Deteriorating tactile sensation in patients with hand syndromes associated with diabetes: a two-year observational study

Diabetic Neuropathy in Hands: An Endemic Complication Waiting to Unfold?

In this cross-sectional study we aimed to quantify the somatosensory dysfunction in the hand in people with diabetes with distal symmetrical polyneuropathy (DSPN) in hands and explore early signs of nerve dysfunction in people with diabetes without DSPN in hands. The clinical diagnosis of DSPN was confirmed with electrodiagnosis and corneal confocal microscopy. Thermal and mechanical nerve function in the hand was assessed with quantitative sensory tests. Measurements were compared between healthy participants (n = 31), individuals with diabetes without DSPN (n = 35), individuals with DSPN in feet but not hands (DSPNFEET ONLY) (n = 31), and individuals with DSPN in hands and feet (DSPNHANDS & FEET) (n = 28) with one-way between-group ANOVA. The somatosensory profile of the hand in people with DSPNHANDS & FEET showed widespread loss of thermal and mechanical detection. This profile in hands is comparable with the profile in the feet of people with DSPN in feet. Remarkably, individuals with DSPNFEET ONLY already showed a similar profile of widespread loss of nerve function in their hands. People with diabetes without DSPN in feet already had some nerve dysfunction in their hands. These findings suggest that nerve function assessment in hands should become more routine in people with diabetes.

Diabetic neuropathy is a generalized phenomenon with impact on hand functional performance and quality of life

BACKGROUND

Diabetic sensorimotor peripheral neuropathy (DSPN) is usually considered to affect predominantly the lower limbs (LL-N), while the impact of upper limb neuropathy (UL-N) on hand functional performance and quality of life (QoL) has not been evaluated systematically. This study aims to investigate the prevalence and characteristics of UL-N and its functional and psychosocial consequences in type 2 diabetes.

METHODS

Individuals with type 2 diabetes (n=141) and an age- and sex-matched control group (n=73) underwent comprehensive assessment of neuropathy, hand functional performance and psychosocial status.

RESULTS

The prevalence of UL-N was 30.5% in patients with diabetes and that of LL-N 49.6%, with 25.5% exhibiting both. Patients with diabetes showed similar sensory phenotype regarding both large and small fiber functions in hands and feet. Patients with UL-N showed reduced manual dexterity, but normal hand grip force. Additionally, there was a correlation between reduced dexterity and sensory deficits. Patients with UL-N had reduced estimates of psychosocial health including health-related QoL compared to control subjects and patients without UL-N. UL-N correlated with the severity of LL-N, but not with duration of diabetes, glycaemia, age, or sex.

CONCLUSIONS

This study points to a substantial prevalence of UL-N in type 2 diabetes. The sensory phenotype of patients with UL-N was similar to LL-N and was characterized by loss of sensory function. Our study demonstrated an association of UL-N with impaired manual dexterity and reduced health-related QoL. Thus, upper limb sensorimotor functions should be assessed early in patients with diabetes.

Dynamical Coordination of Hand Intrinsic Muscles for Precision Grip in Diabetes Mellitus

This study investigated the effects of diabetes mellitus (DM) on dynamical coordination of hand intrinsic muscles during precision grip. Precision grip was tested using a custom designed apparatus with stable and unstable loads, during which the surface electromyographic (sEMG) signals of the abductor pollicis brevis (APB) and first dorsal interosseous (FDI) were recorded simultaneously. Recurrence quantification analysis (RQA) was applied to quantify the dynamical structure of sEMG signals of the APB and FDI; and cross recurrence quantification analysis (CRQA) was used to assess the intermuscular coupling between the two intrinsic muscles. This study revealed that the DM altered the dynamical structure of muscle activation for the FDI and the dynamical intermuscular coordination between the APB and FDI during precision grip. A reinforced feedforward mechanism that compensates the loss of sensory feedbacks in DM may be responsible for the stronger intermuscular coupling between the APB and FDI muscles. Sensory deficits in DM remarkably decreased the capacity of online motor adjustment based on sensory feedback, rendering a lower adaptability to the uncertainty of environment. This study shed light on inherent dynamical properties underlying the intrinsic muscle activation and intermuscular coordination for precision grip and the effects of DM on hand sensorimotor function.

Peripheral neuropathy in the hands of people with diabetes mellitus

AIMS

Peripheral sensorimotor neuropathy is a recognised complication of diabetes mellitus however little attention has been given to its development in the hands. The aim of this study was to determine the prevalence of sensory impairment in the hands of participants with diabetes, the agreement between two measurement tools for assessing sensation and the association between hand sensibility, age, glycaemic control and end-organ damage.

