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Outpatient Anesthesia Services is committed to your safety, health and comfort while in our care. Our goal is to provide you, the patient, an outstanding anesthesia experience. Over the past 21 years, we have developed a team of highly qualified and competent anesthesia providers who share both our vision in quality of care and patient satisfaction. To support this vision, OAS has created patient information materials such as this website to help educate you and answer any questions you may have about your upcoming anesthesia. We believe that good communication will help alleviate some of the anxieties you may be feeling about your health and safety during your procedure. We would also like to invite you to call us if you have any additional questions at 503-548-4770. We would be happy to connect you with one of our anesthesia providers directly.

Grant Diggles, CEO | Outpatient Anesthesia Services


Still have questions?

What Is Anesthesia?

Outpatient Anesthesia Services
Anesthesia is a vital part of surgical practice, allowing surgeons to operate safely on patients by producing the loss of sensation and/or consciousness through the use of medications and close monitoring. Anesthesia provides comfort and maintains vital life functions during surgery and other medical procedures. Anesthesia is used to relax (sedate) you, block pain sensations (analgesia), induce sleepiness and forgetfulness (amnesia) or to make you unconscious for your surgery. The anesthetic option chosen for your individual procedure will be based on the type of procedure you are having, your physical status and in collaboration with your surgeon.

How does anesthesia work?

Anesthesia can be administered as an inhaled gas delivered through the lungs or in the form of medication injected into the bloodstream. Anesthetics can act on receptors in the brain to produce pain relief and unconsciousness, or on the nervous system to produce pain relief and numbing of nerve pathways. When anesthetics reach the bloodstream, the drugs that affect the brain pass through other blood vessels and organs so they are often affected too. Your anesthesia provider continuously monitors your vital functions such as heart rate, heart rhythm, blood pressure, respiration and oxygen saturation to ensure maximum safety and comfort.

Preparing For Surgery

A vital part of providing you a safe anesthetic is how you prepare for your procedure the day before. We’ve provided this short list of information to help cover the basics of what you can expect. One of our anesthesia providers will be contacting you prior to your surgical date to cover your health history and address any questions or concerns you may have. If your concerns are pressing, please don’t hesitate to contact our office at: 503-548-4770 and we’d be happy to put you in touch with one of our clinicians quickly.


  1. DO NOT EAT ANYTHING 8 HOURS PRIOR to your surgery.
  2. YOU MAY DRINK CLEAR LIQUIDS UP TO 2 HOURS PRIOR to your surgery admission time. This is very important! If you forget and do ingest something, your surgery may be cancelled, postponed or rescheduled.
  3. Please take routine morning medicines with a small sip of water. DIABETICS, please consult with your anesthesia provider prior to your date of surgery.
  4. Refrain from chewing gum or chewing tobacco the morning of surgery. If you are a smoker, do not indulge that morning.
  5. Contact lenses may be left in, but please inform your provider of their presence.

Outpatient Anesthesia Services - Grant Diggles, CEO"We've carefully crafted our mission, vision and values to accurately reflect the culture of who we are. We believe this effort will provide an anesthesia experience that is well rounded on both a clinical and relational level, serving both our patients and our clients with the highest standards of care, compassion and service. It is my commitment that your interactions with our providers are consistent with those values, no matter who you work with."

Grant Diggles, CEO | Outpatient Anesthesia Services


333 S State st.
Suite V-111
Lake oswego, or 97034


P: 503-548-4770
F: 503-655-3318


P: 517-787-6440 ext 4332