APC: Variances in Delivered Tidal Volume

RELATED POST

Adaptive Pressure Control Ventilation: Vigorous Inspiratory Drive

Adaptive Pressure Control Ventilation Interactions with Improving Pulmonary Mechanics

APC Variable Patient Flow Rate

APC Video Series

Adaptive Pressure Control Ventilation: vigorous Inspiratory Drive

RELATED POST

APC: Variances in Delivered Tidal Volume

Adaptive Pressure Control Ventilation Interactions with Improving Pulmonary Mechanics

APC Variable Patient Flow Rate

APC Video Series

APC Variable Patient Flow Rate

RELATED POST
APC: Variances in Delivered Tidal Volume
Adaptive Pressure Control Ventilation: vigorous Inspiratory Drive
APC Interactions with Improving Pulmonary Mechanics

APC Video Series

Adaptive Pressure Control Ventilation Interactions with Improving Pulmonary Mechanics

RELATED POSTS

APC: Variances in Delivered Tidal Volume

Adaptive Pressure Control Ventilation: vigorous Inspiratory Drive

Adaptive Pressure Control Ventilation Video Series

APC Variable Patient Flow Rate

Why I Do Not use Draeger Ventilator Simulators

I get asked often why do I not use other simulators in my videos.
Specifically the Draeger ventilator simulators.
It is very simple, they cannot perform the functions I need to teach modes of ventilation & pulmonary mechanics as demonstrated in the video. 

Adaptive Pressure Control Ventilation Video Series

After finishing my videos on the mathematical models of PC-CMV, I decided to create videos on Adaptive Pressure Control (APC) ventilation.

These videos compare and contrast between APC, VC, & PC during changes in pulmonary dynamics & various patient conditions/ interactions.

My first video in the series (above) overviews what happens when there is a decease in compliance.

RELATED POSTS

APC: Variances in Delivered Tidal Volume

Adaptive Pressure Control Ventilation: vigorous Inspiratory Drive

Adaptive Pressure Control Ventilation Interactions with Improving Pulmonary Mechanics

APC Variable Patient Flow Rate

Incorporating Proportional Assist into Ventilator Protocols

Image 1: PAV+ Work of Breathing bar. 

PAV+ may be used for the initial mode of ventilation during the acute phase of mechanical ventilation. However, from my experience I have had the most success and efficiency with PAV+ utilizing the mode to rest patients after a failed spontaneous breathing trial. After reviewing the literature it is still unclear the best way to wean or liberate a patient from PAV+. However, a traditional T-piece trail has been supported by many peer reviewed journals, so at my institution we still use a 30 minute to one hour T-Piece trial to screen patients for extubation.

How to incorporate PAV+

The Fastest Ambulance on TED

Whats in your pockets? Are you a Prepper or Macgyver?

In a previous post (The RT Hoarder) I mention that I carry very little on me when I'm at work. 

Yes, I believe in being prepared, however I try to practice the "Macgyver" philosophy [1], versus the "Dooms Day Prepper" mentality [2].

This post presents my Everyday Carry (EDC) [3] from when I first started in the field of respiratory therapy to what I carry now. I will describe "what is in my pockets" and why, also notice the progression throughout the years.

What items do I get rid of & what do I always need to practice the profession?

EDC as a RT student & new graduate.

Black Death back on Tour in the American West

Today's PODCAST at All Things Considered (Click Link):

Bubonic Plague Is Back...Small Animals In The American West

Anti-Viral Cocktail for Ebola

October 18 Science Friday Podcast (click link):

Promising New Treatment for the Deadly Ebola Virus

Minute Ventilation as a Function of Inspiratory Time

References

Rob Chatburn's MFV simulator

Journal of Applied Physiology 67 (3) (1982), 1081-1092

RELATED POST

Mathematical Models of PC-CMV: The Relationship of PEEPi to set Frequency

PC-CMV Relationship of Delivered VE & Set Frequency 

Relationship of Frequency to Vt During PC-CMV

Mathematical Models of PC-CMV: Max Vt

The Relationship of I-Time & Mean Airway Pressure

References

Rob Chatburn's MFV simulator

Journal of Applied Physiology 67 (3) (1982), 1081-1092

RELATED POST

Minute Ventilation as a Function of Inspiratory Time 

Mathematical Models of PC-CMV: The Relationship of PEEPi to set Frequency

PC-CMV Relationship of Delivered VE & Set Frequency 

Relationship of Frequency to Vt During PC-CMV

Mathematical Models of PC-CMV: Max Vt

Mathematical Models of PC-CMV: Duty Cycle & Resistance

References

Rob Chatburn's MFV simulator

Journal of Applied Physiology 67 (3) (1982), 1081-1092

RELATED POST

Minute Ventilation as a Function of Inspiratory Time

Mathematical Models of PC-CMV: The Relationship of PEEPi to set Frequency

PC-CMV Relationship of Delivered VE & Set Frequency 

Relationship of Frequency to Vt During PC-CMV

Mathematical Models of PC-CMV: Max Vt

Mathematical Models of Pressure Control Ventilation: The Relationship of PEEPi to set Frequency

