Grey's Anatomy (season 14)

Grey's Anatomy (season 14)

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Grey's Anatomy (season 14)
Grey's Anatomy season 14 poster.jpg
Promotional poster
Starring
  • Ellen Pompeo
  • Justin Chambers
  • Chandra Wilson
  • James Pickens, Jr.
  • Kevin McKidd
  • Jessica Capshaw
  • Sarah Drew
  • Jesse Williams
  • Caterina Scorsone
  • Camilla Luddington
  • Kelly McCreary
  • Jason George
  • Martin Henderson
  • Giacomo Gianniotti
Country of origin United States
No. of episodes 12
Release
Original network ABC
Original release September 28, 2017 (2017-09-28) – present
Season chronology
← Previous
Season 13
List of Grey's Anatomy episodes

The fourteenth season of the American television medical drama Grey's Anatomy was ordered on February 10, 2017, by American Broadcasting Company (ABC), and premiered on September 28, 2017 with a special two-hour premiere.[1] The season will consist of 24 episodes,[2][3] with the season's seventh episode marking the 300th episode for the series overall. The season is produced by ABC Studios, in association with Shondaland Production Company and The Mark Gordon Company; the showrunners being Krista Vernoff and William Harper.

This season is the first not to feature Jerrika Hinton as Dr. Stephanie Edwards since her introduction in the ninth season, following her departure at the conclusion of the previous season.[4] The season also marked the last appearance for Martin Henderson as a series regular.[5]

Contents

 [hide]
  • 1 Plots
  • 2 Cast
    • 2.1 Main cast
    • 2.2 Recurring cast
    • 2.3 Guest cast
    • 2.4 Casting
  • 3 Production
    • 3.1 Development
  • 4 Episodes
  • 5 Reception
    • 5.1 Live + SD ratings
    • 5.2 Live + 7 Day (DVR) ratings
  • 6 References

Plots[edit]

The season follows the story of surgical residents, fellows, and attendings as they experience the difficulties of the competitive careers they have chosen. It is set in the surgical wing of the fictional Grey Sloan Memorial Hospital, located in Seattle, Washington.

The season picks up right where it left off after the fire in the previous season finale. Grey-Sloan takes on a new, improved appearance after it is repaired of the damages from the fire. Meredith Grey (Ellen Pompeo) finds herself in another love triangle with Nathan Riggs (Martin Henderson) and his long-lost fiancée, Megan Hunt (Abigail Spencer), though she encourages Riggs to resume his relationship with Megan over her. Meredith performs a ground-breaking surgery on Megan, landing her a Harper Avery Award. Jackson Avery (Jesse Williams) and Maggie Pierce (Kelly McCreary) fiddle with the idea of a relationship after Jackson and April Kepner (Sarah Drew) decide to live apart.

Teddy Altman (Kim Raver) returns to Seattle to assist with Megan's reappearance and notices the tension in Owen and Amelia's relationship. With the help of DeLuca's sister, visiting doctor Carina DeLuca (Stefania Spampinato), Amelia Shepherd (Caterina Scorsone) discovers she has a brain tumor that has been impairing her judgment for the last 10 years. After it is removed by her former professor Tom Koracick (Greg Germann), Amelia and Owen Hunt (Kevin McKidd) decide to end their marriage. Meanwhile, after Alex Karev (Justin Chambers) reveals to Jo Wilson (Camilla Luddington) that he tracked down her husband, Alex and Jo reconcile their relationship, with Jo declaring that she will divorce Paul (Matthew Morrison).

A new class of interns is introduced, one of which has a history with Andrew DeLuca (Giacomo Gianniotti). Ben Warren (Jason George) joins to Fire Academy but has trouble telling his wife, Miranda Bailey (Chandra Wilson). Harper Avery (Chelcie Ross) threatens to pull funding from Grey-Sloan and fires Bailey as Chief, but he soon after passes away, reinstating Bailey in the position. After Eliza Minnick (Marika Domińczyk) is fired from Grey-Sloan, she ghosts Arizona Robbins (Jessica Capshaw), who subsequently begins dating Carina. Their relationship is short-lived, however, as Arizona inadvertently ends it while preparing for Sofia to return home from New York. Carina begins a sexual relationship with the newly single Owen.

