Hand-transmitted vibration and occupational health / 环境与职业医学

The hand-arm vibration disease due to widespread hand-transmitted vibration operations is difficult to cure and seriously affects the health and quality of life of patients. Focusing on the prevention and control of hand-transmitted vibration and its occupational hazards, advances in occupational health relevant to hand-transmitted vibration were reviewed from the aspects of occupational hazard status, health impact, exposure monitoring, prevention and control of hand-transmitted vibration, as well as health surveillance, diagnosis, and treatment of hand-arm vibration disease. In addition, further suggestions on prevention and control of occupational hazards related with hand-transmitted vibration were prospected.

Effects of hand-transmitted vibration on upper limbs of workers: A meta-analysis / 环境与职业医学

Background Hand arm vibration disease (HAVD) is one of the legal occupational diseases in China, and its pathogenesis is not clear. Operators exposed to electric vibration tools for a long time have an increased risk of HAVD. Objective To conduct a systematic evaluation of the effects of vibration operations on workers' upper limb nerves, blood vessels, and muscles. Methods Relevant studies on the effects of hand-transmitted vibration on HAVD were searched and collected from the China Knowledge Infrastructure, Wanfang, and PubMed databases, and the literature was published from January 1974 to April 2021. The quality of cohort and case-control studies was assessed by the Newcastle-Ottawa Scale (NOS), and the quality of cross-sectional studies was by the evaluation criteria recommended by the Agency for Healthcare Quality and Research (AHRQ). Statistical analyses of outcome indicators (OR) in the included literature were performed using RevMan 5.4.1 software, effect sizes in the literature on vibration-induced white finger and neurosensory impairment were combined using a random-effect model, those that included carpal tunnel syndrome were combined using a fixed-effect model, and subgroup and publication bias analyses were also performed. To explore sources of study heterogeneity, meta-regression was performed using Stata 16.0 software, and sensitivity analyses were performed on the included literature. Results A total of 716 papers were retrieved from the databases, and 18 articles were retrieved by manual searching. A total of 34 papers were included after excluding those not meeting the criteria. Of the papers, 11004, 7270, and 1722 subjects related to vibration-induced white finger, neurosensory impairment, and carpal tunnel syndrome, respectively. The results of meta-analysis showed that compared with the control group, the combined ORs of hand-transmitted vibration exposure were 4.25 (95%CI: 2.72−6.65) for vibration-induced white finger, 4.03 (95%CI: 2.46−6.61) for neurosensory impairment, and 2.44 (95%CI: 1.61−3.71) for carpal tunnel syndrome. Heterogeneity was identified in the original studies related to vibration-induced white finger (I2=81%, P < 0.001) and neurosensory impairment (I2=90%, P < 0.001), except carpal tunnel syndrome (I2=23%, P < 0.001). The results of sensitivity analysis showed that the combined effect sizes (ORs) were stable and reliable. The results of meta-regression showed that the factors contributing to high heterogeneity of combined vibration-induced white finger and neurosensory impairment were time of publication (t=−2.10, P=0.049) and working age (t=−2.40, P=0.032), respectively. Conclusion Hand-transmitted vibration is a risk factor for vibration-induced white finger, neurosensory impairment, and carpal tunnel syndrome in operators.

Application of finger systolic blood pressure in the diagnosis of vibration-induced vascular injury / 中国职业医学

OBJECTIVE: To evaluate the application value of finger systolic blood pressure(FSBP) in the diagnosis of vibration-induced vascular injury. METHODS: Thirty patients with vibration-induced vascular injury [vibration-induced white finger(VWF)] were selected as the case group by a non-randomized concurrent controlled trial, and 30 hand-transmitted vibration workers without VWF were selected as the control group. The FSBP test was performed on the tested hands of all subjects, and the FSBP index of each Finger(F_( i)) was measured. RESULTS: The F_i of the index finger, middle finger, ring finger and tail finger of the tested hand in the case group were lower than that in the control group(all P<0.01). In the case group, the F_i of index finger was lower than ring finger and tail finger(all P<0.01). The abnormal rates of F_i on the index, middle and ring fingers in the case group were higher than those in the control group(86.7% vs 10.0%, 76.7% vs 13.3%, 43.3% vs 10.0%, all P<0.01). The area under the receiver operator characteristic curve of the measured F_i of the index finger, middle finger, ring finger and tail finger were 0.884, 0.843, 0.764 and 0.687 respectively. The diagnostic cut off value of the F_i of index finger was 80.2%. The sensitivity and specificity were 86.7% and 90.0%, respectively. CONCLUSION: FSBP test has a good application value in the diagnosis of vibration-induced vascular injuries. It is suggested that the F_i of index finger be the first choice as the diagnostic index, and the abnormal value can be set at 80.0%.

