El plomo, uno de los metales más utilizados por el hombre desde la antigüedad, se caracteriza por ser un metal blando, dúctil, maleable y de gran resistencia a la corrosión. Estas características ...permiten que se pueda trabajar con herramientas manuales de uso común. Las emplomaduras permiten resolver de una forma singularmente duradera las uniones de los elementos meta?licos con las estructuras de fa?brica a las que se anclan. La deformabilidad y la densidad del plomo permiten absorber la transmisión de ondas y las tensiones transmitidas por los movimientos y cambios de volumen del hierro sin que se transmitan a las fa?bricas y sin que e?stas lleguen a fisurarse. A pesar de estas propiedades, se trata de un material en desuso. Este texto presenta un recorrido histórico de su empleo en construcciones históricas y describe tanto sus cualidades como sus técnicas de uso.
Extending the access to cardiopulmonary resuscitation (CPR) training to a wider public is an important step in increasing survivability of out-of-hospital cardiac arrest. However, often price and ...maintenance of CPR manikins are barriers that prevent training at schools. This study aims to evaluate the learning of hands-only (HO) CPR by practicing with a low-cost manikin (LoCoMan) with visual qualitative feedback and to compare the results with the skills acquired by practice on a conventional manikin. A quasi-experimental study with 193 schoolchildren (10 to 12 years old) who were allocated to two groups: the LoCoMan group was taught via an integrative approach (science combined with physical education (PE)) and practiced on a handmade manikin, and a control group practiced in a traditional setting with a commercial manikin (Resusci Junior, Laerdal, Norway). All participants practiced for 1 hands-on skill session before performing a post-test on an instrumented CPR manikin. The outcomes including HO-CPR performance variables were compared between groups. The LoCoMan and control groups both achieved acceptable percentage of HO-CPR quality (57% and 71%, p = 0.004). Among 6th-graders, there were no significant differences in HO-CPR quality between LoCoMan 68% and control 71%, p = 0.66. The control group achieved better chest compression depth while the LoCoMan group showed more compressions with adequate chest recoil. Conclusion: Schoolchildren are able to build and use a low-cost manikin with visual feedback. The integrative learning approach used in this study may be a feasible alternative methodology for training and learning HO-CPR in schools when commercial manikins are not available. What is Known: • Access to CPR training should be universal and independent of age, location, financial means, or access to qualified instructors. • Scientific societies promote the implementation of CPR in schools, so that teachers and schoolchildren can play a multiplier role in their environment, but the gap in CPR learning is related to cultural, economic factors or access to resources and materials. What is New: • LoCoMan may be a useful device for teaching and learning CPR in schoolchildren from the age of 10 and upwards. • LOCOMAN shows that it is feasible and possible to build a low-cost manikin (about €5 in the European Region) and to integrate it into an integrative educational project, and outlines how this could be done. this approach can be an incentive for teachers to attempt teaching CPR, but also for education outside the formal environment.
ObjectiveGamification is a non-evaluation and competition-based training methodology with high emotional involvement. The goal of this study was to evaluate gamification methodology as compared with ...other existing methodologies when teaching cardiopulmonary resuscitation (CPR) to secondary school students.Methods489 secondary school students from two high schools in Spain participated in this randomised-block quasi-experimental study in February 2018. The students were classified into different groups. Each group received CPR training with a different methodology: GAM (gamification-based training as a compulsory but non-tested academic activity to learn by playing in teams, with instructor and visual feedback); EVA (training based on subsequent evaluation as a motivational incentive, with instructor and visual feedback); VFC (visual feedback complementary, training based on a non-compulsory and non-tested academic activity, with instructor and visual feedback); TC (traditional complementary, training based on a non-compulsory and non-tested academic activity, with instructor feedback). After a week, each student performed a 2 min hands-only CPR test and quality of CPR was assessed. Visual feedback in training and CPR variables in test were provided by the QCPR Instructor App using a Little Anne manikin, both from Laerdal (Norway).ResultsGAM (89.56%; 95% CI 86.71 to 92.42) methodology resulted in significantly higher scores for CPR quality than VFC and TC (81.96%; 95% CI 78.04% to 85.88% and 64.11%; 95% CI 58.23 to 69.99). GAM (61.77%; 95% CI 56.09 to 67.45) methodology also resulted in significantly higher scores for correct rate than VFC and TC (48.41%; 95% CI 41.15% to 55.67% and 17.28%; 95% CI 10.94 to 23.62). 93.4% of GAM methodology participants obtained >50 mm of compression mean depth which was a significantly higher proportion than among students in VFC and TC (78.0% and 71.9%). No differences between GAM and EVA were found. A confidence level of 95% has been assigned to all values.ConclusionsGAM methodology resulted in higher CPR quality than non-tested methods of academic training with instructor feedback or visual feedback. Gamification should be considered as an alternative teaching method for Basic Life Support (BLS) in younger individuals.
Lifeguard teams carry out their work in extremely hot conditions in many parts of the world. The aim of this study was to analyze the impact of high temperatures on physiological parameters during ...cardiopulmonary resuscitation (CPR).
