Dr. Leng is an anesthesiologist with fellowship training in regional anesthesiology. She treats patients primarily at the Hospital for Veterans Affairs in Palo Alto.

Clinical Focus

  • Anesthesia
  • Regional Anesthesia

Academic Appointments

Honors & Awards

  • Teaching Excellence Award, Presented annually to a faculty member by the graduating resident class (2016)

Boards, Advisory Committees, Professional Organizations

  • Board Certified, American Board of Anesthesiology (2014 - Present)
  • Member, California Society of Anesthesiologists (2014 - Present)
  • Member, American Society of Anesthesiologists (2009 - Present)

Professional Education

  • Board Certification: Anesthesia, American Board of Anesthesiology (2014)
  • Fellowship:Stanford Hospital and ClinicsCA
  • Fellowship:Stanford Medical Center - Anesthesia (2014) CA
  • Residency:Stanford University Hospital - Anesthesia Dept (2013) CA
  • Internship:Jackson Memorial Hosp (2009) FL
  • Medical Education:University of Miami School of Medicine (2008) FL

Research & Scholarship


  • Regional Anesthesia teaching videos (2015 - Present)

    Instructional videos intended for anesthesiologists trained in regional anesthesia, desiring a short tutorial of a particular nerve block. Posted on


    Palo Alto, CA

  • PRIME (Peer support and Resiliency in MEdicine) Facilitator, Stanford Health Care (2016 - Present)

    Faculty facilitator in wellness sessions and annual wellness retreat for anesthesia resident. Training included mindfulness training course.


    Stanford, CA

  • Stanford Anesthesia Resident Maternity Information Sheet, Stanford Health Care (2015 - 2015)

    Developed comprehensive document for residents outlining information about pregnancy and parenting as a resident.


    Stanford, CA


Graduate and Fellowship Programs


All Publications

  • Randomized comparison of popliteal-sciatic perineural catheter tip migration and dislocation in a cadaver model using two catheter designs. Korean journal of anesthesiology Steffel, L., Howard, S. K., Borg, L., Mariano, E. R., Leng, J. C., Kim, T. E. 2017; 70 (1): 72-76


    New catheter-over-needle (CON) technology for continuous peripheral nerve blockade has emerged, but its effect on the risk of perineural catheter tip dislocation is unknown. Less flexible catheters may be more likely to migrate away from the nerve with simulated patient movement. In the present study, we evaluated catheter tip migration between CON catheters and traditional catheter-through-needle (CTN) catheters during ultrasound-guided short-axis in-plane (SAX-IP) insertion.We evaluated the migration of popliteal-sciatic catheters in a prone, unembalmed male cadaver. Thirty catheter placement trials were divided randomly into two groups based on the catheter type: CON or CTN. A single anesthesiology resident placed the catheters by SAX-IP insertion, and the catheters were then examined by ultrasound before and after ipsilateral knee range of motion (ROM) exercises (0°-130° flexion). A blinded expert regional anesthesiologist performed caliper measurements on the ultrasound images before and after the ROM exercises. The primary outcome was the change in distance from the catheter tip to the center of the nerve (cm) between before and after the ROM exercises.The change in the tip-to-nerve distance (median [10th-90th percentile]) was 0.06 (-0.16 to 0.23) cm for the CTN catheter and 0.00 (-0.12 to 0.69) for the CON catheter (P = 0.663). However, there was a statistically significant increase in dislocation out of the nerve compartment for the CON catheter (4/15; 0/15 for CTN) (P = 0.043).Although the use of different catheter designs had no effect on the change in the measured migration distance of popliteal-sciatic catheters, 27% of the CON catheters were dislocated out of the nerve compartment. These results may influence the choice of catheter design when using SAX-IP perineural catheter insertion.

    View details for DOI 10.4097/kjae.2017.70.1.72

    View details for PubMedID 28184270

  • A pilot study to assess adductor canal catheter tip migration in a cadaver model JOURNAL OF ANESTHESIA Leng, J. C., Harrison, T. K., Miller, B., Howard, S. K., Conroy, M., Udani, A., Shum, C., Mariano, E. R. 2015; 29 (2): 308-312


    An adductor canal catheter may facilitate early ambulation after total knee arthroplasty, but there is concern over preoperative placement since intraoperative migration of catheters may occur from surgical manipulation and result in ineffective analgesia. We hypothesized that catheter type and subcutaneous tunneling may influence tip migration for preoperatively inserted adductor canal catheters. In a male unembalmed human cadaver, 20 catheter insertion trials were divided randomly into one of four groups: flexible epidural catheter either tunneled or not tunneled; or rigid stimulating catheter either tunneled or not tunneled. Intraoperative patient manipulation was simulated by five range-of-motion exercises of the knee. Distance and length measurements were performed by a blinded regional anesthesiologist. Changes in catheter tip to nerve distance (p = 0.225) and length of catheter within the adductor canal (p = 0.467) were not different between the four groups. Two of five non-tunneled stimulating catheters (40 %) were dislodged compared to 0/5 in all other groups (p = 0.187). A cadaver model may be useful for assessing migration of regional anesthesia catheters; catheter type and subcutaneous tunneling may not affect migration of adductor canal catheters based on this preliminary study. However, future studies involving a larger sample size, actual patients, and other catheter types are warranted.

    View details for DOI 10.1007/s00540-014-1922-7

    View details for Web of Science ID 000352859100026

    View details for PubMedID 25288506

  • Risk factors for respiratory depression in patients undergoing retrobulbar block for vitreoretinal surgery. Ophthalmic surgery, lasers & imaging retina Silva, R. A., Leng, J. C., He, L., Brock-Utne, J. G., Drover, D. R., Leng, T. 2015; 46 (2): 243-247


    To determine the risk factors for respiratory depression during retrobulbar block administration before vitreoretinal surgery.Prospective, observational case series of 113 patients undergoing monitored anesthesia care and retrobulbar block before vitreoretinal surgery at a tertiary medical center.Chin lift, jaw thrust, and bag mask ventilation were performed in eight (7.1%), nine (8%), and six (5.3%) patients, respectively. No patients required intubation. Age, sex, body mass index, history of obstructive sleep apnea, American Society of Anesthesiologists physical status level, and baseline oxygen saturation were not predictive of airway intervention. Of the four anesthetic agents utilized (midazolam, fentanyl, alfentanil, and propofol), only propofol and fentanyl were associated with an increased risk for clinically significant apnea. Use of three medications for sedation was associated with a 5.4-fold increase in the relative risk of requiring a respiratory rescue intervention.During preoperative sedation for retrobulbar block administration, the use of propofol, fentanyl, or a combination of three anesthetics is associated with a statistically significant increase in the risk for respiratory depression requiring resuscitation. [Ophthalmic Surg Lasers Imaging Retina. 2015;46:243-247.].

    View details for DOI 10.3928/23258160-20150213-22

    View details for PubMedID 25707051

  • Risk Factors for Respiratory Depression in Patients Undergoing Retrobulbar Block for Vitreoretinal Surgery OPHTHALMIC SURGERY LASERS & IMAGING RETINA Silva, R. A., Leng, J. C., He, L., Brock-Utne, J. G., Drover, D. R., Leng, T. 2015; 46 (2): 243-247

    View details for DOI 10.3928/23258160-20150213-22

    View details for Web of Science ID 000353360100013

    View details for PubMedID 25707051

  • An Anesthesia Resident's Prayer. Anesthesiology Leng, J. C. 2013; 119 (2): 483-?

    View details for DOI 10.1097/ALN.0b013e31829b36c2

    View details for PubMedID 23719614