METHODS

A total of 162 participants were recruited and divided into two cohorts based on a diagnosis of diabetes. Participants were tested for the presence of hand neuropathy using Semmes-Weinstein monofilaments and the AsTex™. Medical records of participants with diabetes were accessed retrospectively to determine glycaemic control and diabetes complications.

RESULTS

A highly statistically significant association was found between neuropathy and diabetes status (P<0.001) on monofilament testing. The prevalence of neuropathy was 64% compared to ∼10% amongst participants without diabetes. Age, male gender and diabetic retinopathy were associated with neuropathy. The AsTex™ identified participants with diminished protective sensation on monofilament testing.

CONCLUSIONS

This study demonstrates a relationship between diabetes and upper limb neuropathy. Age, male gender and retinopathy were associated with diminished hand sensation. The AsTex™ may have a role as a screening tool for identifying clinically significant hand neuropathy.

Modelling of diabetes knowledge, attitudes, self-management, and quality of life: a cross-sectional study with an Australian sample

BACKGROUND

Quality of life (QoL) is an important aspect of wellbeing for people with chronic conditions like type 2 diabetes, making it a noteworthy outcome. Knowledge about diabetes, attitudes, and self-management of diabetes are key factors that might directly or indirectly impact QoL. However, little is known about the inter-relationships between diabetes knowledge, attitudes, self-management and QoL among people with type 2 diabetes mellitus (T2DM). The aim of this study was to examine a model describing the relationship between diabetes knowledge, attitudes, self-management, and QoL of people with T2DM that is based on previous research linking pairs of these variables.

METHODS

A cross-sectional study design was employed in this research. A total of 291 participants, 192 males and 99 females, with T2DM, whose mean age was 55.8 (standard deviation = 11.09) completed questionnaires measuring diabetes knowledge (Diabetes Knowledge Scale), attitudes (Diabetes Integration Scale -19), self-management (Summary of Diabetes Self-care Activities Scale), including the aspects of diet, exercise, blood glucose testing, and foot care, and QoL (Diabetes Quality of Life Scale), comprising the aspects of satisfaction and impact on QoL respectively. To examine the model we proposed relating these variables, data were analysed using the path analysis.

RESULTS

In the final model, diabetes knowledge was a significant predictor for attitudes and self-management in terms of blood glucose testing. Attitudes was a significant predictor for self-management in terms of diet. In addition, self-management in terms of blood glucose testing was a significant predictor of impact of QoL, and self-management in terms of diet was a significant predictor of satisfaction and impact of QoL. Self-management in terms of exercise was a significant predictor of satisfaction in QoL. The final model reflected a good fit (χ(2) (14) = 22.52, p = 0.069; CFI = 0.983; GFI = 0.983; RMSEA = 0.046).

CONCLUSIONS

Diabetes knowledge, attitudes, and self-management are important factors that can impact the QoL among people with type 2 diabetes.

Usability of assistive listening devices by older adults with low vision

PURPOSE

This study examines the performance of individuals with both hearing and vision loss when using assistive listening devices.

METHODS

Older adults (age 60-100) with low vision only (n = 23), combined vision and hearing loss (n = 25) and a control group (n = 12) were asked to assemble a pocket talker, and operate a talking clock and an amplified telephone. They either received minimal or no instruction. Success at using the devices properly, as well as performance speed, was recorded.

RESULTS

The proportion of individuals with sensory loss that was able to complete our naturalistic tasks without mistakes ranged from 20% to 95%, depending on the device, the task complexity and the instruction provided. Both instruction as well as simple repetition had statistically significant and separate beneficial effects; however, neither was able to bring success to 100% on any device. Speed and task success were linked in an intuitive way, whereby individuals who succeeded at a task also performed it faster.

CONCLUSIONS

Even minimal explanation during the introduction of assistive listening devices to persons with low vision facilitates user success. Device visibility, cognitive and motor complexity of the task, as well as manual dexterity warrant further investigation as potential barriers to device use. Implications for Rehabilitation Hearing rehabilitation with individuals affected by vision loss requires additional attention and time to accommodate challenges with visibility and task complexity. Even minimal rehabilitation interventions can improve success and speed of device use. Repetition (practice) and instruction (strategy) have independent beneficial effects on device use. Dexterity, visibility, hand-eye-coordination, task complexity and cognitive ability need to be considered when assigning assistive devices for older adults with vision and/or hearing loss.

Impacts of elevated glycaemic haemoglobin and disease duration on the sensorimotor control of hands in diabetes patients

BACKGROUND

To understand the impacts of disease chronicity and hyperglycaemia on sensorimotor control of hands of diabetic patients, this study investigated the differences in hand sensation, strength and motor control by applying the pinch-holding-up activity test for patients with diabetes mellitus (DM) with different levels of glycaemic control and disease chronicity.

