Fluids and Electrolytes There is no doubt, fluid maintenance remains one of the main foundations of medicine. Fluids are deemed as being the most essential substance of life. Around 60% of our body is made up of water, and this serves as a medium for transport of both nutrients and waste products. The electrolytes contained within the body water are responsible for the body's most basic functions, such as nerve function, and functioning of voluntary and involuntary muscles, activating enzymes, and release of hormones. Maintenance of these components in a constant balance is essential, because the entire metabolic process of the body depends on these components. Fluids and electrolytes are not static, but interact continuously with each other, and with other components of the body. It is essential to understand these interactions, and the role they play in maintenance of health. Imbalances in these substances within the body are responsible for some of the most significant medical conditions and disorders. Any patient, who has presented with a fairly serious medical illness, is bound to have some kind of imbalance in the fluid-electrolyte levels. All patients in intensive care units are routinely screened for such imbalances. Thus, it is apparent that a medical professional needs to have a firm grasp of the fundamentals of electrolytes, fluids and acid-base balance in the body, so that effective treatment can be carried out. This subject is often confusing for both the beginner medical student and the day to day medical practitioner. However, once the underlying basic concepts of fluids and electrolytes are grasped, it becomes easy to recognize imbalances in these systems, and it follows that treatment becomes easier and more planned. In this book, we will discuss the regulation of fluids, electrolytes, and the acid-base system, and how these factors are interconnected. When there is an imbalance in one of these electrolytes, the others are usually affected. Similarly, electrolyte imbalances can arise from, or be a result of, acid-base disorders. We will also discuss the signs and symptoms of various imbalances, and touch upon the management modalities for these imbalances. Common medical conditions where there are massive imbalances are described in the last chapter. There are summaries at the end of each chapter, that help you quickly glance through essential information. Lastly, this book tests what you have learned with post chapter tests.