Questions · Myocardial Injury After Noncardiac Surgery
9 questions, 0 approved. Approve them one at a time — a quiz shows nothing you have not.
Recall — derived from a kept point
In the large cohort study of postoperative high-sensitivity troponin T after noncardiac surgery, state the peak troponin patterns that predicted 30-day mortality, and state what proportion of these patients had any symptom.
Answer: A peak postoperative high-sensitivity troponin T of 20 to under 65 ng/L accompanied by a rise of at least 5 ng/L, or a peak of 65 ng/L and above, predicted 30-day mortality — and it did so even when there was no ischaemic symptom and no ECG change. 93% of these patients had no symptom at all.
Ninety-three percent of these patients had no symptom at all, which is why the troponin has to be measured rather than waited for.
Source claim: A peak postoperative high-sensitivity troponin T of 20 to under 65 ng/L with a rise of at least 5 ng/L, or 65 ng/L and above, predicts 30-day mortality even with no ischaemic symptom or ECG change — and 93% of these patients had no symptom at all.
Association of Postoperative High-Sensitivity Troponin Levels With Myocardial Injury and 30-Day Mortality Among Patients Undergoing Noncardiac Surgery, JAMA 2017
recall · CA-1 · phrased by llm
In the prospective international multicentre VISION cohort of intraoperative haemodynamics, what maximum intraoperative heart rate threshold was linked to myocardial injury, myocardial infarction and mortality after noncardiac surgery? State how strong that link can be claimed to be.
Answer: A maximum intraoperative heart rate above 100 bpm was associated with increased risk of myocardial injury, myocardial infarction, and mortality after noncardiac surgery. Because this is a prospective cohort study, the finding is an association only — it does not establish that the tachycardia caused the injury, nor that treating heart rate down below 100 prevents it.
A maximum intraoperative heart rate over 100 is associated with myocardial injury, infarction and death — an observed association in a cohort, not proof that treating the number changes the outcome.
Source claim: Maximum intraoperative heart rate >100 bpm is associated with increased risk of myocardial injury, myocardial infarction, and mortality after noncardiac surgery.
A Prospective International Multicentre Cohort Study of Intraoperative Heart Rate and Systolic Blood Pressure and Myocardial Injury After Noncardiac Surgery: Results of the VISION Study, Anesthesia and analgesia 2018
recall · CA-2 · phrased by llm
A resident asks for the single troponin number that defines myocardial injury after noncardiac surgery. Explain why one number cannot be given, and state what the cohort study using the Abbott high-sensitivity troponin I assay found at its threshold.
Answer: Diagnostic thresholds are assay-specific, so no single number transfers between laboratories. With the Abbott high-sensitivity troponin I assay specifically, a peak of 60 ng/L or above carried more than a seven-fold increase in major cardiac events and death at 30 days. That figure is a cohort association tied to that one assay and that 30-day endpoint, not a universal cut-off.
Sixty ng/L means something on the Abbott high-sensitivity troponin I assay and nothing on anyone else's — the threshold belongs to the assay, not to the diagnosis.
Source claim: Diagnostic thresholds are assay-specific: with the Abbott high-sensitivity troponin I assay, a peak of 60 ng/L or above carried more than a seven-fold increase in major cardiac events and death at 30 days.
High-Sensitivity Cardiac Troponin I Thresholds to Identify Myocardial Injury After Noncardiac Surgery: A Cohort Study, The Canadian journal of cardiology 2023
recall · CA-2 · phrased by llm
The MANAGE trial studied dabigatran in patients with myocardial injury after noncardiac surgery. State the dose, the effect on major vascular complications with the actual event rates, and what happened to major bleeding. Then state what this evidence does and does not establish.
Answer: Dabigatran 110 mg twice daily reduced major vascular complications from 15% to 11% with no significant increase in major bleeding. This is a single international randomised placebo-controlled trial: it demonstrates that effect within that trial, but on its own a four-percentage-point reduction in one trial is a trial result, not a recommendation to anticoagulate these patients as a matter of course.
One randomised trial moved major vascular complications from 15% to 11% without significantly more major bleeding — that is a trial result, not yet a standing instruction.
Source claim: In patients with myocardial injury after noncardiac surgery, dabigatran 110 mg twice daily reduced major vascular complications from 15% to 11% with no significant increase in major bleeding.
Dabigatran in Patients With Myocardial Injury After Non-Cardiac Surgery (MANAGE): An International, Randomised, Placebo-Controlled Trial, Lancet (London, England) 2018
recall · CA-3 · phrased by llm
With the ADVIA Centaur high-sensitivity troponin I assay a peak of ___ ng/L or above carried a more than five-fold increase in 30-day major cardiovascular events, and predicted them whether or not ischaemic features were present.
Answer: 75
With the ADVIA Centaur high-sensitivity troponin I assay a peak of 75 ng/L or above carried a more than five-fold increase in 30-day major cardiovascular events, and predicted them whether or not ischaemic features were present.
High-Sensitivity Troponin I Predicts Major Cardiovascular Events After Non-Cardiac Surgery: A Vascular Events in Non-Cardiac Surgery Patients Cohort Evaluation (VISION) Substudy · PMID 36762424
recall · CA-3 · phrased by derived
The point with one number taken out. No model wrote any of this: the stem is the sentence you reviewed, minus a digit, and the paper it came from is named beneath it.
Open prompts
How would you teach this to a CA-1 in two minutes?
open · CA-3 · phrased by derived
Where does the evidence for this actually stop?
open · CA-3 · phrased by derived
What would you do differently in a resource-limited setting?
open · CA-3 · phrased by derived
Defend the alternative you decided against.
open · CA-3 · phrased by derived
Questions only — nothing here asserts anything, which is why a model is allowed to phrase them. Where no model was reachable these are the level defaults.