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His arrival at the hospital was a special day for the community as well because Saunders is trained in a specialized weapon against COVID-19 called ECMO or extracorporeal membrane oxygenation.

\"ECMO provides us a way to basically ... do the job of their lungs,\" Saunders said. \"Some people describe it as intravenous oxygen.\"

He told ABC News ECMO was \"really a treatment of last resort.\" Saunders is currently treating two patients with ECMO in the ICU.

He said that the hospital could do four to five patients on the treatment and that doctors screened patients carefully to decide which ones were the best candidates.

\"Obviously with so many people being so sick, ECMO is still a relatively scant resource so we have to use it very judiciously and apply it to patients who really are failing every other possible treatment strategy. ... We have to be very careful as to who we're going to offer it to and making sure that those patients are ones that are, really have a good chance of a good benefit,\" Saunders told ABC News.

Before he got sick, Saunders had administered the treatment to one of the patients at the medical center. The surgeon said he received updates from home on the patient’s condition and was able to stay on top of the patient's progress.

\"Everyone's really been, you know, pitching in and everyone wants to help,\" he said. \"People are working outside their normal comfort level but everyone's coming to work every day with good attitudes, really wants to get in there and take care of these patients. ... We see the best in our team, the best in our hospital, the best in our institution during times like this.\"

\"PHOTO:
ABC News
PHOTO: Dr. Paul Saunders, a heart surgeon, returned to work to treat COVID-19 patients at Maimonides Medical Center.
>

During an earlier visit to Maimonides, nurse Yosef \"Joe\" Kaydanov said the fight against coronavirus was \"literally a battle that's really hard to beat.\"

He told ABC News that he'd originally been skeptical about the severity of COVID-19 in the beginning.

\"I was one of the people that said, 'This is fake. This is not real. This is gonna be fine. We'll get over it. This is the flu,'\" Kaydanov said. \"It's not the flu. This is so far from the flu.\"

He said that people needed to see what was happening at Maimonides and hospitals across the U.S. during the pandemic and he encouraged residents to follow stay-at-home orders.

\"They need to see what it’s like,\" Kaydanov said. \"Just stay inside for a little bit, just a bit. Flatten that curve, get those infections down and you’ll see it get so much better, because you do not want to see what it’s like on the inside here. ... Nobody does.\"

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