What is the guideline respiratory rate for cats and small dogs when receiving IPPV from a mechanical ventilator?

• A. 6 breaths per minute
• B. 8 breaths per minute
• C. 12 breaths per minute
• D. 15 breaths per minute

Answer: (B)

When delivering IPPV to cats and small dogs, the goal is to maintain normal CO2 levels by balancing how often you ventilate with how much air you put in each breath. A common starting guideline is eight breaths per minute, because this rate, with the usual tidal volumes used in small patients, provides enough alveolar ventilation to clear CO2 without pushing pressures too high or causing overventilation. Use capnography to guide you: keep the end-tidal CO2 in the normal range and adjust the rate or tidal volume as needed to maintain that target. Rates that are much lower can lead to hypercapnia, while rates that are much higher can cause hypocapnia and cardiovascular or pulmonary stress. Always tailor to the individual, but eight breaths per minute is a standard starting point for these patients.