Exploring the Role of Neuromuscular Electrical Stimulation in Neonatal Brachial Plexus Palsy: A Narrative Review of Motor Recovery and Functional Outcomes

Objective: To provide an overview of the muscle weakness development in intensive care units (ICU), summarize clinical trials on the role of neuromuscular electrical stimulation for muscle weakness rehabilitation in ICU and highlight recent strategies that may prevent or minimize this condition.Methodology: Literature review. Results: Some recent studies have shown that an increasing number of survivors of critical illness develop significant functional impairment; one of the common impairments being ICU acquired muscle weakness. Prolonged immobilization and mechanical ventilation likely contribute to the development of ICU-acquired weakness. Several novel therapeutic strategies have been used to overcome the impairment, including neuromuscular electrical stimulation. This neuromuscular electrical stimulation, a kind of physical therapy, is known to stimulate the nerves and thus increase muscle contraction. Conclusion: Neuromuscular electrical stimulation for rehabilitation in ICU-related muscle weakness has shown some promise, but more efforts are needed to detect the development of ICU-acquired weakness as early as possible and rigorously evaluate novel rehabilitation interventions.Abbreviations: ICU (Intensive Care Unit); ICU-Acquired Weakness (ICU-AW); CIP (Critical Illness Polyneuropathy); CIM (Critical Illness Myopathy), CIPM (Critical Illness Polyneuropathy and Myopathy)Citation: Kusumawardani MK, Poerwandari D, Narasinta I, Hidayati HB, Subadi I. The role of neuromuscular electrical stimulation for rehabilitation in ICU acquired weakness. Anaesth Pain & Intensive Care 2018;22 Suppl 1:S164-S169

Randomized controlled trials (RCT) were carried out to investigate the role of neuromuscular electrical stimulation (NMES) in patients with chronic obstructive pulmonary disease (COPD). However, these studies have small sample size and different measures for evaluating outcomes, and convey inconclusive results. We carried out a meta-analysis to assess the effects of NMES to COPD patients. A computerized search was performed through PubMed and Embase databases (up to December 2012) for relevant RCT. Two investigators independently screened the articles. The primary outcome measures were quadriceps strength and exercise capacity, secondary outcomes included dyspnoea and muscle fibre characteristics. The weighted mean difference (WMD) or standardized mean difference and the 95% confidence interval (CI) were calculated, and the heterogeneity was assessed with the I(2) test. Eight trials involving 156 patients were included in this meta-analysis. We found that NMES was not associated with significant changes in quadriceps strength (standardized mean difference 0.38; 95% CI: -0.13-0.89) nor 6 min walk distance (WMD 13.63 m; 95% CI: -17.39-44.65). NMES failed to improve the muscle fibre characteristics (type I: WMD 1.09%; 95% CI: -19.45-21.64; type IIa: WMD -7.50%; 95% CI: -19.81-4.81). NMES significantly improved dyspnoea (WMD -0.98 scores; 95% CI: -1.42- -0.54). Evidence to support the benefits of NMES to COPD patients is currently inadequate. Larger-scale studies are needed to investigate the efficacy of NMES.

Objective: This study aimed to investigate the role of neuromuscular electrical stimulation (NMES) in increasing femoral venous blood flow after total hip prosthesis and to evaluate its potential effects on preventing postoperative deep vein thrombosis (DVT).Materials and methods: A total of 64 patients who underwent total hip prosthesis were randomly separated into two groups. The NMES group (n=32) received low-molecular-weight heparin+NMES. And the non-NMES group (n=32) received a low-molecular-weight heparin+compression bandage.Results: There was no difference between the groups in terms of the presence of preoperative and postoperative leg edema. The calf diameter was significantly lower in the NMES group than in the non-NMES group in both the preoperative (p=0.003) and postoperative (p=0.008) period. Although the femoral vein peak velocity (VPV) was similar between the groups in the preoperative period, it was significantly higher in the NMES group than in the non-NMES group postoperatively (p=0.001). The femoral VPV after total hip prosthesis increased more in the NMES group (43.2%) compared with the non-NMES group (16.3%). In the non-NMES group, the D-dimer value in the preoperative period was lower than on postoperative days one and five (p<0.05). There was no significant difference between the D-dimer values on postoperative days one and five. In the NMES group, a statistically significant difference was determined between the preoperative and postoperative test results (F(2.93)=20.86, p=0.001). The preoperative D-dimer values were compared to the postoperative values on the first and fifth day, and according to the post hoc test results, the D-dimer values were significantly lower on the fifth postoperative day than on the first postoperative day, and the preoperative value was significantly lower than the fifth postoperative day value (p<0.05). Conclusion: Although the two groups were similar in terms of leg edema, there was a significant increase in femoral VPV in the NMES group. This could indicate a potential effect of NMES in preventing postoperative DVT and needs to be confirmed with further studies.

