RNSG 2201 EXAM 5 CHAPTERS 23, 24, 25, 26. GOLD LEVEL EXPERT RECOMMENDS. DOWNLOAD TO SCORE A

RNSG 2201 EXAM 5 RNSG 2201. EXAM # 5 RNSG 2201 CH. 23, 24, 25, 26 Chapter 23: The Child with Fluid and Electrolyte Imbalance MULTIPLE CHOICE 1. What substance is released from the posterior pituitary gland and promotes water retention in the renal system? a. Renin b. Aldosterone c. Angiotensin d. Antidiuretic hormone (ADH) ANS: D ADH is released in response to increased osmolality and decreased volume of intravascular fluid; it promotes water retention in the renal system by increasing the permeability of renal tubules to water. Renin release is stimulated by diminished blood flow to the kidneys. Aldosterone is secreted by the adrenal cortex. It enhances sodium reabsorption in renal tubules, promoting osmotic reabsorption of water. Renin reacts with a plasma globulin to generate angiotensin, which is a powerful vasoconstrictor. Angiotensin also stimulates the release of aldosterone. 2. Nurses should be alert for increased fluid requirements in which circumstance? a. Fever b. Mechanical ventilation c. Congestive heart failure d. Increased intracranial pressure ANS: A Fever leads to great insensible fluid loss in young children because of increased body surface area relative to fluid volume. The mechanically ventilated child has decreased fluid requirements. Congestive heart failure is a case of fluid overload in children. Increased intracranial pressure does not lead to increased fluid requirements in children. 3. What factor predisposes an infant to fluid imbalances? a. Decreased surface area b. Lower metabolic rate c. Immature kidney functioning d. Decreased daily exchange of extracellular fluid ANS: C The infants kidneys are functionally immature at birth and are inefficient in excreting waste products of metabolism. Infants have a relatively high body surface area (BSA) compared with adults. This allows a higher loss of fluid to the environment. A higher metabolic rate is present as a result of the higher BSA in relation to active metabolic tissue. The higher metabolic rate increases heat production, which results in greater insensible water loss. Infants have a greater exchange of extracellular fluid, leaving them with a reduced fluid reserve in conditions of dehydration. 4. What is the required number of milliliters of fluid needed per day for a 14-kg child? a. 800 b. 1000 c. 1200 d. 1400 ANS: C For the first 10 kg of body weight, a child requires 100 ml/kg. For each additional kilogram of body weight, an extra 50 ml is needed. 10 kg 100 ml/kg/day = 1000 ml 4 kg 50 ml/kg/day = 200 ml 1000 ml + 200 ml = 1200 ml/day Eight hundred to 1000 ml is too little; 1400 ml is too much. 5. An infant is brought to the emergency department with the following clinical manifestations: poor skin turgor, weight loss, lethargy, tachycardia, and tachypnea. This is suggestive of which situation? a. Water excess b. Sodium excess c. Water depletion d. Potassium excess ANS: C These clinical manifestations indicate water depletion or dehydration. Edema and weight gain occur with water excess or overhydration. Sodium or potassium excess would not cause these symptoms. 6. Clinical manifestations of sodium excess (hypernatremia) include which signs or symptoms? a. Hyperreflexia b. Abdominal cramps c. Cardiac dysrhythmias d. Dry, sticky mucous membranes ANS: D Dry, sticky mucous membranes are associated with hypernatremia. Hyperreflexia is associated with hyperkalemia. Abdominal cramps, weakness, dizziness, nausea, and apprehension are associated hyponatremia. Cardiac dysrhythmias are associated with hypokalemia. 7. What laboratory finding should the nurse expect in a child with an excess of water? a. Decreased hematocrit b. High serum osmolality c. High urine specific gravity d. Increased blood urea nitrogen ANS: A The excess water in the circulatory system results in hemodilution. The laboratory results show a falsely decreased hematocrit. Laboratory analysis of blood that is hemodiluted reveals decreased serum osmolality and blood urea nitrogen. The urine specific gravity is variable relative to the childs ability to correct the fluid imbalance. 8. What clinical manifestation(s) is associated with calcium depletion (hypocalcemia)? a. Nausea, vomiting b. Weakness, fatigue c. Muscle hypotonicity d. Neuromuscular irritability ANS: D Neuromuscular irritability is a clinical manifestation of hypocalcemia. Nausea and vomiting occur with hypercalcemia and hypernatremia. Weakness, fatigue, and muscle hypotonicity are clinical manifestations of hypercalcemia. 