The addition of the MEP amplitude of finger extension muscles to clinical predictors of hand function after stroke: A prospective cohort study.

BACKGROUND: Within the first 72 hours after stroke, active finger extension is a strong predictor of long-term dexterity. Transcranial magnetic stimulation may add prognostic value to clinical assessment, which is especially relevant for patients unable to follow instructions. OBJECTIVE: The current prospective cohort study aims at determining whether amplitude of motor evoked potentials of the extensor digitorum communis (EDC) can improve clinical prediction after stroke when added to clinical tests. METHODS: the amplitude of motor evoked potentials of the affected EDC muscle at rest was measured in 18 participants within 4 weeks after stroke, as were the ability to perform finger extension and the Fugl-Meyer Motor Assessment of the upper extremity (FMA_UE). These three determinants were related to the FMA_UE at 26 weeks after stroke (FMA_UE26), both directly, and via the proportional recovery prediction model. The relation between amplitude of the motor evoked potentials and FMA_UE26 was evaluated for EDC. For comparison, also the MEP amplitudes of biceps brachii and adductor digiti minimi muscles were recorded. RESULTS: Patients' ability to voluntarily extend the fingers was strongly related to FMA_UE26, in our cohort there were no false negative results for this predictor. Our data revealed that the relation between amplitude of motor evoked potential of EDC and FMA_UE26 was significant, but moderate (rs = 0.58) without added clinical value. The other tested muscles did not correlate significantly to FMA_UE26. CONCLUSIONS: Our study demonstrates no additional value of motor evoked potential amplitude of the affected EDC muscle to the clinical test of finger extension, the latter being more strongly related to FMA_UE26.

Can forearm muscle activity be selectively recorded using conventional surface EMG-electrodes in transcranial magnetic stimulation? A feasibility study.

OBJECTIVES: This feasibility study evaluates the effect of varying the position of conventional surface EMG-electrodes on the forearm when using Transcranial Magnetic Stimulation (TMS). The aim was to find optimal bipolar electrode positions for forearm extensor muscles, which would be clinically relevant to predict motor recovery after stroke. METHODS: In a healthy female subject, three rings of surface EMG-electrodes were placed around the dominant forearm, leading to 200 different electrode pairs. Both peripheral electrical stimulation and TMS were applied at suprathreshold intensities. RESULTS: With electrical stimulation of the median and radial nerve, similar waveform morphology was found for all electrode pairs, covering both flexors and extensors. Also with TMS, remarkable similarities between all electrode pairs were found, suggesting minimal selectivity. In both peripheral electrical stimulation and TMS, the curves became more irregular with decreasing inter-electrode distances. CONCLUSION: Neither with peripheral electrical stimulation nor with TMS it was possible to selectively record extensor or flexor forearm muscle activity using conventional surface EMG-electrodes. SIGNIFICANCE: Despite this negative result, the important role of the forearm extensor muscles in the prognosis of motor recovery after stroke warrants further research into novel methods for selectively recording muscle activity in TMS other than by conventional surface EMG.

Neurogenic heterotopic ossification in spinal cord injury.

Neurogenic heterotopic ossification (NHO) is a frequent complication in spinal cord injury (SCI) that is often difficult to treat. This review emphasizes the incidence, risk factors and clinical signs of NHO in SCI patients. Although the exact pathophysiology underlying NHO in neurologic patients is not yet understood, different pathogenic mechanisms have been proposed in the literature. A selection of the most important theories will be given and discussed. Moreover the different diagnostic, therapeutic, and preventive methods currently used in NHO management after SCI will be reviewed.

Treatment of upper extremity spasticity in stroke patients by focal neuronal or neuromuscular blockade: a systematic review of the literature.

Studies published from January 1966 until October 2000 on the clinical effects of focal neuronal and neuromuscular blockade in post stroke upper limb spasticity were identified. Twelve studies were included and evaluated on 13 methodological criteria. Ten studies on Botulinum toxin type A (BTX-A) treatment were found (of which 4 were randomised controlled trials (RCTs) and 6 were uncontrolled observational studies) as well as one uncontrolled observational study on phenol blockade of the subscapular muscle and one on alcohol blockade of the musculocutaneus nerve. The homogeneity of the patient groups with regard to diagnosis and their comparability with regard to functional prognosis and other sources of bias were generally unsatisfactory. Only two RCTs met predetermined criteria of minimal validity. There is evidence of effectiveness of BTX-A treatment on reducing muscle tone (varying between 0.8 and 2.0 points on the modified Ashworth scale) and improving passive range of motion at all arm-hand levels in chronic stroke patients for approximately 3-4 months. There is also preliminary evidence of a synergistic effect of concomitant electrostimulation. Taking into account a critical maximum dose of 100 MU Botox" (300-500 MU Dysport) for preserving active finger flexion, BTX-A treatment seems to be a safe focal spasmolytic treatment. Effectiveness of BTX-A treatment on improving functional abilities could not be convincingly demonstrated, although two subgroups may be identified that might specifically benefit at a functional level: (1) patients with mild spasticity and a potential for voluntary extensor activity and (2) patients with severe spasticity suffering from problems with positioning and taking care of the affected arm and hand. Larger controlled studies are needed to compare the effectiveness of BTX-A with other focal spasmolytic techniques paying special attention to individual goal assessment, the (duration of) functional benefits, co-treatment and aftercare, side-effects and cost-effectiveness.

Urinary incontinence in stroke patients after admission to a postacute inpatient rehabilitation program.

OBJECTIVE: To determine the incidence of poststroke urinary incontinence in stroke patients admitted for a postacute inpatient rehabilitation program and its association with discharge destination. DESIGN: Cohort study of first-time stroke patients admitted for a postacute inpatient rehabilitation program from August 1994 to August 1997. SETTING: Rehabilitation center in the Netherlands. PARTICIPANTS: Consecutive first-time stroke patients (n = 143). INTERVENTIONS: Not applicable. MAIN OUTCOME MEASURES: Incidence rates calculated with observation time at risk in the denominator. Measures for outcome include the Modified Barthel Index (MBI) and the discharge destination. RESULTS: The incidence rate of urinary incontinence was 29/1000 persons per month (95% confidence interval [CI], 18-48/1000 persons monthly). For incontinent patients, the mean initial MBI score +/- standard deviation was 6.0 +/- 2.3 (range, 2-12); for continent patients, it was 11.5 +/- 9.8 (range, 2-18). This difference was statistically significant (t(139) = 2.12; p = .036; 95% CI for difference of the means, .379-10.84). Patients continent at time of discharge were more often discharged to their own homes than were incontinent patients (Fisher's exact test, p = .0006). CONCLUSIONS: In this select cohort, the incidence of urinary incontinence was lower than that reported in the literature. An association was found between urinary incontinence and discharge destination and between urinary incontinence and functional ability on admission.

Osteonecrosis after treatment for heterotopic ossification in spinal cord injury with the combination of surgery, irradiation, and an NSAID.

STUDY DESIGN: Case report. OBJECTIVE: Heterotopic ossification (HO) is a frequent complication in spinal cord injury (SCI) that is often difficult to treat. Although surgery may become necessary, operative resection has been associated with complications and poor outcome due to a high recurrence rate. Additional methods of treatment to reduce the recurrence rate have been developed, including post operative irradiation and NSAIDs. This article presents three patients, who developed an osteonecrosis of the femoral head after the combined treatment for HO of surgery, irradiation, and an NSAID.