Objective: To assess the effectiveness of surface neuromuscular electrical stimulation in the treatment of knee osteoarthritis. Design: Systematic review and meta-analysis of randomized controlled and controlled clinical trials Methods: Studies were identified from databases (MEDLINE, EMBASE, CINAHL, Sports Discus, PEDro and the Cochrane Library) searched to January 2011 using a battery of keywords. Two reviewers selected studies meeting inclusion criteria. The methodological quality of the included studies was assessed using the Thomas Test and the strength of the evidence was then graded using the Agency for Health Care Policy and Research guidelines. Data were pooled and meta-analyses were performed. Results: Nine randomized controlled trials and one controlled clinical trial, studying a total of 409 participants (n = 395 for randomized controlled trials, and n = 14 for controlled trial) with a diagnosis of osteoarthritis were included. Inconsistent evidence (level D) was found that neuromuscular electrical stimulation has a significant impact on measures of pain, function and quadriceps femoris muscle strength in knee osteoarthritis. Conclusion: The role of neuromuscular electrical stimulation in the treatment of knee osteoarthritis is ambiguous. Therefore, future work is needed in this field to clearly establish the role of neuromuscular electrical stimulation in this population.

Neuromuscular electrical stimulation (NMES) of leg muscles has been introduced in clinical practice as a rehabilitation (RHB) method in patients with chronic heart failure (CHF); however, the role of NMES on the reduction of arterial stiffness and autonomic disbalance in these patients has not yet been studied. Sixty-one patients with stable CHF (mean age 58.9 [2.1] years; mean ejection fraction 31 [4.2]%, New York Heart Association II-III) were randomly assigned into two groups. Patients in (i) exercise training group (ET; n = 30) underwent 12 weeks of bicycle ET (3 × 40 min/week); (ii) group NMES (n = 31) performed 12 weeks of NMES of quadriceps and calf muscles (frequency 10 Hz, mode "20 s on-20 s off," intensity 60 mA), 2 × 60 min/day. Noninvasive assessment of arterial stiffness was done using the cardio-ankle vascular index (CAVI). CAVI and heart rate variability (HRV) and ·VO(2peak) were evaluated before and after RHB program. Both types of RHB reduced significantly CAVI (ET from 9.6 [0.2] to 8.9 [0.2], P < 0.012; NMES from 9.3 [0.2] to 8.7 [0.2], P < 0.013), increased high frequency (HF) component of HRV (+65.6%; P = 0.001) and decreased ratio of low frequency (LF) component with HF component (LF/HF ratio) in group ET (-39.8%; P < 0.001). Changes of HRV parameters in group NMES were not significant; however, a marked tendency to autonomic stabilization was present. Both types of RHB led also to significant increase of ·VO(2peak) (ET from 18.7 [0.7] to 20.8 [0.7] mL/kg/min, P < 0.004; NMES from 17.3 [0.7] to 19.0 [0.7] mL/kg/min, P < 0.001). ET or NMES has been shown to improve significantly arterial stiffness and to stabilize autonomic balance.

