Which of the following effects is unassociated with cardiac glycosides?

Cardiac glycosides, such as digoxin, are primarily used to manage certain heart conditions, notably heart failure and atrial fibrillation. They have several key effects on the cardiovascular system that include improving cardiac contractility, decreasing heart rate, and providing antiarrhythmic effects.

The correct choice highlights that increased signs of dyspnea are not typically associated with the action of cardiac glycosides, as these medications generally enhance heart function, which can lead to improved pulmonary circulation and reduced congestion. In contrast, dyspnea is often a symptom of heart failure or pulmonary edema. Therefore, if a patient were experiencing increased dyspnea, it would likely indicate worsening heart failure or another underlying condition rather than a direct effect of cardiac glycosides.

By understanding the primary therapeutic outcomes of cardiac glycosides, one can better evaluate their clinical impact and the expected symptoms in patients receiving these medications. This knowledge underscores the importance of monitoring patient responses and managing heart failure symptoms effectively.