Short-term effects on outcomes related to the mechanism of intervention and physiological outcomes but insufficient evidence of clinical benefits for breathing control: a systematic review

QUESTIONS: What is the volume, quality, consistency, and generalisability of the evidence for breathing control? What is the effect on outcomes related to the target and mechanism of breathing control, as well as physiological and clinical outcomes? DESIGN: Systematic review with meta-analysis. PARTICIPANTS: People with chronic respiratory disease, post-surgical, or asymptomatic individuals. INTERVENTION: Breathing control (relaxed basal, diaphragmatic, or abdominal breathing) as the sole intervention. OUTCOME MEASURES: All outcome measures providing continuous data. RESULTS: Twenty studies were included within the meta-analysis. A beneficial effect was found for abdominal movement (SMD 1.36, 95% CI 0.42 to 2.31), diaphragm excursion (SMD 1.39, 95% CI 1.00 to 1.77), respiratory rate (SMD -0.84, 95% CI -1.09 to -0.60), tidal volume (SMD 0.98, 95% CI 0.71 to 1.25), arterial oxygen saturation (SMD 0.63, 95% CI 0.25 to 1.02) and percutaneous oxygen (SMD 1.48, 95% CI 0.85 to 2.11). Breathing control had a detrimental effect on the work of breathing (SMD 1.06, 95% CI 0.52 to 1.60) and dyspnoea (SMD 1.47, 95% CI 0.88 to 2.05). CONCLUSION: When used as a sole intervention, there was a beneficial effect on outcomes related to the mechanism of breathing control as well as on short-term physiological outcomes. In people with severe respiratory disease, breathing control resulted in a detrimental effect on dyspnoea and work of breathing. There was no clear evidence of an effect on ventilation or long-term physiological outcomes related to gas exchange or the energy cost of breathing. Overall, evidence was satisfactory with studies demonstrating poor consistency, good generalisability, and satisfactory volume and quality.     

Concordance of respiratory care plans generated by protocols from different hospitals: a comparative study

OBJECTIVE: To assess whether respiratory care protocols from different hospitals result in similar care plans for identical patients, we asked: 1. Does applying respiratory care protocols from different hospitals to standardized patient vignettes produce identical care plans? 2. If there are differences in the care plans produced, what is the extent of the difference, and for which modalities are the differences greatest? 3. Does installing the protocol in a computerized information management system to generate the respiratory care plan improve the level of agreement? 4. Do protocols from different hospitals agree with regard to indications for respiratory care treatments and use of the Clinical Practice Guidelines from the American Association for Respiratory Care? METHODS: Protocols were compared by applying each of 4 hospitals' protocols to 15 patient vignettes that we developed, with various respiratory problems. With each vignette, 3 experienced respiratory therapist evaluators developed respiratory care plans, using both a manual (paper-based) and a computer-aided approach. RESULTS: The overall degree of agreement among the 4 protocols was moderate (kappa 0.60, 95% confidence interval 0.46-0.71). The degree of concordance differed for the individual respiratory care modalities; concordance was generally highest for oxygen, aerosol delivery, and pulse oximetry, and was lower for bronchopulmonary hygiene and hyperinflation. Concordance regarding indications for therapy also differed among the modalities; concordance was greatest for the indications for incentive spirometry, bronchodilator use, and pulse oximetry. The concordance of care plans developed with the computer-aided approach resembled that of the manual approach (kappa 0.62, 95% confidence interval 0.45-0.77). CONCLUSIONS: Our results suggest moderate agreement between care plans generated with respiratory care protocols from different hospitals. The sources of differences included differences in the indications for therapy, different degrees of protocol compliance with the American Association for Respiratory Care Clinical Practice Guidelines, and subjectivity in the indications for therapy. This study identifies opportunities to lessen regional variation in respiratory care, by encouraging uniform application of protocols and evidence-based guidelines.     

The effect of photobiomodulation using low-level laser therapy on tooth sensitivity after dental bleaching: a systematic review

Lasers in Medical Science - The authors aimed to conduct a systematic review to assess data from the current literature on the effectiveness of low-level laser therapy (LLLT) in preventing tooth...     

