Estimating VO2 - Revision history

Aesetholephews at 17:55, 11 December 2024

2024-12-11T17:55:51Z

Aesetholephews at 05:52, 17 August 2024

2024-08-17T05:52:38Z

Aesetholephews at 05:42, 17 August 2024

2024-08-17T05:42:04Z

Aesetholephews at 05:40, 17 August 2024

2024-08-17T05:40:28Z

Aesetholephews at 04:08, 17 August 2024

2024-08-17T04:08:18Z

Aesetholephews at 03:48, 17 August 2024

2024-08-17T03:48:20Z

Aesetholephews at 00:06, 10 August 2024

2024-08-10T00:06:25Z

Aesetholephews at 23:38, 9 August 2024

2024-08-09T23:38:09Z

Aesetholephews at 23:36, 9 August 2024

2024-08-09T23:36:13Z

Aesetholephews at 23:35, 9 August 2024

2024-08-09T23:35:45Z

← Older revision		Revision as of 17:55, 11 December 2024
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	* [https://www.clinicalkey.com/#!/content/playContent/1-s2.0-S0749070409001274?returnurl=https:%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0749070409001274%3Fshowall%3Dtrue&referrer=https:%2F%2Fpubmed.ncbi.nlm.nih.gov%2F A paper] from 2010 showing continuous CO monitor applied to both ICU and OR environments using a Fick rebreathing technique.		* [https://www.clinicalkey.com/#!/content/playContent/1-s2.0-S0749070409001274?returnurl=https:%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0749070409001274%3Fshowall%3Dtrue&referrer=https:%2F%2Fpubmed.ncbi.nlm.nih.gov%2F A paper] from 2010 showing continuous CO monitor applied to both ICU and OR environments using a Fick rebreathing technique.
	** CO2 production is calculated as the product of CO2 concentration and air flow during a breathing cycle and CaCO2 content is derived from EtCO2 and the CO2 dissociation curve.		** CO2 production is calculated as the product of CO2 concentration and air flow during a breathing cycle and CaCO2 content is derived from EtCO2 and the CO2 dissociation curve.
		+
		+	* [https://ovidsp-dc2-ovid-com.liboff.ohsu.edu/ovid-new-b/ovidweb.cgi?&S=GCKOFPCDEIEBGKEKJPIJJEIHPOGCAA00&Complete+Reference=S.projects.17%7c23%7c1 Older paper] stating that changes in O2 consumption trends can be useful in diagnosing MH.

← Older revision		Revision as of 05:52, 17 August 2024
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	** Calibrate the best guess of CvCO2 by using the EtCO2 and adding 4-6 mmHg		** Calibrate the best guess of CvCO2 by using the EtCO2 and adding 4-6 mmHg
	* [https://www.clinicalkey.com/#!/content/playContent/1-s2.0-S0749070409001274?returnurl=https:%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0749070409001274%3Fshowall%3Dtrue&referrer=https:%2F%2Fpubmed.ncbi.nlm.nih.gov%2F A paper] from 2010 showing continuous CO monitor applied to both ICU and OR environments using a Fick rebreathing technique.		* [https://www.clinicalkey.com/#!/content/playContent/1-s2.0-S0749070409001274?returnurl=https:%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0749070409001274%3Fshowall%3Dtrue&referrer=https:%2F%2Fpubmed.ncbi.nlm.nih.gov%2F A paper] from 2010 showing continuous CO monitor applied to both ICU and OR environments using a Fick rebreathing technique.
		+	** CO2 production is calculated as the product of CO2 concentration and air flow during a breathing cycle and CaCO2 content is derived from EtCO2 and the CO2 dissociation curve.

@@ Line 17: / Line 17: @@
 ** Rebreathing bag volume should be 1.5x the tidal volume.
 ** Calibrate the best guess of CvCO2 by using the EtCO2 and adding 4-6 mmHg
-* [https://www.clinicalkey.com/#!/content/playContent/1-s2.0-S0749070409001274?returnurl=https:%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0749070409001274%3Fshowall%3Dtrue&referrer=https:%2F%2Fpubmed.ncbi.nlm.nih.gov%2F A paper] from 2010 showing a Fick rebreathing technique continuous CO monitor applied to both ICU and OR environments.
+* [https://www.clinicalkey.com/#!/content/playContent/1-s2.0-S0749070409001274?returnurl=https:%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0749070409001274%3Fshowall%3Dtrue&referrer=https:%2F%2Fpubmed.ncbi.nlm.nih.gov%2F A paper] from 2010 showing continuous CO monitor applied to both ICU and OR environments using a Fick rebreathing technique.