Neonatal brachial plexus palsy (NBPP) is a flaccid paralysis of the upper limbs that occurs in about 0.4 percent of live births. This condition can produce permanent disabilities; to date, there is no consensus on protocols to be applied for the rehabilitation of children with this condition. The aim of this article is to provide a concise overview of conservative treatment beyond traditional physical therapy for the management of the child with NBPP and to offer a number of useful options for creating the most comprehensive and functional rehabilitation treatment possible. We conducted a narrative review after analyzing articles from the past 50 years on PubMed, Cochrane Library, Scopus, and Web of Science with the following search string [("neonatal brachial plexus palsy" OR "obstetric brachial plexus palsy" OR "birth brachial plexus palsy") AND ("rehabilitation" OR "physiotherapy" OR "conservative treatment")]. We identified a potential of 1275 articles, but only 11 were exclusively about conservative approaches. The most represented rehabilitation approaches in the literature were botulinum toxin, constraint-induced movement therapy (CIMT), virtual reality, neuromuscular electrical stimulation, and kinesiotaping. In conclusion, the various rehabilitation approaches for NBPP are promising, but none can be considered the best option when used alone. In light of the current evidence, a multimodal approach is needed.

Varicose vein is one of the common vascular abnormalities in the world. Patients with varicose veins are at high risk for developing deep vein thrombosis. Various physiotherapy modalities such as muscle stimulator, pneumatic compression, ultrasonic, TENS can help in the management of pain and Improves quality of life in these patients. Various studies have supported that neuromuscular electrical stimulation (NMES) could improve pain and quality of life (QOL) in patients with varicose vein. Purpose of this review is to know about the role of NMES in the management of varicose vein. Several studies showed that NMES helps in decreasing pain and improves QOL in patients with varicose vein. Till date there is no definitive protocol for NMES as treatment modality in varicose vein patients. In order to establish a definitive protocol in varicose vein, further research needs to be conducted. Keywords: Neuromuscular Electrical Stimulation (NMES), TENS, varicose vein

Invited Commentary on: ‘Advances in neuromuscular electrical stimulation for the upper limb post stroke’, Hayward et al. Hayward et al.’s review paper summarizes the current applications of neuromuscular electrical stimulation (NMES) and the treatment effects of different types of NMES in the impairment, activity, and participation domains of International Classification of Functioning, Disability and Health model for stroke patients. In addition, they suggested future research directions for NMES research. We would like to remind readers that there is another important question for future research, i.e. the influence of NMES parameters (stimulation time, intensity, treatment duration, and target muscles) on affected upper limb recovery post-stroke. It has been suggested that parameters of electrical stimulation are likely to be crucial factors related to treatment effect. Owing to the heterogeneity of NMES parameters adopted in the articles reviewed in the current study, the readers must be cautious while applying the results from this study to their individual patients. According to motor learning theories, repetition is important for improving movement performance. Hence, it is reasonable to assume that there might be a positive relationship between number of practice trials and motor performance improvement. Previous studies have demonstrated that increasing exercise time led to better functional outcomes. Can we apply this principle for NMES treatment? Will higher doses of NMES lead to better arm function recovery than lower doses of NMES? What is the optimal treatment dose for selected NMES to improve impairment or function of the upper limb after stroke? The answers to these questions remain ambiguous because the stimulation doses of NMES ranged widely from as little as a total of 6 hours to more than 200 hours among studies. The minimal effective dose for improving upper limb function from our own study was 10 hours. Our study revealed that dosage of NMES was a significant predictor for upper limb function improvement and increasing the stimulation dose of NMES led to greater improvement in the action research arm test score at follow-up. Another important issue in NMES application is the influence of selection of target muscles. de Kroon et al.’s study showed that there was no significant difference between alternating stimulation of the hand extensor and flexor muscles or stimulation hand extensors only. Our study found that patients who received stimulation of both hand flexor and extensor muscles showed greater improvement as compared with those receiving stimulation of extensor muscles. Furthermore, de Kroon et al.’s review paper reported an increased likelihood of a positive outcome if elbow and shoulder muscles were stimulated in addition to wrist and/or finger extensors. The relationship between stimulated target muscles and arm function remains unclear based on current available evidences. Hayward et al. suggested that more studies are needed to investigate effects of NMES on patients with severe paresis or paralysis in acute stage. This could provide more information for clinicians regarding which stroke patients will benefit from NMES intervention or is suitable for which types of NMES. Some studies supported the treatment effect of NMES in the acute phase; however, few studies have applied NMES in patients with severe paresis. Our own experience indicated that cyclic NMES can be applied to patients in the acute flaccid stage or to patients with severe arm weakness with satisfactory results on both the impairment and the function levels. NMES is a useful adjunct therapy for stroke rehabilitation during both acute and chronic stages. The current review paper provided an overview of current and emerging NMES applications. It offers a good overview for clinicians to select appropriate NMES techniques for improving either the impairment or function of upper limb after stroke. For future studies, we hope that more information on the influence of NMES parameters on affected upper limb recovery can be provided.

