Dr. Alexander Wong Profile picture
Oct 24, 2021 19 tweets 9 min read Read on X
A LONG explanatory 🧵 on ICU 'capacity' & 'flow' in Saskatchewan & why we need MULTIPLE interventions to avoid compromised care for ALL #SK citizens & triage.

I'm going to use an analogy of ICU capacity = bathtub. Patients = water. Health care system = house.

1/ #COVID19SK
Water is running into the bathtub. That's all the patients who need ICU care in Saskatchewan. Some have COVID, some don't. The patients have now overflowed our ICUs.

To cope, we've built walls up on our bathtub to hold more water. That's our 'surge' capacity.

2/ #COVID19SK
We can only build walls up on the tub so much, because there's limits on what can be done safely w/ availability of specialized staff, especially nursing & respiratory therapists (who support ventilated persons).

We've reached that limit w/ ~120 pts in #SK ICUs.

3/ #COVID19SK
Every bathtub has a drain. In normal times, there's a predictable flow of patients in (the water tap) and out (the drain), so that the water level doesn't get too high.

The problem with COVID+ persons, is that they take a LONG time to get out of ICU.

4/ #COVID19SK
When we have this huge surge of COVID+ persons, that means the water is running twice as fast as normal, filling the bathtub too fast.

At the same time, the drain is gummed up with debris, so the water is draining out far slower than in normal times.

5/ #COVID19SK
Remember, we're still dealing with normal flow of non-COVID patients needing ICU care.

The drain is 'plugged' because COVID+ persons take so long to get out of ICU, unless they die.

Our ICU capacity has overflowed. Water's over the edge. The house is flooding.

6/ #COVID19SK
Let's look at our interventions.

We're transferring COVID+ patients out of our ICUs, thousands of kilometers away to Ontario. That's like taking a bucket and pulling water out of the tub.

It provides TEMPORARY relief so we can manage more patients.

7/ #COVID19SK
Thankfully, we're getting @CanadianForces personnel likely next week.

Those additional specialized staff will allow us to build our walls on the tub a bit higher, or reinforce the walls that exist as so many of our frontline HCWs are struggling & burning out.

8/ #COVID19SK
Let's look at our tub. We can't 'unplug' the drain because we have so many COVID+ persons taking up beds, and they keep coming.

We can keep flying #SK citizens out of province to provide temporary relief, of course. Bucketing that water out of the tub helps.

9/ #COVID19SK
So that leaves the water taps. Throughout the majority of this 4th wave in Saskatchewan, we've left the taps running on full blast.

No public health measures till indoor masking mid-September. No private gathering restrictions. Vaccine mandates very late, etc.

10/ #COVID19SK
So the tub is overflowing, the house is flooding, and it's a complete crisis. Meanwhile, somehow, the water's still running full blast.

What our public health leaders have been calling for for weeks now, have been measures to slow the taps.

11/ #COVID19SK
Private indoor gathering restrictions, capacity limits in public venues, distancing measures, work from home mandates, vaccine mandates... ALL of those measures help to prevent more COVID cases, and slow the water tap running into our tub.

12/ #COVID19SK
We've watched as the tub has overflowed, the house
(our healthcare system) is flooding fast, and ONLY THEN called for staffing help & ICU transfers to Ontario.

But all of those measures are temporary. We can't keep flying everyone out of province forever.

13/ #COVID19SK
Meanwhile, the rest of Canada are watching us from their dry houses, except Alberta, who flooded a few weeks ago along with us and are picking up the pieces.

Ontario has kept tight control on their taps. They're helping us in our time of need - thank you, #ON.

14/ #COVID19SK
So the question that our public health & medical leaders can't answer is simple. Why, when the house is flooding, do we not turn off (or at least slow down) the taps?

The longer we wait, the more significant the damage both short- and long-term.

15/ #COVID19SK
FYI, monoclonal antibody therapy has no real place in this analogy. Given broken testing dynamics & the logistics required, 'early treatment' will do very little to help us in short-term.

I'd liken monoclonal therapy to a sponge, basically. A very small one.

16/ #COVID19SK
Vaccinations & boosters WILL help slow the water, but only in longer-term, not RIGHT NOW.

What WILL help RIGHT NOW is private indoor gathering restrictions, capacity limits on venues, and other approaches to limit human contact, especially for those unvaccinated.

17/ #COVID19SK
In summary: the tub's overflowing and our house is flooding.

We're building higher walls & bucketing water out, but somehow we're NOT turning off the taps.

Put plainly, this is NON-SENSICAL. This is why the rest of Canada is looking at us and going, "For real?"

18/ #COVID19SK
To finish this (lame) analogy, it's NOT too late to turn off the taps @SKGov. The house is still salvageable, barely.

The price of inaction is our flooded house. Wait longer, and what will be left is the flooded & unsalvageable remains of our health care system.

19/ #COVID19SK

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More from @awong37

Apr 18, 2022
Latest wastewater data for #SK communities was released earlier today. It's NOT good.