Cast[edit]

Main articles: List of Grey's Anatomy cast members and List of Grey's Anatomy characters

Main cast[edit]

  • Ellen Pompeo as Dr. Meredith Grey
  • Justin Chambers as Dr. Alex Karev
  • Chandra Wilson as Dr. Miranda Bailey
  • James Pickens Jr. as Dr. Richard Webber
  • Kevin McKidd as Dr. Owen Hunt
  • Jessica Capshaw as Dr. Arizona Robbins
  • Sarah Drew as Dr. April Kepner
  • Jesse Williams as Dr. Jackson Avery
  • Caterina Scorsone as Dr. Amelia Shepherd
  • Camilla Luddington as Dr. Jo Wilson
  • Kelly McCreary as Dr. Maggie Pierce
  • Jason George as Dr. Ben Warren
  • Martin Henderson as Dr. Nathan Riggs
  • Giacomo Gianniotti as Dr. Andrew DeLuca

Recurring cast[edit]

  • Debbie Allen as Dr. Catherine Avery
  • Kim Raver as Dr. Teddy Altman[6]
  • Abigail Spencer as Dr. Megan Hunt[7]
  • Greg Germann as Dr. Tom Koracick[8]
  • Matthew Morrison as Dr. Paul Stadler[9]
  • Stefania Spampinato as Dr. Carina DeLuca[10]
  • Jake Borelli as Dr. Levi Schmitt[11]
  • Jeanine Mason as Dr. Sam Bello[11]
  • Alex Blue Davis as Dr. Casey Parker[11]
  • Rushi Kota as Dr. Vikram Roy[11]
  • Jaicy Elliot as Dr. Taryn Helm[11]
  • Sophia Taylor Ali as Dr. Dahlia Qadri[11]
  • Bethany Joy Lenz as Jenny
  • Candis Cayne as Dr. Michelle Velez[12]

Guest cast[edit]

  • Debra Mooney as Evelyn Hunt
  • Bill Smitrovich as Dr. Walter Carr
  • Chelcie Ross as Dr. Harper Avery
  • Kate Burton as Dr. Ellis Grey
  • Justin Bruening as Paramedic Matthew Taylor
  • Mark Moses as Dr. Larry Maxwell
  • Scott Speedman[13]

Casting[edit]

Series regular Jerrika Hinton does not appear for the first time since her introduction at the start of the 9th season, after it was announced she landed a starring role in Alan Ball's new HBO drama series Here, Now.[4] Hinton had previously been in talks of leaving the show at the end of the 12th season when she was cast in the Shondaland comedy pilot Toast, but ABC passed on the project.[14] Renewing her contract for another three seasons as Dr. Arizona Robbins after the eleventh season, Jessica Capshaw will return for the 14th season.[15] On June 20, 2017, it was announced that Kim Raver is set to reprise her role as Dr. Teddy Altman for a guest arc.[6] In August 2017, it was announced that Abigail Spencer would replace Bridget Regan as Megan Hunt for a multi-episode arc this season.[7] After recurring in the previous season as the controversial character, Eliza Minnick, it was announced in August 2017 that Marika Dominczyk would not return to the show. On September 13, 2017, another special guest star was announced in Greg Germann (Ally McBeal); though details of his role were not disclosed, it was revealed that his character's name would be Tom Koracick and he'd been seen in the episode "Go Big or Go Home."[8] His character turned out to be Amelia's neurosurgery mentor and he re-appeared in the subsequent episode entitled "Ain't That a Kick in the Head."

On October 26, 2017, it was announced that Martin Henderson's appearance in the fifth episode of the season would be his last.[16]

On October 9, 2017, the new group of interns to join the cast as of the fourth episode,"Ain't That a Kick in the Head," was announced to include Jeanine Mason (So You Think You Can Dance) as Sam, Alex Blue Davis as Casey, Rushi Kota as Vik, Jaicy Elliot as Taryn, Sophia Taylor Ali as Dahlia, and Jake Borelli as Levi.[11]

On January 31, 2018, it was announced that Candis Cayne would be joining the show as Dr. Michelle Velez for a multi-episode arc revolving around a transgender character receiving a ground breaking surgery. [17]

Production[edit]

Development[edit]

Grey's Anatomy was renewed for a 14th season on February 10, 2017.[3] It premiered on September 28, 2017, with a two-hour premiere.[1] Ellen Pompeo announced that she would be directing several episodes in the 14th season.[18] On April 28, 2017, veteran writer Krista Vernoff announced that she would return to the show as a writer after leaving the show after the seventh season.[19] On January 11, 2018, ABC released a six-episode web series following the new surgical interns at Grey Sloan Memorial Hospital. The web series was written by Barbara Kaye Friend and directed by series regular Sarah Drew.[20]

Episodes[edit]

Main article: List of Grey's Anatomy episodes

The number in the "No. overall" column refers to the episode's number within the overall series, whereas the number in the "No. in season" column refers to the episode's number within this particular season. "U.S. viewers in millions" refers to the number of Americans in millions who watched the episodes live.

