Respiratory Nuts and Bolts
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About this ebook
This exciting new book is a culmination of every class I have been asked to teach for the nursing population. For the first time you can get all of this popular material in one book. It is an easy to understand approach to many of the respiratory functions nursing is expected to be cross trained in. This book contains all of the material in "Mechanical Ventilation Made Easy" which has had international success. Chapters include: Respiratory Review; Assessment Skills; Respiratory Disease; Oxygen and Oxygen Deliver; Respiratory Therapy Treatments; Respiratory Failure and Airway Management; Introduction to Mechanical Ventilation; Modes of Mechanical Ventilation; Arterial Blood Gases.
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Respiratory Nuts and Bolts - Michael Fischer
Introduction
Professional development is the process of acquiring the knowledge and skills needed to be proficient in a chosen career field. The first component of professional development is typically a good, scholastic education consisting of high school and often times collegiate-level classes. The field you choose to practice in will determine how much education is required to gain an entry-level position into the workforce.
The second phase of professional development occurs when you have obtained your entry-level position and have arrived for your first day of work. This phase is often referred to as on-the-job training.
Many impromptu discussions have been held around the water cooler regarding how best to prepare someone for the workforce. Some argue that a well-rounded education is the cornerstone of proficiency in the workplace. Others claim that it isn’t until someone experiences the real
world before they find out what they are made of. They will make a case that once you are out of school, the real education begins.
Many textbooks are thrust upon you at the collegiate level. Most textbooks are similar in how they are constructed. Oh sure, the topic changes from book to book, but the overall way the book is laid out is pretty much the same. This book is different.
The on-the-job training approach is designed to combine both levels of professional development into one. It is written as if you just showed up for your first day of work. The content is the content you would be receiving while on the job. This approach takes out much of the fluff,
which the typical textbook covers, and provides you with the substance that employers want you to know.
In no way am I telling you that your other textbooks are not a valuable resource, nor will this book be a substitution to the collegiate textbooks you already have or will obtain. This book will be an invaluable tool to you because, as you read through, you will get a true understanding of what a typical workday in your new career may look like. You will get a sense of what will be expected from you and what you can expect from the profession you work in.
Respiratory Nuts and Bolts is designed to be a small part of your on-the-job training as you enter the medical field. As a respiratory therapist of many years (no, I’m not going to tell you how long I’ve been at this...just let the gray hairs be a guide), I have been asked repeatedly to give certain classes about respiratory to non-respiratory personnel as they begin their medical careers. This is needed as some of the respiratory responsibilities do cross over to other professions. It all depends on the facility in which you work, but those responsibilities that cross over will be greater in some places than in others.
Not every facility will provide you with the best cross-training
program, so instead of waiting for the reliability of that first job’s training session, this book is intended to give you a head start in the knowledge that you will need to have in this field.
Through my years of working as a respiratory therapist, I have been able to develop quite an extensive amount of training for mainly nurses and resident physicians. I am taking all of the classes I teach on a regular basis and putting them in this book for you.
You will probably not need to know every topic that I cover. This will be dependent on where in the hospital you choose to work. Time can be saved if you skip to the chapters that pertain to your particular interest. The other chapters might be valuable to you later down the road if you choose to change your career path in the medical field.
It is my hope that you find this book to be a valuable resource to your library while you advance in your career of choice.
Respiratory Review
My intention in this chapter is to give you a review of some of the important aspects of the respiratory system. I could certainly spend a great deal of time going into depth on many of these topics, but that would be counter intuitive to what I am trying to achieve, which is a quick and basic guideline. I feel there are highlights that should be covered, items of importance that will surface later in this text.
Anatomy and Physiology
The structures of the respiratory system and how they work are vast and complex. There are certain key points I want you to think about as we learn how to care for our pulmonary patient.
The primary function of the respiratory system is to provide oxygen to the tissues of the body and to eliminate carbon dioxide. It is absolutely vital that we always keep this primary function in mind. Everything we do for our patient is centered on this premise. Its definition is quite simple, but its application can get very complicated.
External respiration: is the process of bringing oxygen from the atmosphere into the lungs, and then through the process of diffusion, having that oxygen cross over from the alveoli into the blood stream. Subsequently, this process also includes carbon dioxide diffusing from the blood stream into the alveolus of the lung and then out into the atmosphere.
Internal respiration: is the process of gas exchange between the blood and the tissues. Again, oxygen leaves the blood and enters the tissues as the carbon dioxide exits the tissues and accesses the bloodstream. You may also hear this referred to as cellular respiration.
Many problems can occur to prevent a patient’s adequate gas exchange. The barrier can be related to an external respiratory problem, such as an obstructed airway. At other times, it can be an internal respiratory problem, such as in cyanide toxicity. When our patient is having issues, either from poor oxygenation or an elevated carbon dioxide level, we must attempt to identify where the problem lies. There are different strategies for correcting each set of problems, which I will discuss later.
The upper airways: again, there are many components to the upper airways, but what I want to focus on is their function. The main function, of course, is to act as a conduit for air to travel from the atmosphere to the lower airways. However, along this course, the upper airways provide some extremely vital functions for the health and well-being of our lungs and body as a whole: they heat, humidify, and filter the inspired air.
Yes, the upper airways do even more than this. These three functions, however, are key when it comes to some of the modalities we will use later to treat our patient.
The muscles of respiration: The primary muscles of respiration are the diaphragm and the intercostals. There are many other smaller/accessory muscles of ventilation that I won’t bore you with right now. The important point to take away from here is in regard to the assessment of our patient. During normal respiration, the diaphragm and the intercostals work quietly while doing their job. In viewing this type of patient, you will note that there is very little chest rise or fall. When someone is struggling to breathe, often times they will enlist the help of the accessory muscles. You may notice the shoulders rising and falling, which are known as intercostal retractions.
The lobes of the lungs: The right lung has three lobes (upper, middle, and lower), while the left has two lobes (upper and lower).
The alveolar-capillary membrane (aka a-c membrane or blood-gas barrier): This membrane separates the alveoli from the bloodstream. It is the area where gas exchange takes place. Understanding the concept of gas exchange can help us when trying to correct problems via mechanical ventilation.
Mechanics of Ventilation
In a nutshell, this is the process of breathing. We breathe in; we breathe out. I know, I’m a genius, right? As I stated when I mentioned the primary function of respiration, the concept is easy, but the process can be difficult. It is important that you understand certain terminology as we proceed with this text.
Tidal volume: This is the amount of air, usually measured in ml, that moves in and out of the lungs in a given breath. The purpose of this tidal volume breath is to move oxygen into the body and carbon dioxide out of the body. The size of the tidal volume breath will vary, depending on the changing needs of the body. While during exercise, for example, the tidal volume breaths will increase to keep up with the metabolic demands of the body.
Respiratory rate: The number of breaths a person takes in a given minute. Again, this value will change depending on the demands of the body.
Minute ventilation: This is how much air is moving in and out of the lungs in a given minute, usually measured in ml. Mathematically speaking, it is the respiratory rate multiplied by the tidal volume.
Minute Ventilation = tidal volume x respiratory rate
Since the purpose of respiration or ventilation is basically the process of gas exchange, it is considered effective when CO2