The Berggren Equation, also known as the shunt equation. Berggren Equation Shunt Fraction Qs/Qt = (CcO₂ − CaO₂) / (CcO₂ − CvO₂) Inputs Units mmHg kPa CcO₂ [PAO₂] Calculate mmHg CaO₂ [PaO₂] mmHg CvO₂ [ScvO₂ surrogate] mmHg Alveolar Gas Calculation (PAO₂) Assume sea-level: PB=760 mmHg (101.3 kPa), PH₂O=47 mmHg (6.3 kPa), RQ=0.8 FiO₂ (%) % PaCO₂ (mmHg) Equation PAO₂ […]
Read More »A-a Gradient Calculator | criticalcare.info A-a Gradient Calculator PAO2 = (713 × FiO2) − (1.25 × PaCO2) A-a Gradient = PAO2 − PaO2 FiO2: 0.21 (fraction) PaCO2: 40 mm Hg PaO2: 90 mm Hg
Read More »What a stupid name. Nonetheless it’s what we’re stuck with. It is the ratio of LVOT VTI to AV VTI. Given that ALL ratios are dimensionless, you can see my chagrin. VTI LVOT / VTI AV LVOT is measured with pulse wave, to localise it to the LVOT AV VTI is measured with continuous wave, […]
Read More »What follows is a curated distillation of the ANZICS Statement on Death and Organ Donation. Donation after Circulatory Determination of Death (DCDD) Maastricht classification – only 3 & 4 used in Aus/NZ Category Context Warm ischaemic time Degree of control Category 1 Dead on arrival Unknown Uncontrolled Category 2 Failed resuscitation (ED or ICU) Known […]
Read More »Death is defined variably (or not defined at all) in jurisdictions around the world, but are mostly similar. What follows below are the two types of determination of death, as recommended in the ANZICS Statement on Death and Organ Donation Neurological Determination of Death Preconditions Clinical testing Cranial Nerves Tested (II – X) Reflex Afferent […]
Read More »Ok, so classically we talk about transudates vs exudates by pleural fluid analysis. I’ll reframe this (I’m sure it’s already obvious to you, but hey) as ‘how can we diagnose an exudate, and the cause’ Protein & LDH Differential Glucose pH Amylase Cholesterol
Read More »Goldmine Ranganath Muniyappa, Monica Montagnani, Kwang Kon Koh, Michael J. Quon, Cardiovascular Actions of Insulin, Endocrine Reviews, Volume 28, Issue 5, 1 August 2007, Pages 463–491
Read More »Locations of major topic guidelines, in alphabetical order by subject Death & Organ Donation: ANZICS Statement DKA (adult): JBDSIC (3ed) 2022 ECMO Guidance: ELSO Guidelines Extracorporeal treatments in toxicology: EXTRIP Recommendations Resuscitation: ARC Guidelines TBI: BTF Guidelines (4ed) 2016 Patient Transport: ACEM/ANZCA/CICM Guidance British Thoracic Society: BTS Guidelines
Read More »There are really 3 types of thing to image when we are talking about C-spine injury The modality of choice depends on the structure of interest: Various features favour one over the other: Feature CT MRI Availability Widely available Limited availability Gold standard for: Bony injury Soft tissue & neural injury Radiation Some (potentially vulnerable […]
Read More »Great little article on a DDx flowchart for the Reverse Halo Sign on CT. Godoy MC, Viswanathan C, Marchiori E, Truong MT, Benveniste MF, Rossi S, Marom EM. The reversed halo sign: update and differential diagnosis. Br J Radiol. 2012 Sep;85(1017):1226-35. doi: 10.1259/bjr/54532316. Epub 2012 May 2. PMID: 22553298; PMCID: PMC3487053.
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