Evaluation  |  Advantages  |  Target  |  Clinical research  |  Related Documents

Evaluation


Assessment using PainVision

Principle and Definition

PainVision is a device that compares the level of pain to the level of stimulating current (stimulation by pulse current). Pain is quantitatively assessed by measuring the stimulating current that is acknowledged by the patient as being equivalent in sensation to pain. Before evaluating pain, the baseline (Current Perception Threshold) is measured to eliminate individual variability due to various factors.

The pain level is a non-dimensional parameter at zero when no pain is felt, presenting the level of genuine pain in the rage of 2000+.

How to Take Measurements

PainVision takes measurements using electrical stimulation with a low-frequency current (50 Hz, 0 – 256 μA). A stimulating electrode needs to be placed on the inner side of the forearm, avoiding areas of pain. Current Perception Threshold and Pain Equivalent Current are measured three times by gradually increasing the stimulating current. The results will be recorded in the Software, and the pain level will be calculated.

How to Use

By measuring the degree of pain, PainVision allows quantitative assessment of the intensity of pain and the effect of treatment.

Conventional Pain Rating Methods

Since pain is essentially a patient’s subjective sense, assessment of pain is complicated by bias and psychological factors. Therefore, conducting an objective assessment of pain is associated with many difficulties. The followings are the methods that have been used traditionally. Combination of these methods with assessment using PainVision enables multifaceted assessment of pain:

Pain rating scales

  • Visual Analog Scale : VAS
  • Numerical Rating Scale : NRS
  • Verbal Rating Scale : VRS
  • Face Rating Scale : FRS

Pain rating scales including behavioral aspect

  • Prince Henry Pain Scale : PRS
  • Children’s Hospital Estarn Ontario Pain Scale : CHEOPS

Assessment of pain quality, behavior and QOL

  • McGill Pain Questionnaire : MPQ
  • SF-36 (Medical Outcome Study Short-Form 36-Item Health Survery)
  • PDAS (Pain Disability Assessment Scale)

Although it is difficult to quantify pain, it is possible to quantify the level or degree of pain.
(The information may be used for treatment or research)
Reference: Japan Medical Association Journal) 2009; 138(3): 572-573


Advantages


PainVision ® PS-2100 quantifies the level of pain using electrical stimulation. Pain management can be made effective and simple during a diagnosis by incorporating “pain level”, displayed as an objective value, in combination with the visual analog scale, a subjective value reflecting psychological factors.

Benefits of quantifying postoperative pain

Quantification of post-operative pain can facilitate the best postoperative management plan (treatment plan) for patients and physicians. By establishing a postoperative management plan, physicians, hospitals and patients can obtain the following benefits:

For Physicians

By quantifying postoperative pain, a physician can reduce unnecessary pain management procedures on an affected area and establish an appropriate treatment plan from postoperative treatment to rehabilitation.

For Hospitals

By establishing a postoperative treatment plan until rehabilitation, a hospital can secure profit from providing high-quality medical services.

For Patients

By optimizing postoperative management, a patient can receive high-quality medical services, safe and secure treatment and postoperative procedures.

  1. Quantification of pain enables a patient to share its discomfort level with the physician which may lead to identification of a disease.
  2. Psychogenic pain due to chronic pain (e.g., insomnia, depression) may be prevented.
  3. Neurogenic pain may be diagnosed and treated appropriately.

Target


PainVision ® PS-2100 quantifies the level of pain using electrical stimulation. Pain management can be made effective and simple during a diagnosis by incorporating “pain level”, displayed as an objective value, in combination with the visual analog scale, a subjective value reflecting psychological factors.

Clinical Departments

Pain, treatment evaluation, etc.
Pain, treatment evaluation, etc.
Evaluation of diabetic peripheral neuropathy
Pain, treatment evaluation, etc.
Pain, treatment evaluation, etc.
Pain, treatment evaluation, etc.
Pain evaluation
Evaluation of age-related neurological problems
Drug efficiency evaluation

Pain clinic, anesthesiology
Neurosurgery, neurology
Endocrinology
Orthopedics
Plastic surgery
Dental, oral surgery
Rheumatology
Geriatrics
Pharmaceutical

Users

Pain management
Clinical investigator
Stress management counselor
Physical/occupational/recreational therapist
Psychologist

Clinical research


Options for Research

PainVision provides various options for research.

In combination with Functional MRI

Oral stimulating electrode

For measurements of Current Perception Threshold in the mouth, PainVision provides specifically designed proprietary electrode and electrode cable.