Track topics on Twitter Track topics that are important to you
Foot ulceration is a risk factor that has been associated with early death in patients with chronic kidney disease. Little is known about the relationship between these risk factors that develop in patients with kidney failure and the onset of lower limb threatening foot ulcers.
Diabetes is a major cause of both kidney disease and foot ulceration; however a previous study reported that a significant proportion of kidney failure patients on haemodialysis treatment without a diagnosis of diabetes also had these risk factors that could lead to foot ulceration.
The aim of this study will be to identify these risk factors associated with lower limb threatening disease in patients with advanced kidney failure. In addition a robust screening tool will be developed to address the reliability and validity of current screening methods deemed to be gold standard in the assessment of diabetic foot disease in this Chronic Kidney Disease population.
It is important to follow the progression of these risk factors as the kidney failure worsens. The study also intends to screen patients as they start dialysis treatment and follow their progress with respect to risk factors known to predispose to foot ulceration over their first year of treatment. The proposed outcome from this study is to develop a strategy to identify patients with kidney failure that are at risk of foot ulceration and intervene at an early point to prevent the life threatening complications associated foot disease.
The risk factors contributing to foot ulceration in the diabetic population are well published, and an abundance of these publications demonstrate the acceleration of risk factors in association with diabetic nephropathy.
It is also apparent that there are risk factors present in the non-diabetic Chronic Kidney Disease population but much less information about there prevalence and progression is published. A recent pilot study reported significant risk factors for foot ulceration in a population of subjects receiving haemodialysis therapy in the absence of diabetes mellitus.
The study will aim to increase the understanding of Chronic Kidney Disease (CKD) and the development of foot ulceration in the diabetic and non-diabetic Chronic Kidney Disease population as renal failure progresses and dialysis is initiated.
Design and methodology:
It is proposed to identify patients with Chronic Kidney Disease level 4 (renal function at between 15 and 30% of normal)in the Nephrology clinics at University Hospital of Wales, Cardiff. It is this group of patients that are most at risk of progression of renal disease towards end stage and subsequent need for dialysis.
A proportion of the patients will be identified from the pre-dialysis clinics that are due to commence dialysis imminently. It is this group of patients that will used to examine the specific effects of dialysis modality on risk factors for foot ulceration The directorate of Nephrology and Transplantation in Cardiff has 450 haemodialysis patients, 140 peritoneal dialysis (CAPD) patients, and around 400 Chronic Kidney Disease level 4 patients. Approximately 100 new patients commence dialysis each year of which 35 will start peritoneal dialysis and the rest haemodialysis.
Renal patients currently have the freedom to choose their preferred modality of dialysis following a series of informed consultations with the Physician. One method may be indicated over another if the patient does not meet the suitability criteria for one or other of the modalities. However, current recruitment trends demonstrate that most patients prefer to choose haemodialysis despite the socioeconomic challenges the therapy poses on their quality of life and the cost constraints on the health service.
A previous study demonstrated that 20% of patients with diabetes develop foot ulceration within the first year of commencing haemodialysis and this may be attributed to the hypoxia of the peripheral tissues during the haemodialysis process. There is much less information about the changes seen with the initiation of peritoneal dialysis and this study may help to influence dialysis modality choice in the future if one method of dialysis is associated with the development of fewer lower limb threatening complications.
Inclusion criteria: Stage 4/5 Chronic Kidney Disease (eGFR <30ml/min) Over 18 years of age Exclusion criteria: Chronic Kidney Disease Stage 1-3 (eGFR >31) Inability or refusal to give informed consent Life expectancy < 6 months
The Proton database held within Nephrology along with clinic lists will be used to identify potential patients by the research team and an invitation letter will be sent with a study information leaflet prior to their clinic visit.
The Physician in the clinic will recruit the patient to take part in the study during the Outpatient consultation. Clinic lists will also be reviewed to identify patients with Chronic Kidney Disease stage 4/5.
The longitudinal prospective study proposed would expand on pilot study results to include level 4 Chronic Kidney Disease and monitor the development of lower limb threatening risk factors with the progression of kidney failure towards end stage renal disease.Patients will be followed for a 2 year period.
A single Podiatrist will undertake the interview and use non-invasive techniques to assess feet for physiological risk factors in accordance with evidence-based practice.
The Renal Foot Screening Tool has been developed and will be used to prospectively identify the neurovascular risk factors for foot ulceration.
Patients would have podiatry assessment at baseline, 12 and 24 months. In addition a triggered assessment would take place at commencement of dialysis.
Power calculations are difficult to undertake given the lack of current knowledge of risk factors for this group of patients. Following consultation with a statistician on the supervisory team the minimum figure of 100 has been adopted as the target for Chronic Kidney Disease level 4 patients with an additional minimum 100 patients commencing renal replacement therapy over the course of the study period.The target for recruitment was estimated taking into account the financial and resource implications, and was agreed by the supervisory team to be a realistic sample size. Subsequent statistical analysis will include multiple regression.
