Acid Base Review

Acid Base Review - Causes : • Lose acid (vomiting or N/G)...

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Understanding Acid/Base Balance Marilyn F. Brown, Nursing Faculty Broad Concepts: Body pH tolerated in very narrow range 7.35 – 7.45 pH is defined as H+ ion concentration The more hydrogen ions, the more ACIDIC pH range roughly compatible with life is 6.8 – 7.8, but that represents a 10-fold difference in H+ ion concentration The primary buffer is bicarbonate (HCO3-
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CO 2 + H 2 0 = H 2 CO 3 = H + HCO LUNGS Kidneys Carbonic Acid Hypoventilation = increased CO 2 Hypervention = decreased CO 2 Requires adequate kidney function
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So……… pH = 7.35 – 7.45 Kidneys regulate the metabolic side of acid base disturbances Kidneys are slow
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Above the pyloric sphincter is ACID Below the pyloric sphincter is BASE
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pH < 7.35 PaCO 2 = 35 – 45 (normal) HCO 3 < 22 METABOLIC ACIDOSIS (base bicarbonate deficit) Causes : lose base (diarrhea) gain acids
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Metabolic Alkalosis (base bicarbonate excess) pH > 7.45 PaCO 2 = 35 – 45 (normal) HCO 3 > 26
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Unformatted text preview: Causes : • Lose acid (vomiting or N/G) • Add base Respiratory Acidosis (carbonic acid excess) pH < 7.35 PaCO 2 > 45 HCO 3 = 22 – 26 (normal) Cause : • Hypoventilation •Poor O 2 CO 2 exchange Respiratory Alkalosis ( carbonic acid deficit ) pH > 7.45 PaCO 2 < 35 HCO 3 = 22 – 26 (normal) Cause : • Hyperventilation • Blow off too much CO 2 Practice Acid/Base Situations Practice Acid/Base Situations pH HCO3 PaCO2 Imbalance Common Causes 7.05 5 38 7.26 24 56 7.62 45 42 7.52 24 30 Don’t Peek! • Try the problems first • Objective: given a set of abg results including pH, PaCO 2 and HCO 3 , student can correctly calculate the imbalance • Will always be uncompensated in Med-Surg I pH HCO3 PaCO2 7.05 5 38 7.26 24 56 7.62 45 42 7.52 24 30 Metabolic Acidosis Respiratory Acidosis Metabolic Alkalosis Respiratory Alkalosis...
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This note was uploaded on 01/12/2011 for the course NUR 211 taught by Professor Marilynf.brown during the Fall '09 term at Harford CC.

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Acid Base Review - Causes : • Lose acid (vomiting or N/G)...

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