A randomized quasi-experimental cross-over design was used to test physiological lifesaving demands (50 min acclimatization +10 min CPR) in two different thermal environments: Thermo-neutral environment (25 °C) vs Hyperthermic environment (37 °C).
The data obtained from 21 lifeguards were included, this covers a total of 420 min of resuscitation. The CPR performance was constantly maintained during the 10 min. The Oxygen uptake (VO 2) ranged from 17 to 18 ml/min/kg for chest compressions (CC) and between 13 and 14 ml/min/kg for ventilations (V) at both 25 °C and 37 °C, with no significant difference between environments (p > 0.05). The percentage of maximum heart rate (%HR max) increased between 7% and 8% at 37 °C (p < 0.001), ranging between 75% and 82% of HR max. The loss of body fluids (LBF) was higher in the hyperthermic environment; LBF: (37 °C: 400 ± 187 g vs 25 °C: 148 ± 81 g, p < 0.001). Body temperature was 1 °C higher at the end of the test (p < 0.001). The perceived fatigue (RPE) increased by 37° an average of 2 points on a scale of 10 (p = 0.001).
Extreme heat is not a limiting factor in CPR performance with two lifeguards. Metabolic consumption is sustained, with an increase in CC, so V can serve as active rest. Nevertheless, resuscitation at 37 °C results in a higher HR, is more exhausting and causes significant loss of fluids due to sweating.
Control of massive hemorrhage (MH) is a life-saving intervention. The use of tourniquets has been studied in prehospital and battlefield settings but not in aquatic environments.
The aim of this ...research is to assess the control of MH in an aquatic environment by analyzing the usability of two tourniquet models with different adjustment mechanisms: windlass rod versus ratchet.
A pilot simulation study was conducted using a randomized crossover design to assess the control of MH resulting from an upper extremity arterial perforation in an aquatic setting. A sample of 24 trained lifeguards performed two randomized tests: one using a windlass-based Combat Application Tourniquet 7 Gen (T-CAT) and the other using a ratchet-based OMNA Marine Tourniquet (T-OMNA) specifically designed for aquatic use on a training arm for hemorrhage control. The tests were conducted after swimming an approximate distance of 100 meters and the tourniquets were applied while in the water. The following parameters were recorded: time of rescue (rescue phases and tourniquet application), perceived fatigue, and technical actions related to tourniquet skills.
With the T-OMNA, 46% of the lifeguards successfully stopped the MH compared to 21% with the T-CAT (P = .015). The approach swim time was 135 seconds with the T-OMNA and 131 seconds with the T-CAT (P = .42). The total time (swim time plus tourniquet placement) was 174 seconds with the T-OMNA and 177 seconds with the T-CAT (P = .55). The adjustment time (from securing the Velcro to completing the manipulation of the windlass or ratchet) for the T-OMNA was faster than with the T-CAT (six seconds versus 19 seconds; P < .001; effect size ES = 0.83). The perceived fatigue was high, with a score of seven out of ten in both tests (P = .46).
Lifeguards in this study demonstrated the ability to use both tourniquets during aquatic rescues under conditions of fatigue. The tourniquet with the ratcheting-fixation system controlled hemorrhage in less time than the windlass rod-based tourniquet, although achieving complete bleeding control had a low success rate.
The aim of this study was to compare the quality of standard infant CPR with CPR in motion (i.e., walking and running) via performing maneuvers and evacuating the infant from a beach. Thirteen ...trained lifeguards participated in a randomized crossover study. Each rescuer individually performed three tests of 2 min each. Five rescue breaths and cycles of 30 chest compressions followed by two breaths were performed. Mouth-to-mouth-and-nose ventilation was carried out, and chest compressions were performed using the two-fingers technique. The manikin was carried on the rescuer’s forearm with the head in the distal position. The analysis variables included compression, ventilation, and CPR quality variables, as well as physiological and effort parameters. Significantly lower compression quality values were obtained in running CPR versus standard CPR (53% ± 14% versus 63% ± 15%; p = 0.045). No significant differences were observed in ventilation or CPR quality. In conclusion, lifeguards in good physical condition can perform simulated infant CPR of a similar quality to that of CPR carried out on a victim who is lying down in a fixed position.
The aim of the study was to compare the quality of CPR (Q-CPR), as well as the perceived fatigue and hand pain in a prolonged infant cardiopulmonary resuscitation (CPR) performed by lifeguards using ...three different techniques. A randomized crossover simulation study was used to compare three infant CPR techniques: the two-finger technique (TF); the two-thumb encircling technique (TTE) and the two-thumb-fist technique (TTF). 58 professional lifeguards performed three tests in pairs during a 20-min period of CPR. The rescuers performed compressions and ventilations in 15:2 cycles and changed their roles every 2 min. The variables of analysis were CPR quality components, rate of perceived exertion (RPE) and hand pain with numeric rating scale (NRS). All three techniques showed high Q-CPR results (TF: 86 ± 9%/TTE: 88 ± 9%/TTF: 86 ± 16%), and the TTE showed higher values than the TF (p = 0.03). In the RPE analysis, fatigue was not excessive with any of the three techniques (values 20 min between 3.2 for TF, 2.4 in TTE and 2.5 in TTF on a 10-point scale). TF reached a higher value in RPE than TTF in all the intervals analyzed (p < 0.05). In relation to NRS, TF showed significantly higher values than TTE and TTF (NRS minute 20 = TF 4.7 vs. TTE 2.5 & TTF 2.2; p < 0.001). In conclusion, all techniques have been shown to be effective in high-quality infant CPR in a prolonged resuscitation carried out by lifeguards. However, the two-finger technique is less efficient in relation to fatigue and hand pain compared with two-thumb technique (TF vs. TTF, p = 0.01).
