The nurse is caring for a client who is being discharged following coronary artery bypass graft surgery. Discharge instructions would include:

A. Recent intake of sildenafil:
While there is a potential drug interaction between atenolol (a beta-blocker) and sildenafil (a phosphodiesterase inhibitor used for erectile dysfunction), this alone would not necessarily be an indication to hold atenolol. Sildenafil can cause hypotension, which might be exacerbated by atenolol, especially in older adults or those with cardiovascular issues. However, this interaction usually requires monitoring rather than immediate discontinuation of atenolol, unless the client is symptomatic (e.g., feeling faint, dizziness). If symptoms of hypotension occur after taking both medications, the nurse would assess the client's condition but would not automatically hold atenolol based solely on this information.

B. Heart rate 52 and blood pressure 90/56: The most concerning finding in a client receiving atenolol (a beta-blocker) for angina is a heart rate of 52 beats per minute (bradycardia) and a blood pressure of 90/56 mmHg (hypotension). Beta-blockers, such as atenolol, work by reducing the heart rate and lowering blood pressure. A heart rate of 52 beats per minute is below the typical threshold of 60 beats per minute and indicates bradycardia, which could worsen due to the medication's effects. Additionally, hypotension (blood pressure 90/56) can be dangerous, especially when combined with bradycardia. Both of these findings suggest that the client may be experiencing excessive beta-blockade, which could lead to severe complications such as cardiogenic shock or arrhythmias. Therefore, the nurse should hold the medication and contact the provider for further assessment and possible adjustment of the treatment plan.

C. Restlessness and mild confusion:
Restlessness and mild confusion could indicate several possible issues, such as hypoxia, electrolyte imbalances, or medication side effects. While beta-blockers can cause side effects like fatigue or depression, restlessness and confusion are not common acute reactions to atenolol. However, if these symptoms are due to hypotension or bradycardia from the atenolol, then holding the medication and notifying the provider may be warranted. Nonetheless, these symptoms alone are not a clear cause to immediately hold atenolol without further assessment.

D. Positional vertigo and wheezing:
Positional vertigo can occur due to a variety of causes, including inner ear issues, hypotension, or even medication side effects. Wheezing, however, raises concerns about potential bronchospasm, which is a known side effect of non-cardioselective beta-blockers. Atenolol is a cardioselective beta-blocker, meaning it is less likely to cause bronchospasm compared to non-cardioselective agents like propranolol. While wheezing could indicate a reaction to the medication, it is not a primary concern with atenolol, unless the client has a history of asthma or chronic obstructive pulmonary disease (COPD). If wheezing occurs, the nurse should still monitor the client but would not necessarily hold atenolol immediately unless the symptoms are severe.

A. and record vital signs every 4 hours:
While vital signs are important, monitoring every 4 hours may not be frequent enough in an intensive care setting, especially for a client requiring mechanical ventilation. Vital signs, including blood pressure, heart rate, respiratory rate, and oxygen saturation, should be monitored more frequently (at least every hour) to detect changes in the patient's condition, particularly since positive pressure ventilation can significantly affect circulatory status.

B. Intake and output hourly:
In acute respiratory distress syndrome (ARDS), the client may require mechanical ventilation to support breathing. Positive pressure ventilation, while essential for improving oxygenation, can increase intrathoracic pressure, which may impair venous return to the heart, decreasing cardiac output. As a result, it is critical to monitor the fluid balance closely, as fluid overload can worsen the patient's condition and contribute to pulmonary edema or other complications. Hourly assessment of intake and output (I&O) helps the nurse monitor renal function, fluid status, and cardiac output. Maintaining a proper balance of fluids is crucial in managing ARDS and its associated complications.

C. Heart and lung sounds every shift:
A shift assessment of heart and lung sounds is useful but is not frequent enough to detect early changes in a client with decreased cardiac output or other complications related to mechanical ventilation. More frequent monitoring of lung sounds and heart function may be necessary, particularly in clients at risk of ventilator-associated complications like ventilator-associated pneumonia (VAP), pulmonary edema, or arrhythmias.

D. Level of consciousness every shift:
Monitoring level of consciousness is important, especially in clients with ARDS and mechanical ventilation, as changes in consciousness can indicate worsening hypoxia or hypercapnia. However, this assessment is less directly related to the immediate concern of decreased cardiac output, which can be more effectively managed through continuous monitoring of fluid status and vital signs rather than consciousness alone. Though consciousness should be monitored regularly, I&O hourly would be more crucial in this context for managing cardiac output.