This chapter presents the anatomy review of the human heart. The human heart is a hollow four-chambered muscle that is responsible for pumping blood throughout the body. The heart lies in the mediastinum in the thorax, pointing toward the left of the midline. The heart consists of four main layers: the pericardium, epicardium, myocardium, and endocardium. The epicardium is the outermost layer of the heart muscle. The middle layer of the heart is called the myocardium. The innermost layer of the heart is the endocardium. The heart is divided into right and the left side. The right side of the heart contains the right atrium and right ventricle. The left side of the heart contains the left atrium and left ventricle. The heart has four valves: tricuspid valve, mitral valve, aortic valve, pulmonary valve; acting as tiny doors that keep the blood moving in one direction.
Your search for all content returned 2,928 results
The chapter explores how to measure the electrical direction for the P wave, the QRS complex, and the T wave, as well as for other forces. It provides a method for determining the direction of the electrical force for any of these waves, or complexes, on the electrocardiograph (EKG). The heart produces electrical and mechanical energy on a continuous basis. Both forms of energy come from specialized cardiac muscle fibers. These fibers provide electrical signals and mechanical energy that physically pumps the blood. Although the EKG does not show that mechanical energy, it can be used to measure a variety of electrical events. When a force is abnormal in size or direction, it may indicate that the specific part of the heart producing the force is abnormal. Therefore, learning the normal electrical direction of forces in the heart provides a simple and scientific way of understanding and interpreting an EKG.
This chapter explains various types of heart blocks such as premature atrial contraction, sinus arrest and asystole. It explains various types of pacemakers such as ventricular pacemaker and artrial pacemakers. Junctional rhythm is a regular rhythm. A P wave is frequently not seen because the rhythm originates in the AV junctional node. Junctional rhythm may be a manifestation of digitalis toxicity, sick sinus syndrome, and acute inferior wall infarction. Pauses are most commonly caused by premature atrial contractions (PACs) that do not conduct down to the ventricle and generate a QRS complex. These are called nonconducted PACs (NCPACs). Asystole is a prolonged period of no electrical activity. Cessation of function of the sinus node is called sinus arrest. Normally, when sinus arrest occurs, another pacemaker must take over, such as the junction or the ventricles. Ventricular pacemaker rhythm demonstrates a vertical electrical artifact (EA) at the beginning of the QRS.
This chapter presents the case examples of pressure and volume overload on the left ventricle and provides list of criteria for the diagnosis of Left Ventricular Hypertrophy (LVH) on the electrocardiogram (EKG). It also describes and explains how to identify ST changes in LVH and LVH simulating anterior wall infarction on the EKG. LVH refers to an increase in the wall thickness or dilation of the left ventricle. LVH is often the result of increased pressure, or volume, within the left ventricular chamber. Mitral regurgitation (MR) occurs when the mitral valve allows the backflow of blood from the left ventricle into the left atrium. The most common cause of pressure overload is hypertension (HTN). Hypertrophy of the left ventricle increases the amplitude of the left ventricular forces, because more mass generates more electricity. In LVH, the frontal plane, the horizontal plane, or both may show increased QRS amplitude.
- Go to chapter: Social Work and the Law: An Overview of Ethics, Social Work, and Civil and Criminal Law
This chapter demonstrates how social work ethics apply to ethical and legal decision making in forensic social work practice. It discusses the context of social work practice in legal systems. The chapter also details the basic structures of the United States (U.S.) civil and criminal legal systems. It lays the foundation for the criminal and civil court processes in the United States and introduces basic terminology and a description of associated activities and progression through these systems. The chapter focuses on providing an introductory, and overarching, picture of both civil and criminal law in the U.S. and introduces the roles social workers play in these systems. It focuses on the ETHICA model of ethical decision making as a resource and tool that can be used to help forensic social workers process difficult and complex situations across multiple systems.
This chapter explains the theoretical basis for motivational interviewing (MI). It reviews the empirical evidence for the use of MI with diverse populations in forensic settings. MI involves attention to the language of change, and is designed to strengthen personal motivation and commitment to a specific goal by eliciting and exploring the person’s own reasons for change within an atmosphere of acceptance and compassion. It is now internationally recognized as an evidence-based practice intervention for alcohol and drug problems. MI involves an underlying spirit made up of partnership, acceptance, compassion, and evocation. The chapter discusses four key processes involved in MI: engaging, focusing, evoking, and planning. It also describes five key communication microskills used throughout MI: asking open-ended questions, providing affirmations, offering summarizing statements, providing information and advice with permission, and reflective statements.
This chapter presents an overview of the restorative justice movement in the twenty-first century. Restorative justice, on the other hand, offers a very different way of understanding and responding to crime. Instead of viewing the state as the primary victim of criminal acts and placing victims, offenders, and the community in passive roles, restorative justice recognizes crime as being directed against individual people. The values of restorative justice are also deeply rooted in the ancient principles of Judeo-Christian culture. A small and scattered group of community activists, justice system personnel, and a few scholars began to advocate, often independently of each other, for the implementation of restorative justice principles and a practice called victim-offender reconciliation (VORP) during the mid to late 1970s. Some proponents are hopeful that a restorative justice framework can be used to foster systemic change. Facilitation of restorative justice dialogues rests on the use of humanistic mediation.
This chapter describes some of the recent restorative justice innovations and research that substantiates their usefulness. It explores developments in the conceptualization of restorative justice based on emergence of new practices and reasons for the effectiveness of restorative justice as a movement and restorative dialogue as application. Chaos theory offers a better way to view the coincidental timeliness of the emergence of restorative justice as a deeper way of dealing with human conflict. The chapter reviews restorative justice practices that have opened up areas for future growth. Those practices include the use of restorative practices for student misconduct in institutions of higher education, the establishment of surrogate dialogue programs in prison settings between unrelated crime victims and offenders. They also include the creation of restorative justice initiatives for domestic violence and the development of methods for engagement between crime victims and members of defense teams who represent the accused offender.
This book presents theoretical underpinnings of perinatal and pediatric bereavement, chapters on dimensions of perinatal and pediatric loss that have been of interest recently, and clinical interventions derived from research. It is divided into two sections. The first section has 10 chapters focusing on aspects of perinatal loss. It presents background content on various grief theories developed in the past five decades. These theories have expanded our understanding of the processes of death, dying, and bereavement. Grief after pregnancy loss can be more complicated for certain groups. The book provides a comprehensive overview of perinatal grief among lesbian couples and an overview of perinatal loss in adolescents, discussing normal adolescent growth and development, and using Sanders’s integrated theory of bereavement to discuss the common physical, emotional, social, and cognitive reactions to loss. The second section has eight chapters focusing on various aspects of caring for families whose children are dying or who have died, and caring for children who are grieving. Sometimes, the death of a child can occur under traumatic circumstances, setting the stage for very intense psychological responses. The book focuses on the impact of the cause of the death on posttraumatic stress responses and overall parental health after the traumatic loss of a child and describes supportive interventions for bereaved parents. Suicide is one of the most traumatic losses a family can experience. Finally, the book presents the importance of creating and capturing meaningful moments in the time leading up to and after the death of a child, focusing on the importance of relationships among families and professionals as they prepare for the child’s death.