Changes of hemorheology and blood lipid index in patients with occupational hand-arm vibration disease / 中国职业医学

OBJECTIVE: To investigate the changes of hemorheology and blood lipid index in patients with occupational hand-arm vibration disease(OHAVD). METHODS: A total of 78 patients with OHAVD were selected as the OHAVD group, and 78 workers without hand transmitted vibration exposure were selected as control group by judgment sampling method. The hemorrheology and blood lipid indexes of the two groups were detected. RESULTS: The whole blood viscosities(low-, medium-and high-shear), hematocrit, erythrocyte aggregation index, and abnormal rate of whole blood viscosities(mid-and high-shear) in the OHAVD group were higher in the OHAVD group than that in the control group(P<0.05). The erythrocyte deformability index and erythrocyte electrophoresis index were lower in the OHAVD group than that of the control group(P<0.05). In the vibration-induced white finger(VWF) subgroup of the OHAVD group, the whole blood viscosity(low-, medium-and high-shear), hematocrit were increased(P<0.05), and the abnormal rate of whole blood viscosity(high-shear) was higher(P<0.017) than that of the control group.The whole blood viscosity(medium shear), hematocrit and erythrocyte aggregation index were increased in the non-VWF subgroup than that of the control group(P<0.017). The concentration of low density lipoprotein cholesterol in the OHAVD group and non-VWF subgroup was higher than that in the control group(P<0.05). The whole blood viscosity(low-, medium-and high-shear), hematocrit, erythrocyte deformability index, erythrocyte aggregation index and erythrocyte electrophoresis index were not correlated with the length of service and age in the OHAVD group(P>0.05). CONCLUSION: The changes of hemorheological properties and blood lipids in OHAVD patients may be associated with vibration vascular injury.

Síndrome vibratorio mano-brazo: revisión literaria / Hand-arm vibratory syndrome: literary review

Resumen El síndrome vibratorio mano-brazo forma parte de la categoría de enfermedades ocupacionales o asociadas al trabajo, específicamente aquellos trabajos manuales en los que se utilicen herramientas vibratorias, como taladros, moledoras, martillos neumáticos, sierras y cualquier otra que transmita energía vibratoria directamente a la mano y brazo del trabajador. La descripción de los primeros casos de este síndrome tuvo lugar hace ya más de un siglo, y con el desarrollo industrial se volvió progresivamente, en una entidad más importante en cuanto a la discapacidad y la pérdida de calidad de vida que genera en los pacientes, así como las pérdidas económicas y de horas laborales que produce a nivel mundial, en especial en los países más desarrollados en donde su prevalencia es notablemente mayor. En el presente artículo se ha realizado una revisión literaria acerca de los principales signos y síntomas de esta enfermedad, su clasificación, fisiopatología y métodos de diagnóstico. También se abordarán los mecanismos de prevención así como el pronóstico y evolución de los pacientes una vez han sido diagnosticados.

Abstract Hand-arm vibration syndrome is part of the occupational or work-related illness category, specifically those manual workers using vibratory tools such as drills, grinders, pneumatic hammers, saws and any other tool that transmits vibratory energy directly to the Hand and arm of the worker. The description of the first cases of this syndrome took place more than a century ago, and with the industrial development it became progressively, in a more important entity as far as the disability and the loss of quality of life that generates in the patients, As well as the economic losses and hours of work that it produces worldwide, especially in the more developed countries where its prevalence is significantly higher. In this article a literary review has been carried out on the main signs and symptoms of this disease, its classification, pathophysiology and diagnostic methods. The mechanisms of prevention as well as the prognosis and evolution of the patients once they have been diagnosed will also be addressed.

