Subjects with higher FRS had a larger neck circumference (40.48 [+ or -] 2.80 versus 39.15 [+ or -] 4.31 cm, p < 0.05), longer course of disease (12.77 [+ or -] 7.89 versus 9.36 [+ or -] 5.98 years, p < 0.05), increased AHI (47.61 [+ or -] 25.63 versus 34.01 [+ or -] 25.72 events/h, p < 0.01), lower minimum oxyhaemoglobin
saturation during sleep (73.85 [+ or -] 11.10 versus 77.91 [+ or -] 9.77%, p < 0.05), longer time with oxyhaemoglobin
saturation <90% (23.46 [+ or -] 24.46 versus 14.48 [+ or -] 18.85%, p < 0.05), and higher ODI (49.62 [+ or -] 23.75 versus 39.01 [+ or -] 24.87 events/h, p < 0.05) .
reaches the oxygen-hungry tissues it releases its oxygen.
Compared to non-REM sleep, REM sleep is associated with longer apnoeic episodes and more frequent oxyhaemoglobin
desaturation (Findley et al 1985).
(13,14) Central to retinal oximetry is the differing spectral properties of oxyhaemoglobin
and deoxyhaemoglobin (see Figure 4).
The concentration changes of oxyhaemoglobin
, [DELTA][Hb[O.SUB.2]], and deoxyhaemoglobin, [DELTA][HHb] were then derived with the MLBL.
The first one corresponds mainly to the bilirubin content and the second one to the oxyhaemoglobin
The mechanism involved in the dramatic increase in oxyhaemoglobin
saturation observed after sternotomy is not entirely clear in the absence of more detailed information on pulmonary mechanics and haemodynamics.
Newer, multiple wavelength oximeters can distinguish carboxyhaemoglobin from oxyhaemoglobin
, as well as give an indication of the total amount of Hb present.
is diamagnetic, while deoxyhaemoglobin is paramagnetic; these different magnetic properties give rise to contrast in magnetic resonance images.
The higher [a.sup.*] values and the lower [L.sup.*] and [b.sup.*] values in the R1 and R4 NMCs are in agreement with a relationship among [a.sup.*] values, red fibre percentages (I-IIa MyHC isoforms) and oxyhaemoglobin
An abnormal breathing event during objectively measured sleep was defined according to the common clinical criteria of either a complete cessation of airflow lasting 10 sec (apnoea) or a discernible reduction in airflow accompanied by a decrease of 4 per cent in oxyhaemoglobin
saturation (hypopnoea).The average number of episodes of apnoea and hypopnoea per hour of sleep, the apnoea hypopnoea index (AHI) was calculated.
desaturation, ventilatory limitation and lung diffusing capacity in women during and after exercise.