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Electrocardiographic QT interval and cardiovascular reactivity in Fibromyalgia differ from Chronic Fatigue Syndrome - Source: European Journal of Internal Medicine, May 2008]

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By Jochanan Naschitz, et al. • www.ProHealth.com • April 15, 2008


Background: Fibromyalgia (FM) and Chronic Fatigue Syndrome (CFS) frequently overlap clinically and have been considered variants of one common disorder. We have recently shown that CFS is associated with a short corrected electrocardio-graphic QT interval (QTc). In the present study, we evaluated whether FM and CFS can be distinguished by QTc.

Methods: The study groups were comprised of women with FM (n=30) and with CFS (n=28). The patients were evaluated with a 10 min supine-30 min head-up tilt test. The electrocardiographic QT interval was corrected for heart rate (HR) according to Fridericia's equation (QTc). In addition, cardiovascular reactivity was assessed based on blood pressure and HR changes and was expressed as the 'hemodynamic instability score' (HIS).

Results: The average supine QTc in FM was 417 ms (SD 25) versus 372 ms (SD 22) in CFS (p<0.0001); the supine QTc cut-off b385.7 ms was 79% sensitive and 87% specific for CFS vs. FM. The average QTc at the 10th minute of tilt was 409 ms (SD 18) in FM versus 367 ms (SD 21) in CFS (p<0.0001); the tilt QTc cut-off<383.3 ms was 71% sensitive and 91% specific for CFS vs. FM. The average HIS in FM patients was -3.52 (SD 1.96) versus +3.21 (SD 2.43) in CFS (p<0.0001).

Conclusion: A relatively short QTc and positive HIS characterize CFS patients and distinguish them from FM patients. These data may support the contention that FM and CFS are separate disorders.

Source: European Journal of Internal Medicine. May 2008; 19(3) pp. 187-191. Naschitz JE, Slobodin G, Sharif D, Fields M, Isseroff H, Sabo E, Itzhak Rosner I. Bnai Zion Medical Center and 'Rappaport Family' Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel. [E-mail: Naschitz@tx.technion.ac.il]




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