El plomo, uno de los metales más utilizados por el hombre desde la antigüedad, se caracteriza por ser un metal blando, dúctil, maleable y de gran resistencia a la corrosión. Estas características ...permiten que se pueda trabajar con herramientas manuales de uso común. Las emplomaduras permiten resolver de una forma singularmente duradera las uniones de los elementos meta?licos con las estructuras de fa?brica a las que se anclan. La deformabilidad y la densidad del plomo permiten absorber la transmisión de ondas y las tensiones transmitidas por los movimientos y cambios de volumen del hierro sin que se transmitan a las fa?bricas y sin que e?stas lleguen a fisurarse. A pesar de estas propiedades, se trata de un material en desuso. Este texto presenta un recorrido histórico de su empleo en construcciones históricas y describe tanto sus cualidades como sus técnicas de uso.
ObjectiveTo compare the effectiveness of 4-month rolling-refreshers and annual retraining in basic life support (BLS) on a sample of schoolchildren.DesignProspective longitudinal trial.Setting and ...participantsFour hundred and seventy-two schoolchildren (8–12 years old).InterventionsSchoolchildren were instructed in BLS and then split into the following three groups: control group (CG), standard group (SG) and rolling-refresher group (RRG). Their BLS skills were assessed within 1 week (T1) and 2 years later (T2). Moreover, CG did not receive any additional training; SG received one 50 min retraining session 1 year later; RRG participated in very brief (5 min) rolling-refreshers that were carried out every 4 months.Primary and secondary outcomesHands-on skills of BLS sequence and cardiopulmonary resuscitation.ResultsBLS sequence performance was similar in all groups at T1, but SG and RRG followed the steps of the protocol in more proportion than CG at T2. When compared at T2, RRG showed higher proficiency than SG in checking safety, checking response, opening the airway and alerting emergency medical services. In addition, although the mean resuscitation quality was low in all groups, RRG participants reached a higher percentage of global quality cardiopulmonary resuscitation (CG: 16.4±24.1; SG: 25.3±28.8; RRG: 29.9%±29.4%), with a higher percentage of correct chest compressions by depth (CG: 3.9±11.8; SG: 10.8±22.7; RRG: 15.5±26.1 mm).ConclusionsIn 8-to-12-year-old schoolchildren, although annual 50 min retraining sessions help to maintain BLS performance, 4-month very brief rolling-refreshers were shown to be even more effective. Thus, we recommend implementing baseline BLS training at schools, with subsequently brief rolling-refreshers.
Foreign body airway obstruction (FBAO) is a relatively common emergency and a potential cause of sudden death both in children and older people; bystander immediate action will determine the victim’s ...outcome. Although many school children’s basic life support (BLS) training programs have been implemented in recent years, references to specific training on FBAO are lacking. Therefore, the aim was to assess FBAO-solving knowledge acquisition in 10–13-year-old school children. A quasi-experimental non-controlled simulation study was carried out on 564 ten-to-thirteen-year-old children from 5 schools in Galicia (Spain). Participants received a 60-min training led by their physical education teachers (5 min theory, 15 min demonstration by the teacher, and 30 min hands-on training) on how to help to solve an FBAO event. After the training session, the school children’s skills were assessed in a standardized adult’s progressive FBAO simulation scenario. The assessment was carried out by proficient researchers utilizing a comprehensive checklist specifically designed to address the variables involved in resolving a FBAO event according with current international guidelines. The assessment of school children’s acquired knowledge during the simulated mild FBAO revealed that 62.2% of participants successfully identified the event and promptly encouraged the simulated patient to cough actively. When the obstruction progressed, its severity was recognized by 86.2% and back blows were administered, followed by abdominal thrusts by 90.4%. When the simulated victim became unconscious, 77.1% of children identified the situation and immediately called the emergency medical service and 81.1% initiated chest compressions. No significant differences in performance were detected according to participants’ age.
Conclusion
: A brief focused training contributes to prepare 10–13-year-old school children to perform the recommended FBAO steps in a standardized simulated patient. We consider that FBAO should be included in BLS training programs for school children.
What is Known:
• Kids Save Lives strategy states that school children should learn basic life support (BLS) skills because of their potential role as first responders.
• This BLS training does not include content for resolving a foreign body airway obstruction (FBAO).
What is New:
• Following a 60-min theoretical-practical training led by physical education teachers, 10–13-year-old school children are able to solve a simulated FBAO situation.
• The inclusion of FBAO content in BLS training in schools should be considered.
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