Thomas M. Krummel

Stanford University, Palo Alto, California, United States

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Publications (178)498.42 Total impact

  • Source
    Matthew B Bloom · Chantal L Rawn · Arnold D Salzberg · Thomas M Krummel ·

  • Thomas M. Krummel ·

    Journal of Pediatric Surgery 01/2015; 50(1). DOI:10.1016/j.jpedsurg.2014.10.026 · 1.39 Impact Factor
  • Thomas M Krummel ·

    Annals of Surgery 08/2014; 260(2):212-3. DOI:10.1097/SLA.0000000000000804 · 8.33 Impact Factor
  • Michael L Nance · Keith T Oldham · Thomas M Krummel ·

    PEDIATRICS 02/2014; 133(3). DOI:10.1542/peds.2013-2148 · 5.47 Impact Factor
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    Michael L Nance · Thomas M Krummel · Keith T Oldham ·

    Journal of the American College of Surgeons 09/2013; 217(5). DOI:10.1016/j.jamcollsurg.2013.07.381 · 5.12 Impact Factor
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    ABSTRACT: The Stanford Biodesign Program began in 2001 with a mission of helping to train leaders in biomedical technology innovation. A key feature of the program is a full-time postgraduate fellowship where multidisciplinary teams undergo a process of sourcing clinical needs, inventing solutions and planning for implementation of a business strategy. The program places a priority on needs identification, a formal process of selecting, researching and characterizing needs before beginning the process of inventing. Fellows and students from the program have gone on to careers that emphasize technology innovation across industry and academia. Biodesign trainees have started 26 companies within the program that have raised over $200 million and led to the creation of over 500 new jobs. More importantly, although most of these technologies are still at a very early stage, several projects have received regulatory approval and so far more than 150,000 patients have been treated by technologies invented by our trainees. This paper reviews the initial outcomes of the program and discusses lessons learned and future directions in terms of training priorities.
    Annals of Biomedical Engineering 02/2013; 41(9). DOI:10.1007/s10439-013-0761-2 · 3.23 Impact Factor
  • Timothy A Plerhoples · Ralph S Greco · Thomas M Krummel · Marc L Melcher ·
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    ABSTRACT: OBJECTIVE:: We conducted a systematic review of published literature to gain a better understanding of the impact of advanced fellowships on surgical resident training and education. BACKGROUND:: As fellowship opportunities rise, resident training may be adversely impacted. METHODS:: PubMed, MEDLINE, Scopus, BIOSIS, Web of Science, and a manual search of article bibliographies. Of the 139 citations identified through the initial electronic search and screened for possible inclusion, 23 articles were retained and accepted for this review. Data were extracted regarding surgical specialty, methodology, sample population, outcomes measured, and results. RESULTS:: Eight studies retrospectively compared the eras before and after the introduction of a fellowship or trended data over time. Approximately half used data from a single institution, whereas the other half used some form of national data or survey. Only 3 studies used national case data. Fourteen studies looked at general surgery, 6 at obstetrics-gynecology, 2 at urology, and 1 at otolaryngology. Only one study concluded that fellowships have a generally positive impact on resident education, whereas 9 others found a negative impact. The remaining 13 studies found mixed results (n = 6) or minimal to no impact (n = 7). CONCLUSIONS:: The overall impact of advanced surgical fellowships on surgical resident education and training remains unclear, as most studies rely on limited data of questionable generalizability. A careful study of the national database of surgery resident case logs is essential to better understand how early surgical specialization and fellowships will impact the future of general surgery education.
    Annals of surgery 09/2012; 256(6). DOI:10.1097/SLA.0b013e318262edd5 · 8.33 Impact Factor
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    Jason T. Lee · Amy Peruzzaro · Thomas Krummel · Ronald L. Dalman ·

    Journal of Vascular Surgery 06/2012; 55(6):27S. DOI:10.1016/j.jvs.2012.03.090 · 3.02 Impact Factor
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    ABSTRACT: To determine the feasibility and efficacy of applying an established innovation process to an active academic interventional radiology (IR) practice. The Stanford Biodesign Medical Technology Innovation Process was used as the innovation template. Over a 4-month period, seven IR faculty and four IR fellow physicians recorded observations. These observations were converted into need statements. One particular need relating to gastrostomy tubes was diligently screened and was the subject of a single formal brainstorming session. Investigators collected 82 observations, 34 by faculty and 48 by fellows. The categories that generated the most observations were enteral feeding (n = 9, 11%), biopsy (n = 8, 10%), chest tubes (n = 6, 7%), chemoembolization and radioembolization (n = 6, 7%), and biliary interventions (n = 5, 6%). The output from the screening on the gastrostomy tube need was a specification sheet that served as a guidance document for the subsequent brainstorming session. The brainstorming session produced 10 concepts under three separate categories. This formalized innovation process generated numerous observations and ultimately 10 concepts to potentially to solve a significant clinical need, suggesting that a structured process can help guide an IR practice interested in medical innovation.
    Journal of vascular and interventional radiology: JVIR 04/2012; 23(4):488-94. DOI:10.1016/j.jvir.2011.12.029 · 2.41 Impact Factor
  • Homero Rivas · John M Morton · Thomas M Krummel ·

