For 2–3 hour dentals in 5 kg dogs, I pre-oxygenate for 3 minutes, place a 4.0–4.5 ETT, and rely on capnography, Doppler (cuff about 40% limb circumference), and active warming to keep MAP >= 65 and ETCO2 35–45. When ETCO2 creeps during scaling, do you adjust the ventilator first or dial back the vapor to keep a smooth plane without chasing numbers?
@OP With 4.0–4.5 ETTs I bump RR first; vapor only if MAP <65.
I notch the posterior acrylic on 10 mm Hyrax; ‘8:02 a.m.’ calls stopped. Green dot on the key yet?
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When ETCO2 creeps during scaling, I rule out artifact first — swap the sampling line, empty the water trap, and confirm the cuff seal; capno can lie when it’s sipping scaler runoff. Then I nudge ventilation (tiny RR increase or a brief switch to pressure-control) before touching vapor, unless MAP softens or I see breath-stacking. @OP do you notice it coincides with water pooling near the ETT tip or the capno line?
Switched to 14‑micron erythritol in the AirFlow for perio‑maintenance on greyhounds — less bleeding and cleaner cementum on exposed roots when I drop pressure to about 2.0 bar and keep bursts under 3 seconds. I do a quick two‑tone pass, but I rinse it off after 15–20 seconds so it doesn’t muddy visibility; @dwilson03’s longer sit time felt sticky for me. Caveat: on heavy calculus or stubborn stain I still grab glycine or a low‑power piezo first.
I nudge minute ventilation first — bump RR by 2 and/or VT by about 1 ml/kg — then, if MAP starts to soften, trim iso by 0.1–0.2% so you still “keep MAP >= 65 and ETCO2 35–45” without yo‑yoing. A tiny PEEP (3 cmH2O) and easing the mouth gag can improve V/Q and airflow in these 5 kg pups, like tapping the thermostat before rewiring the house. Curious whether you’re on pressure‑control or volume‑control here, @OP.