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Fibromyalgia (FM) syndrome: overnight falls in arterial oxygen saturation

  [ 52 votes ]   [ Discuss This Article ]
By Alvarez Lario B, Alonso Valdivielso JL, Alegre Lopez J, Martel Soteres C, Viejo Banuelos JL, Maranon Cabello A • www.ProHealth.com • July 10, 1996


PURPOSE: Sleep alterations and muscular changes suggesting
hypoxia have been reported in fibromyalgia syndrome (FS)
pathophysiology. We tested the hypothesis that patients with
FS show falls in the oxygen saturation of hemoglobin in
arterial blood (SaO2%) during sleep.

PATIENTS AND METHODS:
Overnight SaO2% was measured by digital pulse oximetry in 28
randomly selected women who met 1990 American College of
Rheumatology criteria for the diagnosis of FS and 15 similar
controls. Considering the results of pulse oximetry and in
order to evaluate the possible presence of a sleep apnea
syndrome (SAS) as the reason for the nocturnal desaturations,
the Epworth Sleepiness Scale (ESS) was mailed to the patients
and controls. Patients and controls who had a score higher
than 10 on the ESS underwent a polysomnographic study.

RESULTS: Patients with FS showed lower overnight minimum SaO2%
(86.8 +/- 1.3 versus 90.7 +/- 0.9 in controls, P < 0.05),
greater number of desaturations (8.3 +/- 1.8 versus 2.7 +/-
0.8 in controls, P < 0.05) and more desaturations/hour (1.3
+/- versus 0.4 +/- 0.1 in controls, P < 0.05), more night
minutes in SaO2% < 92% (56.3 +/- 12.9 versus 9.1 +/- 3.8 in
controls, P < 0.01) and more minutes in SaO2% < 90% (14.7 +/-
3.7 versus 2.4 +/- 1.0 in controls, P < 0.05). There were no
differences between patients with FS and controls in ESS
scores. Five patients (19.2%) in the FS group and 2 (15.4%) in
the control group had ESS scores higher than 10. One patient
had 1 control subject showed on apnea-plus-hypopnea index
higher than 5 (13 and 9, respectively) in polysomnographic
study.

CONCLUSIONS: Patients with FS showed small overnight
falls in SaO2% and spent more time during the night in SaO2%
below 92% and 90% than did the control group. These
alterations that, as a whole, are not due to the presence of
an associated SAS could be important in FS musculoskeletal
pathophysiology.

MCM: "Pts w FS showed small overnight falls in SaO2% and spent
more time during the night in SaO2% below 92% and 90% than did
the control group. These alterations that, as a whole, are
not due to the presence of an associated sleep apnea syndrome
could be important in FS musculoskeletal pathophysiology."




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