- ABOUT ME
- AREAS OF FOCUS
- EDUCATION & LEADERSHIP
- LOCATIONS & HOSPITALS
- NEWS & PUBLICATIONS
Dr. Cassandra Mullen knows that sleeping is one of the often-underappreciated pillars of health. By sleeping well, we can delay and prevent diseases from developing while also feeling better in the moment. She finds it very satisfying to help patients feel better and live longer. Dr. Mullen loves working with patients over the course of years, seeing their symptoms improve and hearing about how treatment has impacted their quality of life.
Dr. Mullen completed her training in sleep medicine at Yale, learning alongside leading experts in the field. She joins each appointment with curiosity and empathy and takes an individualized approach to patient treatment since no two people are the same.
When not working, Dr. Mullen can be found playing soccer or basketball, hiking, biking, kiteboarding in Hood River, reading a book with her cats, and spending time with loved ones. She loves how bikeable the area is, how much nature surrounds us, and the amazing food in the region.
Volunteer Activities
Special Olympics Coach
Other Activities
Member, American Academy of Sleep Medicine
Member, American College of Physicians
Areas of Focus
Obstructive Sleep Apnea
Central Sleep Apnea
Restless Leg Syndrome
Insomnia
Narcolepsy
Idiopathic Hypersomnia
Circadian Rhythm Disorders
Sleep Impact on Athletic Performance
EDUCATION & TRAINING
Fellowship, Sleep Medicine, Yale, 2025
Medical Officer, Department of Hospital Medicine, Clutha Health First, New Zealand, 2023
Residency, Internal Medicine, Department of Medicine, Oregon Health & Science University, 2022
MD, Georgetown University School of Medicine, 2018
BA, Cum Laude, Mathematics and Statistics, Carleton College, 2013
BOARD CERTIFICATION
Sleep Medicine
Internal Medicine
HONORS
Clinic Excellence in Education Award, OHSU General Internal Medicine, 2021
Stack Humanism Award, OHSU Department of Medicine, 2020
Clinical Excellence Award, OHSU, 2020
Second place in poster presentation for “Flipping the Script on Syncope,” American College of Physicians Oregon Chapter, 2020
Clinical Excellence Award, OHSU, 2019
Poster presentation finalist for “Neutrophilic Dermatosis, Not As Sweet As It Sounds,” American College of Physicians Oregon Chapter, 2019
Locations
Hospitals Served
- Providence Portland Medical Center
- Providence St. Vincent Medical Center
- Providence Milwaukie Hospital
- Providence Willamette Falls Medical Center
- Providence Newberg Medical Center
Publications
Mullen, Cassandra, Weiss. “Transitional Care for Patients with Congenital Heart Disease.” Principles and Practice of Sleep Medicine, edited by Meir H. Kryger, Thomas Roth, and Cathy A. Goldstein, 8th ed., Elsevier, 2025, Chapter 195 pp. pending.
Mullen C, and Tobias L. Sleep and athletic performance. CHEST Physician “Network News” Dec 2024.
Christine Rutlen, Cassie Mullen, Francis Phan, Merritt Raitt, Khidir Dalouk, Ignatius Zarraga, David Shim, Peter M. Jessel. Paroxysmal atrial fibrillation history is associated with earlier recurrence after first cardioversion compared with primary persistent atrial fibrillation. Heart Rhythm. 2024 Jul 18:S1547-5271(24)02913-8. doi: 10.1016/j.hrthm.2024.07.030.
Mullen, Cassandra, Jacobs, Zachary, Pettersson, David, Hunter, Alan. Turning the World Upside Down: Reversal-of-Vision Metamorphopsia in a Patient with Syncope. BMJ Case Reports. 2023;16e255453. Doi:10.1136/bcr-2023-255453.
Rutlen, Christine, Mullen, Cassie, Phan, Francis, Raitt, Merritt, Dalouk, Khidir, Zarraga, Ignatius, MacMurdy, Karen, Jessel, Peter. History of Paroxysmal Atrial Fibrillation is Associated with earlier Recurrence after initial Cardioversion Compared to New-Onset Persistent Atrial Fibrillation. Circulation. 2021;144: A11863.