Single-photon emission computed tomography
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Single-photon emission computed tomography, abbreviated SPECT or SPET, is a nuclear medicine imaging test. It is used to obtain 3-D images of many body systems, however, the one used specifically for ME/CFS is a brain scan.
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- 1992: A study at the Department of Radiology (Division of Nuclear Medicine), University of Toronto, Canada stated: "Regional cerebral blood flow (rCBF) was assessed in 60 clinically defined CFS patients and 14 normal control (NC) subjects using 99Tcm-hexamethylpropyleneamine oxime (99Tcm-HMPAO) single photon emission computed tomography (SPECT). Compared with the NC group, the CFS group showed significantly lower cortical/cerebellar rCBF ratios, throughout multiple brain regions (P < 0.05). Forty-eight CFS subjects (80%) showed at least one or more rCBF ratios significantly less than normal values. The major cerebral regions involved were frontal (38 cases, 63%), temporal (21 cases, 35%), parietal (32 cases, 53%) and occipital lobes (23 cases, 38%). The rCBF ratios of basal ganglia (24 cases, 40%) were also reduced. 99Tcm-HMPAO brain SPECT provided objective evidence for functional impairment of the brain in the majority of the CFS subjects."
- 1994, A study at the Department of Radiology, Brigham and Women's Hospital, Boston, showed that "Patients with chronic fatigue syndrome had significantly more defects throughout the cerebral cortex on SPECT scans than did normal subjects (7.31 vs 0.43 defects per subject, p < .001). SPECT abnormalities were present in 13 (81%) of 16 patients, vs three (21%) of 14 control subjects (p < .01). SPECT scans showed significantly more abnormalities than did MR scans in patients with chronic fatigue syndrome (p < .025)."
- 1994, A study done at the Department of Medicine, Hennepin County Medical Center, Minneapolis, MN concluded: "Serum TGF-beta and cerebral blood flow abnormalities, detected by single-photon emission-computed tomographic scanning, were accentuated postexercise in the CFS group. Although these findings were not significantly different from those in the control group, the effect of exercise on serum TGF-beta and cerebral blood flow appeared magnified in the CFS patients."
- 1995, A study done at the Department of Psychiatry, UCL Medical School, London using SPET concluded: "An initial pilot study revealed widespread reduction of regional brain perfusion in 24 ME/CFS patients, compared with 24 normal volunteers." A second test was done on 67 patients with ME/CFS and that study showed: "Brain-stem hypoperfusion was confirmed in all ME/CFS patients....Patients with ME/CFS have a generalized reduction of brain perfusion, with a particular pattern of hypoperfusion of the brainstem."
- 1998: A study done at the Department of Radiology, St. Vincent's Hospital, New York, NY used eighteen patients (14 females, 4 males), who fulfilled the diagnostic criteria of the Centers for Disease Control for chronic fatigue syndrome. They concluded that: "Thirteen patients had abnormal SPET brain perfusion scans and five had normal scans."
- 2003, A study at the College of Health Sciences, University of Texas, El Paso, Texas on 15 subjects with CFS and 15 healthy persons was done twice, at rest and when performing the Paced Auditory Serial Addition Test (PASAT). Results showed: "No group differences were found for performance on the PASAT despite CFS subjects' perceptions of exerting more mental effort to perform the task than healthy subjects. Inspection of the aggregate scans by group and task suggested a pattern of diffuse regional cerebral blood flow among subjects with CFS in comparison with the more focal pattern of regional cerebral blood flow seen among healthy subjects. Between-group region-of-interest analysis revealed that although CFS subjects showed less perfusion in the anterior cingulate region, the change in CFS subjects' activation of the left anterior cingulate region during the PASAT was greater than that observed for healthy subjects. The differences were not attributable to lesser effort by the subjects with CFS, confounding effects of mood perturbation, or to poorer performance on the experimental task."
