Which of the following medicine should be administered using the double syringe technique?

NORCET 6 mains-2024

Pharmacology

Easy

Appeared in: NORCET 6 mains-2024

Explanation

Adenosine has an extremely short half-life, typically less than 10 seconds, meaning it is metabolized very quickly in the bloodstream.
To be effective in treating supraventricular tachycardia (SVT), it must reach the AV node of the heart before it degrades.
The double syringe technique involves a rapid IV push of adenosine immediately followed by a rapid saline flush, ensuring the medication is propelled into the central circulation and reaches the heart in time.
This specific technique is uniquely critical for adenosine's efficacy, unlike other emergency medications.

Option A: Epinephrine is given as an IV push in emergencies like cardiac arrest and is followed by a flush, but its half-life is longer than adenosine's, so the specific double-syringe technique is not essential for its effectiveness.
Option B: Rapid IV administration of amiodarone can cause severe hypotension and bradycardia. It is typically given as a slower bolus over 10-60 minutes or as a continuous infusion.
Option D: Valproic acid is an anticonvulsant medication used to treat seizures and bipolar disorder. It is administered as a slow IV infusion, not a rapid bolus.

Visual 1: Diagram - A diagram illustrating the double syringe technique using a 3-way stopcock. One syringe contains adenosine, and the other contains a normal saline flush, both connected to the patient's IV line. This visual helps clarify the setup for rapid administration.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Pharmacology: Administration of Emergency Cardiovascular Medications as background academic context rather than a clinical decision trigger.
Correct administration of adenosine is critical for its therapeutic effect; improper or slow technique will lead to treatment failure as the drug degrades before reaching the heart.
Nurses must monitor the patient's ECG continuously during administration, as a brief period of asystole or bradycardia is an expected (though transient) effect indicating the drug has reached the AV node.
Patient education is key: warn the patient about the common, transient sensations of flushing, chest pressure, or a feeling of 'impending doom' to reduce anxiety.

How to Approach the Question

Identify the core of the question: it asks for a drug requiring a specific, rapid administration method called the 'double syringe technique'.
Recognize that this technique implies a need for a very fast bolus followed by an immediate flush.
Recall the pharmacokinetic properties of the listed emergency medications.
Focus on the drug with the most unique property related to speed of action. Adenosine is well-known for its extremely short half-life (less than 10 seconds).
Connect this short half-life to the necessity of a rapid push-flush method to ensure the drug reaches its site of action (the AV node) before being metabolized.
Eliminate the other options by recalling their standard administration protocols: Epinephrine (standard IV push), Amiodarone (slow IV bolus/infusion), and Valproic acid (slow IV infusion).

Concept Tested & Keywords

Concept Tested: Pharmacology: Administration of Emergency Cardiovascular Medications
Stem keywords: medicine, administered, double syringe technique
Lead-in keywords: Which
Negative lead-in flag: false

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