A nurse is teaching a client who has a new prescription for transdermal nitroglycerin to treat angina pectoris. Which of the following instructions should the nurse include in the teaching?

Choice A reason: Expecting to gain weight while taking this medication is not a correct instruction, as it may discourage the client from adhering to the treatment and may worsen the hypertension. Captopril is an angiotensin-converting enzyme (ACE) inhibitor that lowers the blood pressure by preventing the formation of angiotensin II, a potent vasoconstrictor. Captopril does not cause significant weight gain, but it may cause fluid retention or edema in some cases. The nurse should advise the client to monitor the weight daily and report any sudden or excessive increase to the provider.

Choice B reason: Not using salt substitutes while taking this medication is a correct instruction, as it may prevent the risk of hyperkalemia, a potentially life-threatening condition. Captopril may increase the potassium level in the blood by reducing the secretion of aldosterone, a hormone that regulates the sodium and potassium balance. Salt substitutes may contain potassium chloride, which may further elevate the potassium level. The nurse should advise the client to avoid salt substitutes and high-potassium foods, such as bananas, oranges, or tomatoes, and to have regular blood tests to check the electrolyte levels.

Choice C reason: Counting the pulse rate before taking the medication is not a necessary instruction, as it may not reflect the effect of the medication on the blood pressure. Captopril does not affect the heart rate significantly, but it may lower the blood pressure too much, especially in the first few weeks of treatment or after a dose increase. This may cause hypotension, dizziness, or fainting. The nurse should advise the client to monitor the blood pressure regularly and report any symptoms of hypotension to the provider.

Choice D reason: Taking the medication with food is not a correct instruction, as it may reduce the absorption and effectiveness of the medication. Captopril should be taken on an empty stomach, at least one hour before or two hours after a meal, to ensure optimal bioavailability. The nurse should advise the client to take the medication at the same time every day and to avoid skipping or doubling the doses.

Choice A - Catheter Occlusion: This occurs when the catheter is blocked, preventing the flow of fluids or medication. It is usually indicated by difficulty in flushing the catheter or a slow drip rate¹. However, it does not typically cause a gurgling sound.

Choice B - (Catheter migration) is correct because when a central venous catheter (CVC) migrates from its original position, the tip can enter a smaller vein or a different location where turbulence occurs. This may cause the client to hear a gurgling or bubbling sound, especially during infusion or with position changes. Migration can happen due to coughing, movement, or changes in pressure, and it doesn’t necessarily involve the catheter being visibly out of place

Choice C - (Catheter dislodgment) is incorrect because dislodgment typically refers to the catheter being partially pulled out of the insertion site. This would be more likely to cause external signs like visible catheter movement or fluid leakage at the insertion site, rather than internal gurgling sounds. Gurgling is more associated with internal changes in catheter position, as seen with migration.

Choice D - Catheter Rupture: This is a break or tear in the catheter. It can cause serious complications, including infection and embolism. However, a gurgling sound is not a typical symptom of a catheter rupture¹.