西安新高一正规哪家好(雁塔区提分学校正规好吗) (今日更新中)

While it’s always a bit sad when Christmas comes to an end each year, there is one silver lining — the amazing sales.From 134

Two centuries after its invention, the stethoscope — the very symbol of the medical profession — is facing an uncertain prognosis.It is threatened by hand-held devices that are also pressed against the chest but rely on ultrasound technology, artificial intelligence and smartphone apps instead of doctors’ ears to help detect leaks, murmurs, abnormal rhythms and other problems in the heart, lungs and elsewhere. Some of these instruments can yield images of the beating heart or create electrocardiogram graphs.Dr. Eric Topol, a world-renowned cardiologist, considers the stethoscope obsolete, nothing more than a pair of “rubber tubes.”It “was OK for 200 years,” Topol said. But “we need to go beyond that. We can do better.”In a longstanding tradition, nearly every U.S. medical school presents incoming students with a white coat and stethoscope to launch their careers. It’s more than symbolic — stethoscope skills are still taught, and proficiency is required for doctors to get their licenses.Over the last decade, though, the tech industry has downsized ultrasound scanners into devices resembling TV remotes. It has also created digital stethoscopes that can be paired with smartphones to create moving pictures and readouts.Proponents say these devices are nearly as easy to use as stethoscopes and allow doctors to watch the body in motion and actually see things such as leaky valves. “There’s no reason you would listen to sounds when you can see everything,” Topol said.At many medical schools, it’s the newer devices that really get students’ hearts pumping.“Wow!” ″Whoa!” ″This is awesome,” Indiana University medical students exclaimed in a recent class as they learned how to use a hand-held ultrasound device on a classmate, watching images of his lub-dubbing heart on a tablet screen.The Butterfly iQ device, made by based by Guilford, Connecticut-based Butterfly Network Inc., went on the market last year. An update will include artificial intelligence to help users position the probe and interpret the images.Students at the Indianapolis-based medical school, one of the nation’s largest, learn stethoscope skills but also get training in hand-held ultrasound in a program launched there last year by Dr. Paul Wallach, an executive associate dean. He created a similar program five years ago at the Medical College of Georgia and predicts that within the next decade, hand-held ultrasound devices will become part of the routine physical exam, just like the reflex hammer.The devices advance “our ability to take peek under the skin into the body,” he said. But Wallach added that, unlike some of his colleagues, he isn’t ready to declare the stethoscope dead. He envisions the next generation of physicians wearing “a stethoscope around the neck and an ultrasound in the pocket.”Modern-day stethoscopes bear little resemblance to the first stethoscope, invented in the early 1800s by Frenchman Rene Laennec, but they work essentially the same way.Laennec’s creation was a hollow tube of wood, almost a foot long, that made it easier to hear heart and lung sounds than pressing an ear against the chest. Rubber tubes, earpieces and the often cold metal attachment that is placed against the chest came later, helping to amplify the sounds.When the stethoscope is pressed against the body, sound waves make the diaphragm — the flat metal disc part of the device — and the bell-shaped underside vibrate. That channels the sound waves up through the tubes to the ears. Conventional stethoscopes typically cost under 0, compared with at least a few thousand dollars for some of the high-tech devices.But picking up and interpreting body sounds is subjective and requires a sensitive ear — and a trained one.With medical advances and competing devices over the past few decades, “the old stethoscope is kind of falling on hard times in terms of rigorous training,” said Dr. James Thomas, a cardiologist at Northwestern Medicine in Chicago. “Some recent studies have shown that graduates in internal medicine and emergency medicine may miss as many of half of murmurs using a stethoscope.”Northwestern is involved in testing new technology created by Eko, a Berkeley, California-based maker of smart stethoscopes. To improve detection of heart murmurs, Eko is developing artificial intelligence algorithms for its devices, using recordings of thousands of heartbeats. The devices produce a screen message telling the doctor whether the heart sounds are normal or if murmurs are present.Dennis Callinan, a retired Chicago city employee with heart disease, is among the study participants. At age 70, he has had plenty of stethoscope exams but said he feels no nostalgia for the devices.“If they can get a better reading using the new technology, great,” Callinan said.Chicago pediatrician Dr. Dave Drelicharz has been in practice for just over a decade and knows the allure of newer devices. But until the price comes down, the old stalwart “is still your best tool,” Drelicharz said. Once you learn to use the stethoscope, he said, it “becomes second nature.”“During my work hours in my office, if I don’t have it around my shoulders,” he said, “it’s as though I was feeling almost naked.” 5223