METHODS

One hundred and fifty-nine patients with clinically defined DM were included. Semmes-Weinstein monofilament, static two-point discrimination and moving two-point discrimination, maximal pinch strength precision pinch performance tests and nerve conduction studies (NCS) of the subjects were carried out. Forty-seven (29.6%) patients were in the HbA(1c) < 7% category, and 112 (70.4%) patients were in the >7% group. There were 87 (54.7%) patients with the disease duration <10 years, and 72 (45.3%) patients with disease duration ≧10 years.

RESULTS

The severity of hyperglycaemia significantly impacts the results for Semmes-Weinstein monofilament, precision pinch force control, sensory and motor NCS tests (p < 0.05). In addition, the chronicity of disease influences the motor control of precision pinch performance and the amplitude of motor NCS (p < 0.05) for the diabetes patients.

CONCLUSIONS

The evidence suggests that disease chronicity and hyperglycaemia have impacts on sensorimotor control in the hands of DM patients. In addition, the efficiency of prehensile forces of hand-to-object interactions in the pinch-holding-up activity test could be significant for identifying hand function, as well as pathologic changes in median nerve function, for patients with DM.

Health-related quality of life 5 years after carpal tunnel release among patients with diabetes: a prospective study with matched controls

BACKGROUND

Carpal tunnel syndrome (CTS) is the most common entrapment neuropathy encountered in diabetes. The short-term improvement after carpal tunnel release has previously been demonstrated not to differ between patients with and without diabetes, despite a marked impairment in health-related quality of life (HRQL) among the former. In this study, we compare HRQL 5 years after carpal tunnel release between these two groups of patients.

METHODS

In a prospective series, 35 patients with diabetes and CTS were matched with 31 control patients with idiopathic CTS but no diabetes. At the 5-year follow-up patients completed the Medical Outcomes Short-Form 36 (SF-36) and Antonovsky's sense of coherence (SOC) questionnaire. Differences in changes over time were compared between patients with and without diabetes using mixed model analysis.

RESULTS

Although patients with diabetes reported a significant decrease in physical functioning (p =0.004) as compared to patients without diabetes, postoperative improvement was maintained in the physical domains, role physical and bodily pain. A more pronounced decline in the mental health domain, social function (p =0.03), was demonstrated among patients with diabetes. There was no evidence of any difference in SOC between the patient groups.

CONCLUSION

Patients with diabetes retained their improvement in physical domains sensitive to changes after carpal tunnel release in the long-term, despite a decline in other domains of both physical and mental HRQL. This differed from patients without diabetes. Differences in SOC could not explain the sharper decline in these domains among patients with diabetes.

Upper extremity impairments, pain and disability in patients with diabetes mellitus

OBJECTIVES

To determine the severity of, and relationships between, upper extremity impairments, pain and disability in patients with diabetes mellitus, and to compare upper extremity impairments in patients with diabetes with non-diabetic controls.

DESIGN

Case-control, cross-sectional design.

SETTING

University-based, outpatient diabetes centre and physical therapy research clinic.

PARTICIPANTS

Two hundred and thirty-six patients with diabetes attending an outpatient diabetes clinic completed the Shoulder Pain and Disability Index (SPADI) questionnaire. A detailed shoulder and hand examination was conducted on a subgroup of 29 volunteers with type 2 diabetes, and 27 controls matched for age, sex and body mass index.

INTERVENTIONS

None.

MAIN OUTCOME MEASURES

SPADI score, passive shoulder range of motion (ROM) and strength, grip strength, hand sensation, dexterity and limited joint mobility of the hand.

RESULTS

Sixty-three percent (149/236) of patients with diabetes reported shoulder pain and/or disability [median SPADI score 10.0 (interquartile range 0.0 to 39.6)]. Compared with the control group, the subgroup of patients with diabetes had substantial reductions in shoulder ROM, shoulder muscle strength, grip and key pinch strength (P<0.05). Patients with diabetes had a greater prevalence of decreased sensation (26/27 vs 14/27) and limited joint mobility of the hand (17/27 vs 4/27) compared with the control group. Total SPADI score was negatively correlated (P<0.05) with shoulder ROM (r=-0.42 to -0.74) and strength measures (r=-0.44 to -0.63) in patients with diabetes.

CONCLUSIONS

Upper extremity impairments in this sample of patients with diabetes were common, severe and related to complaints of pain and disability. Additional research is needed to understand the unique reasons for upper extremity problems in patients with diabetes, and to identify preventative treatments.

The associations among hand dexterity, functional performance, and quality of life in diabetic patients with neuropathic hand from objective- and patient-perceived measurements

PURPOSE

To comprehend the associations among the dexterity and functional performance of the hands and quality of life in diabetic patients with neuropathic hands, via objective- and patient-perceived measurements.

