Acid/Base

The serum potassium level of a client who has diabetic ketoacidosis is 5.4 mEq/L (5.4 mmol/L). What would the nurse expect to see on the ECG tracing monitor? 1. Abnormal P waves and depressed T waves 2. Peaked T waves and widened QRS complexes 3. Abnormal Q waves and prolonged ST segments 4. Peaked P waves and an increased number of T waves

2. Potassium is the principal intracellular cation, and during ketoacidosis it moves out of cells into the extracellular compartment to replace potassium lost as a result of glucose-induced osmotic diuresis; overstimulation of the cardiac muscle results. The T wave is depressed in hypokalemia. Initially, the QT segment is short, and as the potassium level rises, the QRS complex widens. P waves are abnormal because the PR interval may be prolonged and the P wave may be lost; however, the T wave is peaked, not depressed. The ST segment becomes depressed. The PR interval is prolonged, and the P wave may be lost. QRS complexes and thus T waves become irregular, and the rate does not necessarily change.

A client is experiencing persistent vomiting, and serum electrolytes have been prescribed. The nurse should monitor which laboratory results? 1. Sodium and chloride levels 2. Bicarbonate and sulfate levels 3. Magnesium and protein levels 4. Calcium and phosphate levels

Sodium, which helps regulate the extracellular fluid volume, is lost with vomiting. Chloride, which balances cations in the extracellular compartment, also is lost with vomiting. Because sodium and chloride are parallel electrolytes, hyponatremia will accompany hypochloremia. Bicarbonate and sulfate levels, magnesium and protein levels, and calcium and phosphate levels do not provide significant information in relation to the effects of vomiting.

A client presenting to the emergency department with chest pain and dizziness is found to be having a myocardial infarction and subsequently suffers cardiac arrest. The healthcare team is able to successfully resuscitate the client. Lab work shows that the client now is acidotic. How does the nurse interpret the cause of the acidosis? 1. The fat-forming ketoacids were broken down. 2. The irregular heartbeat produced oxygen deficit. 3. The decreased tissue perfusion caused lactic acid production. 4. The client received too much sodium bicarbonate during resuscitation efforts.

3. Cardiac arrest causes decreased tissue perfusion, which results in ischemia and cardiac insufficiency. Cardiac insufficiency causes anaerobic metabolism, which leads to lactic acid production. Fat-forming ketoacids occur in diabetes. An irregular heartbeat does not cause acidosis. Too much sodium bicarbonate causes alkalosis, not acidosis.

A client with colitis has had a hemicolectomy. Three days after surgery the nurse identifies that the client has abdominal distention and absent bowel sounds, and has vomited 300 mL of dark green viscous fluid. The nurse contacts the primary healthcare provider and recommends which intervention? 1. Nasogastric tube for decompression 2. Antiemetic for nausea/vomiting 3. Intravenous (IV) lactated Ringer for fluid replacement 4. Stat electrolytes to assess for probable electrolyte imbalance

1. Decompression removes collected secretions behind the nonfunctioning bowel segment (paralytic ileus), thus reducing pressure on the suture line and allowing healing. Vomiting will subside as the bowel is decompressed. Although IV lactated Ringer for fluid replacement is important, the primary concern is decompression of the bowel; the amount of fluid removed will direct fluid and electrolyte replacement therapy.

Which is an independent nursing action that should be included in the plan of care for a client after an episode of ketoacidosis? 1. Monitoring for signs of hypoglycemia resulting from treatment 2. Withholding glucose in any form until the situation is corrected 3. Giving fruit juices, broth, and milk as soon as the client is able to take fluids orally 4. Regulating insulin dosage according to the amount of ketones found in the client's urine

1. During treatment for acidosis, hypoglycemia may develop; careful observation for this complication should be made by the nurse. Withholding all glucose may cause insulin coma. Whole milk and fruit juices are high in carbohydrates, which are contraindicated immediately following ketoacidosis. The regulation of insulin depends on the prescription for coverage; the prescription usually depends on the client's blood glucose level rather than ketones in the urine.

Surgery to correct hypertrophic pyloric stenosis is performed on a 3-week-old infant who has been fed formula. Which postoperative feeding regimen is most appropriate? 1. Thickened formula 24 hours after surgery 2. Withholding of feedings for the first 24 hours 3. Regular formula feeding within 24 hours of the surgery 4. Additional glucose feedings as desired after the first 24 hours

An initial feeding of glucose and electrolytes in water or breast milk is given 4 to 6 hours after surgery. Once clear fluids are being retained, formula feedings are begun within 24 hours. Thickened formula 24 hours after surgery is not necessary. Regular formula should be started within 24 hours after surgery in an attempt to gradually return the infant to a full feeding schedule. Withholding feedings for the first 24 hours and providing additional glucose feedings as desired after the first 24 hours are not necessary.