Renal Dialysis Clinical Trial
Most patients with end-stage renal disease require hemodialysis. An arteriovenous fistula
(AVF) or a prosthetic arteriovenous graft (AVG) is the preferred accesses for this. After
its surgical creation, the fistular vein immediately faces a tremendous blood flow and the
venous lumen is gradually dilated and the wall thickened, producing an access that can be
routinely needled and deliver sufficient blood flow for dialysis. However, many hemodialysis
patients will experience access stenosis, dysfunction, and even thrombosis, which are the
most common complications of a hemodialysis access.
Most physicians, in-charge nurses of the hemodialysis unit, patient, and/or the family use
traditional stethoscope as a convenient method to evaluate the patency and function of a
hemodialysis access before, during, and after each session of dialysis. The acoustic signal
of an access is always affected by environmental noises, non-specific in nature, and the
sensitivity to detect stenosis is very low.
With the development and use of electronic stethoscope, the proprietary ambient noise
acoustically cancels out an average of 75% of distracting room noise, greatly enhancing
overall utility. However, the output acoustic signals are still apprehended by the ear,
which is the main source of bias and errors of detection.
Our study purpose is to apply the signal processing technology to transfer the acoustic
signals into simple visual signals that provide an easy way to read. It can be used by a
professional medical staff, a non-professional person responsible for taking care, or even
the patient himself, disability or not, as an early screening detector of stenosis or
dysfunction of a hemodialysis access.
n/a
Observational Model: Case-Only, Time Perspective: Prospective
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