Disturbances of the Heart: Discussion of the Treatment of the Heart in Its Various Disorders, With a Chapter on Blood Pressure is a comprehensive medical treatise authored by Oliver T. Osborne, M.D., that delves deeply into the complexities of cardiac health and disease. Drawing on years of clinical experience and contemporary research, Osborne presents a thorough examination of the heart’s anatomy, physiology, and the myriad conditions that can affect its function. The book systematically explores the causes, symptoms, and progression of various heart disorders, including arrhythmias, valvular diseases, myocardial degeneration, and the effects of toxins and infections on cardiac tissue. Osborne emphasizes the importance of accurate diagnosis, detailing the physical signs and diagnostic methods available to physicians of his era. He discusses the role of lifestyle, diet, and emotional factors in the development and management of heart disease, advocating for a holistic approach to patient care. The text provides practical guidance on the use of medications, rest, exercise, and other therapeutic interventions, highlighting both established and emerging treatments. A significant portion of the book is devoted to the management of blood pressure, reflecting the growing recognition of hypertension as a critical factor in cardiovascular health. Osborne explains the mechanisms underlying blood pressure regulation, the dangers of both high and low blood pressure, and the best practices for monitoring and controlling this vital parameter. Throughout, Osborne’s writing is clear, authoritative, and compassionate, making complex medical concepts accessible to both practitioners and lay readers interested in understanding heart health. Disturbances of the Heart stands as a valuable historical resource, offering insight into early 20th-century cardiology and the foundational principles that continue to inform modern medical practice.