The fonds largely document Dr. Segall's professional activities as a cardiologist. It contains correspondence, notes, experimental notebooks, lecture notes, articles, speeches, patients' records, electrocardiograms, reprints and material pertaining to the Louis Gross Memorial Lectures, 1922-1979. Also included are several electrocardiograph machines, dictation devices, and audio recordings (reel-to-reel tapes, dictation disks, and cassette tapes). In addition, the fonds contain records of Dr. Segall's personal and family correspondence, financial transactions, and various other official and unofficial documents.

This series consists of patient records started and/or consulted between 1939 and 1969, but not consulted after 1969. Each file is stored in a 4x6" envelope. Most of the files contain heart sounds diagrams drawn by Dr. Segall, 6x12'' clinical history forms, sections of electrocardiograms attached to dated cards, as well as 4x6" normal heart sounds record forms completed by Dr. Segall, which are often accompanied by sections of electrocardiogram readings. Many files also contain correspondence between Dr. Segall and other doctors, medical institutions, and health insurance companies, and occasionally correspondence between Dr. Segall and the patient and/or the patient's family.

Sub-series consists of patients records started after 1973, and which were consulted between 1973 and Dr. Segall's retirement.

This series consists of case history files of patients with mitral stenosis. Like most other patient files of the fonds, almost all of these files contain heart sounds diagrams drawn by Dr. Segall, 6x12" clinical history forms, sections of electrocardiograms attached to dated cards, as well as 4x6" normal heart sounds record forms completed by Dr. Segall which are often accompanied by sections of electrocardiogram readings. Many files also contain correspondence between Dr. Segall and other doctors, medical institutions, and health insurance companies, and occasionally correspondence between Dr. Segall and the patient and/or the patient's family.

Consists of the records of deceased patients who were consulted between 1939 and 1969 (files marked with "deceased patient" code B-99). Also contains files concerning meetings in Fredericton in the 1950s, Blue Cross files and medical records concerning Dolly Segall as well as a file relating to Dolly Segall's 70th birthday (Box 320)

This series consists of rolled electrocardiograms taken of various patients.

Series contains case histories of Trans Canada Airlines and Ferry Command pilots. As Dr. Segall explains in "The evolution of the record system" (Box 308), the TCA and ferry command patient records were segregated in order to provide a collection of normal patterns of heart sounds from which he could develop a model pattern for heart sounds. This normal model pattern was then used as the standard against which he could compare the heart sounds of other patients.

This Series consists of ten drawers of a Kardex index, each of which is approximately 52 cm long. The top five drawers consist of indexed conditions, each of which is identified by a two or three character alphanumeric code (either A1 to A45, B1 to B99, or C1 to C70). Attached to each condition in the index is a list of the electrocardiogram numbers of particular patients. Dr. Segall seems to have determined that the listed electrocardiograms represent manifestations of their corresponding Kardex index condition. The individual electrocardiograms are located in Series G and are marked with their electrocardiogram numbers, the date on which they were created, as well as the names of the patients from which they were taken.

Drawers 6 through 10 of the Kardex index (Series M) contain indexed sections for 80 different cardiac symptoms. Each of the 80 symptoms are further divided into 10 (numbered 0 to 9) different sub-sections (possibly for different variations of each symptom), each of which contains a list of the electrocardiogram numbers, often, but not always, including the numbers for electrocardiograms of the patients whose files bear that particular two to three digit numerical code. The listed electrocardiograms seem to have been determined by Dr. Segall to represent manifestations of the corresponding Kardex index symptom.

This series consists of patient records started in 1926 and not consulted after 1939. Most of the files contain heart sounds diagrams drawn by Dr. Segall, 6x12'' clinical history forms, sections of electrocardiograms attached to dated cards, as well as 4x6" normal heart sounds record forms completed by Dr. Segall that are often accompanied by sections of electrocardiogram readings. Many files also contain correspondence between Dr. Segall and other doctors, medical institutions, and health insurance companies, and occasionally correspondence between Dr. Segall and the patient and/or the patient's family.

This series consists of patient records started and/or consulted between 1969 and 1973, but not consulted after 1973. Most of the files contain heart sounds diagrams drawn by Dr. Segall, 6x12" clinical history forms, sections of electrocardiograms attached to dated cards, as well as 4x6" normal heart sounds record forms completed by Dr. Segall, which are often accompanied by sections of electrocardiogram readings. Many files also contain correspondence between Dr. Segall and other doctors, medical institutions, and health insurance companies, and occasionally correspondence between Dr. Segall and the patient and/or the patient's family.