References

Rob Chatburn's MFV simulator

Journal of Applied Physiology 67 (3) (1982), 1081-1092

RELATED POST

Minute Ventilation as a Function of Inspiratory Time

Mathematical Models of PC-CMV: Duty Cycle & Resistance

PC-CMV Relationship of Delivered VE & Set Frequency 

Relationship of Frequency to Vt During PC-CMV

Mathematical Models of PC-CMV: Max Vt

High-Fidelity Human Patient Simulators Not Needed: Links to Free Simulators

Image 1 From: http://stateoftomorrow.com/stories/biosafety/stan.htm

Many academic institutions have or are in the process of implementing high-fidelity human patient simulators to augment didactic teachings. Some centers are even using these simulator labs to decrease/reduce the number of hands-on clinical hours.

Personally, I believe these very high cost simulator labs are a scam and more time should actually be focused at bedside with a dedicated clinical preceptor.

Note- my views are from participating in various curriculum's from the schools with very little resources to highly funded skills labs.

My argument against high-fidelity human patient simulators

1.       Cost- the institution has to invest in space, building a simulation lab, lab equipment overhead cost (e.g. electricity, heating & cooling), and staffing. I believe these funds can be better allocated.

2.        No proof- There is little evidence indicating high fidelity simulator labs provide additional benefits versus cheaper methods of simulation (e.g. role playing, actors, etc). Additionally studies supporting the high fidelity labs have been performed by the labs themselves, so I believe there is some biases here.

3.       Hours- many simulator labs you may only visit a few times a semester. When I was attending graduate school we only went to the simulator lab twice a semester. Conversely, in paramedic school we practiced and went over patient assessment skills in every class. Additionally, with simple simulators I can use these anywhere at any time.

4.       Groups- Usually, the simulation lab is a large group exercise with very little individualized hands on experience.

5.       Scenarios- Usually during your scheduled time your group only participates in one scenario. Conversely, with other simulators you can individually go over multiple scenarios in the same amount of time.

Links to Free Simulators to augment your education (Click Hyperlinks)

1.       Draeger Ventilator & Anesthesia Delivery System Simulators: http://www.draeger.com/sites/en_uk/Pages/Hospital/Knowledge%20base.aspx

2.       Hamilton Medical Ventilators. Note this is just a link to their home page, you need to select a specific product to access the simulator: http://www.hamilton-medical.com/products.html

3.       Bronchoscopy simulator: http://kscottrichey.blogspot.com/2011/11/free-bronchoscopy-simulator.html

4.       Robert Chatburn’s Ventilator simulators. My favorite, true mathematical models great for teaching and understanding modes & the variables which influence mechanical ventilation: http://www.mediafire.com/folder/couszp1esabcd/Robert_Chatburn's_Simulators

How the Aurora Shootings Helped Boston Hospitals Prepare for the Marathon Bombing

Image from Prisonplanet.com

Audio Podcast available from NPR's "Here & Now".

Click Link:  Before Marathon Bombings, Aurora Helped Boston Prepare

Mid-Frequency Ventilation (MFV) During Cardiac Ablation Procedure

More information at GMEP Media Gallery (click link): https://gmep.org/media/14474

RELATED POST

The versatility of MFV

The utilization of MFV with a sophisticated transport ventilator

Application of MFV

Waveform of the Week

Waveform of the week 

I posted a patient ventilator asynchrony case on the GMEP Media Gallery.

Here is the link for viewing:

https://gmep.org/media/14733

PC-CMV Relationship of Delivered Minute Ventilation & Set Frequency

Mathematical Review of Pressure Preset Ventilation

Minute ventilation as a function of set frequency with no airflow obstruction. Minute ventilation rises toward a final plateau determined by I-time & resistance. However, compliance determines the rate of the rise of the curves.

