Krista and Tatiana Hogan
Krista and Tatiana Hogan
Krista and Tatiana Hogan
October 25, 2006
Vernon, British Columbia, Canada
|Parent(s)||Brendan Hogan and Felicia Simms|
Krista and Tatiana Hogan (born October 25, 2006) are Canadians who are conjoined craniopagus twins. They are joined at the head (the top, back, and sides). They were born in Vancouver, British Columbia, and are the only unseparated conjoined twins of that type currently alive in Canada. They live with their mother, Felicia Simms, in Vernon, British Columbia, have two sisters and a brother and often travel to Vancouver for care at BC Children's Hospital and Sunny Hill Health Centre for Children.
Based on statistics, the twins were given a 20 percent chance of survival at birth. At birth at B.C. Women's Hospital & Health Centre, they were described as "wriggly, vigorous and very vocal." They weighed 12 and a half pounds when they were born by caesarean section.
Early infant life
Tatiana is smaller and less robust than Krista. Tests on them in April 2007 showed that Tatiana's heart was working harder than Krista's and that she had high blood pressure because of it—Tatiana's heart was supplying part of her blood to Krista's brain. A surgery was planned to give Krista's heart a "jump start" so Tatiana's would not have to work so hard.
The twins' nervous systems are highly interconnected. Their doctors reported that when one of them is tickled, the other jumps, and that putting a pacifier in the mouth of one could cause the other to stop crying.
The twins' birth, potential separation, depth of community support and their family's financial situation have been subject to significant media coverage in Canada. They and their mother were also guests on The Tyra Banks Show in the U.S.
In August 2007, it was declared the twins cannot be separated, due to the likelihood of the surgery killing or paralyzing one or both girls.
The family reduced the twins' public profile due to a contract giving exclusive access to a documentary crew for National Geographic and the Discovery Channel UK. The show was broadcast first in Britain in spring 2010, and then aired in June in Canada and the U.S.
The documentary followed a year in the twins' life and included a "particularly poignant" meeting between the family and Lori and George Schappell, 51, the world’s oldest twins to survive being joined at the head.
Progression to childhood
In January 2009, a documentary was filmed which reported on the twins, and followed their progress up to their third birthday. This documentary was released and aired in October, 2010. In this documentary, it was confirmed that they share a thalamus which connects their brainstems. Through this shared brain tissue structure and the interconnected neurons, one brain receives signals from the other brain and vice versa. This documentary also reported on experiments that were carried out that confirmed that visual cortex signals based on what one girl saw, were received by both girls' brains. So in effect, one twin could see what the other twin was seeing, making them unique even among craniopagus twins.
At this time, Tatiana suffered from a sleep apnea condition that occasionally caused her to stop breathing for up to 20 seconds. A sleep apnea specialist, Dr. Fred Kozak, surgically treated her sleep apnea. Not long after the surgery, her heart shrank to a more normal size and its rate dropped such that it no longer carried all of the burden of circulating blood for both brains.
The documentary reports that the twins are progressing well, and have achieved all the normal childhood milestones, such as walking, talking, and counting.
- "Doctors won't separate conjoined twins". Canada.com. 2007-08-04. Retrieved 2011-05-12.
- Statement from BC Women's regarding Felicia Simms delivery Archived 2007-06-19 at the Wayback Machine., News release, BC Women's Hospital & Health Centre, October 25, 2006
- The Twins Who Share a Brain
- "CTV British Columbia - Family learns B.C. twins can't be separated - CTV News, Shows and Sports - Canadian Television". Ctvbc.ctv.ca. 2007-08-03. Retrieved 2011-05-12.
- Tatiana and Krista on the move, By Ken MacQueen, Macleans. February 8, 2010.
- Today's TV, The Mirror, May 25, 2010
- Dominus, Susan (May 25, 2011). "Could Conjoined Twins Share a Mind?". New York Times. Retrieved 19 December 2012.
- Twins Who Share A Brain, Doc Zone Video documentary, October 14, 2010 CBC.ca
- The Hogan sisters; how conjoined twins share body and mind The Current, March 13, 2014
- "Inseparable: Ten Years Joined At The Head". June 27, 2019.
- Dominus, Susan (25 May 2011). "Could Conjoined Twins Share a Mind?". Magazine. The New York Times. Retrieved 17 September 2012.
- Squair, Jordan (2012). Sarwal, Amara (ed.). "Craniopagus: Overview and the implications of sharing a brain". University of British Columbia's Undergraduate Journal of Psychology. 1. Archived from the original on 1 January 2013. Retrieved 17 September 2012.
- Armstrong, Jane (14 December 2006). "Tissue 'bridge' joins twins' brains". The Globe and Mail. Retrieved 17 September 2012.
- The Twins, Article about the twins at About.com, www.about.com, retrieved on January 27, 2008
- Photos: At home with conjoined twins Tatiana and Krista Hogan, Windsor Star, 2014
- http://dailygleaner.canadaeast.com/canadaworld/article/458621(subscription required)