Weight loss/weight control is a major concern in prevention of cardiovascular disease and the realm of health promotion. The primary aim of this study was to investigate the effect of neuromuscular electrical stimulation (NMES) at different intensities on energy expenditure (oxygen and calories) in healthy adults. The secondary aim was to develop a generalized linear regression (GEE) model to predict the increase of energy expenditure facilitated by NMES and identify factors (NMES stimulation intensity level, age, body mass index, weight, body fat percentage, waist/hip ratio, and gender) associated with this NMES-induced increase of energy expenditure. Forty sedentary healthy adults (18 males and 22 females) participated. NMES was given at the following stimulation intensities for 10 minutes each: sensory level (E1), motor threshold (E2), and maximal intensity comfortably tolerated (E3). Cardiopulmonary gas exchange was evaluated during rest, NMES, and recovery stage. The results revealed that NMES at E2 and E3 significantly increased energy expenditure and the energy expenditure at recovery stage was still significantly higher than baseline. The GEE model demonstrated that a linear dose-response relationship existed between the stimulation intensity and the increase of energy expenditure. No subject’s demographic or anthropometric characteristics tested were significantly associated with the increase of energy expenditure. This study suggested NMES may be used to serve as an additional intervention for weight loss programs. Future studies to develop electrical stimulators or stimulation electrodes to maximize the comfort of NMES are recommended.

Object Neonatal brachial plexus palsy (NBPP) affects 0.4-2.6 newborns per 1000 live births in the US. Many infants recover spontaneously, but for those without spontaneous recovery, nerve and/or secondary musculoskeletal reconstruction can restore function to the affected arm. This condition not only manifests in a paretic/paralyzed arm, but also affects the overall health and psychosocial condition of the children and their parents. Currently, measurement instruments for NBPP focus primarily on physical ability, with limited information regarding the effect of the disablement on activities of daily living and the child's psychosocial well-being. It is also difficult to assess and compare overall treatment efficacy among medical (conservative) or surgical management strategies without consistent use of evaluation instruments. The purpose of this study is to review the reported measurement evaluation methods for NBPP in an attempt to provide recommendations for future measurement usage and development. Methods The authors systematically reviewed the literature published between January 1980 and February 2012 using multiple databases to search the keywords "brachial plexus" and "obstetric" or "pediatrics" or "neonatal" or "congenital." Original articles with primary patient outcomes were included in the data summary. Four types of evaluation methods (classification, diagnostics, physical assessment, and functional outcome) were distinguished among treatment management groups. Descriptive statistics and 1-way ANOVA were applied to compare the data summaries among specific groups. Results Of 2836 articles initially identified, 307 were included in the analysis, with 198 articles (9646 patients) reporting results after surgical treatment, 70 articles (4434 patients) reporting results after medical treatment, and 39 articles (4247 patients) reporting results after combined surgical and medical treatment. Among medical practitioners who treat NBPP, there was equivalence in usage of classification, diagnostic, and physical assessment tools (that focused on the Body Function and Structures measure of the International Classification of Functioning, Disability, and Health [ICF]). However, there was discordance in the functional outcome measures that focus on ICF levels of Activity and Participation. Of the 126 reported evaluation methods, only a few (the Active Movement Scale, Toronto Scale Score, Mallet Scale, Assisting Hand Assessment, and Pediatric Outcomes Data Collection Instrument) are specifically validated for evaluating the NBPP population. Conclusions In this review, the authors demonstrate disparities in the use of NBPP evaluation instruments in the current literature. Additionally, valid and reliable evaluation instruments specifically for the NBPP population are significantly lacking, manifesting in difficulties with evaluating the overall impact and effectiveness of clinical treatments in a consistent and comparative manner, extending across the various subspecialties that are involved in the treatment of patients with NBPP. The authors suggest that all ICF domains should be considered, and future efforts should include consideration of spontaneous (not practitioner-elicited) use of the affected arm in activities of daily living with attention to the psychosocial impact of the disablement.

