arterial blood gas sampling and analysis: radial approach
DESCRIPTION
Arterial Blood Gas Sampling and analysis: Radial Approach. Presented by: Jonna Bobeck BSN, RN, CEN. Objectives. Understand ABG Discuss indications Describe contraindications for performing an arterial puncture. Demonstrate the technique for performing an arterial puncture. - PowerPoint PPT PresentationTRANSCRIPT
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Arterial Blood Gas Sampling and analysis:
Radial Approach
Presented by:Jonna Bobeck BSN, RN, CEN
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Objectives
• Understand ABG
• Discuss indications
• Describe contraindications for performing an arterial puncture.
• Demonstrate the technique for performing an arterial puncture.
• Analyze and interpret results
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Introduction
• ABG sampling
• Information with limitations
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Indications
• Determination of pH and partial pressure of respiratory gases
• Determination of other serum blood levels
• Assessment of patient response to therapeutic interventions
• Assessment of progression of disease process
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Contraindications
• Coagulopathy, anticoagulant meds, thrombolysis
• Abnormalities of the overlying skin
• Prior vascular surgery at or proximal to the entry site
• Inadequate circulation
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The Allen Test
• Assess collateral circulation
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Equipment
• Gloves
• Antiseptic solution
• Syringe
• 1% lidocaine (optional)
• 1.5-inch 22 to 23 guage needle
• Specimen bag with ice
• Syringe cap
• Bandage
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Anatomy of Radial Artery
• Preferred site• Superficial location• Relatively immobile
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Procedure
• Explain procedure
• Universal precautions
• Prepare region
• Local anesthetic: optional
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Procedure: Initial Artery Approach
• Allen test
• Position
• Identify artery
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Specimen Collection
• Slowly advance
• Blood will fill syringe spontaneously
• If unsuccessful withdraw and redirect
• Prepare specimen for submission to lab
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Post Procedure Care
• Apply direct pressure
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Complications
• Hematoma
• Distal ischemia
• Pseudoaneurysm
• Localized trauma
• Infection
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Where are abg kits kept in the ed?
Trauma 2
Dirty Utility
Supply Pyxis
Materials
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A modified Allen's test is only required for patient’s with poor circulation?
True
False
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If unsuccessful withdraw to epidermis and redirect?
True
False
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Place the abg on ice and tube to lab?
True
False
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Sorryplease walk to lab
and no ice if delivered in less than 15 minutes
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Happy nurses and patient make for an awesome shift?
Absolutely
Not Really
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Analysis
• Part of diagnosis
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Overview
• pH (7.35 – 7.45)
• PaCO2 (35 – 45)
• PaO2 (80 – 100)
• HCO3 (23 – 27)
• Respiratory buffer response
• Renal buffer response
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Acid base disorders
• Respiratory acidosis
• Respiratory alkalosis
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Acid base disorders
• Metabolic acidosis
• Metabolic alkalosis
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Components of ABG
• pH
• PaO2
• PaCO2
• HCO3
• Base Excess (B.E.)
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Steps to Interpretation: ABG town
1. Look at pH to determine the first and last name of your ABG
2. Look at CO2 and HCO3 to determine which one has same last name
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FIRST MIDDLE LAST
Compensated Respiratory AcidosisUncompensated Metabolic Alkalosis
pHUncompensated Acid…………..7.35 --- 7.45……………Uncompensated Alk
CO2 Respiratory AcidRespiratory Alkalosis………………35 – 45………………Respiratory Acidosis
HCO3 Metabolic BaseMetabolic Acidosis………………….23 – 27………………Metabolic Alkalosis
Compensated Gases7.35…………………………….......7.40/7.41………………………………..7.45 Compensated Acidosis Compensated Alkalosis
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Example One
Jane Doe is a 45 year-old female admitted
to the nursing unit with a severe asthma
attack. She has been increasing shortness
Of breath since admission three hours ago.
