Emergency/Critical Care

Mission Statement

The Emergency and Critical Care Service working closely with your regular veterinarian will make available the highest level of care for patients and their owners. We will provide around-the-clock services every day, so that no matter when a situation arises, quality veterinary care is available. We welcome challenging, complicated cases and have an ongoing commitment to approach diagnostics and treatments aggressively. We will always provide and have access to specialized medical and surgical procedures as well as advanced in-house diagnostics. We will approach all patients with the knowledge that they are cherished family members. We are devoted to providing a caring environment that treats people and animals with dignity, kindness and respect.

Emergency/Critical Care

Behind the name…

  • Dr. Kimberly Bridges is a native of south-east Virginia. She attended Virginia Tech University where she received undergraduate degrees in Animal Science and Biology. She went on to get her doctorate of veterinary medicine at Western University of Health Sciences in California. Dr. Bridges then did a rotating internship in small animal medicine and surgery at Oradell Animal Hospital in New Jersey. Dr Bridges then went on to complete a residency at the New England Animal Medical Center in Massachusetts in emergency medicine and critical care. She has a special interest in sepsis, coagulopathy, trauma, and transfusion medicine. Outside of the hospital, she has a passion for volunteering with the Rural Area Veterinary Services to provide veterinary care to impoverished communities while also serving as a mentor to veterinary students. Dr. Bridges enjoys spending her free time with her husband (also an emergency veterinarian) and dog Nala, hiking, fishing, reading, or just relaxing on a beach.

  • Dr. Randall Derbin is originally from northeastern Pennsylvania.  He spent his undergraduate days at Penn State University where he received his degree in biochemistry and animal bioscience. He went to the University Of Pennsylvania School Of Veterinary Medicine where he received his veterinary degree in 2001.  The following year, he completed his internship at a local referral practice.  He has since been practicing emergency medicine in the area and has been at RVRC for over 10 years. He currently resides in Ashburn with his wife and three dogs, Lilly, Briggs and Pete and three horses, Ellie, Dewey and Skippy.  He has a strong interest in managing traumatic, toxicological and surgical emergencies.  In his free time, he enjoys golf, scuba diving, watching baseball and working around the house.

  • BrennaDr. Brenna Hosie was born in the suburbs of Chicago but grew up in Augusta Georgia. She attended the University of Georgia where she graduated with a Bachelor of Science in Animal Science. She then went on to complete her Doctorate of Veterinary Medicine at The University of Georgia’s College of Veterinary Medicine (Go Dawgs!). After graduating Dr. Hosie moved to the Washington D.C. area and completed a small animal rotating internship at the Regional Veterinary Referral Center. It was through that program that Dr. Hosie developed a passion for emergency medicine. She has since been working locally in the field of small animal emergency and critical care and is excited for the opportunity to rejoin the RVRC team! When not working Dr. Hosie enjoys spending time with her husband exploring Northern Virginia, playing with their two cats, and chasing their most recent puppy addition, Tuck!

  • Dr Megan Kees comes from Vermont and attended Cedar Crest College in Allentown, PA. She received degrees in Biology and Psychology with a minor in Philosophy. She went on to attend the Univ. of Illinois College of Veterinary Medicine and graduated in 2011. While there she developed a special interest in emergency medicine as well as exotic and wildlife medicine. Upon graduating, she completed a rotating internship in small animal medicine and surgery at RVRC and then went into a three-year residency program at the New England Animal Medical Center in Massachusetts allowing her to specialize in emergency and critical care medicine and surgery. She completed her residency in July 2015 and returned to the RVRC team to practice as a residency trained criticalist. She received her board certification in emergency and critical care in 2018. She has been married to her partner David since 2005 and they have been an integral part of her journey and a source of endless support for her. They share their home with 2 cats, 2 snakes and a Boston terrier named Jill. When not working she enjoys the outdoors, reading, music, and playing video games.

  • Dr. Montine Mansell grew up in Roswell, Georgia. She obtained a Bachelor of Science degree in Zoology followed by her Doctorate of Veterinary Medicine from Auburn University. Since graduating, she completed an Emergency and Critical Care Internship here with us in 2005, and has since worked in both general practice and emergency medicine settings. She is a member of several professional organizations: The American Veterinary Medical Associations, The Northern Virginia AVMA, DC Academy of Veterinary Medicine, and The Veterinary Emergency and Critical Care Society. She is also a volunteer with the Arlington Medical Reserve Corps. Outside of work, Dr. Mansell enjoys vegetable gardening, photography, traveling, playing softball and watching the Auburn Tigers. She lives with her husband, daughter and 2 canine kids: Paisley and Wendy. Dr. Mansell also enjoys fostering for Oldies But Goodies Cocker Rescue.

  • Dr. O’Brien is a native New Yorker. She received her bachelor’s and master’s degrees in music performance from the Juilliard School. She received her VMD from the University of Pennsylvania. She moved to the DC area for an internship at a local referral practice. She was recently profiled in the book Becoming a Veterinarian, published by the Simon and Schuster as part of the masters at work series. Her professional interests include endocrine and cardiovascular emergencies. Her personal interests are tennis; golf; seeing the next great broadway show, and waiting to celebrate the day the Yankees take home World Series #28. Her pets are 2 ShihTzu’s (Elle and Monty), and the ever lovable Sally (who truly is the best dog…but somehow always finds new ways to get herself in trouble!)