Correlation study between four vessel regulate factors and white finger evaluating in workers exposed to hand-arm vibration / 中国职业医学

OBJECTIVE: To analyze the correlation between four vessel regulate factors and vibration-induced white finger( VWF) evaluating in workers exposed to hand-arm vibration,and discuss the value of regulate factors for VWF screening.METHODS: Using typical sampling method,77 male workers exposed to hand-arm vibration with more than 1 year of polish work from a metalwork factory were selected as the study subjects. Based on the workers' self-report,they were divided into VWF group( 43 workers) and non-VWF group( 34 workers). The venous blood from center elbow was collected and plasma was separated. The plasma level of endothelin( ET) was detected by radioimmunoassay. The plasma levels of transforming growth factor beta( TGF-β),soluble intercellular adhesion molecule-1( s ICAM-1) and 5-hydroxytryptamine( 5-HT) were detected by enzyme-linked immunosorbent assay. The regulate factors for evaluating VWF were screened and the new multivariable model index

Quantitative Analysis of the Thermal Image of the Hand Dorsum in the Assessment of Peripheral Circulatory Impariment in Workers Exposed to Hand-Arm Vibration / 日本温泉気候物理医学会雑誌

Infrared thermography was performed on 38 forestry workers. The thermograms were analyzed separately for the left and right hands of each subject. Of 75 hands evaluated, vibration-induced white finger was noted in 18 (VWF group), and no symptoms were noted in 57 (non-VWF group). In addition to the above two groups, 42 subjects (84 hands) who had no symptoms of vibration exposure were used as a control group. Based of the thermograms taken after a local warming of the hands for 5min, the temperature distributions of the dorsal aspect of subject's hands were evaluated, and the thermal images of the hand with VWF were categorized into three main patterns. To establish a quantitative evaluation index that incorporates the characteristic thermal image observed in the VWF group, we constructed the representative parameters for each of the three thermogram patterns, and a linear discriminant analysis was performed using the presence or absence of VWF symptoms as the dependent variable and the constructed parameters as the independent variables. A discriminant score derived from this model expression was used as the evaluation index. The accuracy of the index was estimated according to a receiver operating characteristic (ROC) curve, and the area under the curve of 0.942 was obtained (p<0.001). When the cutoff point was set at the maximum point in the Youden index, the sensitivity of the VWF group was 94.4%, and the specificity of the non-VWF group and control group was 84.2% and 89.3%, respectively. These findings suggest that this newly proposed quantitative analysis method, which uses the thermal distributions of the dorsal side of the hand as indicators, may be useful for evaluating peripheral circulatory impairment of HAVS.

Diagnostic significance of cold provocation test at 12°C

In Germany, vibration-induced white finger (VWF) disease is accepted as an occupational disease (BK No. 2104 BKV), for which compensation may be paid provided that the sociolegal requirements are met in accordance with the list of occupational diseases that is valid at the time. A cold provocation test (thermometry, infrared thermography) is helpful in the diagnosis of VWF and we believe that it could contribute to the standardization of vascular assessment methods. In Germany, the approved degree of the decrease in earning power is downgraded as disease symptoms improve with time; therefore, insured individuals suffering from VWF are regularly reassessed every 1-3 years. In the context of such follow-up examinations and the assessment of reversibility of this disease, a standardized cold provocation test is of central importance. Currently, there is a lack of data that confirm the diagnostic value of this test. Further investigations on VWF patients to validate the use of the cold provocation test in obtaining sufficient data for determining the satisfactory diagnostic value of this test are required.