No.
overall
No. in
season
Title Directed by Written by Original air date U.S. viewers
(millions)
294 1 "Break Down the House" Debbie Allen Krista Vernoff September 28, 2017 (2017-09-28) 8.07[21]
In a whirlwind of reunions and a Grey Sloan "major uplift," Meredith finds herself in a complicated love triangle between Nathan and Megan, Owen’s sister who was recently revealed to still be alive after a ten year absence in a hostage camp overseas. With Megan’s reappearance, Teddy Altman comes back to Seattle to support Owen and his mom, which leads to awkward interactions with Amelia. With Stephanie now in Texas at a burn unit, Jo eagerly tries to make Ben her new person. After being “ghosted” by Eliza, Arizona hits it off with an Italian girl in a bar whom she takes home with her. When DeLuca comes home, he finds his sister half-naked on his couch with Arizona.
295 2 "Get Off on the Pain" Kevin McKidd Krista Vernoff September 28, 2017 (2017-09-28) 8.07[21]
Carina, DeLuca’s sister, asks to be introduced to Bailey in order to get approval to study the controversial topic of female masturbation and orgasms at her hospital; Bailey obliges due to society's double standard. Meredith works to get everyone to agree that an abdominal wall transplant is the best tactic to treat Megan’s wounds; she even gets Teddy to scrub in to erase any doubts of Meredith’s intentions of being Megan’s surgeon. Jo tries to mend her relationship with Alex, after it’s revealed that Jo slept with one of the new sub-interns. Owen gets called out on his marital status with Amelia, who seems to be avoiding him and his family. Even without the support of Jackson, Amelia fights to remove a patient’s mastoid tumor. She later takes part in Carina's study which leads to her finding a huge tumor in her own brain.
296 3 "Go Big or Go Home" Chandra Wilson Meg Marinis October 5, 2017 (2017-10-05) 8.06[22]
Amelia brings in one of her former professors and current head of Neurology at Johns Hopkins, Dr. Tom Koracik to help her come up with a treatment plan for her tumor. Much to her chagrin, Dr Koracik brings to light how impaired her judgment has been over the last ten years; Richard makes sure to let Amelia know that her judgment hasn’t been all that bad and encourages her to come clean to those with whom she’s closest. Bailey is confronted by Harper Avery about all the changes that have been made to the hospital and threatens to withdraw all funding from the foundation; when Bailey stands up to him, Avery fires her. In the end of the episode Avery passes away with a sudden cardiac arrest and then Jackson and Catherine Avery reinstate Bailey back as the chief. Ben and Arizona resort to advice delivered by Carina when one of their patients gets stuck in labor. Meredith turns to her former psychiatrist, who winds up as a patient, to sort out her mood towards everyone instigated by the love triangle involving Nathan and Megan. Jo asks Alex to move back home.
297 4 "Ain't That a Kick in the Head?" Geary McLeod Marlana Hope October 12, 2017 (2017-10-12) 8.08[23]
Amelia has her brain tumor removed, but in the days following, she experiences some complications, such as speaking only French, and memory loss. Richard unexpectedly brings Maggie to attend a family dinner hosted by Catherine, which turns awkward when Catherine discloses to Avery his inheritance from Harper’s passing, a quarter billion dollars. Bailey and Richard host interviews with prospective new interns but fail to find a decent candidate. Using her research to justify his entry into the country, Meredith and Nathan team up to bring Megan’s adopted son to America. Amelia and Owen face their fear that their marriage is based on a version of Amelia created by her illness. Arizona learns that Sofia wants to move home. Jo confesses that she hates how much control her ex-husband has over her.
298 5 "Danger Zone" Cecilie Mosli Jalysa Conway October 26, 2017 (2017-10-26) 7.67[24]
As Owen helps Megan make the trip to California where she’ll start her new life with Nathan and her son, Farouk, they reminisce on their time spent in Fallujah, Iraq. During their time overseas, Nathan proposed to Megan by recycling a necklace that wasn’t initially intended for her. Teddy quickly recognized the necklace and the fact that Nathan cheated and pushed him to come clean. Despite the good news of the engagement, Megan dealt with heartbreak of not making strat, which is later revealed to her as Owen’s own doing. Distraught over her brother's betrayal, she gets on a helicopter with one of the shooters who attacked their troops, leading to her disappearance. While Nathan awaits the arrival of Megan and Owen, he bonds with Farouk, who is having trouble acclimating to the free world. He also officially ends his relationship with Meredith, as does Owen with Amelia when he comes to terms with the notion that neither of them are truly happy.
299 6 "Come On Down to My Boat, Baby" Lisa Leone Kiley Donovan November 2, 2017 (2017-11-02) 7.38[25]
As the new surgeon on the cover page of the medical journal, JSA, Meredith performs a rare surgical procedure, made possible by Jo’s persuasion, to try and save a judge from his progressive cancer diagnosis. The men of Grey Sloan take a “sick day” and hang out on a Jackson’s newly purchased boat, whereas the women swipe for dates on Tinder. Arizona has broken up with Carina in preparation of Sofia moving back home. Amelia heads back to surgery but struggles with her confidence, recruiting the help of Dr. Koracik and seeking the encouragement of Richard. While Arizona and April repair a woman’s injuries caused by an accidental firing of a gun that was hidden inside her vagina, Bailey and Maggie take care of a hypochondriac who was a victim of the accidental shooting. At the surgeon-intern mixer, Meredith learns that she's been nominated for the annual Harper Avery award; however, the news is overshadowed by the loss of her patient. Jackson gives half his inheritance to Bailey to fund a research competition. Jo learns she's in the running for chief resident and decides to file for divorce from Paul after confiding her situation to the judge. DeLuca recognizes one of the new interns from his past, while Owen and Carina are caught kissing.
300 7 "Who Lives, Who Dies, Who Tells Your Story" Debbie Allen Krista Vernoff November 9, 2017 (2017-11-09) 8.13[26]
When a roller coaster car derails off its tracks, Meredith’s plans to attend the Harper Avery award ceremony are put on hold. Three patients visiting the ER look like former doctors of the hospital: Drs. Cristina Yang, George O’Malley, and Izzie Stevens. Amelia and Owen learn to co-exist in the OR, after Amelia orders a surprise CT which shows a large hematoma that she is able to repair. As Arizona performs surgery on Liza, Izzie’s look-a-like, she reflects on her relationship with Callie and Mark in preparation for Sofia’s return to Seattle. Jo probes Alex to call Izzie and see how she is, to which Alex says he knows how she is: a happily married surgeon with three children. As they wait on Meredith to leave for Boston, Maggie bonds with Zola as they rehearse medical knowledge and talk about Derek. Bailey and Ben fight over his announcement to join the fire department, due to Bailey’s fear that he has commitment issues. Unable to fly out to Boston, in an OR—in front of her friends and colleagues—Meredith is announced the winner of the 2017 Harper Avery award.
301 8 "Out of Nowhere" Kevin McKidd William Harper November 16, 2017 (2017-11-16) 7.52[27]
As the interns struggle to find their stride as surgeons, Jo begins her reign as chief resident. Things take a turn for the worse when the computer system gets hacked at Grey Sloan Memorial, as all of the patients’ records get held hostage for $20 million. Unable to understand why the ransom is so large and unprecedented, Bailey realizes it’s due to the recently announced competition funded by Jackson’s inheritance. Without the use of the technological advancements to which the doctors have become accustomed, they must rely on their instincts to treat their patients; Richard teaches his younger colleagues about how they worked in the “Stone Age.” One patient is transported to another hospital by a helicopter which encounters bad turbulence, causing a line to loosen and squirt blood everywhere. Jo gets the scariest surprise of her life when she runs into her abusive husband, Paul, on her way to stop Alex from inadvertently killing their patient.
302 9 "1-800-799-7233" Bill D'Elia Andy Reaser January 18, 2018 (2018-01-18) 8.27[28]

