A nurse is assessing a client who has a pericardial effusion and has developed hypotension and muffled heart sounds.
Which of the following procedures should the nurse anticipate for this client?

Choice A rationale

Pulmonary edema occurs when fluid backs up into the lungs, usually due to left-sided heart failure. While pericardial fluid can affect heart function, pulmonary edema is not the most immediate or direct complication of fluid accumulation within the pericardial sac itself. Instead, the fluid in the sac creates external pressure on the heart. The focus of care for increased pericardial fluid is the restriction of cardiac filling rather than the primary congestion of the pulmonary vasculature.

Choice B rationale

Cardiac tamponade is a life-threatening condition where the accumulation of fluid in the pericardial sac increases intrapericardial pressure. This pressure prevents the heart chambers from expanding fully during diastole, which severely reduces stroke volume and cardiac output. Common signs include Beck's triad: hypotension, jugular venous distention, and muffled heart sounds. Immediate intervention is required because the heart can eventually stop beating entirely as it becomes unable to fill with blood due to external compression.

Choice C rationale

Pericarditis is the inflammation of the pericardium, which is often the underlying cause of fluid accumulation, known as pericardial effusion. While the nurse monitors for signs of inflammation, the question asks for a complication resulting from the fluid being dangerously increased. Pericarditis is the state of the tissue rather than the acute hemodynamic consequence of fluid volume. Therefore, preventing the functional collapse of the heart takes precedence over managing the inflammatory process in an emergency.

Choice D rationale

Pericardiocentesis is a medical procedure used to drain excess fluid from the pericardial sac to relieve pressure on the heart. It is a treatment modality rather than a complication. The nurse collaborates with the team to perform this procedure in order to treat or prevent cardiac tamponade. Since the question asks for a complication to prevent, choosing a treatment is logically incorrect. The goal is to avoid the physiological crisis that necessitates such an invasive intervention.

Choice A rationale

Sinus bradycardia is defined by a heart rate below 60 beats per minute with a regular rhythm and discernible P waves. In this case, the client has a heart rate of 92 per minute and an irregular rhythm, which immediately rules out bradycardia. Furthermore, sinus rhythms must have identifiable P waves and measurable PR intervals, both of which are absent in this client's presentation, pointing toward a more chaotic supraventricular origin.

Choice B rationale

First-degree heart block is characterized by a consistent delay in conduction between the atria and ventricles, resulting in a PR interval greater than 0.20 seconds. However, the rhythm remains regular, and P waves must be clearly visible and associated with every QRS complex. The client in the scenario has an irregular rhythm and unidentifiable P waves, which is inconsistent with the stable, albeit delayed, conduction seen in a first-degree block.

Choice C rationale

Supraventricular tachycardia usually manifests as a very rapid, regular rhythm with rates often exceeding 150 beats per minute. While P waves may be difficult to see because they are buried in the preceding T waves, the hallmark is the absolute regularity of the R-to-R intervals. The client's rhythm is described as irregular, which is the primary clinical feature that distinguishes atrial fibrillation from the regular, rapid pacing of a supraventricular tachycardia.

Choice D rationale

Atrial fibrillation is defined by the absence of discrete P waves and an irregularly irregular ventricular rhythm. The fibrillatory waves from the atria do not produce a measurable PR interval because there is no organized atrial depolarization. The QRS duration of 0.10 seconds is within the normal range of 0.06 to 0.12 seconds, indicating that ventricular conduction is still following the normal pathways once the atrioventricular node allows an impulse through.