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Got it. I was confused because it being chemically inert has no relevance on whether or not giving too much can have physiologic effects, and it says nothing about its safety profile. There are plenty of substances that do not undergo metabolism that have physiologic impacts in our body. Just look at the inert gases...just because its inert doesn't mean you can huff radon at will without it having any impact.
I didn't mean for it to come off as me making assumptions about what you said, so sorry if it did.
So let me preface this by saying that I don't know if you are someone who gives 200 mg to everyone regardless of weight/depth of paralysis since you didn't explicitly say that. I know people that do, and that is the main practice that I have an issue with. If you adjust based on a patient's depth of paralysis or their weight, great. But again, many of our colleagues don't.
In your example, you pose the hypothetical that IF the patient had 1 twitch instead of 2, then yes, >2 mg/kg would be advisable. The point I am making is that you have a way to see how many twitches the patient has. If the patient has 2, give 2 mg/kg. If they have only 1, then increase the dose. If the patient has 0, 200 mg may not be enough and you may need to give more. I'm not sure if you are someone who doesn't routinely check twitches before dosing sugammadex (I personally know several), but if you are, you are blindly giving a dose without having any idea where your starting point is. Additionally, in your example, you used a 75 kg male. What if the patient is a 45 kg lady? Suddenly you're at 4.4 mg/kg and the amount of free molecule floating around has suddenly increased dramatically.
The risk is definitely NOT less clear. I don't understand why you are downplaying and even leaving out some of the potential complications associated with it. Here is a paper that was published in the past year that goes over the risks in a little more detail than you presented, and lists several other risks. I recommend you give it a read: The potential risks of sugammadex
I'll highlight a couple of lines for you: "The potential risks presented above are dose-dependent and more frequent with the free-form of sugammadex. Therefore, it is better to avoid using more than the optimal dose of the drug...Therefore, the anesthesiologists should pay more attention to prevent overdose of sugammadex...anesthesiologists need to be cautious about the potential risks until further evidence is accumulated."
I would caution you to not alter your anesthesia practice based on the ****ty practice of others. As you said, you have no idea how many of these patients were being reintubated for any number of other reasons. And those that were being reintubated for residual neuromuscular blockade, how many were dosed appropriately with sugammadex? Without actually knowing that information, these numbers are meaningless.
Again, until we have evidence to show that patients are getting reparalyzed despite sugammadex being dosed appropriately in the appropriate patient (e.g.: given rocuronium, not ESRD, etc), I am going to trust the clinical trials that the manufacturer did that enrolled thousands of patients vs anecdotal evidence that others have.
They do dose escalation and de-escalation studies to find the optimal dose. Maybe they did round up? But as you said, it is all conjecture and neither of us know the answer to that question.
Too soon 😱
But joking aside, the reason you haven't given 3 mg of Zofran is because the 4 mg dose is what was studied by the manufacturer and it is what is recommended by the manufacturer. https://www.novartis.us/sites/www.novartis.us/files/zofran_inj.pdf
Overall I just feel like checking twitches takes all of 5 seconds, and dose adjusting takes another 5 seconds. All in all, you have spent 10 seconds to mitigate any potential complication from overdosing a drug that we are still learning about.
I push zofran over one second every time. I never give zofran over 30 seconds or the preferred 2-5 min either. Does anybody do that?