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@gmail.com or pharber@email.arizona.edu 

Office Phone: 520-626-1263

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Coming soon from OEM Press!


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On Fri, Oct 8, 2021 at 9:28 AM Wendland, Douglas <Douglas.Wendland@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@mylist.net> On Behalf Of Davidson Sherri lynn
Sent: Wednesday, October 6, 2021 1:36 PM
To: MCOH-EH <mcoh-eh@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@mylist.net> On Behalf Of Higazi, Patricia via MCOH-EH
Sent: Wednesday, October 6, 2021 1:01 PM
To: MCOH-EH <mcoh-eh@mylist.net>
Cc: Higazi, Patricia <Patricia.Higazi@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@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@mylist.net> On Behalf Of Higazi, Patricia via MCOH-EH
Sent: Friday, October 1, 2021 4:16 PM
To: MCOH-EH <mcoh-eh@mylist.net>
Cc: Higazi, Patricia <Patricia.Higazi@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