@@ Line 9: / Line 9: @@
 * https://pubmed.ncbi.nlm.nih.gov/26976237/
 * From a [https://aeitechnologies.com/wp-content/uploads/2022/12/MOXUS-CARDIAC-OUTPUT-Option.pdf white paper] about the Moxus metabolic cart cardiac output estimation methods:
-** CO2 rebreathing Fick method. Q = VCO2 * (CaCO2 - CvCO2)
+** CO2 rebreathing Fick method. Q = VCO2 / (CaCO2 - CvCO2)
 ** VCO2 is "easily measured"... how?
 ** CaCO2 is estimated with EtCO2 if the subject has healthy lungs and the EtCO2 is peaking, otherwise PaCO2 from an ABG can be used

@@ Line 9: / Line 9: @@
 * https://pubmed.ncbi.nlm.nih.gov/26976237/
 * From a [https://aeitechnologies.com/wp-content/uploads/2022/12/MOXUS-CARDIAC-OUTPUT-Option.pdf white paper] about the Moxus metabolic cart cardiac output estimation methods:
-**
+** CO2 rebreathing Fick method. Q = VCO2 * (CaCO2 - CvCO2)

← Older revision		Revision as of 03:48, 17 August 2024
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	* https://pubmed.ncbi.nlm.nih.gov/8565545/		* https://pubmed.ncbi.nlm.nih.gov/8565545/
	* https://pubmed.ncbi.nlm.nih.gov/26976237/		* https://pubmed.ncbi.nlm.nih.gov/26976237/
		+	* From a [https://aeitechnologies.com/wp-content/uploads/2022/12/MOXUS-CARDIAC-OUTPUT-Option.pdf white paper] about the Moxus metabolic cart cardiac output estimation methods:
		+	**

← Older revision		Revision as of 00:06, 10 August 2024
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	* In 2016, the AHA published a scientific statement recommending that CRF – quantifiable as V̇O<sub>2</sub> max/peak – be regularly assessed and used as a clinical vital sign; ergometry (exercise wattage measurement) may be used if V̇O<sub>2</sub> is unavailable. [https://pubmed.ncbi.nlm.nih.gov/27881567/ source]		* In 2016, the AHA published a scientific statement recommending that CRF – quantifiable as V̇O<sub>2</sub> max/peak – be regularly assessed and used as a clinical vital sign; ergometry (exercise wattage measurement) may be used if V̇O<sub>2</sub> is unavailable. [https://pubmed.ncbi.nlm.nih.gov/27881567/ source]
	* V̇O<sub>2</sub> max is correlated with reduced all-cause mortality. [https://research-information.bris.ac.uk/ws/portalfiles/portal/314942003/CRF_Mortality_Final.pdf source]		* V̇O<sub>2</sub> max is correlated with reduced all-cause mortality. [https://research-information.bris.ac.uk/ws/portalfiles/portal/314942003/CRF_Mortality_Final.pdf source]
		+	* https://pubmed.ncbi.nlm.nih.gov/8565545/
		+	* https://pubmed.ncbi.nlm.nih.gov/26976237/

← Older revision		Revision as of 23:38, 9 August 2024
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	* [https://en.wikipedia.org/wiki/VO2_max#Reference_values Reference values] for V̇O2 max		* [https://en.wikipedia.org/wiki/VO2_max#Reference_values Reference values] for V̇O2 max
	* In 2016, the AHA published a scientific statement recommending that CRF – quantifiable as V̇O<sub>2</sub> max/peak – be regularly assessed and used as a clinical vital sign; ergometry (exercise wattage measurement) may be used if V̇O<sub>2</sub> is unavailable. [https://pubmed.ncbi.nlm.nih.gov/27881567/ source]		* In 2016, the AHA published a scientific statement recommending that CRF – quantifiable as V̇O<sub>2</sub> max/peak – be regularly assessed and used as a clinical vital sign; ergometry (exercise wattage measurement) may be used if V̇O<sub>2</sub> is unavailable. [https://pubmed.ncbi.nlm.nih.gov/27881567/ source]
		+	* V̇O<sub>2</sub> max is correlated with reduced all-cause mortality. [https://research-information.bris.ac.uk/ws/portalfiles/portal/314942003/CRF_Mortality_Final.pdf source]

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 * An automated machine check could calculate the amount of machine leak you have in the circuit, separate from any patient leak. Just occlude the Y-piece and run the vent while comparing your VTI - VTE. Average 20 breaths or so and likely there is a delta of a few ml with each breath accounting for air lost from circuit connections, internal machine leaks, tubing, etc. Variability may also be due to measurement error from the flow meters used.
 * Once connected to the patient, VTI - VTE gives the total volume lost per breath. Subtract the machine leak found above and this gives you the patient side leaks (air lost from around the ETT cuff, volume lost to chest tubes, etc)
-* FiO2 * FGF = V̇O2
+* FiO2 * FGF = V̇O<sub>2</sub>
-* You can calculate the V̇O2 using the Fick equation: <math chem>\ce{\dot VO2} = Q \times\ (C_a\ce{O2} - C_v\ce{O2})</math>, where Q is the cardiac output.
+* You can calculate the V̇O<sub>2</sub> using the Fick equation: <math chem>\ce{\dot VO2} = Q \times\ (C_a\ce{O2} - C_v\ce{O2})</math>, where Q is the cardiac output.
 * [https://en.wikipedia.org/wiki/VO2_max#Reference_values Reference values] for V̇O2 max
 * In 2016, the AHA published a scientific statement recommending that CRF – quantifiable as V̇O<sub>2</sub> max/peak – be regularly assessed and used as a clinical vital sign; ergometry (exercise wattage measurement) may be used if V̇O<sub>2</sub> is unavailable. [https://pubmed.ncbi.nlm.nih.gov/27881567/ source]