What is the recommended treatment for a patient with supraventricular tachycardia (SVT) who is unresponsive to adenosine?

In the management of supraventricular tachycardia (SVT) that is unresponsive to adenosine, the use of diltiazem for intravenous administration serves as an effective alternative treatment strategy. Diltiazem is a calcium channel blocker that works by slowing down conduction through the AV node and can help to terminate certain types of SVT. When adenosine is ineffective, diltiazem can be administered as a loading dose, with subsequent doses as needed, to effectively manage the tachyarrhythmia.

Diltiazem's rapid onset of action makes it particularly useful in acute settings where immediate control of heart rate is sought. In addition to its effectiveness in managing heart rate, diltiazem has a favorable safety profile and is commonly used in these scenarios, especially in patients who may not tolerate other medications well.

Other medications listed do have roles in the treatment of SVT but are not typically first-line or preferred in this specific case. Digoxin, for example, may have a delayed onset and is generally not used for immediate acute management of SVT. Ibutilide is an antiarrhythmic agent that may be used for atrial fibrillation or flutter rather than SVT, and its use