Test battery for assessing vascular disturbances of fingers

The diagnosis of vibration-induced white finger (VWF) is difficult, often relying on medical interview and history. The condition is characterized by an exaggerated vasoconstriction of digital arteries in response to cold. The complete closure of digital arteries is episodic and results in a characteristic blanching that is rarely observed by a clinician. Objective measurements of the response of the digital circulation to cold can assist in evaluating a patient for VWF. Finger systolic blood pressure (FSBP) following local cooling is a measure of cold-induced vasoconstriction in digital arteries and is an assessment of vasomotor tone. Low FSBPs following cooling are indicative of dysfunction. Finger skin temperature (FST) following hand cooling is a measure of cutaneous blood flow. The mechanism underlying the recovery of cutaneous blood flow following cooling is as yet not fully understood, but a delayed recovery is believed to arise from persistent vascular disturbances of the fingers or from a resulting in conflicting opinions concerning the utility of the measurements, a scarcity of comparable data from epidemiological investigations, and limited normative data to aid clinicians in decision-making. This review of evidence on which the tests are based is aimed at providing clinicians and researchers with an understanding of the factors that must be considered when conducting the tests, interpreting the results, and comparing results between different studies.

Standardization of finger systolic blood pressure (FSBP) cooling tests

A finger systolic blood pressure (FSBP) cooling test was introduced in 1977 and standardized during the following years for the optimal provocation and best characterization of an attack of vasospastic Raynaud's phenomenon (RP). The purpose of the present review is to compare and analyse some different techniques used in FSBP cooling tests from different countries and described in the final draft of the international standard, ISO/DIS 14835-2 (2004). The selected FSBP test results indicate to some extent that the tests are reliable and have acceptable diagnostic values despite the use of different techniques to obtain them. However, only a few studies used a zero-pressure FSBP%(0) to verify an ongoing attack of vasospastic RP. Most studies used an abnormal cold reaction FSBP%(A) located below the lower limit of controls, to make the anamnestic diagnosis of RP probable. According to the ISO draft, different types of finger cooling and body thermostating can be used together in the seated or supine position, and FSBP%(A) is indicated to be used for diagnostic purposes. Further studies are recommended to solve future standardization problems not included in the upcoming ISO standard. An international agreement on the presentation and comparison of test results is needed as a supplement to ISO/DIS 14835-2.

Factors influencing finger systolic blood pressure test for diagnosis of vibration-induced white finger

Finger systolic blood pressure (FSBP) measurement during finger cooling is a feasible method for the diagnosis of vibration-induced white finger (VWF). The standardization of the FSBP test is required. The final draft of an international standard for the measurement and evaluation of FSBP (ISO/DIS 14835-2) has been proposed in 2004. The aim of this review is to overview factors influencing the FSBP test and discuss some issues in the final draft. The FSBP test is a method of diagnosing VWF with reasonable sensitivity and specificity, although the sensitivity was relatively low in studies of mild VWF. The test results depend on cold provocation procedures including finger cooling, body cooling, room temperature and other factors such clothing and smoking. There are some versions of procedures for cold provocation and the tested fingers in the final draft. These may cause a low sensitivity of the FSBP test. To determine how the methodological difference influence the results of the FSBP test, further studies are needed. Although there are issues in the draft, the international standard of the FSBP test is extremely useful for the diagnosis, treatment and compensation of VWF.

Diagnostic Significance of Cold Provocation Test at 12\degC

In Germany, vibration-induced white finger (VWF) disease is accepted as an occupational disease (BK No. 2104 BKV), for which compensation may be paid provided that the sociolegal requirements are met in accordance with the list of occupational diseases that is valid at the time. A cold provocation test (thermometry, infrared thermography) is helpful in the diagnosis of VWF and we believe that it could contribute to the standardization of vascular assessment methods. In Germany, the approved degree of the decrease in earning power is downgraded as disease symptoms improve with time; therefore, insured individuals suffering from VWF are regularly reassessed every 1-3 years. In the context of such follow-up examinations and the assessment of reversibility of this disease, a standardized cold provocation test is of central importance. Currently, there is a lack of data that confirm the diagnostic value of this test. Further investigations on VWF patients to validate the use of the cold provocation test in obtaining sufficient data for determining the satisfactory diagnostic value of this test are required.