RELATED POST

Minute Ventilation as a Function of Inspiratory Time

Mathematical Models of PC-CMV: Duty Cycle & Resistance

Mathematical Models of PC-CMV: The Relationship of PEEPi to set Frequency

Mathematical Models of PC-CMV: Max Tidal Volume

Relationship of Frequency to Tidal Volume During PC-CMV

REFERENCE 
J. Appl Physiology 67 (3) (1982), 1081-1092. 

Relationship of frequency to tidal volume during PC-CMV

Review of Mathematical Principles of Pressure Preset Mechanical Ventilation

This video demonstrates the relationship between set frequency to delivered tidal volume during Pressure control ventilation. Reductions in compliance or increases in frequency decrease delivered VT.

RELATED POST

Minute Ventilation as a Function of Inspiratory Time

Mathematical Models of PC-CMV: Duty Cycle & Resistance

Mathematical Models of PC-CMV: The Relationship of PEEPi to set Frequency

PC-CMV Relationship of Delivered VE & Set Frequency 

Limits of Pressure Control Ventilation: a introduction to the MFV simulator. 

Don't waste my time! Physician Rounds.

Image from: http://house.download-tvshows.com/files/Hugh%20Laurie_1.jpg

Physician rounds, ICU rounds, or multi-disciplinary rounds are very important in the care and treatment of mechanically ventilated patients. It is the only time (usually only once in a 24 hour period) that many specialties can share their concerns, ideas, and goals with the attending intensivist.  The attending physician is very busy, and  responsible for the over-site of many patients, so it is ideal to present your goals during rounds.

I have worked many places and still can't believe how RT's do not attend rounds or do not engage during rounds. These are usually the same RT's that complain that they do not have protocols or that ventilator management is by physician order only. 

"Its your own fault, your NOT allowed to manage the ventilator". 

Why is this patient on mechanical ventilation TODAY?

Photo from: http://theprogressivepatient.wordpress.com/2012/04/22/6/

It is very frustrating when I meet with the ICU staff Respiratory Therapist and ask why is this patient on the ventilator today and I get the following response “they had surgery”, “they coded”, “they had ventilatory failure”, “they have ARDS”, etc. Yet, these events happened hours, days, or even weeks ago, and they are not in the acute stages of their illness anymore.  There is a huge difference between initial indications for mechanical ventilation (MV) versus current goals for MV.

The Infectious Disease Post

Before getting into Respiratory Therapy I was thinking about majoring in microbiology, specifically infectious diseases, so I have taken quite a bit of classes on the subject.

These last few months I have took an interest again on the subject, and have spent my down time researching through books, movies, a mobile game, and even a scavenger hunt.

This post is a hybrid part video/ part text so I would recommend watching the video first.

The references from the video are below:

ZEEP Trial

Zero End-Expiratory Pressure "ZEEP" trial is an alternative to a standard SBT with minimal ventilator settings and/or trach collar or T-piece trials. See video for more information.

RELATED POST/ LINKS

Tobin: minimal PEEP & pressure support during SBT kills some patients

Myth Buster:ventilator weaning should be done on minimal settings (no T-Piece)

Is the T-piece trial futile?

Performing a T-piece trial through the ventilator.

The intrinsic diaphragmatic frequency. 

Mathematical Models of PC-CMV: Max Tidal Volume

RELATED POSTS

Minute Ventilation as a Function of Inspiratory Time

Mathematical Models of PC-CMV: Duty Cycle & Resistance

Mathematical Models of PC-CMV: The Relationship of PEEPi to set Frequency

Relationship of Frequency to Vt During PC-CMV

PC-CMV Relationship of Delivered VE & Set Frequency 

Limits  of Pressure-Control Ventilation: a Introduction to the MFV Simulator. 

Os Gráficos do Ventilador

Os Gráficos do Ventilador

Identificando a Assincronia Paciente-Ventilador e Otimizando as Definições 

AMAZON KINDLE

http://www.amazon.com/Ventilador-Identificando-Assincronia-Paciente-Ventilador-ebook/dp/B00CPBHZUU/ref=sr_1_1?s=books&ie=UTF8&qid=1368070803&sr=1-1

Comparison of 3 Methods to Set T-Low on APRV: REVISTED

RELATED POST

Automatic Setting of T-Low during APRV: Is it beneficial? 

Setting T-Low During APRV to Achieve Lung Protective Goals.

