Thread by @LazarusLong13

A thread on ambulance ventilation.

And why you are going to see more staffing EMS staffing shortages - resulting in you laying forever next to your wrecked car.

Waiting to be picked up by CoVid+ EMT's in surgical masks.

https://twitter.com/docjon55/status/1458870322199998480

Study is here - click the PDF button....or just ride along in this clown car.
researchgate.net/publication/33…

Looks like in the USA, there are no standards for ventilation in ambulances.

Used to be 30 ACH..which would be amazing.

In the UK, they recommend not using the recirculating air during AGP's, during pandemics.

assets.publishing.service.gov.uk/government/upl…

Currently, surgical masks as long as within 6 feet of the CoVid+. No recirculating.
gov.uk/government/pub…

All based on WHO guidance. (Foreshadow.)

The default ventilation of the ambulance is 5 ACH, IF the exhaust blower was on.

They replaced the default ventilation tho with the below HEPA filter, so they could get accurate measurements, avoiding external aerosols, and reset quickly.

Quite clever.
americanlaboratorytrading.com/lab-equipment-…

Here's the rest:

"For each test, four optical particle counters
(OPCs) were placed in locations representing possible positions for a seated EMS worker treating the
patient. OPCs were placed in the positions labeled OPC 1-4 when the cot was at 0° or 30°, and positions ..."

Before going on, let's touch on the 5 ACH that all of you will be hit with in surgical masks.

Even with surgical masks on, we have certainly seen a huge number of outbreaks in hospitals with 6 ACH (better) ventilation

and continuous surgical masking.

For example, Alberta Health Services, @AHS_media, which is the embodiment of the @WHO's IPC guidance.

Stands to reason as Dr. Conly rules over AHS AND the WHO with a very clean fist.

https://twitter.com/CPita3/status/1441928719266992129?t=h9APMBqKa7kJFB5u9bGcRA&s=19

Back to our clown car, Lindsley (yep, the famous one) found that a single cough resulted at least some worker exposure.

Given that Delta is everywhere, and we now know it takes under 3 virii to successfully infect?

Not good.

Might not be a bad idea to buy a @FixTheMask brace

in case you have to go to the hospital or even ride in an ambulance.

Or make the 3 rubber band version and keep it in your wallet or purse:


Why would there still be exposure?

"Air circulation pattern in the ambulance patient compartment generated by...

the ventilation
system. The jet of air created by the air inlet causes a clockwise recirculation pattern to form which
circulates aerosol particles throughout the compartment. Even if the cough is directed toward the rear
of the ambulance, aerosol particles are carried

toward the front by the recirculation. Thus, a worker
anywhere in the ambulance is exposed to the cough aerosol particles."

Thus, you will be exposed to the same.

But does it have to be this way?

No. Or I should say, N100.

The same solution as in this thread that was

slightly viral about 25 years of no infection in the Texas TB hospital:

https://twitter.com/LazarusLong13/status/1439816663721938949

And the same solution being used today by NYC's EMS:
nydailynews.com/new-york/ny-fd…

But the story does not end there.

Did you know that someone tried putting a HEPA filter into an ambulance?

cdc.gov/niosh/hhe/repo…

"The effective
air change rates ranged from about 43 to 46 ACH in
the HEPA ambulance, and from 26 to 32 ACH in the
non–HEPA ambulance."

This provides further proof that

portable air cleaners such as the Corsi/Rosenthal Box are additive to any current air cleaning infrastructure.

And...they help remove aerosols much faster.

The message is the same because this is NOT rocket science.

Vax.
N100.
HEPA if you can afford it.
CR Box if you can't

A very cool simulation model study confirming what Dr. Noakes shared below. Thank you!

1 - An ambulance transport with a patient actively emitting a virus.
2 - A subsequent transport with an uninfected patient <- very interesting setup here.

https://twitter.com/CathNoakes/status/1459246131419004934?s=20