Pressure Variability in Obstructive Sleep Apnea Syndrome 
Akiko Noda, M.T., Tamotsu Okada, M.D., Hiroshi Hayashi, M.D., Fumihiko Yasuma, M.D., Mitsuhiro Yokota, M.D. 
CHEST 
Volume 103, Issue 5, Pages (May 1993)
DOI: /chest
Copyright © 1993 The American College of Chest Physicians Terms and Conditions

2. Figure 1
Three types of 24-h blood pressure variability. BP = blood pressure; AI = apnea index; time of SaO2 <90 percent = duration with SaO2 below 90 percent; HI = hyperbolic index; SYS = systole; DIA = diastole.
CHEST  , DOI: ( /chest )
Copyright © 1993 The American College of Chest Physicians Terms and Conditions

3. Figure 2
The 24-h blood pressure variability by periodic regression analysis. SBP = systolic blood pressure; DBP = diastolic blood pressure.
CHEST  , DOI: ( /chest )
Copyright © 1993 The American College of Chest Physicians Terms and Conditions

4. Figure 3
Relationships between sleep parameters and 24-h BP pattern (types 1, 2, and 3) in OSAS. Time of SaO2 <90 percent = duration with SaO2 below 90 percent; ns = not significant.
CHEST  , DOI: ( /chest )
Copyright © 1993 The American College of Chest Physicians Terms and Conditions

5. Figure 4
Correlation between sleep parameters and difference (ΔSBP) between mean waking BP and mean sleep BP SBP = systolic blood pressure; ΔSBP = the difference between mean waking SBP and mean sleep SBP; time of SaO2 <90 percent = duration with SaO2 below 90 percent.
CHEST  , DOI: ( /chest )
Copyright © 1993 The American College of Chest Physicians Terms and Conditions