While the staff of the hospital fawns over Dr. Paul Stadler and his legendary work as a surgeon, Jo tries to steer clear of him. Alex and Meredith team up to do their best to protect Jo during the process of filing for divorce. Drenched in blood, Jackson and Maggie save their patient’s life, and then bond in the locker room after showers; April and Owen use their trauma skills to work on patients in less than ideal and extremely hot conditions, very similar to when they were overseas. Bailey works with an exceptionally computer-savvy intern to take back the power against those who hacked the hospital; this intern later outs himself as "a proud trans man." After Paul’s fiancée, Jenny, tells him about her secret exchange with Jo, Meredith has to pretend to call in security to remove Paul from the hospital. However, he soon winds back up in the ER as a victim of a hit-and-run.

The episode was followed by a PSA of Camilla Luddington reminding viewers that psychological abuse is a form of domestic violence and providing the number of the National Domestic Violence Hotline: 1-800-799-7233, the episode's title.
303 10 "Personal Jesus" Kevin Sullivan Zoanne Clack January 25, 2018 (2018-01-25) 8.62[29]
With Paul recovering from surgery, Meredith questions the alibi that Alex and Jo provide her. Believing that it’s his fiancée, Jenny, who ran him over, Jo feels the need to consult her. April’s patient turns out to be the pregnant wife of her ex-fiancé, Matthew, proving to be more than an awkward situation, as she helps deliver their baby, and then watches him deal with his wife’s unexpected death. Jackson, Bailey, and April are confronted with racial profiling when police show up with a handcuffed 12-year-old boy whom they shot when he was seen trying to enter his own home by a window. Police officers continue to treat him like a criminal in the ER, prompting Bailey and Ben to give Tucker “the talk.” When Jo and Jenny go to Paul’s room to announce they are taking him to court, he gets in a bout of rage and falls out of his bed, knocking himself out and becoming brain dead. Still legally his wife, Jo decides to take him off life support and have his organs donated. April ends up in the shower with Roy, an intern, after she finds herself questioning her faith.
304 11 "(Don't Fear) the Reaper" Nicole Rubio Elisabeth R. Finch February 1, 2018 (2018-02-01) 8.93[30]
With her intuition and the more subtle signs of a heart attack, Bailey winds up in the ER at Seattle Presbyterian; however, after her doctors treat her condescendingly, assuming she's imagining the heart attack and really just suffering from her OCD, she calls on Maggie to come save her. When Maggie arrives, she runs into Richard who found his way there based on Bailey’s record of attendance. With her life flashing before her eyes, Bailey reflects on her upbringing and her past as a surgeon with all the stressful fights and struggles she’s gone through to get to this point in her life. Right before she goes under for emergency surgery to save her life, Bailey asks Maggie to call Ben who is able to get there before she wakes up. Ben announces that he’s quit being a firefighter, but Bailey demands that he go back and never do anything other than what he truly loves.
305 12 "Harder, Better, Faster, Stronger" Jeannot Szwarc Kiley Donovan February 8, 2018 (2018-02-08) 7.32[31]
As the contest draws near, a competitive edge and tension arise between the doctors and their selected interns vying for millions of dollars. In preparation to surprise Catherine on her birthday, Richard takes salsa dancing lessons with Maggie, who is struggling with the one year anniversary of her mother’s death. Amelia and Alex tag team a pediatric case, in order to save their patient’s ability to sing, as well as retain all mental capabilities. Meredith gets a visit from an old splenectomy patient, who’s back with multiple miniature spleens, which guides Meredith to her idea for the competition, and Jackson gets pulled into his mother’s gender confirmation proposal, despite his wishes.
306 13 "You Really Got a Hold on Me"[32] Nzingha Stewart Stacy McKee March 1, 2018 (2018-03-01) TBD
307 14 "Games People Play"[33] Chandra Wilson Jason Ganzel & Julie Wong March 8, 2018 (2018-03-08) TBD