- 2006, A study at the Department of Neurosciences, Fatigue Research Center, UMDNJ-New Jersey Medical School, Newark stated: "Xenon-computed tomography blood flow studies were done on 25 CFS patients and seven healthy controls. Analyses were done after stratifying the CFS patients based on the presence or absence of a current psychiatric disorder. Flow was diminished in both groups as follows: patients with no current psychiatric disorders had reduced cortical blood flow in the distribution of both right and left middle cerebral arteries (P<0.05 for both) while those with current psychiatric disorders had reduced blood flow only in the left middle cerebral artery territory (P<0.05). These data indicate that patients with CFS have reduced absolute cortical blood flow in rather broad areas when compared with data from healthy controls and that those devoid of psychopathology had the most reductions in cortical flow. These data support, in part, our earlier findings that patients devoid of psychopathology are the group most at risk of having some of the symptoms of CFS due to brain dysfunction."
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References[edit | edit source]
- National Research Council (US) and Institute of Medicine (US) Committee on the Mathematics and Physics of Emerging Dynamic Biomedical (1996). "Chapter 5 - Single Photon Emission Computed Tomography". Mathematics and Physics of Emerging Biomedical Imaging. National Academies Press (US).
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- Carruthers, Bruce M.; Jain, Anil Kumar; De Meirleir, Kenny L.; Peterson, Daniel L.; Klimas, Nancy G.; Lerner, A. Martin; Bested, Alison C.; Flor-Henry, Pierre; Joshi, Pradip; Powles, A C Peter; Sherkey, Jeffrey A.; van de Sande, Marjorie I. (2003), "Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: Clinical Working Case Definition, Diagnostic and Treatment Protocols" (PDF), Journal of Chronic Fatigue Syndrome, 11 (2): 7-115, doi:10.1300/J092v11n01_02
- Ichise, M.; Salit, I. E.; Abbey, S. E.; Chung, D. G.; Gray, B.; Kirsh, J. C.; Freedman, M. (Oct 1992). "Assessment of regional cerebral perfusion by 99Tcm-HMPAO SPECT in chronic fatigue syndrome". Nuclear Medicine Communications. 13 (10): 767–772. ISSN 0143-3636. PMID 1491843.
- Schwartz, R. B.; Garada, B. M.; Komaroff, A. L.; Tice, H. M.; Gleit, M.; Jolesz, F. A.; Holman, B. L. (Apr 1994). "Detection of intracranial abnormalities in patients with chronic fatigue syndrome: comparison of MR imaging and SPECT". AJR. American journal of roentgenology. 162 (4): 935–941. doi:10.2214/ajr.162.4.8141020. ISSN 0361-803X. PMID 8141020.
- Peterson, P. K.; Sirr, S. A.; Grammith, F. C.; Schenck, C. H.; Pheley, A. M.; Hu, S.; Chao, C. C. (Mar 1994). "Effects of mild exercise on cytokines and cerebral blood flow in chronic fatigue syndrome patients". Clinical and Diagnostic Laboratory Immunology. 1 (2): 222–226. ISSN 1071-412X. PMID 7496949.
- Costa, D. C.; Tannock, C.; Brostoff, J. (Nov 1995). "Brainstem perfusion is impaired in chronic fatigue syndrome". QJM: monthly journal of the Association of Physicians. 88 (11): 767–773. ISSN 1460-2725. PMID 8542261.
- Abu-Judeh, H. H.; Levine, S.; Kumar, M.; el-Zeftawy, H.; Naddaf, S.; Lou, J. Q.; Abdel-Dayem, H. M. (Nov 1998). "Comparison of SPET brain perfusion and 18F-FDG brain metabolism in patients with chronic fatigue syndrome". Nuclear Medicine Communications. 19 (11): 1065–1071. ISSN 0143-3636. PMID 9861623.
- Schmaling, Karen B.; Lewis, David H.; Fiedelak, Jessica I.; Mahurin, Roderick; Buchwald, Dedra S. (Jan 2003). "Single-photon emission computerized tomography and neurocognitive function in patients with chronic fatigue syndrome". Psychosomatic Medicine. 65 (1): 129–136. ISSN 1534-7796. PMID 12554824.
- Yoshiuchi, Kazuhiro; Farkas, Jeffrey; Natelson, Benjamin H. (Mar 2006). "Patients with chronic fatigue syndrome have reduced absolute cortical blood flow". Clinical Physiology and Functional Imaging. 26 (2): 83–86. doi:10.1111/j.1475-097X.2006.00649.x. ISSN 1475-0961. PMID 16494597.