Shadowing Practice: RCoA Primary Examination: SOE Physics Question Example - Learn English Speaking with Video

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Okay, so can you tell me how is heat lost during anaesthesia and surgery?
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Okay, so heat loss.
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Is there a way for a diagram to explain this?
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So you've got the patient on the operating table.
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I'll draw that quickly.
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Now, the main way in which heat is lost in an anaesthetic is through radiation, the infrared radiation, and that counts for 40%.
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Then convection currents count for 30%, whereby warm air is moved away from the body,
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aided by laminar flow and moving heat away from the body that way.
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then a further 15% is lost through evaporation through the energy of latent heat of vaporisation.
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Respiration accounts for approximately 10%
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which can be broken down into 8% for latent heat of vaporisation of the gases and 2% of heating the inhaled gases.
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There is a further small amount of heat lost through conduction through solid services such as the operating theatre
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and through IV fluids into the patient.
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Okay, alright let's come back to this 40% that you described of radiation.
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Can you tell me what factors affect the amount of heat loss through radiation?
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OK, so there's a number of factors.
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The first which is the absolute temperature.
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Stefan Boltzmann gives an equation where...
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OK, don't go into detail of the equation.
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What's the important point about that law?
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So the emissive radiation is proportional to a power of 4, the absolute temperature.
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So therefore the hotter the body is, the greater the temperature loss through that body is.
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The other ways in which heat is lost through radiation, the temperature difference between the body and the surrounding areas, the exposure of the body,
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so the exposure of the patient, then the amount of insulation the body has,
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so if they're wearing blankets or clothing or body fat, will reduce heat loss.
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And lastly, the amount of degree of vasodilation, so that the more vasodilated the patient is, the more blood flow there is to the skin,
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and the greater radiated heat is lost through that.
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OK, all right.
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Let's think about what actually goes on during an anesthetic now.
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So what are the phases of heat loss during anesthetic?
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Is it all lost at the same time?
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Or what happens?
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OK, do I draw a graph?
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Yeah, do.
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So the graph for heat loss, I'll do time in hours at the bottom,
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start at 0, and temperature in Celsius.
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The curve essentially looks like this.
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So in the first hour to two hours, you have rapid heat loss of one to five degrees
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which is accounted for by redistribution of blood and between there
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and the next five hours temperature loss decreases and after which temperature plateaus to a fairly stable level.
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Okay thank you.
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That was a pass for that candidate.
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They were able to show a detailed knowledge coupled with a good understanding of the subject.
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And were able to complement their answer by the use of diagrams and graphs and also the use of an equation.
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Diagrams generally are not compulsory.
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They need to add to the answer rather than just being the answer.
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And occasionally in the exam you will be given an artefact or a diagram already in which to base your answer upon.
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If you choose to use a diagram, it's important that you make them as large as you can, make them clear and relevant to the question you're being asked,
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not just the diagram because you happen to remember it.
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It's also important to use the time whilst you're drawing the diagram to help answer the question.
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Don't draw the diagram and then answer the question.
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The two need to be used at the same time.
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It's also helpful if it looks like it's not the first time you've drawn the diagram.
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Graphs too need to be along the same lines, they need to be labelled and you need to think about whereabouts your line goes on the graph.
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Does it go through the zero point or not, where does it actually fit?
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So in summary that was a well structured answer, able to show knowledge and understanding well and used graphs and diagrams appropriately.
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About This Lesson

In this lesson, you’ll practice understanding and discussing medical concepts related to heat loss during anesthesia, using a video that breaks down key principles, diagrams, and exam strategies. You’ll improve your ability to follow technical dialogue, explain complex ideas clearly, and use visual aids to support your speech—skills that are valuable for both English fluency and academic/professional communication. Perfect for learners aiming to learn English with YouTube while building specialized vocabulary.

Key Vocabulary & Phrases

  • Radiation (n.): The emission of energy as electromagnetic waves, e.g., "Heat loss through radiation accounts for 40%."
  • Convection currents (n.): The movement of warm air away from a body, e.g., "Laminar flow aids convection currents in heat loss."
  • Latent heat of vaporization (n.): The energy required to turn a liquid into a gas, causing cooling, e.g., "Evaporation uses latent heat of vaporization to lose heat."
  • Vasodilation (n.): The widening of blood vessels, increasing blood flow to the skin, e.g., "Vasodilation increases radiated heat loss."
  • Redistribution (n.): The movement of blood between body areas, e.g., "Rapid heat loss in the first hour is due to redistribution of blood."
  • Plateau (v.): To reach a stable level, e.g., "Temperature plateaus after five hours."

Practice Tips

To master the video’s technical tone and pace, use the shadowing technique: Play short clips (5–10 seconds), pause, and repeat the speaker’s words immediately, mimicking their rhythm, stress, and intonation. This helps improve your English pronunciation and ability to follow fast, detailed speech. Focus on phrases like "the curve essentially looks like this" or "the emissive radiation is proportional to a power of 4"—these require clear articulation of multisyllabic words.

For the exam-style dialogue, practice explaining diagrams aloud, as the video suggests. Describe the graph of temperature over time while speaking, linking visuals to words (e.g., "In the first hour, the line drops sharply"). This builds confidence in using visual aids to support your ideas. Remember: Shadow speech isn’t just about repetition—it’s about understanding the message while matching the speaker’s delivery. Over time, you’ll notice improved fluency and clarity when discussing complex topics in English.

What is the Shadowing Technique?

Shadowing is a science-backed language learning technique originally developed for professional interpreter training and popularized by polyglot Dr. Alexander Arguelles. The method is simple but powerful: you listen to native English audio and immediately repeat it out loud — like a shadow following the speaker with just a 1–2 second delay. Unlike passive listening or grammar drills, shadowing forces your brain and mouth muscles to simultaneously process and reproduce real speech patterns. Research shows it significantly improves pronunciation accuracy, intonation, rhythm, connected speech, listening comprehension, and speaking fluency — making it one of the most effective methods for IELTS Speaking preparation and real-world English communication.

Shadowing technique: read the full step-by-step guide →