METHODS

The study participants were 144 diabetes patients who received objective evaluations, including the Purdue pegboard test, electrophysiological testing in sensory amplitude of the median nerve, and self-administrated measurements, including the Michigan Hand Outcomes Questionnaire (MHQ) and Diabetes-39 (D-39). Pearson's and Spearman's correlation tests were conducted to assess the relationships among hand neuropathy, hand dexterity and functions, and quality of life.

RESULTS

The results show that the amplitude of the sensory nerve action potential of the median nerve was positively correlated with hand dexterity (r = 0.28-0.43; p < 0.01) and the total score of MHQ (r = 0.24-0.33; p < 0.01). Objective hand dexterity had mild to moderate relationships with most of the MHQ results, but only weak associations with some dimensions of the D-39 results. The MHQ results were negatively correlated with the D-39 scores, with mild to moderate relationships in the domains of energy/mobility and anxiety.

CONCLUSIONS

In comparison with diabetic feet, neuropathic diabetic hands are an easily neglected problem, with insufficient empirical evidence in the literature to indicate its impact on functional performance and quality of life. This study showed that lesions related to neural functioning in the diabetic hand may negatively influence dexterity and functional hand performance and thus also affect the quality of life.

How the impact of median neuropathy on sensorimotor control capability of hands for diabetes: an achievable assessment from functional perspectives

To comprehend the sensorimotor control ability in diabetic hands, this study investigated the sensation, motor function and precision pinch performances derived from a pinch-holding-up activity (PHUA) test of the hands of diabetic patients and healthy subjects. The precision, sensitivity and specificity of the PHUA test in the measurements of diabetic patients were also analyzed. We hypothesized that the diabetic hands would have impacts on the sensorimotor functions of the hand performances under functionally quantitative measurements. One hundred and fifty-nine patients with clinically defined diabetes mellitus (DM) and 95 age- and gender-matched healthy controls were included. Semmes-Weinstein monofilament (SWM), static and moving two-point discrimination (S2PD and M2PD), maximal pinch strength and precision pinch performance tests were conducted to evaluate the sensation, motor and sensorimotor status of the recruited hands. The results showed that there were significant differences (all p<0.05) in SWM, S2PD, M2PD and maximum pinch strength between the DM and control groups. A higher force ratio in the DM patients than in the controls (p<0.001) revealed a poor ability of pinch force adjustment in the DM patients. The percentage of maximal pinch strength was also significantly different (p<0.001) between the DM and control groups. The sensitivity, specificity and area under the receiver operating characteristic curve were 0.85, 0.51, and 0.724, respectively, for the PHUA test. Statistically significant degradations in sensory and motor functions and sensorimotor control ability were observed in the hands of the diabetic patients. The PHUA test could be feasibly used as a clinical tool to determine the sensorimotor function of the hands of diabetic patients from a functional perspective.

Carpal tunnel release in patients with diabetes: a 5-year follow-up with matched controls

PURPOSE

To compare clinical outcomes 5 years after carpal tunnel release among patients with and without diabetes.

METHODS

In a prospective consecutive series, 35 patients with diabetes (median age, 54 y; 15 type 1 and 20 type 2 diabetes) with carpal tunnel syndrome were age- and sex-matched with 31 control patients without diabetes (median age, 51 y) with idiopathic carpal tunnel syndrome. Exclusion criteria were other nerve entrapment, cervical radiculopathy, inflammatory joint disease, thyroid disorder, previous wrist fracture, and long-term exposure to vibrating tools. Participants were examined independently at baseline, 1 year, and 5 years after surgery for sensory function (Semmes-Weinstein), motor function (abductor pollicis brevis muscle strength and grip strength), cold intolerance, and completion of the Boston Carpal Tunnel Questionnaire symptom severity and functional status score.

RESULTS

Five years after surgery, the overall attendance rate for clinical examinations and completion of the Boston Carpal Tunnel Questionnaire were 86% and 95%, respectively. Between 1 and 5 years after surgery, there was a tendency toward a decrease in sensory function but an increase in motor function, with no statistically significant difference between groups. Cold intolerance demonstrated long-term significant improvement for patients with diabetes. The improvement in symptom severity and functional status score, as well as the large effect size, were maintained at 5 years in both patient groups.

CONCLUSIONS

Long-term improvement in patients with diabetes remained after carpal tunnel release to the same extent as for patients without diabetes. Furthermore, improvement in cold intolerance in patients with diabetes suggests the potential for the long-term regeneration of small nerve fibers.

TYPE OF STUDY/LEVEL OF EVIDENCE

Prognostic I.