Watch live: Tune into a live stream of the debate in the video player below. Setting the stageThe first Democratic Party debate for the 2020 election cycle will include a record 20 participants with 10 candidates on stage at once. The debate will be divided between two nights - this Wednesday and Thursday. The debate will be aired on NBC, MSNBC and Telemundo from 9-11 p.m. ET both nights. The debate will be moderated by Savannah Guthrie, Lester Holt, Chuck Todd, Rachel Maddow and José Diaz-Balart. The rulesCandidates will have to talk fast as each candidate will only get 60 seconds to respond to each question and 30 seconds for follow-ups, according to NBC News. The candidates will not be afforded an opening statement, but will be allowed to deliver a closing statement. The candidatesThe Democratic National Committee used both polling and fundraising criteria to extend invitations to this week’s debate. Candidates needed to either have 65,000 donors or have at least 1 percent of the vote in a series of polls. The qualifying candidates were then split into two groups based on polling numbers. From there, the candidates were randomly picked for the two nights. Here is the lineup for Wednesday’s half of the debate: Sen. Cory Booker of New JerseySen. Elizabeth Warren of MassachusettsFormer Rep. Beto O'Rourke of TexasSen. Amy Klobuchar of MinnesotaFormer Rep. John Delaney of MarylandRep. Tulsi Gabbard of HawaiiFormer Housing Secretary Julián CastroRep. Tim Ryan of OhioNew York City Mayor Bill de BlasioWashington Gov. Jay InsleeHere is the lineup for Thursday’s half of the debate:Sen. Bernie Sanders of VermontSen. Kamala Harris of CaliforniaFormer Vice President Joe BidenMayor Pete Buttigieg of South Bend, IndianaSen. Michael Bennet of ColoradoAuthor Marianne WilliamsonRep. Eric Swalwell of CaliforniaSen. Kirsten Gillibrand of New YorkEntrepreneur Andrew YangGov. John Hickenlooper of Colorado.Why such a large field? One reason is many Democrats see an opportunity to win in 2020 with Trump’s disapproval rating consistently above 50 percent, according to Gallup. A second reason is that the DNC has changed its nominating rules, taking power away from so-called “Super Delegates” and allowing the primaries and caucuses to solely decide the party’s nominee. Isn’t this early for a debate?While the Democrats did not hold their first debate until 13 months before the general election in 2016 (there are still 16 months between now and the 2020 general election), that was relatively late. In 2008, the Democrats held their first debate more than 18 months before the general election. The Republicans held their first debate in 2016 less than 15 months before the election. In 2012, the GOP had its first debate 18 months out from the general election. In that case, it might have been a case of being too early. The May 2012 debate did not draw eventual nominee Mitt Romney to the stage. What the polls say?Like the Republicans in 2016, the Democrats have such a large field, all of the candidates could not fit on one stage. Unlike the Republicans, the Democrats opted to divide candidates between two debates at random rather than holding an “undercard” debate. But if polling is any indication, Thursday has the stronger candidates. Four of the top five candidates will be on the stage on Thursday, according to last week’s poll released by Mammoth University. Frontrunner Joe Biden along with Sen. Kamala Harris, Sen. Bernie Sanders and Mayor Pete Buttigieg will share a stage Thursday. Sen. Elizabeth Warren is the only candidate among the top 5 who will be on stage Wednesday. What will be discussed?President Donald Trump, obviously. A Mommouth University poll from February showed that electability is a strong consideration for Democrats. Of those surveyed, 56 percent of Democrats said that they would prefer a candidate who could beat Trump rather than a candidate they would agree with. Just 33 percent said the opposite. With that in mind, it is safe to say some candidates will go after Trump rather than trying to win points with policy. That doesn’t mean Democrats on the stage won’t be challenged. Will Biden be challenged on his comments about working with senators who supported segregation? Will Buttigieg be asked about his handling of a recent police-involved shooting in South Bend, Ind? What about Sanders’ plan to erase student loan debt in the US? These are all likely questions to come up. When are the primaries and caucuses?The first caucus is in Iowa on February 3. The first primary is eight days later. Arguably the most important day will be March 3 when at least 14 states are slated to vote. 4668

WASHINGTON— President Donald Trump booked back-to-back Memorial Day appearances amid the coronavirus pandemic. Trump first participated in a wreath-laying ceremony at Arlington National Cemetery on Monday. He was joined by first lady Melania Trump, Vice President Mike Pence, his defense secretary and other cabinet membersThe president laid a wreath at the Tomb of the Unknown Soldier overlooking rolling hills dotted with white tombstones. Presidents typically honor fallen military members by laying a wreath and delivering a speech at the hallowed burial ground across the Potomac River from Washington. But the pandemic has led to changes this year because of restriction on gatherings.Watch the ceremony below:Next, the president headed to Baltimore to speak at the Fort McHenry National Monument. It’s where the hoisting of a huge American flag to celebrate an important victory over the British during the War of 1812 inspired “The Star-Spangled Banner.”Watch the Baltimore event below:Baltimore's mayor is unhappy about Trump's visit, saying it sets a bad example when many residents have been told to limit travel. Mayor Bernard C. “Jack” Young also says the city can't afford the cost of a presidential visit when city revenue is declining because of the virus outbreak. 1293

We were just involved in a fatal accident with a driver going the wrong way on Veteran’s Highway as we were leaving Myrtle Beach. Thank God we are all okay. I feel so bad for those who died needlessly tonight. I’m really shaken up by what I witnessed. God bless those who died. pic.twitter.com/zcfRK7XxFc— Travis Tritt (@Travistritt) May 18, 2019 358

来源：资阳报