Recovery of foot drop in chronic inflammatory demyelinating polyneuropathy (CIDP).

INTRODUCTION/AIMS: Foot drop is common in chronic inflammatory demyelinating polyneuropathy (CIDP), but its prognosis is uncertain. METHODS: CIDP patients with less than anti-gravity strength (<3/5 power) of ankle dorsiflexion (ADF) on Medical Research Council manual muscle testing on presentation at our center were identified by retrospective review. After initiation of standard treatment, ADF power was serially tabulated, and predictors of recovery were determined. RESULTS: Of the 27 identified patients, ADF power at presentation was <3/5 in 48/54 legs. At 1 y after treatment, ADF power improved to >/= 3/5 in 17/27 patients in one (N = 6) or both (N = 11) legs. On multi-variate analysis, predictors of recovery of ADF power were tibialis anterior compound muscle action potential amplitude at presentation, shorter disease duration, and female gender. DISCUSSION: Foot drop improves to anti-gravity power in most treated CIDP patients depending in part on the severity of fibular motor axon loss at onset of treatment.

Knowledge of Stroke, Its Warning Symptoms, Risk Factors and Treatment among the General Public and General Practitioners in a South Asian Population.

BACKGROUND: An adequate stroke literacy among the general public and first-contact physicians is an essential prerequisite to ensure timely treatment and prevention of stroke. Knowledge on stroke pathophysiology, warning symptoms, risk factors and treatment, and its determinants was assessed among general public and general practitioners (GPs) in a South Asian population. METHODS: A cross-sectional study was conducted among relatives of nonstroke patients admitted to the apex tertiary-care hospital in Sri Lanka. Trained doctors administered pretested, structured, open- and close-ended questionnaires. A postal survey using self-administered questionnaires was conducted among all registered GPs in Sri Lanka. RESULTS: The sample of general public (51.7% males; mean age = 40.7 years) from 21 of 25 districts of Sri Lanka was 840 (response-rate = 97.4%) while the sample of GPs (77.6% males; mean age = 59.63 years) was 98 (response-rate = 30%). Of the general public, 83.2% were aware of a vascular aetiology of stroke, but only 46.8% were aware that the affected organ was the brain while 67.5% believed that either the heart or limb muscles die as sequalae of stroke. Over 50% correctly identified stroke warning symptoms while 84.7% would seek immediate Western medical treatment. Approximately, 32%-46% were not aware of the major stroke risk factors. Lower education (adj. OR = 1.7; 95% CI = 1.3-2.3), absence of stroke risk factors (2.6; 1.9-3.7) and nonutility of information sources (1.5; 1.0-2.0) determined poor knowledge on risk factors. Only about 1 in 8 GPs accurately defined stroke and TIA while only 43.9% correctly classified stroke subtypes. Only 1 in 10 GPs were aware of the recommended therapeutic window for thrombolysis. Older age (P = 0.01) and longer service (P = 0.04) of GPs were associated with not requesting brain imaging in stroke. CONCLUSIONS: Strategies to educate both the public and first-contact physicians to improve stroke literacy need to be an integral part of programmes that aim to reduce the burden of stroke in any population.

Miller Fisher Syndrome Associated With Immunotherapy for Metastatic Melanoma.

Immunotherapy is a treatment strategy that has demonstrated survival benefit for metastatic melanoma. Ipilimumab and nivolumab are examples of immunotherapy, in which monoclonal antibodies antagonize cytotoxic T-lymphocyte-associated protein 4 and programmed death-ligand 1 receptors, respectively, resulting in upregulation of the host immune response to cancer cells. There is increasing recognition of immune-mediated adverse events associated with immune therapies in patients with cancer. We present a case report of a patient who developed Miller Fisher syndrome associated with these therapies for metastatic melanoma along with a discussion of its management.

Hyperpolarization-activated cyclic-nucleotide-gated channels potentially modulate axonal excitability at different thresholds.

Hyperpolarization-activated cyclic-nucleotide-gated (HCN) channels mediate differences in sensory and motor axonal excitability at different thresholds in animal models. Importantly, HCN channels are responsible for voltage-gated inward rectifying (Ih) currents activated during hyperpolarization. The Ih currents exert a crucial role in determining the resting membrane potential and have been implicated in a variety of neurological disorders, including neuropathic pain. In humans, differences in biophysical properties of motor and sensory axons at different thresholds remain to be elucidated and could provide crucial pathophysiological insights in peripheral neurological diseases. Consequently, the aim of this study was to characterize sensory and motor axonal function at different threshold. Median nerve motor and sensory axonal excitability studies were undertaken in 15 healthy subjects (45 studies in total). Tracking targets were set to 20, 40, and 60% of maximum for sensory and motor axons. Hyperpolarizing threshold electrotonus (TEh) at 90-100 ms was significantly increased in lower threshold sensory axons times (F = 11.195, P < 0.001). In motor axons, the hyperpolarizing current/threshold (I/V) gradient was significantly increased in lower threshold axons (F = 3.191, P < 0.05). The minimum I/V gradient was increased in lower threshold motor and sensory axons. In conclusion, variation in the kinetics of HCN isoforms could account for the findings in motor and sensory axons. Importantly, assessing the function of HCN channels in sensory and motor axons of different thresholds may provide insights into the pathophysiological processes underlying peripheral neurological diseases in humans, particularly focusing on the role of HCN channels with the potential of identifying novel treatment targets.NEW & NOTEWORTHY Hyperpolarization-activated cyclic-nucleotide-gated (HCN) channels, which underlie inward rectifying currents (Ih), appear to mediate differences in sensory and motor axonal properties. Inward rectifying currents are increased in lower threshold motor and sensory axons, although different HCN channel isoforms appear to underlie these changes. While faster activating HCN channels seem to underlie Ih changes in sensory axons, slower activating HCN isoforms appear to be mediating the differences in Ih conductances in motor axons of different thresholds. The differences in HCN gating properties could explain the predilection for dysfunction of sensory and motor axons in specific neurological diseases.

