D. Blair Macdonald MD

Section Head ER and Trauma Radiology.
Associate Professor of Radiology @uOttawaRad
GI, GU, and ER Radiologist, CT Lead Radiologist @OttawaHospital

[Vineet Chopra @vineet_chopra]

As an editor, I often read discussions that are long winded, meandering and fail to make an impact.

They feel like an after-thought rather than a key part of the paper.

Here are some tips to make your discussion better. Full credit to @sanjaysaint who taught me this years ago!

[Doug Lake @douglakemd]

Want to get better at diagnosing acute cholecystitis with ultrasound?

Learn about cystic artery velocity (CAv)

[D. Blair Macdonald MD @bmactweet]

The private-public debate is a distraction from health care’s real problems. Yep. [Canadians] care about timely access, affordability and quality. https://t.co/cCBLPHrSCY

[Baris Turkbey MD @radiolobt]

Diagnostic value of combining PI-RADS v2.1 with PSAD in clinically significant prostate cancer https://t.co/LCGJFxzGOL #prostatecancer #prostateMRI #CancerResearch #MedTwitter

[D. Blair Macdonald MD @bmactweet]

We must be determined to achieve positive change, but also to take a long view of what needs to be done.

[Dalai Lama @DalaiLama]

We have to remember that each and every one of us is part of humanity. We must be determined to achieve positive change, but also to take a long view of what needs to be done. What is important is not to become demoralized. Optimism leads to success; pessimism leads to defeat.

[Dalai Lama @DalaiLama]

Satisfaction is characterized by inner peace. It arises from generosity, honesty and what I call ethical conduct, a way of behaving that respects others’ right to be happy.

[D. Blair Macdonald MD @bmactweet]

-Staff sick or off due to COVID-19 exposure.
-Patient illness more severe, due to treatment delays in pandemic waves.
-Hospital wards overfilled due to surgery catch-up, limits ER patient admission. https://t.co/UI9gjBq6pb

[Avraham Z. Cooper, MD 🩺 @AvrahamCooperMD]

How to recognize lung segments on CT 🫁

#MedTwitter

[D. Blair Macdonald MD @bmactweet]

https://t.co/PGGaWjSHWr

[uOttawa Dept. Radiology, Rad Onc & Medical Physics @uOttawaRad]

An excellent publication that will be cited for years to come coauthored by @epi_rad, @bmactweet, @brownpa79 & more! Canadian Association of Radiologists Guidance on Contrast Associated Acute Kidney Injury➡️ https://t.co/FE9EjOFlrI

[Swapnil Hiremath @hswapnil.medsky.social @hswapnil]

Yet another contrast AKI guideline

https://t.co/8dPSgnAkmj

jointly published in @CARadiologists and @CanJKHD

thread to come later - it is #OpenAccess - feel free to read and send bouquets (or brickbats) our way

[D. Blair Macdonald MD @bmactweet]

Tim Urban essay @NYTOpinion. We think a lot about those black lines: the roads not taken, the opportunities missed, the ones that got away. But most of us greatly underestimate the size of the lush green tree of possibilities that lie ahead of us https://t.co/mLJ0m3b9GY

[D. Blair Macdonald MD @bmactweet]

@CBarreraMD @CBarreraMD great resource diagram. what’s your approach to hypervascular liver lesions? FNH vs HCA. And HCA sub-typing for management. ( aware of pitfalls/overlap but is there still potential for value?) Gadoxetic acid for HCA v FNH in your practice?

[D. Blair Macdonald MD @bmactweet]

Thanks for the helpful education on this strategy @imgrund .

[Tristan Imgrund @tristan_sudbury]

Symptom screening can stop up to 10% of transmissions from occurring.

Rapid antigen tests? Up to 80%.

FREE THE RAPID ANTIGEN TESTS!

[Isaac Bogoch @BogochIsaac]

Significant immune response (antibody & T cell) in those who received a 1st dose of AstraZenca's #COVID19 vaccine followed by an mRNA vaccine for dose 2.

Data from Germany, recently published in @NatureMedicine 👇

(Many Canadian's took this approach. Solid plan...thanks, NACI.)

[University Health Network @UHN]

Safety & wellbeing of patients, staff & community is our main priority. Starting Aug 9, all UHN employees will be required to report they have either been vaccinated against COVID19, or have tested negative with a rapid test at home & reported within 48h of their scheduled shift.

[D. Blair Macdonald MD @bmactweet]

@NickSchiedaMD Several factors could give error results: slice thickness, different kvp and mA, vender specific calibration, different QA team and phantoms. Enough unknowns that I would like to see a well designed trial on representative scanners and lesion types to prove this in practice.

[theRadiologist @radiologistpage]

A system to assess Chest X-Ray review areas (in one minute)

[David Fisman @DFisman]

Here it is graphically with a couple of different ways of estimating R. Could there be other explanations? Sure. But this is exactly what you'd expect to see if the red zone strategy were impactful, on exactly the right timeline (10-14 day lag).

[David Fisman @DFisman]

The biggest covid-19 success story you aren't hearing right now is in Quebec. The "red zone" limited closure strategy (close bars, restos, gyms, restrict private gatherings, masks indoors in high schools) has knocked R down from 1.4 two weeks ago to 0.9 today.