Winters Formula

[chromuffin]

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Which formula do you use for determining predicted respiratory compensation for metabolic acidosis?

2016 FA has P_CO2 = 1.5[HCO3-]+8 +/-2

My lecturer and every resource I've found has
0.7[HCO3-]+20 +/- 5

Slight difference so I'm not sure if either would work.

Bicarb of 10 would give..
23 +/- 2 for FA
27 +/- 5 for everything else I've seen

Thoughts?

 

[Beezlebub]

Which formula do you use for determining predicted respiratory compensation for metabolic acidosis?

2016 FA has P_CO2 = 1.5[HCO3-]+8 +/-2

My lecturer and every resource I've found has
0.7[HCO3-]+20 +/- 5

Slight difference so I'm not sure if either would work.

Bicarb of 10 would give..
23 +/- 2 for FA
27 +/- 5 for everything else I've seen

Thoughts?

"0.7[HCO3-]+20 +/- 5" isn't winter's formula; it is used to calculate pco2 during metabolic alkalosis

Winter's is "1.5[HCO3-]+8 +/-2" during metabolic acidosis, so use the FA's equation

 

[chromuffin]

"0.7[HCO3-]+20 +/- 5" isn't winter's formula; it is used to calculate pco2 during metabolic alkalosis

Winter's is "1.5[HCO3-]+8 +/-2" during metabolic acidosis, so use the FA's equation

Clearly I'm an idiot haha. Thanks. Should've read my notes better

 

[Beezlebub]

Clearly I'm an idiot haha. Thanks. Should've read my notes better

Give my regard to your lecturer.

 

[Indirect&Passive]

I would just use 1.5*HCO3+10 and then subtract 4 for the lower end of the range, in my head that was much easier, and came in handy on exam day


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[Anti-PD1]

This might be overkill, but it's important to understand these trends.