Reception[edit]

Live + SD ratings[edit]

No. in
series
No. in
season
Episode Air date Time slot (EST) Rating/Share (18–49) Viewers (m) 18–49 Rank Viewership rank Drama rank
294 1 "Break Down the House" September 28, 2017 (2017-09-28) Thursday
8:00 p.m.
2.3/8[21] 8.07[21] 12[34] 24[34] 3[34]
295 2 "Get Off on the Pain" September 28, 2017 (2017-09-28) Thursday
9:00 p.m.
2.3/8[21] 8.07[21] 12[34] 24[34] 3[34]
296 3 "Go Big or Go Home" October 5, 2017 (2017-10-05) Thursdays
8:00 p.m.
2.1/8[22] 8.06[22] 11[35] 21[35] 3[35]
297 4 "Ain't That a Kick in the Head?" October 12, 2017 (2017-10-12) 2.1/8[23] 8.08[23] 10[36] 17[36] 2[36]
298 5 "Danger Zone" October 26, 2017 (2017-10-26) 1.8/7[24] 7.67[24] 14[37] 22[37] 3[37]
299 6 "Come On Down to My Boat, Baby" November 2, 2017 (2017-11-02) 1.8/7[25] 7.38[25] 13[38] 21[38] 3[38]
300 7 “Who Lives, Who Dies, Who Tells Your Story” November 9, 2017 (2017-11-09) 1.9/7[26] 8.13[26] 11[39] 19[38] 2[38]
301 8 “Out of Nowhere” November 16, 2017 (2017-11-16) 1.8/7[27] 7.52[27] 13[40] 21[40] 4[40]
302 9 "1-800-799-7233" January 18, 2018 (2018-01-18) 2.3/9[28] 8.27[28] 7[41] 14[41] 3[41]
303 10 "Personal Jesus" January 25, 2018 (2018-01-25) 2.3/9[29] 8.62[29] 3[42] 7[42] 2[42]
304 11 "(Don't Fear) the Reaper" February 1, 2018 (2018-02-01) 2.3/9[30] 8.93[30] 5[43] 8[43] 2[43]
305 12 "Harder, Better, Faster, Stronger" February 8, 2018 (2018-02-08) 2.0/8[31] 7.32[31] 6[44] 13[44] 2[44]
306 13 "You Really Got a Hold on Me" March 1, 2018 (2018-03-01)

Live + 7 Day (DVR) ratings[edit]

No. in
series
No. in
season
Episode Air date Time slot (EST) 18–49 increase Viewers
(millions) increase
Total 18-49 Total viewers
(millions)
Ref
294 1 "Break Down the House" September 28, 2017 (2017-09-28) Thursday
8:00 p.m.
1.6 3.91 3.9 11.99 [45]
295 2 "Get Off on the Pain" September 28, 2017 (2017-09-28) Thursday
9:00 p.m.
1.6 3.91 3.9 11.99 [45]
296 3 "Go Big or Go Home" October 5, 2017 (2017-10-05) Thursdays
8:00 p.m.
1.6 3.83 3.7 11.89 [46]
297 4 "Ain't That a Kick in the Head?" October 12, 2017 (2017-10-12) 1.4 3.51 3.5 11.59 [47]
298 5 "Danger Zone" October 26, 2017 (2017-10-26) 1.5 3.54 3.3 11.22 [48]
299 6 "Come On Down to My Boat, Baby" November 2, 2017 (2017-11-02) 1.5 3.45 3.2 10.84 [49]
300 7 “Who Lives, Who Dies, Who Tells Your Story” November 9, 2017 (2017-11-09) 1.5 3.53 3.4 11.67 [50]
301 8 “Out of Nowhere” November 16, 2017 (2017-11-16) 1.5 3.54 3.3 11.07 [51]
302 9 "1-800-799-7233" January 18, 2018 (2018-01-18) 1.3 3.30 3.6 11.58 [52]
303 10 "Personal Jesus" January 25, 2018 (2018-01-25) 1.3 3.35 3.6 11.98 [53]
304 11 "(Don't Fear) The Reaper" February 1, 2018 (2018-02-01) 1.4 3.41 3.7 12.35 [54]
305 12 "Harder, Better, Faster, Stronger" February 8, 2018 (2018-02-08)
306 13 "You Really Got a Hold on Me" March 1, 2018 (2018-03-01)

