Only a few conditions, such as obstructed airway or a sucking wound of the chest, take precedence over the immediate control of hemorrhage. Stopping bleeding is essential to the care and sur-vival of patients in an emergency or disaster situation. Hemor-rhage that results in the reduction of circulating blood volume is a primary cause of shock. Minor bleeding, which is usually venous, generally stops spontaneously unless the patient has a bleeding disorder or has been taking anticoagulants.
The patient is assessed for signs and symptoms of shock: cool, moist skin (resulting from poor peripheral perfusion), falling blood pressure, increasing heart rate, delayed capillary refill, and decreasing urine volume (a late sign) (Chart 71-5). The goals of emergency management are to control the bleeding, maintain an adequately circulating blood volume for tissue oxygenation, and prevent shock. Patients who hemorrhage are at risk for cardiac ar-rest caused by hypovolemia with secondary anoxia. Nursing in-terventions are carried out collaboratively with other members of the emergency health care team.
Whenever a patient is experiencing hemorrhage—whether exter-nal or internal—a loss of circulating blood results in a fluid vol-ume deficit and decreased cardiac output. Therefore, fluid replacement is imperative to maintain circulation. Typically, two large-bore intravenous cannulae are inserted to provide a means for fluid and blood replacement, and blood samples are obtained for analysis, typing, and cross-matching.
Replacement fluids are administered as prescribed, depending on clinical estimates of the type and volume of fluid lost. Replacement fluids may include isotonic electrolyte solutions (lactated Ringer’s, normal saline), colloid, and blood component therapy.
Packed red blood cells are infused when there is massive blood loss. In emergencies, O-negative blood is used for women of childbearing age and O-positive blood is used for men and for postmenopausal women. In an emergent situation, there is not time to type and cross-match or type and screen blood. O-negative blood provides safe administration of blood imme-diately without sensitizing an Rh-negative woman to Rh-positive blood. Sensitization can result in difficulties during pregnancy later.
Additional platelets and clotting factors are given when large amounts of blood are needed, because replacement blood is defi-cient in clotting factors
If a patient is hemorrhaging externally (eg, from a wound), a rapid physical assessment is performed as the patient’s clothing is cut away in an attempt to identify the area of hemorrhage. Direct, firm pressure is applied over the bleeding area or the involved artery (Fig. 71-2). Most bleeding can be stopped or at least controlled by application of direct pressure. Otherwise, unchecked arterial bleeding results in death. A firm pressure dressing is applied, and the injured part is elevated to stop venous and capillary bleeding if possible. If the injured area is an ex-tremity, the extremity is immobilized to control blood loss.
A tourniquet is applied to an extremity only as alast resort when the external hemorrhage cannot be controlled inany other way. Care must be taken when applying a tourniquet because of the risk of loss of the extremity. The tourniquet is ap-plied just proximal to the wound and tied tightly enough to con-trol arterial blood flow. The patient is tagged with a skin-marking pencil or on adhesive tape on the forehead with a “T,” stating the location of the tourniquet and the time applied. Periodically, the tourniquet is loosened to prevent irreparable vascular or neuro-logic damage. If there is arterial bleeding, the tourniquet is re-moved and a pressure dressing is applied. If the patient has suffered a traumatic amputation with uncontrollable hemorrhage, the tourniquet remains in place until the patient is in the operat-ing room.
If the patient shows no external signs of bleeding but exhibits tachycardia, falling blood pressure, thirst, apprehension, cool and moist skin, or delayed capillary refill, internal hemorrhage is sus-pected.
Typically, packed red blood cells (O-negative) are ad-ministered at a rapid rate, and the patient is prepared for more definitive treatment (eg, surgery, pharmacologic therapy). Addi-tionally, arterial blood specimens are obtained to evaluate pul-monary function and tissue perfusion and to establish baseline hemodynamic parameters, which are then used as an index for determining the amount of fluid replacement the patient can tol-erate and the response to therapy. The patient is maintained in the supine position and monitored closely until hemodynamic or circulatory parameters improve, or until transport to the operating room or intensive care.
Copyright © 2018-2020 BrainKart.com; All Rights Reserved. Developed by Therithal info, Chennai.