Book contents
- Intensive Care Medicine
- Intensive Care Medicine
- Copyright page
- Dedication
- Dedication
- Epigraph
- Contents
- Contributors
- Preface
- Foreword
- Abbreviations
- Section 1 Resuscitation and Management of the Acutely Ill Patient
- Section 2 Diagnosis, Assessment, Investigation, Monitoring and Data Interpretation
- Introduction
- The SBAR Tool
- Introduction
- Initial Primary Assessment
- Secondary Assessment
- Continuing Assessment
- Introduction
- Common Immediate Tests
- ECG Modes and Configurations
- Rate
- Cardiac Axis
- Bundle Branch Block
- QT Interval
- Other Abnormalities
- ST Abnormalities and Ischaemic Changes
- Inherited Disorders
- Introduction
- Types of Infection and Related Organisms
- Surveillance
- General Principles of Sampling
- Special Tests – Lumbar Puncture
- Introduction
- Indications for Arterial Blood Gas Samples
- Contraindications
- Sampling Sites
- Technique (Follow Local Hospital Procedure)
- Problems
- Complications
- Potential Sources of Error
- ABG Interpretation
- A Quick Approach to Deciphering the ABG
- Some Caveats
- Stewart’s Physicochemical Approach to Acid–Base
- Plain Film Radiographs (X-ray)
- Computed Tomography
- Magnetic Resonance Imaging
- Radiation
- Introduction
- Challenges of Portable Chest Radiography in ICU
- Systematic Assessment of ICU CXRs
- The ‘LLL’ Approach
- Pneumonia versus Pulmonary Oedema versus ARDS – Which Is It?
- Introduction
- CT Head Anatomy
- Meninges
- CT Checklist: ‘AB BCS’
- Grey–White Matter Differentiation
- CSF Spaces
- Skull/Scalp
- Introduction
- Systematic Assessment of the Abdominal X-ray: BBC
- B: Bones/Soft Tissue
- C: Calcifications/Artefacts
- Abdominal Pathology on CT
- Introduction
- Features of NEWS Scoring Systems
- Updated NEWS 2 Scoring System
- Advantages
- Disadvantages
- Introduction
- Clinical Reasoning and Critical Thinking
- The Clinical Reasoning Process
- Important Steps to Making a Differential Diagnosis
- Acknowledgements
- 2.1 Principles of Obtaining a History
- 2.2 Principles of Performing an Accurate Clinical Examination
- 2.3 How to Undertake Timely and Appropriate Investigations
- 2.4 General Principles of Performing and Interpretation of Electrocardiography Results
- 2.5 General Principles of Obtaining Appropriate Microbiological Samples and Interpretation of Results
- 2.6 Obtaining and Interpretation of Results from Blood Gas Samples (Acid–Base Balance and Disorders)
- 2.7 Principles of Interpreting Imaging Studies (X-ray/CT/MRI)
- 2.8 Imaging of the Chest
- 2.9 Imaging of the Head
- 2.10 Imaging of the Abdomen
- 2.11 Importance of Monitoring and Responding to Trends in Physiological Variables
- 2.12 How to Integrate Clinical Findings with Laboratory Investigations to Form a Differential Diagnosis
- Domain 3 Disease Management: Recognition, Causes and Management
- Section 4 Therapeutic Interventions and Organ Support
- Domain 5 Practical Procedures
- Section 6 Perioperative Care
- Section 7 Comfort and Recovery
- Section 8 End-of-Life Care
- Section 9 Paediatric Care
- Section 10 Transport
- Section 11 Professionalism, Patient Safety, Governance and Health Systems Management
- Index
- References
2.6 - Obtaining and Interpretation of Results from Blood Gas Samples (Acid–Base Balance and Disorders)
from Section 2 - Diagnosis, Assessment, Investigation, Monitoring and Data Interpretation
Published online by Cambridge University Press: 27 July 2023
By
Book contents
- Intensive Care Medicine
- Intensive Care Medicine
- Copyright page
- Dedication
- Dedication
- Epigraph
- Contents
- Contributors
- Preface
- Foreword
- Abbreviations
- Section 1 Resuscitation and Management of the Acutely Ill Patient
- Section 2 Diagnosis, Assessment, Investigation, Monitoring and Data Interpretation
- Introduction
- The SBAR Tool
- Introduction
- Initial Primary Assessment
- Secondary Assessment
- Continuing Assessment
- Introduction
- Common Immediate Tests
- ECG Modes and Configurations
- Rate
- Cardiac Axis
- Bundle Branch Block
- QT Interval
- Other Abnormalities
- ST Abnormalities and Ischaemic Changes
- Inherited Disorders
- Introduction
- Types of Infection and Related Organisms
- Surveillance
- General Principles of Sampling
- Special Tests – Lumbar Puncture
- Introduction
- Indications for Arterial Blood Gas Samples
- Contraindications
- Sampling Sites
- Technique (Follow Local Hospital Procedure)
- Problems
- Complications
- Potential Sources of Error
- ABG Interpretation
- A Quick Approach to Deciphering the ABG
- Some Caveats
- Stewart’s Physicochemical Approach to Acid–Base
- Plain Film Radiographs (X-ray)
- Computed Tomography
- Magnetic Resonance Imaging
- Radiation
- Introduction
- Challenges of Portable Chest Radiography in ICU
- Systematic Assessment of ICU CXRs
- The ‘LLL’ Approach
- Pneumonia versus Pulmonary Oedema versus ARDS – Which Is It?