9. What type of dehydration occurs when the electrolyte deficit exceeds the water deficit? a. Isotonic dehydration b. Hypotonic dehydration c. Hypertonic dehydration d. Hyperosmotic dehydration ANS: B Hypotonic dehydration occurs when the electrolyte deficit exceeds the water deficit, leaving the serum hypotonic. Isotonic dehydration occurs in conditions in which electrolyte and water deficits are present in balanced proportion. Hypertonic dehydration results from water loss in excess of electrolyte loss. This is the most dangerous type of dehydration. It is caused by feeding children fluids with high amounts of solute. Hyperosmotic dehydration is another term for hypertonic dehydration. 10. What amount of fluid loss occurs with moderate dehydration? a. 50 ml/kg b. 50 to 90 ml/kg c. 5% total body weight d. 15% total body weight ANS: B Moderate dehydration is defined as a fluid loss of between 50 and 90 ml/kg. Mild dehydration is defined as a fluid loss of less than 50 ml/kg. Weight loss up to 5% is considered mild dehydration. Weight loss over 15% is severe dehydration. 11. Physiologically, the child compensates for fluid volume losses by which mechanism? a. Inhibition of aldosterone secretion b. Hemoconcentration to reduce cardiac workload c. Fluid shift from interstitial space to intravascular space d. Vasodilation of peripheral arterioles to increase perfusion ANS: C Compensatory mechanisms attempt to maintain fluid volume. Initially, interstitial fluid moves into the intravascular compartment to maintain blood volume. Aldosterone is released to promote sodium retention and conserve water in the kidneys. Hemoconcentration results from the fluid volume loss. With less circulating volume, tachycardia results. Vasoconstriction of peripheral arterioles occurs to help maintain blood pressure. 12. Ongoing fluid losses can overwhelm the childs ability to compensate, resulting in shock. What early clinical sign precedes shock? a. Tachycardia b. Slow respirations c. Warm, flushed skin d. Decreased blood pressure ANS: A Shock is preceded by tachycardia and signs of poor tissue perfusion and decreased pulse oximetry values. Respirations are increased as the child attempts to compensate. As a result of the poor peripheral circulation, the child has skin that is cool and mottled with decreased capillary refilling after blanching. In children, lowered blood pressure is a late sign and may accompany the onset of cardiovascular collapse. 13. The presence of which pair of factors is a good predictor of a fluid deficit of at least 5% in an infant? a. Weight loss and decreased heart rate b. Capillary refill of less than 2 seconds and no tears c. Increased skin elasticity and sunken anterior fontanel d. Dry mucous membranes and generally ill appearance ANS: D A good predictor of a fluid deficit of at least 5% is any two four factors: capillary refill of more than 2 seconds, absent tears, dry mucous membranes, and ill general appearance. Weight loss is associated with fluid deficit, but the degree needs to be quantified. Heart rate is usually elevated. Skin elasticity is decreased, not increased. The anterior fontanel is depressed. 14. The nurse suspects fluid overload in an infant receiving intravenous fluids. What clinical manifestation is suggestive of water intoxication? a. Oliguria b. Weight loss c. Irritability and seizures d. Muscle weakness and cardiac dysrhythmias ANS: C Irritability, somnolence, headache, vomiting, diarrhea, and generalized seizures are manifestations of water intoxication. Urinary output is increased as the child attempts to maintain fluid balance. Weight gain is usually associated with water intoxication. Muscle weakness and cardiac dysrhythmias are not associated with water intoxication. 15. What physiologic state(s) produces the clinical manifestations of nervous system stimulation and excitement, such as overexcitability, nervousness, and tetany? a. Metabolic acidosis b. Respiratory alkalosis c. Metabolic and respiratory acidosis d. Metabolic and respiratory alkalosis ANS: D The major symptoms and signs of alkalosis include nervous system stimulation and excitement, including overexcitability, nervousness, tingling sensations, and tetany that may progress to seizures. Acidosis (both metabolic and respiratory) has clinical signs of depression of the central nervous system, such as lethargy, diminished mental capacity, delirium, stupor, and coma. Respiratory alkalosis has the same symptoms and signs as metabolic alkalosis. 16. What is an approximate method of estimating output for a child who is not toilet trained? a. Have parents estimate output. b. Weigh diapers after each void. c. Place a urine collection device on the child. d. Have the child sit on a potty chair 30 minutes after eating. ANS: B Weighing diapers will provide an estimate of urinary output. Each 1 g of weight is equivalent to 1 ml of urine. Having parents estimate output would be inaccurate. It is difficult to estimate how much fluid is in a diaper. The urine collection device would irritate the childs skin. It would be difficult for a toddler who is not toilet trained to sit on a potty chair 30 minutes after eating. 