Chapter 20: Heart and Neck Vessels

Heart and Neck Vessels begins by situating the heart within the mediastinum and detailing its internal architecture, including the four chambers, specialized valves designed to maintain unidirectional flow, and the multi-layered heart wall consisting of the pericardium, myocardium, and endocardium. The narrative explains the cardiac cycle through the shifting pressure gradients of systole and diastole, which generate the characteristic first and second heart sounds, while also exploring the clinical significance of extra sounds like gallops and murmurs. Essential hemodynamic concepts such as cardiac output, preload, and afterload are defined alongside the heart’s electrical conduction pathway, from the sinoatrial node to the ventricles, as visualized on an electrocardiogram. In addition to the precordium, the chapter emphasizes the evaluation of neck vessels, detailing how carotid waveforms and jugular venous pulsations serve as critical windows into central venous pressure and overall cardiac efficiency. Life-cycle variations are thoroughly addressed, covering fetal circulatory shunts like the foramen ovale, the increased metabolic demands of pregnancy, and the age-related arterial stiffening observed in geriatric populations. A significant portion of the text is dedicated to health promotion and the identification of cardiovascular risk factors, with particular attention to social determinants affecting hypertension prevalence and the unique symptomatic presentations of myocardial infarction in women. Finally, the chapter provides a systematic guide to the physical examination, outlining subjective history-taking for symptoms like angina or dyspnea and the objective techniques of inspection, palpation, and auscultation required to detect abnormalities such as bruits, thrills, and various congenital or acquired valvular defects.