The Dr. W.G. Bigelow fonds consists of 21 series of textual records documenting the life and work of the pioneering Canadian heart surgeon, medical researcher, and co-developer of the cardiac pacemaker, Dr. Wilfred G. Bigelow:

0094-1 Appointment books
0094-2 Medical textbooks
0094-3 Case histories
0094-4 Medical conference programs
0094-5 Patient/surgery lists
0094-6 General patient files
0094-7 Correspondence
0094-8 Experimental and clinical research files
0094-9 Lectures and speeches
0094-10 Diagnoses and procedures
0094-11 Medical research grants-in-aid
0094-12 Professional Societies, Associations and Committees
0094-13 Toronto General Hospital files
0094-14 Medical insurance accounts
0094-15 University of Toronto files
0094-16 Medical journal publications
0094-17 Meetings
0094-18 Japanese publications on hypothermia research
0094-19 Travel files
0094-20 Medical office expenses
0094-21 Income tax returns

Collectively, the materials comprising this fonds illustrate virtually every aspect of Dr. Bigelow's personal and professional life as a surgeon and hospital division head, academic instructor and researcher, clinical investigator, author, lecturer, medical conference presenter and panellist, and member of numerous medical societies and medical/scientific committees.

In particular the fonds provides information about Dr. Bigelow's contributions to the advancement of cardiac surgery and the treatment of heart disease, especially his central accomplishments in contributing to the innovation and development of the surgical use of hypothermia in open-heart surgery and the electrical artificial cardiac pacemaker.