References[edit]

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  25. ^ Jump up to: a b c Porter, Rick (November 3, 2017). "'Will & Grace' adjusts up, 'Sheldon' and other CBS shows adjust down: Thursday final ratings". TV by the Numbers. Retrieved November 3, 2017.
  26. ^ Jump up to: a b c Porter, Rick (November 10, 2017). "'Big Bang Theory' and 'Thursday Night Football' adjust up: Thursday final ratings". TV by the Numbers. Retrieved November 10, 2017.
  27. ^ Jump up to: a b c Porter, Rick (November 17, 2017). "'Supernatural' and NFL adjust up, 'Young Sheldon' adjusts down: Thursday final ratings". TV By the Numbers. Retrieved November 17, 2017.
  28. ^ Jump up to: a b c Porter, Rick (January 22, 2018). "'Grey's Anatomy' adjusts up, 'The Four,' 'Scandal' and 'Great News' down: Thursday final ratings". TV by the Numbers. Retrieved January 22, 2018.
  29. ^ Jump up to: a b c Porter, Rick (January 26, 2018). "'Grey's Anatomy' adjusts up, 'Big Bang Theory' adjusts down: Thursday final ratings". TV by the Numbers. Retrieved January 26, 2018.
  30. ^ Jump up to: a b c Porter, Rick (February 2, 2018). "'Big Bang Theory,' 'The Four' adjust up, 'Mom' and 'AP Bio' adjust down: Thursday final ratings". TV by the Numbers. Retrieved February 2, 2018.
  31. ^ Jump up to: a b c Porter, Rick (February 9, 2018). "Olympics adjust up: Thursday final ratings". TV by the Numbers. Retrieved February 9, 2018.
  32. Jump up ^ "(#1413) "You Really Got a Hold on Me"". The Futon Critic. Retrieved February 16, 2018.
  33. Jump up ^ "(#1414) "Games People Play"". The Futon Critic. Retrieved February 16, 2018.
  34. ^ Jump up to: a b c d e f Porter, Rick (October 3, 2017). "'Big Bang Theory,' 'Sunday Night Football' score in week 1 broadcast Top 25 and network rankings". TV by the Numbers. Retrieved October 3, 2017.
  35. ^ Jump up to: a b c Porter, Rick (October 10, 2017). "NFL times 2 dominates the week 2 broadcast Top 25 and network rankings". TV by the Numbers. Retrieved October 11, 2017.
  36. ^ Jump up to: a b c Porter, Rick (October 17, 2017). "NFL, 'Big Bang Theory' and 'NCIS' lead week 3's broadcast Top 25 and network rankings". TV by the Numbers. Retrieved October 17, 2017.
  37. ^ Jump up to: a b c Porter, Rick (October 31, 2017). "World Series makes FOX No. 1 in week 5's broadcast Top 25 and network rankings". TV by the Numbers. Retrieved November 1, 2017.
  38. ^ Jump up to: a b c d e Porter, Rick (November 7, 2017). "World Series, 'Big Bang Theory' lead week 6 broadcast Top 25 and network rankings". TV by the Numbers. Retrieved November 7, 2017.
  39. Jump up ^ Porter, Rick (November 14, 2017). "NFL and 'This Is Us' carry NBC to victory in week 7 broadcast Top 25 and network rankings". TV by the Numbers. Retrieved November 14, 2017.
  40. ^ Jump up to: a b c Porter, Rick (November 21, 2017). "NFL carries NBC to victory again: Week 8 broadcast Top 25 and network rankings". TV By the Numbers. Retrieved November 22, 2017.
  41. ^ Jump up to: a b c Porter, Rick (January 23, 2018). "FOX dominates, ABC gets a boost in week 17 broadcast Top 25 and network rankings". TV By the Numbers. Retrieved January 23, 2018.
  42. ^ Jump up to: a b c Porter, Rick (January 30, 2018). "Grammys and 'NCIS' carry CBS to victory: Week 18 broadcast Top 25 and network rankings". TV By the Numbers. Retrieved January 30, 2018.
  43. ^ Jump up to: a b c Porter, Rick (February 6, 2018). "Super Bowl LII (obviously) dominates week 19's broadcast Top 25 and network rankings". TV By the Numbers. Retrieved February 6, 2018.
  44. ^ Jump up to: a b c Porter, Rick (February 13, 2018). "Olympics push NBC to No. 1 for the season: Week 20 broadcast Top 25 and network rankings". TV By the Numbers. Retrieved February 13, 2018.
  45. ^ Jump up to: a b Porter, Rick (October 13, 2017). "'This Is Us' and 'The Good Doctor' score big in premiere week broadcast Live +7 ratings". TV by the Numbers. Retrieved October 13, 2017.
  46. Jump up ^ Porter, Rick (October 18, 2017). "'The Orville,' 'Once Upon a Time,' 5 more shows double in week 2 broadcast Live +7 ratings". TV by the Numbers. Retrieved October 19, 2017.
  47. Jump up ^ Porter, Rick (October 25, 2017). "'The Good Doctor' is the most-watched show on TV in week 3 broadcast Live +7 ratings". TV by the Numbers. Retrieved October 25, 2017.
  48. Jump up ^ Porter, Rick (November 9, 2017). "'Grey's Anatomy' keeps rolling along in week 5 broadcast Live +7 ratings". TV by the Numbers. Retrieved November 9, 2017.
  49. Jump up ^ Porter, Rick (November 17, 2017). "'This Is Us' and 12 more shows double in week 6 broadcast Live +7 ratings". TV by the Numbers. Retrieved November 17, 2017.
  50. Jump up ^ Porter, Rick (November 27, 2017). "'This Is Us' rides high in week 7 broadcast Live +7 ratings". TV by the Numbers. Retrieved November 27, 2017.
  51. Jump up ^ Porter, Rick (December 5, 2017). "'Jane the Virgin,' 10 other shows double in week 8 broadcast Live +7 ratings". TV by the Numbers. Retrieved December 5, 2017.
  52. Jump up ^ Porter, Rick (February 1, 2018). "'This Is Us,' 'The Good Doctor' both double in week 17 broadcast Live +7 ratings". TV by the Numbers. Retrieved February 1, 2018.
  53. Jump up ^ Porter, Rick (February 8, 2018). "'This Is Us' sets NBC records in week 18 broadcast Live +7 ratings". TV by the Numbers. Retrieved February 8, 2018.
  54. Jump up ^ Porter, Rick (February 15, 2018). "Closing the book on the Super Bowl 'This Is Us': Week 19 broadcast Live +7 ratings". TV by the Numbers. Retrieved February 15, 2018.
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Blood gas tension