    New England Journal of Medicine 08/2010; 363(9):888-9; author reply 890-1. DOI:10.1056/NEJMc1005803 · 55.87 Impact Factor
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    Norman M Rich · Thomas M Krummel · David G Burris ·

    Journal of vascular surgery: official publication, the Society for Vascular Surgery [and] International Society for Cardiovascular Surgery, North American Chapter 08/2010; 52(2):508-11. DOI:10.1016/j.jvs.2010.01.093 · 3.02 Impact Factor
  • Kevin Z Chao · Daniel J Riskin · Thomas M Krummel ·

    The virtual mentor : VM 01/2010; 12(2):91-95. DOI:10.1001/virtualmentor.2010.12.2.medu1-1002
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    ABSTRACT: Accurate assessment of resident competency is a fundamental requisite to assure the training of physicians is adequate. In surgical disciplines, structured tests as well as ongoing evaluation by faculty are used for evaluating resident competency. Although structured tests evaluate content knowledge, faculty ratings are a better measure of how that knowledge is applied to real-world problems. In this study, we sought to explore the performance of surgical residents in a simulation exercise (strategic management simulations [SMS]) as an objective surrogate of real-world performance. Forty surgical residents participated in the SMS simulation that entailed decision making in a real-world-oriented task situation. The task requirements enable the assessment of decision making along several parameters of thinking under both crisis and noncrisis situations. Performance attributes include "simpler" measures of competency (activity level), intermediate categories (information management and emergency responses) to complex measures (breadth of approach and strategy). Scores obtained in the SMS were compared with the scores obtained on the American Board of Surgery In-Training Examination (ABSITE). The data were intercorrelated and subjected to a multiple regression analysis with ABSITE as the dependent variable and simulation scores as independent variables. Using a 1-tail test analysis, only 3 simulation variables correlated with performance on ABSITE at the .01 level (ie, basic activity, focused activity, task orientation). Other simulation variables showed no meaningful relationships to ABSITE scores at all. The more complex real-world-oriented decision-making parameters on SMS did not correlate with ABSITE scores. We believe that techniques such as the SMS, which focus on critical thinking, complement assessment of medical knowledge using ABSITE. The SMS technique provides an accurate measure of real-world performance and provides objective validation of faculty ratings.
    12/2009; 1(2):273-7. DOI:10.4300/JGME-D-09-00034.1
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    Pankaj Jay Pasricha · Thomas M Krummel ·
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    ABSTRACT: In this inaugural year of a historic presidency, gastroenterologists and gastrointestinal surgeons may well want to turn their attention to more immediate transformative events that have the potential to revolutionize their own practice in the near future. The most visible and, perhaps, controversial of these is natural orifice transluminal endoscopic surgery (NOTES), but other equally important changes are emerging as investigators around the globe vie with one another in the demonstration of increasingly audacious procedures. As is to be expected, we are also already seeing a backlash from more conservative scholars attempting to temper what they believe to be the surgical equivalent of irrational exuberance. However, by far the most common attitude among gastroenterologists toward these changes is one of indifference. In this piece, we discuss the circumstances that led to the development of NOTES and other innovative procedures, the peril that lies in ignoring them, and the true promise that they hold for our specialties.
    The American Journal of Gastroenterology 10/2009; 104(10):2384-6. DOI:10.1038/ajg.2009.150 · 10.76 Impact Factor
  • Thomas M Krummel ·

    Journal of Pediatric Surgery 02/2009; 44(1):21-35. DOI:10.1016/j.jpedsurg.2008.10.005 · 1.39 Impact Factor

