Description: Segment 1 Credits followed by rolling intertitles explaining the principles of the carbon dioxide absorption technique. The two methods in use are demonstrated diagrammatically. Firstly: single-phase absorption is shown. The principle of absorption is illustrated using diagrams showing how to avoid excess carbon dioxide forming in the apparatus. Intertitle: Demonstration of a canister. One type is shown being filled with soda-lime. The canister is made airtight by the anaesthetist blowing excess air out (the dust which arises is readily visibile) and then filling the canister with water. The canister it taped and a spare is shown. Time start: 00:00:00:00 Time end: 00:04:47:18 Length: 00:04:47:18 Segment 2 Intertitle: Single phase absorption. (i) Apparatus. The canister is tubed up, attached to the mask and re-breathing bag. A female patient is briefly shown. Intertitle: Single phase absorption. (ii) Induction. This example shows a patient induced with nitrous oxide and ether. When the required level of anaesthesia is reached, the carbon-dioxide canister is added to the circuit and the nitrous-oxide-ether reduced. The anaesthetist has to observe the patient's breathing bag carefully to monitor the patient's air supply. The anaesthetist touches the canister as the narrator explains that it can get very hot from the chemical reaction. Time start: 00:04:47:18 Time end: 00:08:10:00 Length: 00:03:13:06 Segment 3 Intertitle: Closed circuit or two-phase absorption. (i) Principle. This method is explained diagrammatically. Closed circuit or two-phase absorption (ii) Apparatus. The equipment is demonstrated. An anaesthetist points out the relevant equipment as the narrator explains how it works. The gases are shown circulating around the cylinder or bottle and then back to the re-breathing bag. Time start: 00:08:10:00 Time end: 00:12:00:00 Length: 00:03:50:00 Segment 4 The expiratory value is shown. The valves are demonstrated. lntertitle: Closed circuit or two-phase absorption. (iii) Control of circuits. A flow diagram showing the methodology for using closed-circuit anaesthesia is shown. Closed circuit or two-phase absorption. (iv) Induction. The anaesthetist is shown screwing the canister into place, then the patient is induced using nitrous-oxide-ether. Exact dosage of each gas is described. The patient is now fully anaesthetised. The other gases are adjusted. Time start: 00:12:00:00 Time end: 00:16:30:00 Length: 00:03:30:00