Blood gas tension

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Blood gas tension refers to the partial pressure of gases in blood.[1] There are several significant purposes for measuring gas tension;[2] the most common gas tensions measured are oxygen tension[3] (PxO2), the carbon dioxide tension[3] (PxCO2) and carbon monoxide tension[3] (PxCO). The subscript x in each symbol represents the source of the gas being measured; "a" meaning arterial,[3] "A" being alveolar,[3] "v" being venous,[3] "c" being capillary.[3] Blood gas tests (such as arterial blood gas tests) measure these partial pressures.

Contents

 [hide]
  • 1 Oxygen tension
  • 2 Carbon dioxide tension
  • 3 Carbon monoxide tension
  • 4 Significance
  • 5 Equations
    • 5.1 Oxygen content
    • 5.2 Oxygen saturation
  • 6 See also
  • 7 References

Oxygen tension[edit]

Arterial blood oxygen tension (normal)

PaO2 – Partial pressure of oxygen at sea level (765 mmHg) in arterial blood is between 75 mmHg and 100 mmHg.[4][5][6]

Venous blood oxygen tension (normal)

PvO2 – Oxygen tension in venous blood at sea level is between 30 mmHg and 40 mmHg.[6][7]

Carbon dioxide tension[edit]

Carbon dioxide is a by-product of food metabolism and in high amounts has toxic effects including: dyspnea, acidosis and altered consciousness.[8]

Arterial blood carbon dioxide tension

PaCO2 – Partial pressure of carbon dioxide at sea level (765 mmHg) in arterial blood is between 35 mmHg and 45 mmHg.[9]

Venous blood carbon dioxide tension

PvCO2 – Partial pressure of carbon dioxide at sea level in venous blood is between 40 mmHg and 50 mmHg.[9]

Carbon monoxide tension[edit]

Arterial carbon monoxide tension (normal)

PaCO – Partial pressure of CO at sea level (765 mmHg) in arterial blood is approximately 0.02. It can be slightly higher in smokers and people living in dense urban areas.