Bell's palsy is an idiopathic, unilateral facial paralysis, caused by a malfunction anywhere along the facial nerve's peripheral portion, from the pons distally. Bell's palsy is treated by removing the cause of nerve injury, strengthening the face muscles, and restoring facial function. Physical therapy in the form of neuromuscular electrical stimulation (NMES), massage and facial exercises is used as adjuvant to hasten recovery. The aim of this study is to access of role of neuromuscular electrical stimulation (NMES) treatment in Bell’s palsy patients. A detailed neurological assessment of three patients was done with emphasis on facial muscles and severity of paralysis was graded according to House Brackmann scale (HBS). Conventional physiotherapy was given in the form of electrical stimulation, facial massage, exercises and functional re-education on a daily basis. Patients were assessed at weekly and 1months after the treatment. They experienced complete recovery within 1month follow-up, no recurrence was observed and all patients have normal facial movement. Physiotherapy in the form of NMES and facial exercises has a effective role in the early management of Bell’s palsy. Keywords: Bell’s palsy; neuromuscular electrical stimulation; House Brackmann scale; physiotherapy.

P1. Improvement of motor function induced by skeletal muscle contraction in spinal cord injury rats

A reappraisal of the strength-duration test to assess neuromuscular impairment of critically ill patients

Early referral of neonatal brachial plexus palsy (NBPP) patients to multidisciplinary clinics is critical for timely diagnosis, treatment, and improved functional outcomes. In Saudi Arabia, inadequate knowledge regarding NBPP is a reason for delayed referral. We aimed to evaluate the knowledge of North American healthcare providers (HCPs) regarding the diagnosis, management, and prognosis of NBPP. A 12-question survey regarding NBPP was distributed via electronic and paper formats to North American providers from various referring and treating specialties. NBPP knowledge was compared between Saudi Arabian vs. North American providers, referring vs. treating specialties, academic vs. community hospitals, and providers with self-reported confidence vs. nonconfidence in NBPP knowledge. Of the 273 surveys collected, 45% were from referring providers and 55% were from treating providers. Saudi Arabian and North American HCPs demonstrated similar NBPP knowledge except for potential etiologies for NBPP and surgery timing. In North America, referring and treating providers had similar overall knowledge of NBPP but lacked familiarity with its natural history. A knowledge gap existed between academic and community hospitals regarding timing of referral/initiation of physical/occupational therapy (PT/OT) and Horner's syndrome. Providers with self-reported confidence in treating NBPP had greater knowledge of types of NBPP and timing for PT/OT initiation. Overall, North American providers demonstrated adequate knowledge of NBPP. However, both eastern and western physicians remain overly optimistic in believing that most infants recover spontaneously. This study revealed a unique and universal knowledge gap in NBPP diagnosis, referral, and management worldwide. Continuous efforts to increase NBPP knowledge are indicated.

Objective: The aim of this study was to evaluate the role of neuromuscular electrical stimulation (NMES) in tube-fed patients with severe and chronic dysphagia refractory to traditional swallowing therapy (TT). Patients and Methods: A total of 11 consecutive dysphagic patients with tube-dependent nutrition and who had not responded to 6 months of TT were enrolled. Each patient received NMES for 30 min and TT for 30 min, twice a day, 5 days per week for 4 weeks. In order to evaluate the swallowing impairment, each patient underwent a fiberoptic endoscopic examination of swallowing immediately before the beginning of the treatment, after 2 weeks and after 4 weeks. Results: All enrolled patients managed to complete the swallowing treatment protocol for at least 2 weeks. After the 4-week treatment, 6 of 11 enrolled patients passed to a total oral diet with single or multiple consistencies despite specific food limitations or special preparation or compensation. Five patients, all affected by the most severe form of dysphagia, maintained tube-dependent nutrition. Conclusion: NMES as adjunctive treatment to TT may offer a new possibility for the management of tube-fed patients who are refractory to TT.