Let's work through what has been going on over the last couple of weeks as BA.2 has taken complete hold across Saskatchewan.

Short 🧵 - here we go. (1/7)
Regina & Saskatoon have seen HUGE increases in wastewater viral burden since early April. It's all driven by the more contagious BA.2 Omicron variant.

@LaurenPelley tweeted last week as Saskatoon's viral burden increased an astonishing *742%*. (2/7)

As of Apr 13, Saskatoon's viral burden has increased by yet another 25%, setting a new historic record once again. Nuts.

Viral burdens are TRIPLE that of the worse levels seen with Delta last Fall. It's all BA.2 - 99.3% now. The tiny 0.7% remaining is BA.1. (3/7)
Read 7 tweets
Mar 3, 2022
Between February 1-26, 143 Saskatchewan citizens have died from #COVID19, despite Omicron being "less severe".

That's an INSANELY high number.

Saskatchewan's most deadly month thus far was October 2021, when 156 people died during our horrific Delta wave. /1
As highlighted by @DrKyle, Saskatchewan's death rate from #COVID19 is more than DOUBLE that of the 2nd highest province, Manitoba.

No province is even remotely close in terms of deaths per capita at this point with Omicron. So embarrassingly bad. /2

With 2 days left, February 2022 might not technically be Saskatchewan's deadliest month during this pandemic, but remember... there's only 28 days in February vs 31 days in October.

If you pro-rate 5.5 deaths per day (February 2022's deaths per day) x 31 days? *170* deaths. /3
Read 5 tweets
Feb 28, 2022
Hi, Saskatchewan.

Though @SKGov has now dropped all #COVID19 protections & mandates, sadly, COVID is NOT over.

#SK hospitals & ICUs remain packed.

Patients are being admitted, and dying, tragocally, eacn and every day.

A short 🧵 below for my fellow Saskatchewanians. /1
Please, be mindful of our medically vulnerable, kids under 5 who can't be vaccinated, the elderly & frail. Those who will and already face long COVID.

Respect their health and their right to live their lives as fully as possible in a manner that is safe & low-risk. /2
If your immediate response for those who are vulnerable to or anxious of COVID is, "well, just stay home"?

Remember how you felt when "others" said the same to you about mask mandates or proof-of-vaccine programs.

Let's end the divisiveness. Let's do things TOGETHER, safely. /3
Read 11 tweets
Feb 24, 2022
Weekly Saskatchewan COVID-19 data for Feb 13-19.

KEY POINTS:
- 37 deaths over 7 days. 1 b/w 20-39, all others >= 40
- Hospitalizations & ICU admissions decreasing (phew)
- Weekly test positivity 14.4% (last wk ~20%)
- ALL Omicron (no breakdown of BA.1 vs BA.2)

Brief 🧵 /1
Let's start with key data around hospitalizations & ICU admissions.

Week-by-week hospitalizations down 9% to 372, ICU down 18% to 27. Slowly coming down, thankfully.

Of those with known COVID status, 42% in hospital/ICU "due to COVID", 58% "incidental". /2
We can see that overall hospital admissions per day definitely decreasing now across all regions of Saskatchewan, but it's a relatively slow decrease, likely driven by limited protections we have in place provincially.

Still, this is reassuring and encouraging. /3
Read 15 tweets
Feb 22, 2022
Saskatchewan #COVID19 wastewater data released today for 4 #SK communities.

Both Saskatoon & Regina showing significant INCREASES in viral load week over week. Discouraging.

Reasons for increase unclear at this time. BA.2 driven?

Brief 🧵 to review #SK wastewater data. /1
Let's start with Regina.

@UofRegina wastewater analysis shows rebounding viral load levels week-over-week, suggestive of ongoing high rates of viral transmission in community.

BA.1 remains dominant but 18% BA.2 reported too. We expect BA.2 to dominate in coming days. /2 Image
Also, note that @UofRegina plot is time-lagged by 13 days, as the most recent analysis comes from the time period b/w Feb 6-12 inclusive.

So presumably proportion of BA.2 in Regina is higher now, just don't know how much higher. /3
Read 11 tweets
Feb 20, 2022
"Hi Alex, what's BA.2? Is it a little bad or is it REALLY bad?"

BA.2 is a sub-lineage of Omicron. The 'original' lineage of Omicron is designated as BA.1 & remains the dominant strain circulating in most parts of Canada currently.

A brief 🧵 of what we know thus far. /1
BA.1 & BA.2 are both classified by @WHO as Omicron, but are distinct viruses. See the phylogenetic diagram below (thx @kallmemeg).

BA.2 has over 25 mutations that differentiate it vs BA.1.

Many questions still exist around how similar BA.1 & BA.2 are clinically. /2
Danish pre-print data comparing transmission of BA.1 vs BA.2 in household settings suggests BA.2 IS more transmissible than BA.1.

BA.2 also LIKELY possess more immune-evasive properties vs BA.1 that could reduce vaccine efficacy. /3

medrxiv.org/content/10.110…
Read 20 tweets

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