Significance[edit]

The partial pressure of gas in blood is significant because it is directly related to ventilation and oxygenation.[10] When used alongside the pH balance of the blood, the PaCO2 and HCO3 (and Lactate) suggest to the health care practitioner which interventions, if any, should be made.[10][11]

Equations[edit]

Oxygen content[edit]

C a O 2 = 1.36 ∗ H g b ∗ S a O 2 100 + 0.0031 ∗ P a O 2 {\displaystyle C_{a}O_{2}=1.36*Hgb*{\frac {S_{a}O_{2}}{100}}+0.0031*P_{a}O_{2}} C_{a}O_{2}=1.36*Hgb*{\frac  {S_{a}O_{2}}{100}}+0.0031*P_{a}O_{2}

The constant, 1.36, is the amount of oxygen (ml at 1 atmosphere) bound per gram of hemoglobin. The exact value of this constant varies from 1.34 to 1.39, depending on the reference and the way it is derived. The constant 0.0031 represents the amount of oxygen dissolved in plasma. The dissolved-oxygen term is generally small relative to the term for hemoglobin-bound oxygen, but becomes significant at very high PaO2 (as in a hyperbaric chamber) or in severe anemia.[12]

Oxygen saturation[edit]

S O 2 = ( 23 , 400 p O 2 3 + 150 p O 2 + 1 ) − 1 {\displaystyle SO_{2}=({\frac {23,400}{pO_{2}^{3}+150pO_{2}}}+1)^{-1}} SO_{2}=({\frac  {23,400}{pO_{2}^{3}+150pO_{2}}}+1)^{{-1}}

This is an estimation and does not account for differences in temperature, pH and concentrations of 2,3 DPG.[13]

See also[edit]

  • Alveolar air equation
  • Fick's laws of diffusion

References[edit]

  1. Jump up ^ Severinghaus JW, Astrup P, Murray JF (1998). "Blood gas analysis and critical care medicine". Am J Respir Crit Care Med. 157 (4 Pt 2): S114–22. PMID 9563770. doi:10.1164/ajrccm.157.4.nhlb1-9.
  2. Jump up ^ Bendjelid K, Schütz N, Stotz M, Gerard I, Suter PM, Romand JA (2005). "Transcutaneous PCO2 monitoring in critically ill adults: clinical evaluation of a new sensor". Crit Care Med. 33 (10): 2203–6. PMID 16215371. doi:10.1097/01.ccm.0000181734.26070.26.
  3. ^ Jump up to: a b c d e f g Yildizdaş D, Yapicioğlu H, Yilmaz HL, Sertdemir Y (2004). "Correlation of simultaneously obtained capillary, venous, and arterial blood gases of patients in a paediatric intensive care unit". Arch Dis Child. 89 (2): 176–80. PMC 1719810 Freely accessible. PMID 14736638. doi:10.1136/adc.2002.016261.
  4. Jump up ^ Shapiro BA (1995). "Temperature correction of blood gas values". Respir Care Clin N Am. 1 (1): 69–76. PMID 9390851.
  5. Jump up ^ Malatesha G, Singh NK, Bharija A, Rehani B, Goel A (2007). "Comparison of arterial and venous pH, bicarbonate, PCO2 and PO2 in initial emergency department assessment". Emerg Med J. 24 (8): 569–71. PMC 2660085 Freely accessible. PMID 17652681. doi:10.1136/emj.2007.046979.
  6. ^ Jump up to: a b Chu YC, Chen CZ, Lee CH, Chen CW, Chang HY, Hsiue TR (2003). "Prediction of arterial blood gas values from venous blood gas values in patients with acute respiratory failure receiving mechanical ventilation". J Formos Med Assoc. 102 (8): 539–43. PMID 14569318.
  7. Jump up ^ Walkey AJ, Farber HW, O'Donnell C, Cabral H, Eagan JS, Philippides GJ (2010). "The accuracy of the central venous blood gas for acid-base monitoring". J Intensive Care Med. 25 (2): 104–10. PMID 20018607. doi:10.1177/0885066609356164.
  8. Jump up ^ Adrogué HJ, Rashad MN, Gorin AB, Yacoub J, Madias NE (1989). "Assessing acid-base status in circulatory failure. Differences between arterial and central venous blood". N Engl J Med. 320 (20): 1312–6. PMID 2535633. doi:10.1056/NEJM198905183202004.
  9. ^ Jump up to: a b Williams AJ (1998). "ABC of oxygen: assessing and interpreting arterial blood gases and acid-base balance". BMJ. 317 (7167): 1213–6. PMC 1114160 Freely accessible. PMID 9794863. doi:10.1136/bmj.317.7167.1213.
  10. ^ Jump up to: a b Hansen JE (1989). "Arterial blood gases". Clin Chest Med. 10 (2): 227–37. PMID 2661120.
  11. Jump up ^ Tobin MJ (1988). "Respiratory monitoring in the intensive care unit". Am Rev Respir Dis. 138 (6): 1625–42. PMID 3144222. doi:10.1164/ajrccm/138.6.1625.
  12. Jump up ^ "Oxygen Content". Retrieved October 7, 2014.
  13. Jump up ^ Severinghaus, J. W. (1979). "Simple, accurate equations for human blood O2 dissociation computations" (PDF). J Appl Physiol. 46 (3): 599–602. PMID 35496.
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