- Introduction
- CT Head Anatomy
- Meninges
- CT Checklist: ‘AB BCS’
- Grey–White Matter Differentiation
- CSF Spaces
- Skull/Scalp
- Introduction
- Systematic Assessment of the Abdominal X-ray: BBC
- B: Bones/Soft Tissue
- C: Calcifications/Artefacts
- Abdominal Pathology on CT
- Introduction
- Features of NEWS Scoring Systems
- Updated NEWS 2 Scoring System
- Advantages
- Disadvantages
- Introduction
- Clinical Reasoning and Critical Thinking
- The Clinical Reasoning Process
- Important Steps to Making a Differential Diagnosis
- Acknowledgements
- 2.1 Principles of Obtaining a History
- 2.2 Principles of Performing an Accurate Clinical Examination
- 2.3 How to Undertake Timely and Appropriate Investigations
- 2.4 General Principles of Performing and Interpretation of Electrocardiography Results
- 2.5 General Principles of Obtaining Appropriate Microbiological Samples and Interpretation of Results
- 2.6 Obtaining and Interpretation of Results from Blood Gas Samples (Acid–Base Balance and Disorders)
- 2.7 Principles of Interpreting Imaging Studies (X-ray/CT/MRI)
- 2.8 Imaging of the Chest
- 2.9 Imaging of the Head
- 2.10 Imaging of the Abdomen
- 2.11 Importance of Monitoring and Responding to Trends in Physiological Variables
- 2.12 How to Integrate Clinical Findings with Laboratory Investigations to Form a Differential Diagnosis
- Domain 3 Disease Management: Recognition, Causes and Management
- Section 4 Therapeutic Interventions and Organ Support
- Domain 5 Practical Procedures
- Section 6 Perioperative Care
- Section 7 Comfort and Recovery
- Section 8 End-of-Life Care
- Section 9 Paediatric Care
- Section 10 Transport
- Section 11 Professionalism, Patient Safety, Governance and Health Systems Management
- Index
- References
Summary
Key Learning Points
1. Whilst the radial artery is a common sample site, 24–27 per cent of patients will have a negative modified Allen’s test (no/minimal ulnar supply).
2. Remember to expel air and heparin from the syringe to avoid sample contamination.
3. Errors can be associated with sample collection, machine processing and interpretation.
4. Metabolic acidosis can be high anion gap (MUDPILES) or normal anion gap (PANDA RUSH).
5. Stewart’s approach to acid–base disturbance considers the strong ion difference (SID), total weak acid concentration (Atot) and partial pressure of carbon dioxide (PaCO2).
- Type
- Chapter
- Information
- Intensive Care MedicineThe Essential Guide, pp. 37 - 42Publisher: Cambridge University PressPrint publication year: 2021
References
References and Further Reading
Baird, G. Preanalytical considerations in blood gas analysis. Biochemia Medica 2013;23:19–27.CrossRefGoogle ScholarPubMed
Story, D. Stewart acid–base: a simple bedside approach. Anesth Analg 2016;123:511–15.CrossRefGoogle Scholar
Yentis, S, Hirsch, N, Ip, J. Anaesthesia, Intensive Care and Perioperative Medicine A–Z: An Encyclopaedia of Principles and Practice, 6th edn. Edinburgh: Elsevier; 2018.Google Scholar