The field of cardiovascular research and monitoring faces a critical challenge in the early detection of cardiovascular diseases due to limitations in existing monitoring methods. These methods lack accuracy, power efficiency, and compactness, creating a gap in effective intervention and patient outcomes. This pressing problem necessitates advanced solutions that can enhance the capabilities of wearable and implantable electrocardiography (ECG) sensors for accurate and timely detection of conditions like cardiac arrhythmia and heart failure. Wearable and Implantable Electrocardiography for Early Detection of Cardiovascular Diseases presents a comprehensive solution to address these challenges. Written by esteemed scholars with experience in academia and research, this groundbreaking book introduces innovative approaches to enhance ECG sensors. It introduces a novel low-noise and low-power capacitive feedback amplifier based on a current-reused operational transconductance amplifier (OTA). By incorporating digitalization techniques and threshold converters, the proposed architecture enables the accurate extraction of vital data points. The emphasis on reduced power consumption and circuit size ensures energy-efficient and compact monitoring solutions. This essential resource targets academic scholars, researchers, and professionals in the field of cardiovascular research and monitoring. Covering a wide range of topics, including cardiovascular monitoring and detection, ECG sensors, operational transconductance amplifiers, experimental design, VLSI circuits, and FPGA design, the book caters to diverse interests and needs. With the help of the editors' expertise in teaching and research, readers gain valuable insights and innovative solutions to overcome existing limitations. By utilizing the knowledge and tools shared in this book, scholars and professionals can drive advancements in the early detection and management of cardiovascular diseases, improving patient care and outcomes. Wearable and Implantable Electrocardiography for Early Detection of Cardiovascular Diseases addresses the critical challenge of early detection in cardiovascular research and monitoring. Through its advanced approaches and emphasis on efficiency, the book offers a comprehensive solution for enhancing ECG sensors. With its relevance to academia and research, it equips readers with the necessary knowledge and tools to make significant contributions to the field of cardiovascular healthcare, benefiting patients and advancing the field.