External pneumatic compression device prevents fainting in standing weight-bearing MRI: a cohort study
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To investigate if a peristaltic external pneumatic compression device attached to the legs, while scanning, can reduce a substantial risk of fainting in standing weight-bearing magnetic resonance imaging (MRI).
Materials and methods
This study comprised all patients with low back pain referred to standing MRI of the lumbar spine, using a 0.25-T open G-Scanner, from June 2011 to April 2012. The standing MRI protocol included a sagittal TSE T2w and an axial GRE T2w sequence giving a total scan time of 17 min. The first patients were scanned standing without a device (control group), and then from January to April 2012 the patients were scanned in the standing position using an external pneumatic compression device, attached to the legs (experimental group).
One hundred and forty-nine patients (mean age 42.5, standard deviation 12.5, and range 20–77 years) were included and scanned standing. No significant difference in age (p = 0.51) or gender (p = 0.47) was observed between the control group (n = 86) and the experimental group (n = 63). Sixteen patients (19 %) fainted in the control group during the standing MRI scan, compared to one patient (2 %) in the experimental group where the pneumatic compression device was applied. The difference between groups was highly significant (p = 0.001; Fisher’s exact test), with an OR = 0.071 (exact 95 % CI: 0.002 to 0.486) for the pneumatic compression device.
A substantial risk of fainting during standing MRI was almost eliminated by using an external peristaltic pneumatic compression device.
KeywordsSyncope Fainting Weight bearing Magnetic resonance imaging Adverse effects
The Oak Foundation, Copenhagen University Hospital, Bispebjerg and Frederiksberg, Savværksejer Jeppe Juhl og Hustru Ovita Juhls Mindelegat, Minister Erna Hamiltons Legat for Videnskab og Kunst and the Danish Rheumatism Association all provided funding for this project. ArjoHuntleigh Geting Group provided the pump device (Huntleigh Flowtron Excel DVT Pump, Bedfordshire, UK), which are originally made and approved to prevent deep vein thrombosis (DVT). No benefits in any form have been or will be received from a commercial party related directly or indirectly to the subject of this manuscript.
Conflict of interest
The authors declare that they have no conflicts of interest.
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