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Calculate, in litres, the fresh gas flow rate for a 35kg dog with a respiratory rate of 10 bpm, using a circle breathing circuit during maintenance of anaesthesia. 3.5 - 5.25 litres 5.25 - 7.875 litres ›3.5 litres 8.75 - 10.5 litres ›0.35 litres Please select an option Incorrect. Did you calculate the fresh gas flow assuming the circle breathing circuit has a circuit factor of 1 - 1.5? Remember, gas flow is calculated using metabolic oxygen demand of 10ml/kg, which in this patient is 0.35 litres. WikiVet Article: Calculating fresh gas flow. Incorrect. Did you calculate the fresh gas flow assuming the circle breathing circuit has a circuit factor of 1 - 1.5 and the tidal volume was weight multiplied by 15mls? Remember, the circle breathing circuit does not have a circuit factor, gas flow is calculated using metabolic oxygen demandof 10ml/kg, which in this patient is 0.35 litres. WikiVet Article: Calculating fresh gas flow. Incorrect. Did you calculate the fresh gas flow as 100mls/kg? Remember, the circle breathing circuit does not have a circuit factor, gas flow is calculated using metabolic oxygen demand of 10ml/kg, which in this patient is 0.35 litres.WikiVet Article: Calculating fresh gas flow. Incorrect. Did you calculate the fresh gas flow assuming the circle breathing circuit has a circuit factor of 2.5 - 3? Remember, the circle breathing circuit does not have a circuit factor, gas flow is calculated using metabolic oxygen demand of 10ml/kg, which in this patient is 0.35 litres. Also remember that a small animal anaesthetic machine delivers a maximum fresh gas flow of 8 litres so the calculated flow rate would be unachievable. WikiVet Article: Calculating fresh gas flow. Correct! The circle breathing circuit does not have a circuit factor, gas flow is calculated using metabolic oxygen demand of 10ml/kg, which in this patient is 0.35 litres. WikiVet Article: Calculating fresh gas flow.