Factors Influencing Finger Systolic Blood Pressure Test for Diagnosis of Vibration-Induced White Finger

Finger systolic blood pressure (FSBP) measurement during finger cooling is a feasible method for the diagnosis of vibration-induced white finger (VWF). The standardization of the FSBP test is required. The final draft of an international standard for the measurement and evaluation of FSBP (ISO/DIS 14835-2) has been proposed in 2004. The aim of this review is to overview factors influencing the FSBP test and discuss some issues in the final draft. The FSBP test is a method of diagnosing VWF with reasonable sensitivity and specificity, although the sensitivity was relatively low in studies of mild VWF. The test results depend on cold provocation procedures including finger cooling, body cooling, room temperature and other factors such clothing and smoking. There are some versions of procedures for cold provocation and the tested fingers in the final draft. These may cause a low sensitivity of the FSBP test. To determine how the methodological difference influences the results of the FSBP test, further studies are needed. Although there are issues in the draft, the international standard of the FSBP test is extremely useful for the diagnosis, treatment and compensation of VWF.

Standardization of Finger Systolic Blood Pressure (FSBP) Cooling Tests

A finger systolic blood pressure (FSBP) cooling test was introduced in 1977 and standardized during the following years for the optimal provocation and best characterization of an attack of vasospastic Raynaud’s phenomenon (RP). The purpose of the present review is to compare and analyse some different techniques used in FSBP cooling tests from different countries and described in the final draft of the international standard, ISO/DIS 14835-2 (2004). The selected FSBP test results indicate to some extent that the tests are reliable and have acceptable diagnostic values despite the use of different techniques to obtain them. However, only a few studies used a zero-pressure FSBP%(0) to verify an ongoing attack of vasospastic RP. Most studies used an abnormal cold reaction FSBP%(A), located below the lower limit of controls, to make the anamnestic diagnosis of RP probable. According to the ISO draft, different types of finger cooling and body thermostating can be used together in the seated or supine position, and FSBP%(A) is indicated to be used for diagnostic purposes. Further studies are recommended to solve future standardization problems not included in the upcoming ISO standard. An international agreement on the presentation and comparison of test results is needed as a supplement to ISO/DIS 14835-2.

Test Battery for Assessing Vascular Disturbances of Fingers

The diagnosis of vibration-induced white finger (VWF) is difficult, often relying on medical interview and history. The condition is characterized by an exaggerated vasoconstriction of digital arteries in response to cold. The complete closure of digital arteries is episodic and results in a characteristic blanching that is rarely observed by a clinician. Objective measurements of the response of the digital circulation to cold can assist in evaluating a patient for VWF. Finger systolic blood pressure (FSBP) following local cooling is a measure of cold-induced vasoconstriction in digital arteries and is an assessment of vasomotor tone. Low FSBPs following cooling are indicative of dysfunction. Finger skin temperature (FST) following hand cooling is a measure of cutaneous blood flow. The mechanism underlying the recovery of cutaneous blood flow following cooling is as yet not fully understood, but a delayed recovery is believed to arise from persistent vascular disturbances of the fingers or from a delayed release of vasospasm, or both. There are various methods of conducting both of these tests, resulting in conflicting opinions concerning the utility of the measurements, a scarcity of comparable data from epidemiological investigations, and limited normative data to aid clinicians in decision-making. This review of evidence on which the tests are based is aimed at providing clinicians and researchers with an understanding of the factors that must be considered when conducting the tests, interpreting the results, and comparing results between different studies.

Autonomic Nervous Response to Cold Provocation in Vibration-Induced White Finger(VWF) Patients with HRV Analysis / 航天医学与医学工程

Objective To evaluate the autonomic nervous response of Vibration-induced white finger(VWF) patients to cold provocation test by power spectral analysis of heart rate variability(HRV).Methods The cold provocation test was conducted in 22 VWF patients and 19 healthy volunteers.ECG was recorded during the experiment,and converted to R-R interval signals after the experiment.The normalized LF[(0.02～0.15) Hz]component power,normalized HF[(0.15～0.40) Hz] component power and the ratio of LF to HF power(LF/HF ratio) were calculated.Results At the beginning of cold exposure,there were a significant decrease of HF% in both groups,and a significant increase of LF/HF ratio in VWF group as compared with pre-exposure value.The LF/HF ratio in VWF group during cold exposure was significantly higher than that in the control group.Conclusion Cold stimuli induced depression of parasympathetic nervous system in both groups,and the sympatho-vagal balance was maintained in the control group,but in VWF group it became sympathetic dominance during cold exposure.The sympathetic nervous system of VWF patients may be hyperreactive to cold stimuli.