Articles: pain-measurement.
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Comparative Study
The dimensions of pain: a multidimensional scaling comparison of cancer patients and healthy volunteers.
This paper presents a new approach to the measurement and understanding of clinical pain. A multidimensional scaling (MDS) procedure was used to analyze pairwise similarity judgments made to 9 pain descriptors by 24 cancer pain patients and 24 healthy volunteers. The question was whether the dimensions of the global pain space differed between the 2 groups. ⋯ The subject weight space revealed that the Pain Intensity dimension was the most important dimension for the patients, while Emotional Quality was more salient for the volunteers. Wide differences were found in the salience of the various dimensions to different individuals; this information may prove useful for tailoring patient treatment. The study demonstrates that MDS procedures such as INDSCAL, in which the subjects (rather than the researcher) determine the number and characteristics of the global pain dimensions, will improve our understanding and treatment of pain.
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In the first part of the study 20 subjects (11 headache, 9 normals) free-sorted descriptors from the intensity and affect scales of the Tursky pain perception profile (PPP) into groups on the basis of similar meaning. In part 2 they made similarity ratings of all pairs of words within the intensity and affect scales. In the third part of the study subjects completed a cross-modal matching task to scale the intensity and affect words. ⋯ An MDS analysis showed that the groups could be located in 2-dimensional space in which the dimensions of intensity and affective distress could be easily discerned. When the descriptors from the intensity and affect scales were rated within each scale, a second MDS analysis showed that, whereas the intensity descriptors could be fitted by a 1-dimensional representation, the affect descriptors required a 3-dimensional model. There was evidence that subjects with extensive pain experience placed greater weight on the second and third affective dimensions compared with relatively pain-free subjects.
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Tursky's pain perception profile [16] has been revised and adapted for use in German-speaking conditions, and this new modification is presented. It integrates six different methods of clinical and experimental methods of clinical and experimental pain measurement, which are intended to meet the enhanced demands put forward in pain research for multivariate measurement of pain by a variety of methods. ⋯ The results document the many aspects of chronic pain and the necessity for multimodal measurement. In addition, they supply a means of achieving a better pain-related classification of pain patients on an experimental basis.
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One hundred and ten outpatients with either acute or chronic low-back pain completed the McGill Pain Questionnaire, Beck Depression Inventory, State-Trait Anxiety Inventory, and Life Experiences Survey. Acutes and chronics did not differ on dimensions of pain, but significant correlations between pain dimensions and depression and state anxiety were found for chronics. ⋯ Combined scores on depression, anxiety, and negative life change predicted sensory and affective pain for the pooled sample. These results confirm the role of psychological variables in the experience of clinical pain and underscore the highly affective nature of chronic pain.
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The cold pressor test elicits an emotional/motivational pain experience from the immersion of a limb in cold water. It has been widely used to evaluate (experimental and chronic) pain. However, normative models for quantification and comparison for pain tolerance have not previously been established. ⋯ The results indicate that at any given age Anglo-Saxon males have the longest tolerance time followed by non-Anglo-Saxon males, Anglo-Saxon females, and finally non-Anglo-Saxon females. There is a consistent decrease in tolerance time as the male age increases and minimal change in tolerance time as the female age increases. Chronic pain patients exhibited the same type of pain response pattern as healthy volunteers when corrected for age, sex, and ethnocultural subgroup.