Septic Cavernous Sinus Thrombosis: Case Report and Review of the Literature.

Septic cavernous sinus thrombosis is a rare but serious complication of infection of the cavernous sinuses. There are no randomised, controlled trials of management of this condition and existing reviews of the literature are somewhat dated. The authors report a case with a favourable outcome and then present the findings of a literature review of the management of this condition. Outcome data suggest that corticosteroids are of equivocal benefit whereas antibiotics and anticoagulation are beneficial.

Mimics and chameleons of optic neuritis.

Optic neuritis is a common problem and most neurologists are familiar with it. Recent studies have suggested that it can be overdiagnosed in as many as 10% of cases. The major reasons for this relate to confusion regarding terminology and lack of familiarity with common mimics. This article covers typical 'idiopathic' demyelinating optic neuropathy (IDON) and several possible variations in the way it can present (chameleons). We then discuss several conditions that can mimic IDON, including neuromyelitis optica, sarcoidosis, chronic relapsing inflammatory optic neuropathy, anterior ischaemic optic neuropathy, infectious/parainfectious optic neuropathy, neuroretinitis, Leber's hereditary optic neuropathy, and some 'ocular' mimics including autoimmune retinopathy and central serous choroidoretinopathy.

Preliminary audit on early identification and management of chronic kidney disease in adults in an acute general medical unit in Sri Lanka.

This was the first round of an audit to analyze how closely the National Institute of Clinical Excellence (NICE) guidelines on early identification and management of chronic kidney disease in adults is adhered to by a medical ward in the National Hospital of Sri Lanka. One hundred consecutive patients who were not diagnosed to have chronic kidney disease (CKD) but had risk factors for future development of CKD were selected from the male and female wards of the University Medical Unit, National Hospital, Colombo, Sri Lanka. Data were collected by interviewing patients and from the case notes, and entered on a proforma designed based on the recommendations outlined in the NICE guidelines on the prevention of CKD. Target blood pressure was achieved in 66% (n=66). Urine ward test was performed only in 58% of the patients, and this was positive for protein in 15 patients. Investigations to exclude urinary tract infection were performed in 12%. Measurement of serum creatinine was carried out in 40%, but estimated glomerular filtration rate, albumin:creatinine ratio and protein:creatinine ratio were not carried out in any of the patients. Forty percent of the patients were educated by ward staff regarding CKD, 22% on risk factor modification, 23% regarding renal replacement therapy, 34% regarding dietary modifications and 67% regarding importance of exercise. Twenty-six percent of the patients were not educated on any of the above components. ACEI, ARB and statins were prescribed only in 47%, 9% and 64%, respectively. Although follow-up was indicated in all these patients, it was arranged only in 17%. The concurrence with NICE guidelines on CKD prevention was found to be poor. Strategies for improvement are discussed.

Epidemiology of chronic kidney disease in a Sri Lankan population: experience of a tertiary care center.

Chronic kidney disease (CKD) is a growing problem in Sri Lanka. Diabetes and hypertension are the main contributors to the disease burden. A new form of CKD of uncertain etiology (CKD-u) is the predominant form of CKD in certain parts of Sri Lanka, threatening to reach epidemic proportions. A cross-sectional descriptive study was carried out over a three-month period at the National Hospital of Sri Lanka to identify the underlying etiologic factors for the disease in a cohort of patients with CKD. A total of 200 patients were studied with a mean age of 50.57 years. Of them, 108 (54%) were in CKD stage V. Majority of the patients were from the western province (137, 68.5%) with only five (2.5%) from provinces with high prevalence of CKD-u. The most common underlying causes of CKD were diabetes (88, 44%) and hypertension (34, 17%). However, in patients younger than 40 years of age the most common cause was glomerulonephritis (20, 42.6%). Diabetes was the most common cause of CKD among patients from the western province (74, 54%). The prevalence of CKD-u was twice as high in patients from areas outside the western province compared with patients from this province (P > 0.05). The low prevalence of CKD-u in the study population could be the result of poor representation of patients from provinces with high prevalence of CKD-u.