Plan A Primary: Physics and Equipment

This episode covers different ventilator modes.

Compulsory Mandatory Ventilation Modes:

- Volume Control

- Pressure Control

- The Flow v Time and Pressure v Time Graphs for these

Image of Graphs: www.planaprimary.co.uk/physics/2019/7/19/ventilator-modes

Support Modes:

- SIMV

- Pressure Support

CPAP and PEEP

This episode we're going to cover how we measure blood pressure in clinical practice.

We'll cover the automated and manual BP cuffs, the Finapres system and the arterial line.

We'll also go over the physics behind the Korotkoff sounds.

If you have any questions, comments or requests please email me at [email protected]

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This week we are covering the beast of a topic that is MRI.

We'll cover the basics behind nuclear magnetism, alignment and stimulation.

We will also discuss relaxation times and how different weightings can give us different images.

Finally we will talk about the practical implication of having a patient in the MRI scanner whilst anaesthetised.

If you have any questions, comments or feedback, feel free to email me at [email protected]

All of these episodes are free so please tell everyone who might find them useful. Find more in your podcast player of choice or at my website: www.PlanAPrimary.co.uk

This episode covers the physics behind pulse oximetry. It goes over how we can use the different absorption spectra of oxygenated and deoxygenated haemoglobin to determine their relative concentrations and therefore a saturation.

We then talk about the common issues that we encounter when using pulse oximetry in clinical practice.

A good episode to listen to before this one is Infrared Spectroscopy and Capnography. It covers the principle of infrared absorption in more detail.

If you have any questions or comments, please leave them on the website planaprimary.co.uk or email me at [email protected].

This podcast is completely free, so please share it with anyone who you think might find it useful.

This episode covers the physics behind the pH and Severinghaus electrodes used to measure pH and the partial pressure of carbon dioxide in blood gas machines.

It also covers how we get our bicarbonate and base excess values on blood gas results despite not measuring it directly.

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This episode covers the different methods of measuring oxygen concentration in anaesthetics. We'll cover how oxygen's oxidative properties allow it to be used in electrochemical sensors such as the Fuel Cell and the Clark Polarographic Electrode.

We will also cover how its paramagnetic properties allow it to be measured with the application of a magnetic filed, such as in the null-deflection and pulsed-field paramagnetic analysers.

If you have any questions, comments or would like to request a topic, please email me at [email protected]

Remember, all of these episodes are free, so please share them with anyone who you think would find them useful!

This episode we're covering Infrared Spectroscopy and Capnography.

We'll go over why certain molecules absorb infrared light, the Beer-Lambert Law and some of the key values for the main gases that we measure in anaesthetics.

We'll then cover Capnography equipment and the differences between main stream and side stream analysers.

If you have any questions, comments or requests, please contact me at [email protected]

This episode we're going to cover Humidity: the differences between absolute and relative humidity, it's importance to human physiology, especially in anaesthetics, and how humidity is measured.

We'll then cover the different types of humidifiers and how they work.

If you have any questions, comments or requests, please contact me at [email protected]

This episode we'll cover what LASERs are, the physics behind them, and how they're made.

We'll go over the equipment, including some of the more common lasing mediums, and the safety aspects of laser usage in theatres.

If you have any questions, comments or requests, please contact me at [email protected]

You can find all our episodes online at planaprimary.co.uk

This episode, we'll be talking about how anaesthetic vaporisers work. We will go over the principles of the two main types: variable bypass and measured flow.

Then, we'll delve into the differences between plenum and draw-over vaporisers.

Finally, we'll discuss Desflurane, and why it requires its own special type of vaporiser.

If you have any questions, comments or requests, please contact me at [email protected]

You can find all our episodes online at planaprimary.co.uk