Her arterial blood gas result is as follows:
pH – 7.22
CO2 – 55
HCO3 – 25
B.E - 23
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Result
• First name – uncompensated
• Last name – acidosis
• Look at CO2 and HCO3 to determine which one has the same last name
• CO2 – 55 (acidosis)
• Uncompensated respiratory acidosis
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Example Two
John Doe is a 55 year-old male admitted to
your Emergency Department with a bowel
Obstruction. He has been experiencing
intractable vomiting for the last several
hours. His arterial blood gas result is as follows:
pH – 7.50
CO2 – 42
HCO3 – 33
B.E. - 26
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Result
• First name – uncompensated
• Last name – alkalosis
• Look at CO2 and HCO3 to determine which one has the same last name
• HCO3 – 33 (alkalosis)
• Uncompensated metabolic acidosis
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Compensation
• Over time the body attempts to compensate
• Uncompensated, partially compensated, fully compensated
• When the CO2 or HCO3 go in the opposite direction of the pH there is compensation by that system
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A Bit harder
• pH = 7.36 PaCO2 = 56 HCO3- = 26
• pH = 7.43 PaCO2 = 32 HCO3- = 29
• pH = 7.35 PaCO2 = 31 HCO3- = 18.1
• pH = 7.19 PaCO2 = 45 HCO3- = 18.1
• pH = 7.44 PaCO2 = 47 HCO3- = 26
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The prefix to the name
• pH = 7.09 PaCO2 = 50 HCO3- = 30
• pH = 7.21 PaCO2 = 55 HCO3- = 28
• pH = 7.67 PaCO2 = 60 HCO3- = 45
• pH = 7.45 PaCO2 = 33 HCO3- = 20
• pH = 7.01 PaCO2 = 20 HCO3- = 10
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O2 and base excess
• pH 7.34, PCO2 34, HCO3- 18.6, BE -6, PO2 86%
• pH 7.58, PCO2 48, HCO3 48, BE +22, PO2 59%
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Mrs. Smith is a 65 year-old woman who is in your ED with decreased level of consciousness. Her ABG results:
pH – 7.28 PCO2 – 74 HCO3 - 26What is the acid base
disturbance?
Respiratory Acidosis Respiratory Alkalosis
Metabolic Acidosis Metabolic Alkalosis
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Is Her ABG Compensated or Uncompensated?
Compensated
Uncompensated
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What test is used to assess collateral circulation prior to
obtaining an ABG?
Semmes-Weinstein Test
The Allen Test
The Snuffbox Test
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Indications for obtaining an ABG?
Determination of other serum blood levels
Determination of pH and partial pressure of respiratory gases
Assessment of patient response to therapeutic interventions
Assessment of progression of disease process
All the above
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The preferred site for arterial puncture?
Femoral
Brachial
Radial
Ulnar
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True or False: during specimen collection blood will auto fill the
syringe?
True
False
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Post procedure how long do you apply direct pressure to
puncture site?
10 Minutes
5 MinutesJust apply dressing
30 seconds
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Mr. J is in trauma 6 with a history of
IDDM. His ABG results: pH – 7.25 PCO2 – 35 HCO3 - 38
What is this acid base disturbance?
Respiratory Acidosis
Metabolic Alkalosis
Respiratory Alkalosis
Metabolic Acidosis
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Is the ABG Compensated or Uncompensated?
Compensated
Uncompensated
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Ph 7.48 PCO2 15 HCO3 25What is the acid base disturbance
Respiratory Acidosis
Metabolic AlkalosisMetabolic Acidosis
Respiratory Alkalosis
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Is the ABG Compensated or Uncompensated?
Compensated
Uncompensated
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pH – 7.56 PCO2 – 42 HCO3 - 46
What is this acid base disturbance?
Respiratory Acidosis
Metabolic Alkalosis
Respiratory Alkalosis
Metabolic Acidosis
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Is the ABG Compensated or Uncompensated?
Compensated
Uncompensated
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pH – 7.48 PCO2 – 16 HCO3 - 26
What is this acid base disturbance?
Respiratory Acidosis
Metabolic Alkalosis
Respiratory Alkalosis
Metabolic Acidosis
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Is the ABG Compensated or Uncompensated?
Compensated
Uncompensated
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pH – 7.38 PCO2 – 50 HCO3 - 27
What is this acid base disturbance?
Respiratory Acidosis
Metabolic Alkalosis
Respiratory Alkalosis
Metabolic Acidosis
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Is the ABG Compensated or Uncompensated?
Compensated
Uncompensated
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pH – 7.50 PCO2 – 35 HCO3 - 32
What is this acid base disturbance?
Respiratory Acidosis
Metabolic Alkalosis
Respiratory Alkalosis
Metabolic Acidosis
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Is Her ABG Compensated or Uncompensated?
Compensated
Uncompensated
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references
• Corning, HS & Bryant, SL. Mosby’s Respiratory Care PDQ. Mosby, 2005.
• Hennessey, I & Japp, A. Arterial blood gases made easy. Churchill Livingstone, 1st edition. 2007.
• Hogan, MA & Wane, D. Fluids, electrolytes, and acid –base balance. Pearson Education, Inc., 1st edition. 2003.
• Malley, WJ. Clinical blood gases: Assessment & Intervention. Saunders, 2nd edition. 2004.
• Morton, PG, Fontaine, DK, Hudak, CM, Gallo, BM. Critical care nursing: A holistic approach. Lippincott, Williams, and Wilkins, 8th edition. 2005.
• Oakes, D. Arterial blood gas pocket guide. Respiratorybooks.com. 2009.
• Springhouse. Respiratory care made incredibly easy. Lippincott, Williams & Wilkins. 2004.