I walked up the very tall Metro escalator at Bethesda wearing my N95 mask and was slightly winded at the top, but not much more so than normally (sans mask). Maybe 5 percent?
On Thu, May 21, 2020 at 12:51 PM Karl Wittnebel via Mercedes < mercedes@okiebenz.com> wrote: > Surgical masks and cloth masks are far less restrictive than n95s. Here is > an article on n95s in healthcare workers. If a nurse can do this for 12h > walking all over the place without any issues, the rest of us can tolerate > cloth masks for a trip to the grocery store. > > > https://pubmed.ncbi.nlm.nih.gov/20420727/?fbclid=IwAR2i2WntsznayV4nJcAf0Nzi6kaHV5lLfdqhvQOKemqBCBN9bmBLpjoMaBk > > On Wed, May 20, 2020, 4:11 PM Curley McLain via Mercedes < > mercedes@okiebenz.com> wrote: > > > Very few people outside hospitals wear or have access to surgical > > masks. Most people are wearing home made is lam coverings. THe > > oxygen deprivation and/or CO2 accumulation is unknown for these, and is > > probably in line with the results of the study you want to trash > outright. > > > > > Karl Wittnebel via Mercedes <mailto:mercedes@okiebenz.com> > > > May 20, 2020 at 4:33 PM > > > Masks could be helpful. The evidence is not great as Max alludes, but > > they > > > definitely do not increase transmission and look increasingly like they > > > provide benefit in preventing transmission. There are no harmful > effects; > > > whoever wrote the O2 thing is full of BS. > > > > > > This was a recent summary, with refs: > > > > > > > > > https://m.facebook.com/story.php?story_fbid=137495654570048&id=100553591597588 > > > > > > Facemasks, facemasks, facemasks! The transmission control strategy so > > > effective, safe, and nice, we say it thrice! (Now, with numbers!) > > > > > > FACEMASKS: SAFE FOR DOCTORS AND THOSE WHO PLAY THEM ON TV > > > > > > Much of the worry about masks centers on misunderstandings about carbon > > > dioxide. > > > > > > Ever had surgery? Did you notice all the fully alert, bustling, masked > > > people- many of whom wear masks for 24+ hours in a row (đđźââď¸been > > there, > > > got the scrub top). Medical types prefer to keep their wits about them. > > > Operating, making snappy decisions, flirting with the scrub nurse > (thatâs > > > for the TV docs)- it requires those masked people to be firing on all > > > cylinders. If wearing a mask led to re-inhalation of oneâs own carbon > > > dioxide (called âhypercapniaâ) and the resultant sleepiness and trouble > > > thinking as mask detractors claim, weâd all be wandering around maimed > > > from > > > zombified surgeons. And there would be way fewer baby showers for the > > > TV OR > > > staff. > > > > > > More specifically, the porous nature of the material used for both > > > medical-grade masks and cloth masks fully permits normal respiration. > If > > > you can inhale through it, you can exhale through it. There is no > > trapping > > > and recirculating of air (otherwise it would blow up like a balloon > when > > > you breathe out). > > > > > > LYING ABOUT HAVING AN OBSTRUCTIVE AIRWAY DISEASE IS LIKE BUYING A > SERVICE > > > DOG VEST FOR YOUR IGUANA AND I DONâT WANT TO SIT NEXT TO YOUR IGUANA, > > > KAREN > > > > > > Also circulating around is a printable card citing the Americans with > > > Disabilities Act and stating the bearer does not need to comply with > > > masking, which anyone can print. > > > > > > Firstly, COPD patients are extremely vulnerable to viral infections and > > > could use the extra protection masking affords. Many people with mild, > > > well-controlled COPD can tolerate a mask just fine, since the added > > > resistance is minimal, but people with more severe disease cannot. > > > > > > Ever been on a flight with someoneâs pet in a fake service dog vest? > How > > > did lying work out? Donât be an emotional support peacock. > > > > > > FACEMASKS: THEYâRE ABOUT YOUR FACE, BUT NOT AN ABOUT-FACE > > > > > > There is confusion about why initially masks were NOT recommended, but > > now > > > they are. In early March the world experienced a catastrophic shortage > in > > > Personal Protective Equipment, most of which was made in China. > Frontline > > > health care workers were barebacking it, despite caring for patients > > > suffering from a lethal infectious disease. Many became infected, and > > some > > > died. Hospitals rationed equipment like it was the elixir of life. We > > came > > > up with clever ways to reuse and sterilize masks. We all remembered > > fondly > > > the days when we just *threw the extra gloves which come out of the > > > box all > > > glommed together away* like we were glove billionaires or something. > > > > > > Against that backdrop the public was advised not to wear masks. That > was > > > not because masks werenât safe, effective, or a great idea. It was > > because > > > masks were RATIONED where they were needed most. > > > > > > Now, things have opened up- medical masks are available again. Cloth > face > > > coverings, which are insufficient for frontline health care work around > > > massive doses of virus, have been proven effective for the general > > public. > > > Masking is now strongly recommended. Nothing about the virus or our > > > understanding of it has changed. > > > > > > YOUR MASK IS NOT A VIRUS CLUB MED > > > > > > Some people have argued that breathing into your mask sprays it chock > > full > > > oâvirus, and then youâll reinfect yourself constantly, like some kind > of > > > COVID Dutch oven. Firstly- anything that comes out of you was already > in > > > you, and canât make you sicker. Itâs sort of like how eating your own > arm > > > canât make you gain weight. And also remember, coronaviruses canât live > > > outside their host cell long. A trip outside into your mask is not a > > > relaxing day at the spa, itâs an event which results in likely viral > > > denaturing and degradation. > > > > > > That being said, you should launder your cloth mask in hot water > > > frequently. And donât handle anyone elseâs, because then you could get > > > their virus, and donât let them handle yours. > > > > > > JUST LIKE LOADING THE DISHWASHER, THEREâS ONE RIGHT WAY TO WEAR A MASK > > > > > > And that way is: over your mouth and nose. Not folded up on your chin. > > The > > > virus doesnât burrow into your beard, so no need to protect it. Thatâs > > the > > > equivalent of frisbee-ing in the plates into the bottom rack. > > > > > > I FEEL FINE. NO, REALLY. WHY SHOULD I WEAR A MASK? > > > > > > If youâre healthy and well you could easily be an asymptomatic case. > > > Remember up to 85% of transmission events are from people who feel > > > well and > > > therefore donât modify their behavior, so infect others. If you feel > > sick, > > > you should definitely wear a mask, to protect others (and you shouldnât > > be > > > out and about). If you are medically fragile you should wear a mask, to > > > protect others and yourself. > > > > > > I BELIEVE YOU MENTIONED NUMBERS > > > > > > Facemasking is the single most effective strategy to reduce COVID > > > transmission. NO MATTER THE RISK, FOR AN INDIVIDUAL OR A PLACE, ITâS > > LOWER > > > WITH MASKING. Summary of the evidence: > > > > > > -a mathematical model for COVID in New York and Washington shows: a) > > > if 80% > > > of people wear cloth masks which are 20% effective, mortality is > > > reduced by > > > up to 65% in low-prevalence Washington. đ In high-prevalence New York, > > > wearing 50% effective masks reduces mortality by up to 45%. (1) > > > THIS MODEL EQUATES MASK-WEARING TO THE REDUCTION IN BETA (#CONTACTS AN > > > INFECTIOUS CASE MAKES) SEEN IN VERY STRICT SOCIAL DISTANCING. MEANING > > > EPIDEMIOLOGICALLY, MASKS REPLACE LOCKDOWN. > > > > > > -a mathematical model for influenza showed if only 25% of people wore > > > masks > > > which were only 20% effective, there would be a 30% drop in > transmission. > > > (2) > > > > > > -Korean study showed 30% reduction in infectious SARS-CoV-2 with cloth > > > masks at 8 inches away from an infected person (3) > > > > > > -Hong Kong study showed masking was very effective at reducing > > > transmission > > > of alpha coronaviruses (4) > > > > > > -homemade cloth masks reduce influenza transmission by about 45% (5) > > > > > > -masks made from pillowcases and t-shirts are about 1/3 as effective as > > > medical grade masks (6) > > > > > > -homemade masks made from four layers of paper and 1 layer of cloth > were > > > 95% as effective as N-95s against aerosols (also 6) > > > > > > -98% of the populations of Hong Kong and Singapore have worn masks in > > > public since their COVID outbreaks, with phenomenal containment (7) > > > > > > SOURCES > > > > > > 1. Gunnel AB et al. To mask or not to mask: Modeling the potential for > > > face > > > mask use by the general public to curtail the COVID-19 pandemic. Inf > Dis > > > Model 5;293-308. > > > > > > 2. Tracht SMDV, Hyman J. Mathematical modeling of the effectiveness of > > > facemasks in reducing the spread of novel influenza A (H1N1). PLoS One > > > 2010;5(2)e:9018. > > > > > > 3. Kim SH et al. Effectiveness of Surgical and Cotton Masks in Blocking > > > SARSâCoV-2: A Controlled Comparison in 4 Patients. Ann Int Med > > > https://doi.org/10.7326/M20-1342 > > > > > > 4. Leung NHL et al. Respiratory virus shedding in exhaled breath and > the > > > efficacy of face masks. Nat. Med. 2020. > > > https://doi.org/10.1038/s41591-020-0843-2 > > > > > > 5. Long Y, Hu T, Liu L, Chen R, Guo Q, Yang L, Cheng Y, Huang J, Du L. > > > Effectiveness of N95 respirators versus surgical masks against > > > influenza: a > > > systematic review and metaâanalysis. J. Evid. Based Med. 2020. Mar 13. > > > https://doi.org/10.1111/jebm.12381 > > > > > > 6. Davies A, Thompson KâA, Giri K, Kafatos G, Walker J, Bennett A. > > Testing > > > the efficacy of homemade masks: would they protect in an influenza > > > pandemic? Disaster Med. Public Health Prep. 2013; 7: 413â 8. > > > > > > 7. Ma QâX, Shan H, Zhang HâL, Li GâM, Yang RâM, Chen JâM. Potential > > > utilities of mask wearing and instant hand hygiene for fighting > > > SARSâCoVâ2. > > > J. Med. Virol. 2020 Mar 31. https://doi.org/10.1002/jmv.25805 > > > > > > image: a bunch of masked people who are not zombies > > > > > > > > > > > > On Tue, May 19, 2020, 10:07 PM Max Dillon via Mercedes < > > > _______________________________________ > > > http://www.okiebenz.com > > > > > > To search list archives http://www.okiebenz.com/archive/ > > > > > > To Unsubscribe or change delivery options go to: > > > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > > > > > _______________________________________ > > http://www.okiebenz.com > > > > To search list archives http://www.okiebenz.com/archive/ > > > > To Unsubscribe or change delivery options go to: > > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > > > > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
