# Review the trend for a client receiving lacosamide and select the best interpretation and action.

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=522929&lang=en  
> language: en  
> subject: Adverse Effects/Contraindications/Interactions  
> category: PPT

## Question

Review the trend for a client receiving lacosamide and select the best interpretation and action.

| Time | Data |
| --- | --- |
| Baseline | Pulse 72/min; PR 188 ms; taking metoprolol; no dizziness |
| After titration | Pulse 58/min; PR 224 ms; intermittent lightheadedness |
| Current | Pulse 44/min; PR 286 ms; near-syncope while standing |

Q1. How should the trend be interpreted?

Expected seizure control without safety significance
Progressive medication-associated conduction slowing
Dehydration proven by the PR interval

Q2. Which action is appropriate now?

Give the next dose early
Encourage walking without monitoring
Hold lacosamide, obtain urgent ECG assessment, notify the prescriber, and review interacting conduction-slowing drugs

## Explanation

Progressive PR prolongation, bradycardia, dizziness, and near-syncope after lacosamide escalation—especially with another atrioventricular-node-slowing drug—require holding the dose, ECG evaluation, and prompt prescriber notification.

## In-depth explanation

Quick answer
Treat worsening conduction plus symptoms as a lacosamide safety signal.

Why this is correct
Lacosamide can prolong the PR interval and has been associated with bradycardia and atrioventricular block. Risk increases with underlying conduction disease or concomitant drugs that affect cardiac conduction.

Easy analogy or mental picture
Build a medication-safety chain: identify the new cue, connect it to the drug mechanism or labeled limitation, stop preventable exposure, stabilize the client, and verify a measurable response.

Memory hook
Drug, urgent cue, protective action, and reassessment endpoint.

NCLEX decision rule
Choose the action that prevents the most immediate medication-related harm while preserving indicated treatment and required monitoring.

Why the other choices are wrong
Options that continue a suspect exposure, normalize a labeled danger cue, substitute an unauthorized dose, or delay escalation leave the client at risk.References
1DailyMed: VIMPAT (lacosamide)PR-interval prolongation, bradycardia and atrioventricular block risk, ECG monitoring, and additive conduction effects

## Clinical scenario

Medication-safety review
Verify indication, current assessment, dose and route, organ function, interactions, urgent toxicity cues, authorized action, and measurable follow-up.

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