El text del capítol 4 ha estat retirat seguint instruccions de l’autorai, en existir participació d’empreses, existir conveni de confidencialidad o existeix la possibilitat de generar patents / El texto del capítulo 4 ha sido retirado siguiendo instrucciones de la autora, al existir participación de empresas, convenio de confidencialidad o la posibilidad de generar patentes. / The text of chapter 4 has been withdrawn on the instructions of the author, as there is participation of undertakings, confidentiality agreement or the ability to generate patent / OBJETIVO: Conocer el método de administración intermitente de un fármaco endovenoso en un servicio de urgencias (SU) y si la retención de fármaco en el equipo de sueroterapia, una vez finalizada la perfusión, repercute sobre la respuesta clínica. MÉTODO: Estudio prospectivo, observacional y descriptivo en una primera fase. En una segunda fase ha sido intervencionista y analítico. Fase 1: análisis de la técnica de perfusión y su repercusión en la respuesta terapéutica sobre el paciente. Fase 2: análisis de la técnica de perfusión intermitente tras acción docente de mejora dirigida al personal de enfermería y su repercusión en la respuesta terapéutica sobre el paciente. Fármaco analizado: Paracetamol 1 g/ev. Variables: edad, sexo, peso, minutos de perfusión, volumen residual post-perfusión en los equipos, escala de dolor y/o temperatura basal (15’, 60’ y 4 horas), concentración plasmática de paracetamol a las 4 horas. Población de estudio: Individuos de ambos sexos mayores de 15 años de edad que acuden al SU y que se les prescribe paracetamol 1 g/ev. RESULTADOS: Se incluye 119 pacientes, 60 durante la 1ª fase y 59 en la 2ª fase. Ninguna perfusión considerada administrada en su totalidad había sido purgada durante la fase 1. El tiempo de administración de la perfusión fue de 25,7 ± 10,9 minutos. La omisión de purga conllevó un volumen residual medio retenido en el sistema de perfusión de 12,6 ± 2,9 ml, alcanzándo una concentración plasmática media de paracetamol de 4,3 ± 5,0 μg/ml, frente a los 5,27 ± 4,42 μg/ml en los casos en los que sí se realizó purga (fase 2). La relación entre concentración de fármaco y la mejoría del dolor se mostró estadísticamente significativa en la medición del mismo a las 4 horas (p = 0,05). El efecto antitérmico no estuvo relacionado con el volumen residual obtenido. CONCLUSIONES: El volumen residual es considerable en los equipos de perfusión y puede tener una repercusión en la respuesta clínica y terapéutica. Consideramos que la práctica de una purga del equipo de sueroterapia es una medida necesaria y debe considerarse su implantación y realización rutinaria. / OBJECTIVES: To determine whether acetaminophen is retained inside intravenous infusion bottles and lives after intermittent administration of fluids in the emergency department and whether such retention has an effect on outcomes. METHODS: Prospective, observational study in the first phase, followed by a second phase to analyze the effect of technical instruction and intervention. In the first phase, the completeness of intravenous administration of medication and the patient’s response to therapy were recorded. In the second phase, after instruction to improve the staff’s technical performance of intravenous infusion of medication, completeness of administration and patient response were again recorded. The medication studied was acetaminophen (1 g) infused through an intravenous line. Variables recorded were age, sex, weight, duration of infusion, residual volume left in the intravenous infusion equipment, score on a pain scale and/or temperature (at 15 minutes, 1 hour, and 4 hours), and plasma concentration of acetaminophen at 4 hours. The study population consisted of male and female emergency department patients aged 15 years or older who were prescribed 1 g of intravenous Acetaminophen. RESULTS: A total of 119 patients were enrolled; 60 were studied in the first phase and 59 in the second. In the first phase, the infusion equipment failed to draim completely in all cases. Intravenous administration took a mean (SD) of 25.7 (10.9) minutes during this phase and omission of a flush maneuver at the end led to leaving a mean residual volume of 12.65 (2.95) mL in the system. The mean plasma concentration of acetaminophen in the first phase (no instruction to flush the line) was 4.28 (5.04) micrograms/mL; in the second phase, after the staff had been instructed to flush the system, the mean plasma concentration was 5,27 (4,42) micrograms/mL. We observed a statistically significant relation between drug plasma concentration and pain relief at 4 hours (P=.05), but no correlation between temperature and residual volume in the equipment. CONCLUSIONS: Considerable volume is left inside intravenous infusion systems, and loss of infusion may affect clinical response and therapy. We believe routine flusing of intravenous infusion system is essential.