  • Journal of the American College of Surgeons 07/2008; 206(3):1204-9. DOI:10.1016/j.jamcollsurg.2008.02.011 · 5.12 Impact Factor
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    ABSTRACT: Simulator-based endovascular skills training measurably improves performance in catheter-based image-guided interventions. The purpose of this study was to determine whether structured global performance assessment during endovascular simulation correlated well with trainee-reported procedural skill and prior experience level. Fourth-year and fifth-year general surgery residents interviewing for vascular fellowship training provided detailed information regarding prior open vascular and endovascular operative experience. The pretest questionnaire responses were used to separate subjects into low (<20 cases) and moderate (20 to 100) endovascular experience groups. Subjects were then asked to perform a renal angioplasty/stent procedure on the Procedicus Vascular Intervention System Trainer (VIST) endovascular simulator (Mentice Corporation, Gothenburg, Sweden). The subjects' performance was supervised and evaluated by a blinded expert interventionalist using a structured global assessment scale based on angiography setup, target vessel catheterization, and the interventional procedure. Objective measures determined by the simulator were also collected for each subject. A postsimulation questionnaire was administered to determine the subjects' self-assessment of their performance. Seventeen surgical residents from 15 training programs completed questionnaires before and after the exercise and performed a renal angioplasty/stent procedure on the endovascular simulator. The beginner group (n = 8) reported prior experience of a median of eight endovascular cases (interquartile range [IQR], 6.5-17.8; range, 4-20), and intermediate group (n = 9) had previously completed a median of 42 cases (IQR, 31-44; range, 25-89, P = .01). The two groups had similar prior open vascular experience (79 cases vs 75, P = .60). The mean score on the structured global assessment scale for the low experience group was 2.68 of 5.0 possible compared with 3.60 for the intermediate group (P = .03). Scores for subcategories of the global assessment score for target vessel catheterization (P = .02) and the interventional procedure (P = .05) contributed more to the differentiation between the two experience groups. Total procedure time, fluoroscopy time, average contrast used, percentage of lesion covered by the stent, placement accuracy, residual stenosis rates, and number of cine loops utilized were similar between the two groups (P > .05). Structured endovascular skills assessment correlates well with prior procedural experience within a high-fidelity simulation environment. In addition to improving endovascular training, simulators may prove useful in determining procedural competency and credentialing standards for endovascular surgeons.
    Journal of Vascular Surgery 05/2008; 47(5):1008-1; discussion 1014. DOI:10.1016/j.jvs.2008.01.007 · 3.02 Impact Factor
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    ABSTRACT: : Training surgical residents to manage critically injured patients in a timely fashion presents a significant challenge. Simulation may have a role in this educational process, but only if it can be demonstrated that skills learned in a simulated environment translate into enhanced performance in real-life trauma situations. : A five-part, scenario-based trauma curriculum was developed specifically for this study. Midlevel surgical residents were randomized to receiving this curriculum in didactic lecture (LEC) fashion or with the use of a human performance simulator (HPS). A written learning objectives test was administered at the completion of the training. The first four major trauma resuscitations performed by each participating resident were captured on videotape in the emergency department and graded by two experienced judges blinded to the method of training. The assessment tool used by the judges included an evaluation of both initial trauma evaluation or treatment skills (part I) and crisis management skills (part II) as well as an overall score (poor/fail, adequate, or excellent). : The two groups of residents received almost identical scores on the posttraining written test. Average SIM and LEC scores for part I were also similar between the two groups. However, SIM-trained residents received higher overall scores and higher scores for part II crisis management skills compared with the LEC group, which was most evident in the scores received for the teamwork category (p = 0.04). : A trauma curriculum incorporating simulation shows promise in developing crisis management skills that are essential for evaluation of critically injured patients.
    The Journal of trauma 03/2008; 64(2):255-63; discussion 263-4. DOI:10.1097/TA.0b013e31816275b0 · 2.96 Impact Factor

  • Surgery 03/2008; 143(2):183-91. DOI:10.1016/j.surg.2007.11.011 · 3.38 Impact Factor
  • Jonathan Riboh · Myriam Curet · Thomas Krummel ·
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    ABSTRACT: Lack of exposure to surgery in the preclinical years of medical school contributes to students' negative opinions of the field and to low application rates to categorical surgical programs. Forty preclinical medical students attended a series of 16 seminars and practice sessions covering the gamut of surgical specialties and basic technical skills. Students were given a Likert format survey before and after taking the course. Students gave high ratings to course content (4.26/5) and lecturers (4.54/5). Students' confidence in their surgical skills doubled (1.45/5 to 3/5, P < .0001), and their perceived readiness for the surgical clerkship increased by 73% (1.63/5 to 2.82/5, P = .007). The preclinical years offer a promising venue for improving medical student interest and performance in surgery.
    American journal of surgery 09/2007; 194(2):227-30. DOI:10.1016/j.amjsurg.2006.12.038 · 2.29 Impact Factor

Publication Stats

5k Citations
498.42 Total Impact Points


  • 2000-2015
    • Stanford University
      • Department of Surgery
      Palo Alto, California, United States
    • Texas Tech University
      • Department of Computer Science
      Lubbock, TX, United States
  • 2006
    • University of California, Los Angeles
      • Department of Surgery
      Los Angeles, CA, United States
    • Lucile Packard Children’s Hospital at Stanford
      Palo Alto, California, United States
  • 1999-2006
    • Stanford Medicine
      • • Department of Surgery
      • • Division of Pediatric Cardiac Surgery
      • • Stanford Genome Technology Center
      Stanford, California, United States
  • 2002
    • VA Palo Alto Health Care System
      Palo Alto, California, United States
  • 1999-2000
    • Geisinger Health System
      Danville, Pennsylvania, United States
  • 1994-2000
    • Penn State Hershey Medical Center and Penn State College of Medicine
      • Department of Surgery
      Hershey, PA, United States
  • 1992-1999
    • Pennsylvania State University
      • Department of Surgery
      University Park, Maryland, United States
  • 1983-1997
    • Virginia Commonwealth University
      • • Department of Surgery
      • • Department of Pediatrics
      • • Department of Radiology
      Richmond, Virginia, United States