TETRALOGY OF FALLOT.
Pulmonary Stenosis, Ventricular Septal Defect, Dextroposition of the Aorta and Right Ventricular Hypertrophy.
PRESENTED BY N. TOSAH TO Ms PATIENCE OKOROAFOR RN, BSN, AS PARTIAL FULFILMENT OF THE COMPLETION OF THE COURSE REQUIREMENTS FOR NUR 242 (PEDIATRICS)
3/25/2013
ABSTRACT: Tetralogy of fallot is a congenital defect consisting of four anomalies. We will look at the causes of tetralogy of fallot, its signs and symptoms, how it is diagnosed, medical management and the final treatment for I which is corrective surgery.
The following definition from The Encyclopedia and Dictionary of Medicine, Nursing and Allied Health says it all, it defines tetralogy of fallot as …show more content…
It is the narrowing of the right ventricular outflow tract. It can occur at the pulmonary valve and in this case it is called valvular stenosis or just below that valve. In this second case it is referred to as infundibular stenosis. Infundibular pulmonic stenosis is mostly caused by overgrowth of the heart muscle wall or hypertrophy of the heart as is commonly known. Pulmonary stenosis is the major cause of the malformations, with the other associated malformations acting as compensatory mechanisms to the pulmonic stenosis. The degree of stenosis varies between individuals with tetralogy of fallot, and is the primary determinant of how severe the symptoms can be. Sharon L. Lewis, Margaret McLean et al state; “Pulmonary stenosis is almost always congenital. Tricuspid and pulmonic stenosis both result in an increase in blood volume in the right atrium and right ventricle. Tricuspid stenosis results in right atrial enlargement and elevated systemic venous pressure”. (Medical-Surgical Nursing Assessment and Management of Clinical Problems. pp. …show more content…
The precise mechanism of these episodes is not well-known. It is believed that it results from an increase in resistance to blood flow to the lungs with increased preferential flow of desaturated blood to the body. Tet spells are characterized by a sudden, marked increase in cyanosis followed by syncope, and may result in hypoxic brain injury and death. Older children will often squat during spells. This squatting tends to increase systemic vascular resistance and allows for a temporary reversal of the shunt. We will now look at what is believed to be its