Demographic and medical information will be obtained through patient interview and medical records at the time of the foot screening.
Patients will be questioned about prior foot care education, patient perception of their current foot health status, history of Podiatry care, history of foot ulceration and previous amputation.
Non-invasive assessment techniques
No current foot screening provision for patients with Chronic Kidney Disease exists in Cardiff.
The research participants will have a detailed foot screening consultation that will identify potential risks of foot ulceration allowing earlier intervention should it be required.
The patients enrolled into this study will have enhanced care in terms of identification of potential foot ulceration. However, this does raise some ethical concerns. The first is that patients may be seen at presentation with a foot ulcer or be at high risk of developing a foot ulcer and these patients will be referred to the Podiatry service for routine treatment. The other issue is that patients will not be given verbal education regarding their specific foot care needs during the contacts. We justify this in that we are trying to find the factors associated with Chronic Kidney Disease that contribute to foot ulceration in a longitudinal fashion. Intervention with education could confound the true prevalence for the study. We would acknowledge that simply checking the feet of a patient would alter their awareness and this also may influence the study findings in a small way. Information leaflet provided to each high risk participant will give indications of the danger signs that can preceded to ulceration and infection,with a help line telephone number to call should a participant develop any of these warning signs.
The participant will be fast track referred to the Cardiff & Vale Podiatry department, and given an urgent appointment at a Cardiff & Vale Podiatry Wound Clinic for a treatment plan. Follow up care will be provided by the local Community Podiatry Service after the wound has healed.
Non-healing foot ulcers will be referred to the Multi-disciplinary Foot Ulcer Clinic for review by the Vascular, Orthopaedic, and Medical team.
To ensure all patients with neuropathy are identified multiple forms of assessment will be used for each patient. All methods of assessment are standardised, and any tests will be demonstrated on the back of one hand for the patient to experience prior to formal neuropathy testing.
The previously published Neuropathy Symptom Score is used to pick up symptomatic peripheral neuropathy. This scoring system is used to identify the sensory symptoms of peripheral neuropathy, such as aching, burning, prickling, numbness, and sharp pain.
Light pressure sensation is tested using the Semmes-Weinstein 10g monofilament at 10 sites on each foot. The patient is instructed to close their eyes, the 10g monofilament is applied at a 90 degree right angle to the selected site until it buckled, and held for 1 second before moving onto the next test site.
A positive neuropathy score for the monofilament assessment is defined as inability to perceive the monofilament sensation on the testing sites on each foot.
A neurothesiometer is used to test vibration perception threshold. This device is applied with the tractor balanced vertically onto the pulp of the hallux with the voltage increased at the base unit until the patient can perceive the vibration sensation. A mean of three readings would be recorded for each foot.A value of 25 volts and over would confirm the patient being 'At Risk' of foot ulceration.
Given that patients often score differently for each test, patients with a positive score during any of the 3 repetitions are classified as having peripheral neuropathy.
The Edinburgh Claudication Questionnaire is used to diagnose symptomatic vascular insufficiency. Patients score positive for symptomatic vascular insufficiency if they described either symptoms of intermittent claudication or rest pain. The possibility of concomitant peripheral neuropathy in this patient population is such that symptoms alone are insufficient to diagnose peripheral vascular disease. Therefore a hand held Doppler ultrasound is used to locate the dorsalis pedis and posterior tibial arteries. The probe is lightly applied to the skin to avoid occlusion of the artery, and the audible sound is reproduced on a printout in preparation for waveform analysis.
Arterial insufficiency is recorded when both the dorsalis pedis and posterior tibial signals are monophasic in a single lower limb.
It is recognised that foot pathology is an additional risk factor for foot ulceration especially in those patients with either peripheral neuropathy or vascular insufficiency.
Both feet are visually inspected for common pathologies predisposing to diabetic foot ulceration. Any deformity, including hammer toes and Charcot deformity, nail dystrophies, corns and calluses are reported as additional risk factors.
The presence of active foot ulceration is documented and graded according to the Texas Wound Classification system to ascertain the severity of the wounds presenting within a cohort.
Data collected on laptop will only have study identification number recorded to ensure the anonymisation of participants during data collection and data analysis by the research team statistician. The laptop will be password secure and be stored in a locked filling cabinet in a locked office with key access to the Band 7 Podiatrist. Files containing consent forms will be indexed in numerical order of study identification numbers, and will be stored in a locked filling cabinet with only access to the Principle Investigator and the Band 7 Podiatrist. The file will be the only source of person identifiable information.
Body Composition Monitoring:
The use of a none invasive assessment of body composition will allow a review of body fluid status which may impact on the ability of tissues to heal.
A Podiatrist will be required to undertake this longitudinal study on a part time basis. This is supported by the fact that the highly specialised skills developed by the Podiatrist need to be maintained during the PhD study period also require a contribution of specialist clinical duties.
