Standardizing procedures to study sensitization of human spinal nociceptive processes: Comparing parameters for temporal summation of the nociceptive flexion reflex (TS-NFR)

Temporal summation of pain (TS-pain) is the progressive increase in pain ratings during a series of noxious stimulations. TS-pain has been used to make inferences about sensitization of spinal nociceptive processes; however, pain report can be biased thereby leading to problems with this inference. Temporal summation of the nociceptive flexion reflex (TS-NFR, a physiological measure of spinal nociception) can potentially overcome report bias, but there have been few attempts (generally with small Ns) to standardize TS-NFR procedures. In this study, 50 healthy participants received 25 series of noxious electric stimulations to evoke TS-NFR and TS-pain. Goals were to: 1) determine the stimulation frequency that best elicits TS-NFR and reduces electromyogram (EMG) contamination from muscle tension, 2) determine the minimum number of stimulations per series before NFR summation asymptotes, 3) compare NFR definition intervals (90-150 ms vs. 70-150 ms post-stimulation), and 4) compare TS-pain and TS-NFR when different stimulation frequencies are used. Results indicated TS-NFR should be elicited by a series of three stimuli delivered at 2.0 Hz and TS-NFR should be defined from a 70-150 ms post-stimulation scoring interval. Unfortunately, EMG contamination from muscle tension was greatest during 2.0 Hz series. Discrepancies were noted between TS-NFR and TS-pain which raise concerns about using pain ratings to infer changes in spinal nociceptive processes. And finally, some individuals did not have reliable NFRs when the stimulation intensity was set at NFR threshold during TS-NFR testing; therefore, a higher intensity is needed. Implications of findings are discussed.     

Serotonin transporter gene (5-HTTLPR) polymorphisms are associated with emotional modulation of pain but not emotional modulation of spinal nociception

The short allele of the serotonin transporter gene (5-HTTLPR) is associated with greater negative emotionality. Given that emotion modulates pain, short allele carriers (s-carriers) may also demonstrate altered pain modulation. The present study used a well-validated emotional picture-viewing paradigm to modulate pain and the nociceptive flexion reflex (NFR, a measure of spinal nociception) in 144 healthy genotyped participants. As expected, pain/NFR responses were largest during unpleasant pictures and smallest during pleasant pictures. However, relative to l/l-carriers, s-carriers demonstrated greater pain inhibition during pleasant pictures and greater pain facilitation during unpleasant pictures. Neither emotional modulation of NFR nor NFR threshold was associated with 5-HTTLPR polymorphisms. Results also indicated that men who were s-carriers had a higher pain threshold and tolerance than other participants. Taken together, our results indicate 5-HTTLPR polymorphisms may influence pain modulation at the supraspinal (not spinal) level; however, the influence on pain sensitivity may be sex-specific.     

How information about other people's personal experiences can help with healthcare decision-making: a qualitative study

Objective

To investigate people's views of using ‘general facts’ and information about other people's ‘personal experiences’ for health-related decision-making.

Methods

Sixty-two people, who between them had experience of five different focal health issues, participated in 12 focus groups and 9 interviews. Exploration of uses of the two types of information was supported by discussion of illustrative excerpts.

Results

There was less discussion of ‘general facts’; participants thought it obvious that good decisions required these. Participants reported having used ‘personal experiences’ information to: recognise decisions that needed consideration; identify options; appraise options and make selections (including by developing and reflecting on their reasoning about possible choices); and support coping strategies. Their inclination to use ‘personal experiences’ information was apparently moderated by assessments of personal relevance, the motives of information providers and the ‘balance’ of experiences presented.

Conclusion

People can use ‘personal experiences’ information in various ways to support their decision-making, and exercise some discrimination as they do.

Practice implications

‘Personal experiences’ information may help people in a number of ways in relation to decision-making. However, ‘personal experiences’ information does not replace the need for ‘general facts’ and care should be taken when it is used in resources for patients.     

Blood product positive patient identification: comparative simulation-based usability test of two commercial products

BACKGROUND: The blood product administration process has been subject to various quality improvement initiatives aimed at reducing errors, including blood product labels that are missing, inaccessible, unreadable, or mismatched to orders and/or patients. This article reports the results of a formal simulation‐based usability test of two comparable technologies designed to reduce blood product administration errors. STUDY DESIGN AND METHODS: Nineteen nurses and three anesthesia providers evaluated one of the two products during simulated use in realistic scenarios during 90‐minute test sessions. Both products required additional learning despite 15 minutes of dedicated vendor‐provided pretest training. RESULTS: There were significant effectiveness differences between the two products, but use of both devices was less efficient than manual checking. Usability issues included poor access to subtasks, lack of process feedback, inadequate error messaging, and confusing device interactions. CONCLUSION: While clinicians' subjective ratings of both devices were similarly high, both products had significant usability issues likely to lead to clinician frustration and workarounds during actual use. This study suggests that usability testing is a valuable and more effective method than preference surveys of determining the ability of blood administration products to meet clinicians' needs in the complex world of patient care.     

Enhancing blood donation intentions using multimedia donor education materials

BACKGROUND: Prior research has shown that education materials that directly address prospective donor concerns and provide specific coping suggestions are particularly effective at enhancing donation attitudes and intentions to give blood. This study compared the effect of donor coping materials, provided in written and audiovisual formats, as potential tools to enhance recruitment of prospective blood donors. The role of initial attitudes toward blood donation on responses to these materials was also considered. STUDY DESIGN AND METHODS: Young adults (62% female; mean [SD] age = 19.1 [1.4]; mean [range] prior blood donations = 1.32 [0‐13]) were randomly assigned to 1) read a brochure addressing common blood donor concerns and suggesting specific coping strategies, 2) view a video addressing blood donor concerns and illustrating coping techniques, 3) read the brochure and view the video, or 4) read a control brochure on healthy eating and exercise. Measures of blood donation attitudes, anxiety, confidence, and intentions to give blood were completed before and after the intervention. RESULTS: Relative to the control brochure, all the intervention groups showed larger reductions in anxiety, more positive changes in attitude, and greater increases in donation confidence and intentions. The combination of the brochure and video outperformed either intervention alone in further improving donation attitudes among participants with high initial donation attitudes. CONCLUSION: Blood donation coping materials, presented in either written or audiovisual formats, significantly enhance willingness to donate blood among young adults regardless of their initial attitudes toward blood donation.     

Pain-related fear and avoidance of physical exertion following delayed-onset muscle soreness

The current study examined the relationship between pain-related fear, physical performance, and pain-related interference in the context of experimentally induced pain to the lower back. Thirty healthy participants completed a test of maximal trunk strength before and after induction of delayed-onset muscle soreness (DOMS) to the trunk extensors. Pain-related fear (Tampa Scale of Kinesiophobia and Pain Anxiety Symptom Scale) was assessed prior to DOMS induction, and measures of current pain and pain-related interference with life activities were obtained 1 day after DOMS induction. As predicted, pain-related fear was not related to strength production prior to DOMS induction. However, following DOMS induction, pain-related fear predicted reduced maximal strength production, individual decrement in maximal strength performance, and increased pain-related interference in life activities. Current pain intensity and anthropometric factors did not contribute significantly to these outcome measures. To our knowledge, this is the first study to identify the impact of pain-related fear on physical performance among a healthy group of individuals following experimental acute low back injury. The findings extend previous research on psychological variables and simulated injury, and suggest that pain-related fear may be an important vulnerability factor in development of disability following acute pain experience.