Indiana University-Purdue University Indianapolis (IUPUI) / Gastric residual volume (GRV) is a clinical assessment to evaluate gastric emptying and enteral feeding tolerance. Factors such as the tube size, tube material, tube port configuration, placement of the tube in the gastric fluid, the amount of fluid and person completing the assessment may influence the accuracy of residual volume assessment. Little attention has been paid to assessing the accuracy of GRV measurement when the actual volume being aspirated is known, and no studies have compared the accuracy in obtaining RV using the three different techniques reported in the literature that are used to obtain aspirate in practice (syringe, suction, and gravity drainage). This in vitro study evaluated three different methods for aspirating feeding formula through two different tube sizes (10 Fr [small] and 18 Fr [large]), tube materials (polyvinyl chloride and polyurethane), using four levels of nursing experience (student, novice, experienced and expert) blinded to the five fixed fluid volumes of feeding formula in a simulated stomach, to determine if the RV can be accurately obtained. The study design consisted of a 3x2x2x4x5 completely randomized factorial ANOVA (with a total of 240 cells) and 479 RV assessments were made by the four nurse participants. All three methods (syringe, suction and gravity) used to aspirate RV did not perform substantially well in aspirating fluid, and on average, the methods were able to aspirate about 50% of the volume available. The syringe and suction techniques were comparable and produced higher proportions of RVs, although the interrater reliability of RV assessment was better with the syringe method. The gravity technique generally performed poorly. Overall, the polyvinyl chloride material and smaller tubes were associated with higher RV assessments. RV assessment is a variable assessment and the three methods did not perform well in this in vitro study. These findings should be further explored and confirmed using larger samples. This knowledge will be important in establishing the best technique for assessing RV to maximize EN delivery in practice and will contribute to future research to test strategies to optimize EN intake in critically ill patients.

With the rapid somatic growth and development in infants, simultaneous accurate measurements of lung volume and airway function are essential. Raised volume rapid thoracoabdominal compression (RTC) is widely used to generate forced expiration from an airway opening pressure of 30 cmH2O (V30). The (dynamic) functional residual capacity (FRCdyn) remains the lung volume most routinely measured. The aim of this study was to develop comprehensive integrated spirometry that included all subdivisions of lung volume at V30 or total lung capacity (TLC30). Measurements were performed on 17 healthy infants aged 8.6-119.7 weeks. A commercial system for multiple-breath nitrogen washout (MBNW) to measure lung volumes and a custom made system to perform RTC were used in unison. A refined automated raised volume RTC and the following two novel single maneuvers with dual volume measurements were performed from V30 during a brief post-hyperventilation apneic pause: (1) the passive expiratory flow was integrated to produce the inspiratory capacity (IC) and the static (passive) FRC (FRCst) was estimated by initiating MBNW after end-passive expiration; (2) RTC was initiated late during passive expiration, flow was integrated to produce the slow vital capacity (jSVC) and the residual volume (RV) was measured by initiating MBNW after end-expiration while the jacket (j) was inflated. Intrasubject FRCdyn and FRCst measurements overlapped (p = 0.6420) but neither did with the RV (p < 0.0001). Means (95% confidence interval) of FRCdyn, IC, FRCst, jSVC, RV, forced vital capacity and tidal volume were 21.2 (19.7-22.7), 36.7 (33.0-40.4), 21.2 (19.6-22.8), 40.7 (37.2-44.2), 18.1 (16.6-19.7), 40.7 (37.1-44.2) and 10.2 (9.6-10.7) ml/kg, respectively. Static lung volumes and capacities at V30 and variables from the best forced expiratory flow-volume curve were dependent on age, body length and weight. In conclusion, we developed a comprehensive physiologically integrated approach for in-depth investigation of lung function at V30 in infants.

No description available.