# A nurse compares uterine activity recordings from four clients receiving oxytocin. For this frequency assessment, tachysystole means more than five contractions per 10 minutes, averaged over 30 minutes. Click the complete recording that meets this definition.

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> language: en  
> subject: Reduction of Risk Potential  
> category: ROR

## Question

A nurse compares uterine activity recordings from four clients receiving oxytocin. For this frequency assessment, tachysystole means more than five contractions per 10 minutes, averaged over 30 minutes. Click the complete recording that meets this definition.

![](https://mymerci.kr/data/nclex/hotspot/regen_20260908_2350/HSR528.svg)

## Explanation

B has 18 contractions in 30 minutes, averaging six per 10 minutes.

## In-depth explanation

Quick answer
B. B has 18 contractions in 30 minutes, averaging six per 10 minutes.
Why this is the best choice
Count the events across the entire row before dividing by three. A brief crowded segment does not establish the stated 30-minute average. This question addresses frequency only; fetal response, relaxation and other findings must also be assessed.
Clinical picture
The observations are fictional teaching data. Apply the stated context; the selected feature does not by itself replace a complete bedside assessment.
Memory hook
Use the complete specified time window; do not extrapolate its busiest segment.
Decision rule
Use the complete specified time window; do not extrapolate its busiest segment.
Why the other regions do not fit
A has 15 total despite seven in its first 10 minutes. C also has 15 total despite six in its final block. Both average five, not more than five. D has 12 total and averages four.
**Sources**
- Tachysystole is more than five contractions per 10 minutes averaged over 30 minutes.

## Key concepts

- **Contraction frequency across a complete observation window** — Use the complete specified time window; do not extrapolate its busiest segment.
- **Comparison with context** — A looks most crowded initially but does not exceed the full-window threshold.

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