Video Modeling and Video Feedback to Reduce Time to Perform Intravenous Cannulation in Medical Students: A Randomized-Controlled Mixed-Methods Study

Combined video modeling (VM) and video feedback (VF) may be more beneficial than traditional feedback when teaching procedural skills. This study examined whether repeated VM and VF compared with VM alone reduced the time required for medical students to perform peripheral intravenous (IV) cannulation. Twenty-five novice medical students were randomly assigned to groups in a one-way blinded embedded mixed-methods study to perform IV cannulation. Participants received standardized instruction and performed IV cannulation on each other while being audio-video recorded. They were assigned to review a video of an expert performing IV cannulation (VM alone), or both the expert video and a video of their own most recent IV cannulation (VM+VF), before returning to perform another IV cannulation. This was repeated for a total of four IV cannulation encounters and three video reviews. A post-test interview was also conducted and analyzed qualitatively using thematic content analysis. The median [interquartile range] time required to perform IV cannulation in the final encounter was significantly different between the VM+VF group vs VM alone group (126 [93-226] sec vs 345 [131-537] sec, respectively; median difference, 111 sec; 95% confidence interval, 8 to 391; P = 0.02). There was no significant difference in IV cannulation success between VM alone and VM+VF in the final encounter (75% vs 85% respectively; P = 0.65). For the VM+VF group, the time to perform IV cannulation was reduced after the final encounter compared with the baseline encounter (P = 0.002), which was not true of the VM alone group (P = 0.35). Video modeling and feedback shortened time to IV skill completion, reduced complications, and improved satisfaction in novice medical students.     

Childhood Bone Mineral Content Is Associated With Methylation Status of the RXRA Promoter at Birth

Maternal vitamin D deficiency has been associated with reduced offspring bone mineral accrual. Retinoid‐X receptor‐alpha (RXRA) is an essential cofactor in the action of 1,25‐dihydroxyvitamin D (1,25[OH]₂‐vitamin D), and RXRA methylation in umbilical cord DNA has been associated with later offspring adiposity. We tested the hypothesis that RXRA methylation in umbilical cord DNA collected at birth is associated with offspring skeletal development, assessed by dual‐energy X‐ray absorptiometry, in a population‐based mother‐offspring cohort (Southampton Women's Survey). Relationships between maternal plasma 25‐hydroxyvitamin D (25[OH]‐vitamin D) concentrations and cord RXRA methylation were also investigated. In 230 children aged 4 years, a higher percent methylation at four of six RXRA CpG sites measured was correlated with lower offspring bone mineral content (BMC) corrected for body size (β = ?2.1 to ?3.4 g/SD, p = 0.002 to 0.047). In a second independent cohort (n = 64), similar negative associations at two of these CpG sites, but positive associations at the two remaining sites, were observed; however, none of the relationships in this replication cohort achieved statistical significance. The maternal free 25(OH)‐vitamin D index was negatively associated with methylation at one of these RXRA CpG sites (β = ?3.3 SD/unit, p = 0.03). Thus, perinatal epigenetic marking at the RXRA promoter region in umbilical cord was inversely associated with offspring size–corrected BMC in childhood. The potential mechanistic and functional significance of this finding remains a subject for further investigation. © 2014 American Society for Bone and Mineral Research.     

Patient- and Provider-Reported Information about Transplantation and Subsequent Waitlisting

Because informed consent requires discussion of alternative treatments, proper consent for dialysis should incorporate discussion about other renal replacement options including kidney transplantation (KT). Accordingly, dialysis providers are required to indicate KT provision of information (KTPI) on CMS Form-2728; however, provider-reported KTPI does not necessarily imply adequate provision of information. Furthermore, the effect of KTPI on pursuit of KT remains unclear. We compared provider-reported KTPI (Form-2728) with patient-reported KTPI (in-person survey of whether a nephrologist or dialysis staff had discussed KT) in a prospective ancillary study of 388 hemodialysis initiates. KTPI was reported by both patient and provider for 56.2% of participants, by provider only for 27.8%, by patient only for 8.3%, and by neither for 7.7%. Among participants with provider-reported KTPI, older age was associated with lack of patient-reported KTPI. Linkage with the Scientific Registry for Transplant Recipients showed that 20.9% of participants were subsequently listed for KT. Patient-reported KTPI was independently associated with a 2.95-fold (95% confidence interval [95% CI], 1.54 to 5.66; P=0.001) higher likelihood of KT listing, whereas provider-reported KTPI was not associated with listing (hazard ratio, 1.18; 95% CI, 0.60 to 2.32; P=0.62). Our findings suggest that patient perception of KTPI is more important for KT listing than provider-reported KTPI. Patient-reported and provider-reported KTPI should be collected for quality assessment in dialysis centers because factors associated with discordance between these metrics might inform interventions to improve this process.