[MCOH-EH] CAPR MAxair

[Philip Harber]

Very good thoughts.



But, I wonder if the FFR (N95) data are relevant to PAPR/CAPR which has
ongoing fan driven flow from the wearer’s face. The CAPR may have a benefit
of blocking block direct movement of large aerosol particles (aka droplets).



Also some NPPTL results show that the exhalation valve may not even open at
low exertion levels. See:

http://rc.rcjournal.com/content/55/5/569.short

Roberge RJ, Coca A, Williams WJ, Powell JB, Palmiero AJ. Physiological
impact of the N95 filtering facepiece respirator on healthcare workers.
Respir Care. 2010 May;55(5):569-77. PMID: 20420727.  “…the exhalation valve
is activated only at a certain breathing-pressure threshold that may not
have been attained under our study conditions.”



 An underlying issue is how cautious to be when the data do not clearly say
either Yes or No. (ie, what is the right balance for the
'precautionary principle'?)


Phil

*Philip Harber MD MPH (Univ Arizona)*

email:  philharber at gmail.com or pharber at email.arizona.edu

Office Phone: 520-626-1263

[image: image.png]

Coming soon from OEM Press!


----------------------------------



On Fri, Oct 8, 2021 at 9:28 AM Wendland, Douglas <
Douglas.Wendland at slhduluth.com> wrote:

> What still is unknown is whether the unfiltered exhaust air from the CAPR
> is potentially more hazardous than the exhaled air from the wearer of a
> surgical mask.  I believe that study of N95s with exhaust valves showed
> that they offer much better source control than surgical masks, but far
> inferior than N95s without valves.  The missing variables includes the
> probability of the HCW using respiratory protection having an unrecognized
> COVID-19 infection.  I’m not sure that that risk supports not using any
> particular type of respirator.
>
>
>
> Douglas M Wendland, MD, MPH
>
> St. Luke's Occupational Medicine
>
>
>
> *From:* MCOH-EH <mcoh-eh-bounces at mylist.net> *On Behalf Of *Davidson
> Sherri lynn
> *Sent:* Wednesday, October 6, 2021 1:36 PM
> *To:* MCOH-EH <mcoh-eh at mylist.net>
> *Subject:* Re: [MCOH-EH] CAPR MAxair
>
>
>
> *CAUTION: External Sender - *This email originated from outside of *St.
> Luke's*.
> Please do not click links or open attachments unless you recognize the
> sender and know the content is safe.
>
> Good point
>
>
>
> *From:* MCOH-EH <mcoh-eh-bounces at mylist.net> *On Behalf Of *Higazi,
> Patricia via MCOH-EH
> *Sent:* Wednesday, October 6, 2021 1:01 PM
> *To:* MCOH-EH <mcoh-eh at mylist.net>
> *Cc:* Higazi, Patricia <Patricia.Higazi at chkd.org>
> *Subject:* {EXTERNAL} Re: [MCOH-EH] CAPR MAxair
>
>
>
> *CAUTION! *This email originated from outside of our organization. *DO
> NOT CLICK* links or open attachments unless you recognize the sender and
> know the content is safe.
>
> Maxair CAPR – incoming air is filtered – exhaust air out (by worker) is
> not filtered
>
>
>
> Patricia Higazi  MSN RN COHN
>
> Occupational Health Director
>
> Children’s Hospital of The King’s Daughters
>
> Norfolk, Virginia 23507
>
> Tel: 757 668 7852
>
> Fax: 757 668 8775
>
>
> *From:* MCOH-EH [mailto:mcoh-eh-bounces at mylist.net
> <mcoh-eh-bounces at mylist.net>] *On Behalf Of *Davidson Sherri lynn
> *Sent:* Monday, October 04, 2021 12:58 PM
> *To:* MCOH-EH
> *Subject:* Re: [MCOH-EH] CAPR MAxair
>
>
>
> *External*:
>
>
>
> Most CAPR’s are filtered.  What brand are you using?
>
>
>
>
>
> Sherri Davidson, MSN, APRN-BC, COHN-S
>
> Company Care at
>
> Palms of Pasadena Hospital
>
> 1609 Pasadena Avenue South
>
> Suite 4J
>
> St. Petersburg, FL 33707
>
> Phone: (727) 341-7514
>
> Fax: (727) 341-7583
>
>
>
>
>
>
>
> *From:* MCOH-EH <mcoh-eh-bounces at mylist.net> *On Behalf Of *Higazi,
> Patricia via MCOH-EH
> *Sent:* Friday, October 1, 2021 4:16 PM
> *To:* MCOH-EH <mcoh-eh at mylist.net>
> *Cc:* Higazi, Patricia <Patricia.Higazi at chkd.org>
> *Subject:* {EXTERNAL} [MCOH-EH] CAPR MAxair
>
>
>
> *CAUTION! *This email originated from outside of our organization. *DO
> NOT CLICK* links or open attachments unless you recognize the sender and
> know the content is safe.
>
> Is anyone having staff wear a face mask under a CAPR?  The issue is air
> blown out is not filtered so the patient may not be protected?
>
>
>
> Patricia Higazi  MSN RN COHN
>
> Occupational Health Director
>
> Children’s Hospital of The King’s Daughters
>
> Norfolk, Virginia 23507
>
> Tel: 757 668 7852
>
> Fax: 757 668 8775
>
>
>
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