17. The nurse is selecting a site to begin an intravenous infusion on a 2-year-old child. The superficial veins on his hand and arm are not readily visible. What intervention should increase the visibility of these veins? a. Gently tap over the site. b. Apply a cold compress to the site. c. Raise the extremity above the level of the body. d. Use a rubber band as a tourniquet for 5 minutes. ANS: A Gently tapping the site can sometimes cause the veins to be more visible. This is done before the skin is prepared. Warm compresses (not cold) may be useful. The extremity is held in a dependent position. A tourniquet may be helpful, but if too tight, it could cause the vein to burst when punctured. Five minutes is too long. 18. When caring for a child with an intravenous (IV) infusion, what is an appropriate nursing action? a. Change the insertion site every 24 hours. b. Check the insertion site frequently for signs of infiltration. c. Use a macrodropper to facilitate reaching the prescribed flow rate. d. Avoid restraining the child to prevent undue emotional stress. ANS: B The nursing responsibility for IV therapy is to calculate the amount to be infused in a given length of time; set the infusion rate; and monitor the apparatus frequently, at least every 1 to 2 hours, to make certain that the desired rate is maintained, the integrity of the system remains intact, the site remains intact (free of redness, edema, infiltration, or irritation), and the infusion does not stop. Insertion sites do not need to be changed every 24 hours unless a problem is found with the site. This exposes the child to significant trauma. A minidropper (60 drops/ml) is the recommended IV tubing in pediatric patients. Intravenous sites should be protected. This may require soft restraints on the child. 19. The nurse determines that a childs intravenous infusion has infiltrated. The infused solution is a vesicant. What is the most appropriate nursing action? a. Stop the infusion and apply ice. b. End the infusion and notify the practitioner. c. Slow the infusion rate and notify the practitioner. d. Discontinue the infusion and apply warm compresses. ANS: B A vesicant causes cellular damage when even minute amounts escape into the tissue. The intravenous infusion is immediately stopped, the extremity is elevated, the practitioner is notified, and the treatment protocol is initiated. The applying of heat or ice depends on the fluid that has extravasated. The catheter is left in place until it is no longer needed. 20. Several types of long-term central venous access devices are used. What is a benefit of using an implanted port (e.g., Port-a-Cath)? a. You do not need to pierce the skin for access. b. It is easy to use for self-administered infusions. c. The patient does not need to limit regular physical activity, including swimming. d. The catheter cannot dislodge from the port even if the child plays with the port site. ANS: C No limitations on physical activity are needed. The child is able to participate in all regular physical activities, including bathing, showering, and swimming. The skin over the device is pierced with a Huber needle to access. Long-term central venous access devices are difficult to use for self-administration. The port is placed under the skin. If the child manipulates the device and plays with the actual port, the catheter can be dislodged. 21. The nurse is teaching the family of a child with a long-term central venous access device about signs and symptoms of bacteremia. What finding indicates the presence of bacteremia? a. Hypertension b. Pain at the entry site c. Fever and general malaise d. Redness and swelling at the entry site ANS: C Fever, chills, general malaise, and an ill appearance can be signs of bacteremia and require immediate intervention. Hypotension would be indicative of sepsis and possible impending cardiovascular collapse. Pain, redness, and swelling at the entry site indicate local infection. 22. What flush solution is recommended for intravenous catheters larger than 24 gauge? a. Saline b. Heparin c. Alteplase d. Heparin and saline combination ANS: A The recommended solution for flushing venous access devices is saline. The turbulent flow flush with saline is effective for catheters larger than 24 gauge. The use of heparin does not increase the longevity of the venous access device. In 24-gauge catheters, heparin may offer an advantage. Alteplase is used for treating catheter- related occlusions in children. The heparin and saline combination does not offer any advantage over saline or heparin individually. 23. The nurse is teaching a parent of a 10-year-old child who will be discharged with a venous access device (VAD). What statement by the parent indicates a correct understanding of the teaching? a. I should have my child wear a protective vest when my child