The effects of different syringe volume, needle size and sample volume on blood gas analysis in syringes washed with heparin

Introductıon:

We evaluated the effect of different syringe volume, needle size and sample volume on blood gas analysis in syringes washed with heparin.

Materials and methods:

In this multi-step experimental study, percent dilution ratios (PDRs) and final heparin concentrations (FHCs) were calculated by gravimetric method for determining the effect of syringe volume (1, 2, 5 and 10 mL), needle size (20, 21, 22, 25 and 26 G) and sample volume (0.5, 1, 2, 5 and 10 mL). The effect of different PDRs and FHCs on blood gas and electrolyte parameters were determined. The erroneous results from nonstandardized sampling were evaluated according to RiliBAK’s TEa.

Results:

The increase of PDRs and FHCs was associated with the decrease of syringe volume, the increase of needle size and the decrease of sample volume: from 2.0% and 100 IU/mL in 10 mL-syringe to 7.0% and 351 IU/mL in 1 mL-syringe; from 4.9% and 245 IU/mL in 26G to 7.6% and 380 IU/mL in 20 G with combined 1 mL syringe; from 2.0% and 100 IU/mL in full-filled sample to 34% and 1675 IU/mL in 0.5 mL suctioned sample into 10 mL-syringe. There was no statistical difference in pH; but the percent decreasing in pCO₂, K⁺, iCa²⁺, iMg²⁺; the percent increasing in pO₂ and Na⁺ were statistical significance compared to samples full-filled in syringes. The all changes in pH and pO₂ were acceptable; but the changes in pCO₂, Na⁺, K⁺ and iCa²⁺ were unacceptable according to TEa limits except fullfilled-syringes.

Conclusions:

The changes in PDRs and FHCs due nonstandardized sampling in syringe washed with liquid heparin give rise to erroneous test results for pCO₂ and electrolytes.     

Transient heat conduction in an anisotropic medium in cylindrical coordinates

Three dimensional, time dependent heat conduction for an anisotropic medium of a triclinic system is solved for an infinitely long hollow or solid cylinder of finite radius with a restriction ε₂₃ = ε₁₂ε₁₃. Several special cases are obtained from the present solution.     

Learning teacher-research-mentoring: stories from Turkey

The continuing developmental process of learning mentoring, specifically regarding supporting teacher research, has received relatively little attention in fields such as English language teaching, and this qualitative case study addresses the gap. It explores how three teacher-research-mentors, who were experienced classroom practitioners but novices in research-mentoring, grew into their new role while supporting teacher research projects in different English language higher education contexts in Turkey over a one-year period. Vignettes reveal that they became conscious of needing to provide psychological support to sustain teacher-researchers’ motivation from starting their research projects to completing them successfully, presenting findings and writing them up, and that they also developed in other roles, but as subject-specialists sharing knowledge about research to a lesser extent. Outcomes, in terms of the quality of research produced by the teacher-researchers in their contexts, appeared influenced by the different characteristics of their institutions and the degree of external support in the form of mentor-mentoring the teacher-research-mentors could access. Given the increasing interest around the world in teacher research as an empowering form of professional development, there is a growing need for teacher-research-mentors, and these findings, through shedding light on research-mentors’ developmental needs, might be of interest to teacher educators.     

Raising the language awareness of pre‐service English teachers in an EFL context

This study investigates the challenges that non‐native pre‐service English teachers (Haluk, Gaye, Selin, Öznur and Serkan) experience in their target language use when they do their practicum in actual language classrooms. This study found that the common difficulties the student teachers encounter related to certain grammatical structures, explaining unknown words to students, modifying language according to students’ level, and authenticity of the classroom language. During this study, the target language awareness training session was offered by the university supervisor in order to improve the student teachers’ target language use in the classroom. The training sessions included classroom observations, feedback sessions, semi‐structured interviews, retrospective protocols and discussion meetings with the student teachers. The findings indicated that the language awareness training had a positive impact on the target language use of the pre‐service English teachers. Furthermore, this study discusses the curriculum and the requirements of the language teacher education programme in an EFL setting and makes suggestions for the professional development of non‐native pre‐service language teachers.     

Academic Mobbing in Relation to Leadership Practices: A New Perspective on an Old Issue

Abstract

Constant pressures emanating from internal and external environments of the academy have resulted in many changes, one of which is the workplace mobbing, an old issue for the broader field of organization science but a relatively new phenomenon in the academic context. This study investigated the relationship between workplace mobbing and academic leadership and the results indicated that the more positive leadership there is in an institution, the less mobbing behaviors are observed.     

Informal Science Educators: Understanding Their Goals for Preschool-Aged Audiences

Research in Science Education - Informal science educators’ (ISEs) work with young children has received limited attention in the literature. We investigated ISEs’ goals for...     

An analysis of the educational value of low-fidelity anatomy models as external representations

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Validity of the X-factor computation methods and relationship between the X-factor parameters and clubhead velocity in skilled golfers

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Toward making the invisible visible using a scale: prospective teachers' thoughts and affective reactions to feedback

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Promoting field trip confidence: teachers providing insights for pre-service education

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