ABSTRACT
We designed a spandex tank top with dry electrodes for continuous electrocardiogram (ECG) recording. This pilot study determined the best fabric, the best electrode types, sizes, and locations. Optimal electrodes provide high signal to artifact ratio (SAR) and reliability by meeting the following criteria: 1) low baseline shift, 2) high adhesion, 3) good physical stability, 4) large effective area, 5) thin with high flexibility (Luo et al 1992). We compared electrodes from three main groups: Ag/AgCl gel electrode, commercial conductive rubber and foam-metal based electrodes. Ag/AgCl gel electrodes are easy to apply, make good body contact and do not slip during the course of an experiment. We found that higher SARs are obtained when electrode area is increased (40 mm diameter) and the two dry measurement electrodes are located on convex areas (over chest muscle) rather than concave areas (over sternum), so the spandex will apply light pressure to the dry electrode to yield good electrode to skin contact. We experimentally validated findings with 24 subjects: 12 men and 12 women wearing the tank top with gel and dry electrodes, by monitoring movements imitating daily life while continuously recording their ECGs.
Subject(s)
Electrocardiography, Ambulatory/instrumentation , Electrodes , Gels , Activities of Daily Living , Adolescent , Adult , Aged , Algorithms , Clothing , Equipment Design , Female , Humans , Male , Metals , Middle Aged , Motor Activity/physiology , Pilot Projects , Rubber , Silver Compounds , Textiles , Young AdultABSTRACT
Patient biopotentials are usually measured with conventional disposable Ag/AgCl electrodes. These electrodes provide excellent signal quality but are irritating for long-term use. Skin preparation is usually required prior to the application of electrodes such as shaving and cleansing with alcohol. To overcome these difficulties, researchers and caregivers seek alternative electrodes that would be acceptable in clinical and research environments. Dry electrodes that operate without gel, adhesive or even skin preparation have been studied for many decades. They are used in research applications, but they have yet to achieve acceptance for medical use. So far, a complete comparison and evaluation of dry electrodes is not well described in the literature. This work compares dry electrodes for biomedical use and physiological research, and reviews some novel systems developed for cardiac monitoring. Lastly, the paper provides suggestions to develop a dry-electrode-based system for mobile and long-term cardiac monitoring applications.
Subject(s)
Electrocardiography/instrumentation , Cardiology , Electrodes , Humans , Mechanical Phenomena , Models, Biological , SkinABSTRACT
INTRODUCTION: According to our data on 4 071 patients with type 2 diabetes, 65.5% of the men and 70.4% of the women complain of lower urinary tract symptoms (LUTS). That is twice as much as the normal population for the same age group. The most common symptom was overactive bladder (OAB). In patients with a diabetes-related complication such as retinopathy or nephropathy, the incidence for LUTS was about 20% higher than that in patients without complications, whereas in men with diabetes mellitus type 2 and erectile dysfunction (ED) the incidence for LUTS was 31.9% higher than without ED. We wanted to compare the incidence of LUTS in patients with type 2 diabetes and ED against patients without ED as well as women with type 2 diabetes. RESULTS: Men with ED had a statistically significant longer history of diabetes, a higher HbA1c and increased serum creatinine compared to men without ED (p value <0.0001). The length of diabetes history was not statistically relevant compared to women with type 2 diabetes. However the HbA1c and serum creatinine were higher than those of the women from the data bank (p value <0.0001). Diabetic men with ED complained more often of urinary incontinence, urge incontinence and made more often use of incontinence pads (p value <0.0001). As for pollakisuria and nocturia the difference was not significant. 42.3% of type 2 diabetic patients with ED were diagnosed with OAB by their urologist or GP. That was significantly more than type 2 diabetic patients without ED and type 2 diabetic women (see graph). The same was true of stress incontinence, overflow incontinence and non-classified incontinence with the exception of faecal incontinence. Patients with type 2 diabetes and ED had to take drugs more often than type 2 diabetic men without ED and women with diabetes. CONCLUSION: Amongst patients with type 2 diabetes, ED increases the risk of developing lower urinary tract disorders. Moreover it is connected with a higher HbA1c and a higher risk for LUTS, especially for OAB. The regular use of incontinence pads in every fourth patient with type 2 diabetes and erectile dysfunction demonstrates a high number of under-treated patients. Patients with type 2 diabetes and especially patients with type 2 diabetes AND erectile dysfunction represent a risk group that needs special attention and a special management plan from urologists and GPs.
