Dan Dyar

I am an experienced cardiac sonographer with an abiding interest in imaging all forms of congenital heart disease, from discovery through palliation/repair. I have a somewhat fanatical obsession with matters of scaling cardiovascular structures— and the application of that theory to reference values for echocardiography.


San Diego State University

Master of Arts (1993): Physical Education
Bachelor of Arts (1988): Physical Education

Grossmont College

Certificate of Achievement (1993): Cardiovascular Technology


Rady Children's Hospital Sr. Sonographer - San Diego, CA - 1998- current

  • Senior sonographer responsible for all line duties/imaging/call
  • Competent in fetal & 3D imaging; trained numerous staff in these modalities
  • Served as PACS Administrator & Developer (KinetDx/Syngo) c. 2006-2015

Loma Linda Univ. Med. Ctr. Lead Sonographer - Loma Linda, CA - 1993-98

  • Lead sonographer responsible for daily operations/oversight of echo lab
  • spearheaded initial application for ICAEL accreditation

ARDMS #034551

Adult Echo (1993), Pediatric Echo (1994), Fetal Echo (2009)

Service To Profession Creator/Curator 2006- present

Conceived, executed, and now maintain a collection of websites dedicated to providing reference values for pediatric echocardiography and numerous other helpful tools. Practical competence in web authoring using html, css, javascript, Python and related stack development tools.

Manuscript Reviewer

Journal of Ultrasound and Medicine: 2016-2017

Berry farming, cattle ranching, surfing.
Available on request

Peer Reviewed

  • Numano F, Shimizu C, Tremoulet AH, Dyar D, Burns JC, Printz BF. Pulmonary Artery Dilation and Right Ventricular Function in Acute Kawasaki Disease. Pediatr Cardiol. 2016 Mar;37(3):482-90. doi: 10.1007/s00246-015-1303-5. Epub 2015 Dec 17. PubMed PMID: 26681305.
  • Davis CK, Dyar DA, Vargas LA, Grossfeld PD. Cardiovascular and Musculoskeletal Assessment of Elite US Volleyball Players. Clin J Sport Med. 2015 Nov;25(6):546-50. doi: 10.1097/JSM.0000000000000178. PubMed PMID: 25756701.
  • Bratincsak A, Reddy VD, Purohit PJ, Tremoulet AH, Molkara DP, Frazer JR, Dyar D, Bush RA, Sim JY, Sang N, Burns JC, Melish MA. Coronary artery dilation in acute Kawasaki disease and acute illnesses associated with Fever. Pediatr Infect Dis J. 2012 Sep;31(9):924-6. doi: 10.1097/INF.0b013e31826252b3. PubMed PMID: 22673140.
  • Dyar DA, Fripp RR, Printz BF. Normal values for left ventricular volume in infants and young children: questions for the authors. J Am Soc Echocardiogr. 2011 Aug;24(8):933; author reply 933-4. doi: 10.1016/j.echo.2011.05.007. Epub 2011 Jun 12. PubMed PMID: 21664799.
  • Mathewson JW, Dyar D, Jones FD, Sklansky MS, Perry JC, Michelfelder EC, Cripe L, Kimball TR. Conversion to digital technology improves efficiency in the pediatric echocardiography laboratory. J Am Soc Echocardiogr. 2002 Dec;15(12):1515-22. PubMed PMID: 12464921.
  • Brown VE, De Lange M, Dyar DA, Impastato LW, Shirali GS. Echocardiographic spectrum of supracardiac total anomalous pulmonary venous connection. J Am Soc Echocardiogr. 1998 Mar;11(3):289-93. PubMed PMID: 9560753.
  • Shirali GS, Lombano F, Beeson WL, Dyar DA, Mulla NF, Khan A, Johnston JK, Chinnock RE, Gundry SR, Razzouk AJ, et al. Ventricular remodeling following infant-pediatric cardiac transplantation. Does age at transplantation or size disparity matter? Transplantation. 1995 Dec 27;60(12):1467-72. PubMed PMID: 8545876.


  • Transthoracic Echocardiographic Evaluation of Atrial Septal Defects
    Dan A Dyar, Lisa A Vargas, Alok Bose
    Pediatric Ultrasound Today, 2004
  • Congenital Heart Disease Visualized: Echocardiography with Pathology Correlation
    Shirali GS, Lombano F, Dyar D, Larsen RL, Kearney DL, Bricker JT
    Armonk, NY: Futura Publishing Company, 1997