The equipment needed to make the measurements is available from the department of Podiatry and is calibrated and used on a day to day basis for current patient care.
Willing participants will be offered foot screening at the end of the Nephrology OPD consultation to minimise any further inconvenience with travelling and parking costs A contribution may be required for patients travelling expenses when they are recalled.
The full support of the Institute of Nephrology has been obtained in terms of supervision by a Consultant Nephrologist and access to patient information.
It is proposed that this work will be presented at Podiatry and Renal conferences in the UK and overseas. Minimum of 3 papers and 3 conference presentations. There is room for publication in Podiatry and Renal publications to ensure both groups of professionals are informed. Posters will be prepared for international conferences. There is also an opportunity to consider Nursing conferences to raise general awareness of the issue, and any opportunities that arise for the preparation of review articles will be taken.
Outcomes and impact:
The primary outcome of the study is to identify the neurovascular risk factors for foot ulceration as renal function declines, and to develop a suitable foot protection programme for Chronic Kidney Disease patients. The secondary outcome measure is to identify whether dialysis modality choice influence foot ulcer development and should this be used to inform patient choice of dialysis.
Observational Model: Cohort, Time Perspective: Prospective
Chronic Kidney Disease
University Hospital of Wales
Not yet recruiting
Published on BioPortfolio: 2014-08-27T03:15:05-0400
Protein energy wasting is an independent factor associated with morbi-mortality in chronic kidney disease. Wasting is particularly common in chronic diseases of organs such as kidney disea...
The purpose of this study is to learn more about how the kidneys control the blood levels of phosphorus in patients with early chronic kidney disease. The ultimate goal is to use this inf...
The purpose of this study is to verify the efficacy of diuretic therapy on blood pressure control and left ventricular mass in patients affected by chronic kidney disease
A Phase II, Open-Label Safety and Efficacy Study of an Autologous Neo-Kidney Augment (NKA) in Patients With Type 2 Diabetes and Chronic Kidney Disease (RMTX-CL001). NKA is made from expand...
The objective of this long term study is to prospectively compare the incidence of NSF in two cohorts (Cohort 1- patients with moderate chronic kidney disease eGFR 30-59 and Cohort 2- pati...
Management of patients with chronic kidney disease has evolved since the last Kidney Disease Improving Global Outcomes clinical practice guideline was published in 2012. This article reviews the most ...
Proton pump inhibitor use is associated with incident chronic kidney disease, chronic kidney disease progression and end-stage renal disease. However, the extent of proton pump inhibitor prescriptions...
Chronic kidney disease is a global health problem that affects over 10% of adults worldwide. All doctors should have a basic knowledge of chronic kidney disease because it may complicate the managemen...
Chronic kidney disease (CKD) is recognised as a global public health problem, more prevalent in older persons and associated with multiple co-morbidities. Diabetes mellitus and hypertension are common...
Acute kidney injury (AKI) incidence is reported to be 10 times higher in aged people. Related to their higher prevalence of chronic kidney disease (CKD), older patients are at high risk of toxic effec...
Conditions in which the KIDNEYS perform below the normal level for more than three months. Chronic kidney insufficiency is classified by five stages according to the decline in GLOMERULAR FILTRATION RATE and the degree of kidney damage (as measured by the level of PROTEINURIA). The most severe form is the end-stage renal disease (CHRONIC KIDNEY FAILURE). (Kidney Foundation: Kidney Disease Outcome Quality Initiative, 2002)
The end-stage of CHRONIC RENAL INSUFFICIENCY. It is characterized by the severe irreversible kidney damage (as measured by the level of PROTEINURIA) and the reduction in GLOMERULAR FILTRATION RATE to less than 15 ml per min (Kidney Foundation: Kidney Disease Outcome Quality Initiative, 2002). These patients generally require HEMODIALYSIS or KIDNEY TRANSPLANTATION.
Decalcification of bone or abnormal bone development due to chronic KIDNEY DISEASES, in which 1,25-DIHYDROXYVITAMIN D3 synthesis by the kidneys is impaired, leading to reduced negative feedback on PARATHYROID HORMONE. The resulting SECONDARY HYPERPARATHYROIDISM eventually leads to bone disorders.
Distortion or disfigurement of the foot, or a part of the foot, acquired through disease or injury after birth.
Abnormal enlargement or swelling of a KIDNEY due to dilation of the KIDNEY CALICES and the KIDNEY PELVIS. It is often associated with obstruction of the URETER or chronic kidney diseases that prevents normal drainage of urine into the URINARY BLADDER.
Nephrology - kidney function
Nephrology is a specialty of medicine and pediatrics that concerns itself with the study of normal kidney function, kidney problems, the treatment of kidney problems and renal replacement therapy (dialysis and kidney transplantation). Systemic conditions...
Chronic kidney disease (CKD), also known as chronic renal disease, is a progressive loss in renal function over a period of months or years. The symptoms of worsening kidney function are non-specific, and might include feeling generally unwell and experi...