Acid Base RLO

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					Acid Base RLOs
                         H       H
                             O
    Mouse Ears:
 A Work in Progress
     Jennifer Dandrea
  University of Nottingham
Background
• Teaching advanced physiology of critical care to
  nurses
  – Scenarios include common situations that occur on
    the wards
  – Aim of course is to explain and revise the underlying
    pathophysiology
  – Regardless of branch, examples always seemed to
    include acidosis and respiratory compensation
• Soon realised that “a few background slides”
  would not be enough
  – Most of lecture spent explaining acids, bases and
    associated topics – not what lecture time was
    intended for!
Realisation of a Need
• Explanation of acids and bases immediately took
  far too long in the lecture
  – Only intended as a few refresher slides
• Basic knowledge was missing from even
  experienced nurses
  – They knew the symptoms and what to do but didn’t
    really understand why
• If post-reg nurses are lost then pre-reg nurses
  are certain to be lost as well!
  – There was a definite need for a dedicated, easy to
    access RLO
Example Lecture Info:
Definitions
• Acid
   – Any substance that donates H+
   – Increases H+ concentration and  pH (<7)
• Base
   – Any substance that accepts a H+
   – Decreases H+ concentration and  pH (>7)
• Alkali
   – Any substance that, in solution, donates OH-
   – The OH- combine with the H+ producing H20
      • Same end-point as a base: free H+ removed and  pH
 Neutral
   pH=7


                               H+      OH-


                                           H
                 H                 H
               H                       O
                 O
                       H                       H
                           O                       O
                               H               H

                O- H   H               H
                                           O H
                           OH


Litmus paper           Beaker
 Acid
pH=1 - 6.9


                                       H+      OH-


                                                       H
                 H         H           H H O                   H
               H
                 O
                               H                           H
                                   O               H
               H       H               H
                   H                       H                   H
                       H       H                   H
                                                       O H
                                   OH
               H           H                   H               H

Litmus paper                   Beaker
 Basic/Alkaline
pH=7.1 - 14


                                   H+   OH-

                   H       H
                               O            H
                   O                H
                                        O

               H           H                        O
                   O           O
                                        O       H
                                    H
                           H
                       O       H            H
                                   OH           O H


Litmus paper                   Beaker
pH value:     pH value:     pH value:     pH value:


         7             2             7             12
                       H+


                       H+
H             H             H             H
    O-            O-            O-            O-
                       H+


H             H        H+   H             H
    O-            O-            O-            O-
                       H+

H             H             H             H
    O-            O-   H+       O-            O-

         H+            H+            H+
H             H             H             H
    O-            O-            O-            O-
         H+            H+            H+


         H+            H+            H+
H             H             H             H
    O-            O-            O-            O-
         H+            H+            H+

H        H+   H        H+   H        H+   H
    O-            O-            O-            O-

         H+            H+            H+
H             H             H             H
    O-   H+       O-   H+       O-   H+       O-    H+
UCeL Workshop 2004
• Dawn came to Nottingham to kick start RLO
  ideas
• I worked as part of a small group to devise an
  outline
  – Several of us realised that we all wanted to teach the
    same subject as background
  – We were from different disciplines but had a common
    need
  – Had a very helpful student on board too
• I ended up holding the baby!
  – Enthusiasm is a dangerous thing...
  Initial Spec.
• Lots of ideas…
   – … quite hard to make
     them fit the standard
     template!
• Ended up with an
  “individual” document
• Realised assessments
  would have to run
  throughout the RLO, not
  just clustered at the end
   – Students must
     understand one section
     before moving on to the
     next
 From there…
• A specification was written for an acid-base RLO
• Realised that it was actually two RLOs
  – One to explain the basic concept
  – One to further explain concepts…
• They were peer reviewed by co-authors of initial
  workshop specification
  – At June Wolfson weekend specifications were finalised
  – Peer reviewed by pharmacists who had not previously
    encountered the RLOs before
  – Also bagged a (freelance engineer) developer at
    Cambridge
… to here
• An Introduction to Acids and Bases
  – www-
    g.eng.cam.ac.uk/mmg/paul/ucel/acid_base_intro/


• Even more on Acids and Bases
  – www-
    g.eng.cam.ac.uk/mmg/paul/ucel/acid_base_further_a
    p/

• These are works in progress

				
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posted:4/7/2010
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