4 Reasons not to use APRV.

Limits of Pressure-Control Ventilation: a Introduction to the Mid-Frequency Simulator

In respiratory therapy school I was never taught about the various mathematical models of pressure-control ventilation (PC-CMV) and we probably only had a hour lecture on respiratory time constants. In clinical rotations PC-CMV was seldom used and had a bad reputation only being used on the sickest patients. This was due to the practice of utilizing  inverse-ratio ventilation in treating patients with ARDS and  serve hypoxia, which led to the administration of neuro-muscular blocking agents and poor outcomes.

Even today many practitioners are unfamiliar with the most versatile mode of ventilation (PC-CMV) and do not know how to optimize the settings. If one wants to have a understanding of the advance modes of ventilation, PC-CMV is were to start.

Assessment of Collateral Circulation of the Hand via Pulse Oximetry

The assessment of collateral circulation of the hand is performed often by surgeons, anesthesiologists, and Respiratory Care Practitioners (Cook, L, 2001; Galvin and Jones, 1989; Gerhring et al, 2002; Raju, 1986; Van de Louw et al, 2001) and Wisely and Cook, 2001). 

Surgeons may use this evaluation before performing a radial artery harvest for coronary artery bypass surgery, Anesthesiologists assess collateral circulation of the hand before arterial cannulation and Respiratory Care Practitioners check the collateral circulation before performing radial artery sticks for blood gas analysis. Each health care professional assesses collateral circulation of the hand for a different reason; however, they all primarily use the same evaluation technique.

Using the Quasi-Static Pressure/Volume Curve to Identify Optimal PEEP & Recruitability

             

In previous post I mention evaluating the static P/V curve to set P-High when using Airway Pressure Release Ventilation (aka. APRV, BiLevel, BiVent) and to set optimal PEEP.

Another advantage of analyzing the static P/V curve is to identify if the patients lungs are recruitable. If they are not recruitable, then they will most likely not respond to higher levels of PEEP or placing them on APRV. 

The above video demonstrates the difference between recruitable & Non-recruitable lungs. 

RELATED POST
APRV: Setting P-High Based on the Static Pressure Volume Curve

Setting PEEP

The Constant Low Flow Method: Utilizing the PB840 part two

Identifying Optimal PEEP with the PB840 Ventilator: the Constant Low Flow Method

Obtaining Plateau Pressures Revisited

I receive many questions in regards to plateau pressure.

What is a plateau pressure?

What is the difference between Peak & plateau pressures?

How do I measure/obtain a plateau pressure measurement?

Are my peak & plateau pressures always equal when using pressure control ventilation?

How do I get a plateau pressure when using PRVC, AutoFlow, or VC+?

My new video (above) describes obtaining plateau pressure when using VC-CMV, PC-CMV, & APC (a.k.a. PRVC, AutoFlow, VC+). 

RELATED POST
A review of Plateau Pressure

A Problem with Plateau Pressure

Why is my Peak & Plateau Pressures the Same? 

3D Printing for Medicine

Floating Exhalation Valve

What is a floating exhalation valve?

What is the difference between a traditional exhalation valve and a floating one?

How do I know if my ventilator has a floating exhalation valve?

See my new video for answers. 

RELATED POST

All Exhalation Valves are not Created Equal

APRV Preview Videos

The above video is an example of the content that is in my new course APRV, BiLevel, BiVent the Utilization of Airway Pressure Release Ventilation.

I posted four additional videos from this course on my YouTube page for review. 

RELATED POST

APRV, BiLevel, BiVent FREE Course

APRV, BiLevel, BiVent FREE course

OFFER HAS EXPIRED

_______________________________________________________________________

My new course is available FREE for the first 10 participants. 

1. Go to the "COURSES" tab on top of this page.
2. Click on the link provided.
3. Use the following coupon code: xab5-1013-sal1-aprv

Dumbing Down Ventilator Taxonomy

In a recent letter to the editor “Ventilatory modes. What’s in a name?”[1] Authors provide a strong argument for the need to standardize terminology in regards to mechanical ventilation and propose an oversimplified classification system specifically for non-invasive ventilatory devices. I applaud the authors for their call to action; conversely their viewpoint is neither novel nor applicable to ventilator taxonomy.

FiO2 Titration Augmented by Artificial Intelligence

I have been a Registered Respiratory Therapist for greater than twelve years and have never considered the titration of oxygen a big deal. Furthermore, practicing at > 10 different facilities in eight different States I have never needed to be prompted by a physician or surveillance system to titrate the FiO2 during mechanical. Fortunately, I have only worked at facilities with respiratory care practitioner driven protocols. So when two recent articles were published on the subject within the last month I took notice [1, 2].