  • Dr. Skylar Welti is originally from southeastern Michigan. She attended Grand Valley State University where she graduated with a Bachelor of Science in Biology. She then went on to complete her Doctorate of Veterinary Medicine at The Ohio State University. After graduation, Dr. Welti relocated to the Washington D.C. area and practiced emergency and general small animal medicine at a local hospital. It was then she realized her true passion was emergency medicine and decided to focus her career on this area of medicine. She is excited to continue this work on the RVRC emergency and critical care team. Outside of work, she enjoys spending time with her dog, Griffin, horse-back riding, hiking, reading, and traveling.

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  • We’re open when your family veterinarian’s office is closed… nights, weekends and holidays – 24/7
    Few aspects of pet ownership are more terrifying than when an animal is taken ill in the middle of the night or during weekend hours when your veterinarian’s office is closed. Our Emergency Service exists to care for your pet under just these circumstances, and we’re no farther away than your phone, 24 hours a day. A medical diagnosis takes more than a phone call, but that’s where it usually starts as our well trained and caring staff member answers your questions and directs you on how best to cope with your pet’s problem. We treat a variety of medical and surgical conditions affecting dogs and cats. When you arrive, your pet will be examined and assessed by one of our critical care veterinarians who will explain the treatment options available to you. Please remember that cases are seen on the basis of need, with the most severely affected patients being seen first.

  • Critical Care Medicine Available 24 Hours a Day, Every Day, 365 Days a Year
    Veterinary Emergency and Critical Care Medicine is a veterinary specialty that can save a pet’s life. Should your pet become injured, or suddenly develop an acute, life threatening disease, he or she will require prompt, emergency care. In addition to the initial emergency treatment, in some cases many days may be needed for the disease process to run its course before recovery occurs. During this time, close monitoring and advanced life support measures in the critical care unit (CCU) may be needed. Much of what happens in the critical care setting is initially planned for and started in the emergent phase of the disease. A vigilant team led by a veterinarian who is specially trained in emergency and critical care medicine will improve the quality of care your pet receives during this crucial time, resulting in a greater likelihood that he or she will survive. Critical care clinicians communicate daily with pet owners and involve the referring veterinarian in the ongoing management of their patients.

  • A fully equipped state-of-the-art veterinary hospital…
    By referring you to us, your regular veterinarian is demonstrating his/her trust in our ability to properly care for your pet. We are fully equipped to handle virtually any circumstance that may arise. Our state-of-the-art equipment and treatment regimens are identical to those found in human hospitals. Our superb in-house laboratory can provide fast, accurate, lifesaving diagnoses enabling us to aggressively and effectively treat your pet. In order to be proactive rather than reactive, we have an extensive monitoring network and outstanding professional and support personnel. In those circumstances that demand it, the Emergency and Critical Care Service has ready access to the on-site Board Certified Specialists that comprise the Regional Veterinary Referral Center. When seconds count … we are here for you!

  • As you leave the hospital, you will be given a copy of your pet’s record including all X-rays and results of diagnostic tests. The attending doctor will contact your regular veterinarian upon discharge to notify them of your visit, and we remain available to them even after your pet’s stay with us is completed. We understand that it takes much more than just medical skill to fully care for animals. It takes compassion and dedication – something to remember as you consider the kind of care you want to give your pet. We care about that one special pet – yours!

Our ER and CCU Staff

  • ashley
  • Emergency/Critical Care
  • Emergency/Critical Care
  • Emergency/Critical Care
  • Emergency/Critical Care
  • FReddie
  • jamie
  • kristin
  • melissa
  • michelle
  • Oscar
  • Emergency/Critical Care
  • shaun
  • Sue Mordi


  • Deborah
  • Erika
  • Margaret



Jennifer grew up on the West Coast with various menageries of animals that lead to her wanting to become a veterinary technician. She received her Associates of Applied Science from Bel-Rea Institute of Animal Technology in Denver, Colorado in 1998. You still might catch a glimpse of her on re-runs of the Animal Planet show “Emergency Vets” that was filmed where she did her internship. Out of school, she worked at a small animal and exotic practice in Boulder, Colorado before moving to the east coast in 2000. Shortly thereafter she discovered her love of emergency and critical care, and obtained her Veterinary Technician Specialist in Emergency and Critical Care (VTS-ECC) in 2005. Since then she has managed the staffs of various emergency and critical care departments and briefly dabbled in internal medicine, but she eventually was drawn back to ECC and Regional Veterinary Referral Center in June of 2019.

Jennifer enjoys all sorts of home improvement projects and has traveled all over the world and looks forward to going anywhere she can in the future. She currently shares her life with her husband Manu, daughter Camille, son Tristan, dog Leon (pictured) and her angry cat, Oliver (definitely not pictured!).


Carola is a Northern Virginia native where her love for animals began as a child exploring the great outdoors. This was influenced by her family’s favorite tv series, “Wild America” (starring Marty Stouffer). As a teenager, Carola helped her family raise and rehabilitate wild birds along with caring for their own pets that ranged from exotic to small animals. She attended Christopher Newport University in Southern Virginia graduating with a major in Psychology and minor Communication Studies. She returned to Northern Virginia in 2012, working at Hope Advanced Veterinary Center, in a number of roles including Lead Client Service Representative, Billing Supervisor and Practice Manager. At Regional Veterinary Referral Center, Carola has the honor of heading up an elite team of veterinary professionals as Hospital Manager. Carola stays active by playing co-ed soccer as well as competing in the American Pool Association league of the Greater DC area. At home she has a senior cat named Cougar and two adult cats named Junipurr Penny Pickles and Casper Valentine.

  • Emergency/Critical Care
  • Emergency/Critical Care