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Eva Nourbakhsh - A Bedside Guide to Mechanical Ventilation

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Eva Nourbakhsh A Bedside Guide to Mechanical Ventilation

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Learning how to use a mechanical ventilator can be very challenging and frightening for most residents and other health care students. Many books and articles have been published on this subject, but they often leave the reader confused because they are generally written for pulmonary/critical care specialists. However, most patients will need the same basic respiratory support and will have similar complications. In this book we provide background information and outline strategies for use of mechanical ventilation to make this advanced patient support easy to understand and apply. Use this handbook to learn the basics about mechanical ventilators and to enhance your ICU experience.

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A Bedside Guide to Mechanical Ventilation First edition April 16 2011 - photo 1

A Bedside Guide to Mechanical Ventilation First edition April 16 2011 - photo 2

A Bedside Guide to Mechanical Ventilation
First edition
April 16, 2011

Copyright 2011 All Rights Reserved

ISBN-10 : 1461102189
E-Book ISBN : 978-1-61397-764-4
EAN-13 : 978-1461102182

Editors

Kenneth Nugent MD
Division Chief: Pulmonary Medicine

Eva Nourbakhsh MD
Internal Medicine Resident

Authors

Jessamy Anderson RN, BSN, CCRN, Reza Anvari MD, Gilbert Berdine MD, Cihan Cevik MD, Frederick Hugh Pharm D, Rahul Mishra DO, Eva Nourbakhsh MD, Kenneth Nugent MD, Rishi Raj MD, Rosemary Salazar RRT

Texas Tech University Health Sciences Center, Lubbock
Department of Internal Medicine, Division of Pulmonary Critical Care Medicine
3601 4th Street Stop 9410, Lubbock TX 79416
Phone: (806)743-3155. Fax (806)743-3148.

Acknowledgments

We thank Connie Nugent for editorial assistance and advice on design and page layout.

DISCLAIMER

THIS HANDBOOK IS INTENDED FOR INFORMATION AND REFERENCE USE ONLY.

The information provided is designed to help residents and other health care practitioners understand basic concepts about mechanical ventilation. It is not intended as a substitute for mechanical ventilation textbooks, clinical experience, or clinical judgment. Sources used for this handbook are believed to be reliable and accurate. Efforts were made to include the latest evidence-based recommendations. However, the accuracy and completeness of the information cannot be guaranteed. Therefore, this handbook should be used as a guide and NOT as the only source of information for individual patient care. This handbook is sold as is without warranties of any kind, express or implied, and all involved with creation and publication of this handbook disclaim any liability, loss, or damages which may arise therefrom.

Contents

Key ideas
Kenneth Nugent MD

Respiratory physiology
Reza Anvari MD

Oxygen therapy
Kenneth Nugent MD

Indications for mechanical ventilation
Eva Nourbakhsh MD

Ventilator basics
Eva Nourbakhsh MD

Ventilator display and functions
Rosemary Salazar RRT, Eva Nourbakhsh MD

Modes of ventilation
Eva Nourbakhsh MD

Quick ventilator setup
Eva Nourbakhsh MD, Kenneth Nugent MD

Use of PEEP
Eva Nourbakhsh MD, Kenneth Nugent MD

Auto-Peep
Eva Nourbakhsh MD

Airway pressure release ventilation (APRV)
Rishi Raj MD

Salvage strategies for severe refractory hypoxemia
Kenneth Nugent MD

Non-invasive ventilation
Reza Anvari MD

Positive pressure ventilation effects on cardiac function
Cihan Cevik MD

Comprehensive care of the ventilated patient
Kenneth Nugent MD

Daily check list for clinicians
Kenneth Nugent MD

RT daily duties in the ICU
Rosemary Salazar RRT

Routine nursing care for ventilator patients
Jessamy Anderson RN, BSN, CCRN

Respiratory drugs used in ventilated patients
Gilbert Berdine MD

ICU sedation and pain management
Frederick Hugh Pharm D

Common events and emergencies
Rishi Raj MD

Troubleshooting blood gases
Eva Nourbakhsh MD

Troubleshooting pressure alarms
Eva Nourbakhsh MD

Weaning
Kenneth Nugent MD

Complications of mechanical ventilation
Eva Nourbakhsh MD

Ventilator-associated pneumonia
Kenneth Nugent MD

Tracheostomy
Gilbert Berdine MD

Long term consequences of mechanical ventilation
Rahul Mishra DO

Annotated bibliography of selected studies by the ARDS Network
Kenneth Nugent MD

Short case reviews
Rishi Raj MD

Answers to cases
Rishi Raj MD

Glossary
Eva Nourbakhsh MD, Kenneth Nugent MD

Appendix
Eva Nourbakhsh MD, Kenneth Nugent MD

  1. Most patients who require mechanical ventilation do well with the assist-control mode.
  2. Patients with acute lung injury and acute respiratory distress syndrome have better outcomes with a low tidal volume, low plateau pressure ventilation strategy.
  3. Nurses should keep the head of the bed elevated and monitor gastric residuals. These precautions reduce the frequency of ventilator-associated pneumonia.
  4. Combinations of benzodiazepines and narcotics probably provide optimal patient comfort during mechanical ventilation. Nurses should use a standardized scoring system to titrate the patients response to sedation protocols. Physicians and nurses should make frequent efforts to wean sedation, and it should be interrupted daily.
  5. Physicians and respiratory therapists should make frequent efforts to reduce FiO2 and should use the ARDS Network Table for FiO2 and PEEP combinations.
  6. The initial treatment for ventilator-associated pneumonia should provide broad spectrum antibiotic coverage for multidrug resistant hospital-acquired pathogens. De-escalation of this therapy is appropriate when cultures results are available.
  7. Physicians should review the patients weaning potential daily. Spontaneous breathing trials and weaning parameters help make optimal decisions about extubation.
  8. Immediate physiologic changes do not always reflect long term benefit or harm for the patient. The clinician should be flexible and at times allow pH to be lower or CO2 to be higher. Clinical judgment is important.

Study question

Based on your reading or your clinical experience list three ideas which are likely important in the care of every patient on a mechanical ventilator.

Respiratory Drive Controllers

Central chemoreceptors

Located in the medulla.

Respond to changes in pH of CSF.

Mechanism: Picture 3CO2 in arterial blood Picture 4crosses the blood brain barrierPicture 5 in CSF, CO2 combines with H2O Picture 6 produces H+ + HCO3-.

Picture 7H+ acts in central chemoreceptors causing hyperventilation via vagus nerve stimulation.

Picture 8CSF pH causes hyperventilation which decreases CO2 in blood.

Peripheral chemoreceptors

They are located at bifurcation of common carotid arteries above and below the aortic arch. They act through three different mechanisms.

Picture 9arterial pO2 (<60 mm Hg) Picture 10activation of chemoreceptors Picture 11 hyperventilation.

Picture 12arterial pO2Picture 13 partial inactivation of chemoreceptors Picture 14 normal ventilation.

Picture 15arterial H+Picture 16activation of carotid bodies at bifurcation Picture 17 hyperventilation to correct pH.

Lung stretch receptors

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