# A 28-year-old primigravida at 20 weeks gestation visits the prenatal clinic complaining of leg cramps that occur primarily at night. Which assessment finding would be most important for the nurse to evaluate first?

> source: MyMerci (mymerci.kr)  
> url: https://mymerci.kr/pages/nclex_q.php?qn_id=542834  
> language: ko  
> subject: Maternal Newborn Health

## 문제

A 28-year-old primigravida at 20 weeks gestation visits the prenatal clinic complaining of leg cramps that occur primarily at night. Which assessment finding would be most important for the nurse to evaluate first?

## 보기

1. Frequency and duration of daily exercise
2. Intake of caffeinated beverages
3. Dietary calcium and magnesium intake **✔ 정답**
4. Sleep position and pillow arrangement

**정답: 3**

## 해설

Leg cramps in pregnancy are often due to calcium and magnesium deficiencies. Assessing dietary intake of these minerals is the priority to guide supplementation. Other factors like exercise or sleep position are less critical initial assessments.

## 심화 해설

Clinical Reasoning and Prioritization

This question requires you to prioritize your assessment based on the most likely physiological cause of nocturnal leg cramps in a healthy primigravida at 20 weeks gestation. While all listed options can be contributing factors, the first and most critical area to evaluate is the patient's dietary intake of specific micronutrients, specifically calcium and magnesium.

Pathophysiology and Rationale for Priority Assessment

Leg cramps during pregnancy are often linked to alterations in neuromuscular function and electrolyte imbalances. The rationale for prioritizing dietary intake of calcium and magnesium is rooted in their direct roles in muscle contraction and relaxation. A deficiency in either mineral disrupts this balance, leading to neuronal hyperexcitability and spontaneous muscle spasms.

The provided evidence underscores the critical role of magnesium in neurological and muscular stability. According to the research, magnesium plays a key role in regulating the sleep-wake cycle and neurological excitability [1]. The mechanism involves magnesium's ability to reduce neuronal excitability; a deficit can lead to a state of hyperexcitability, which clinically manifests as involuntary muscle contractions, including nocturnal leg cramps [1]. This directly supports why assessing for inadequate dietary intake of magnesium is a high-priority nursing action, as it targets a primary, modifiable physiological mechanism. Similarly, calcium is essential for muscle fiber contraction, and its imbalance works synergistically with magnesium deficiency to trigger cramping. Therefore, a detailed dietary history of these two minerals is the most direct path to identifying the root cause.

Analysis of Other Options

- Option 1: Frequency and duration of daily exercise. While excessive exercise or muscle fatigue can contribute to leg cramps, it is a secondary factor. The primary physiological trigger in pregnancy is often a nutritional deficiency. Evaluating exercise is important but does not take precedence over identifying a potential electrolyte imbalance that directly affects neuromuscular transmission.

- Option 2: Intake of caffeinated beverages. Caffeine is a diuretic and a central nervous system stimulant. While high intake could theoretically contribute to dehydration or increased muscle tension, it is not the most direct or common physiological cause of pregnancy-related leg cramps. This assessment is less of a priority than evaluating the specific minerals known to stabilize nerve and muscle cell membranes.

- Option 4: Sleep position and pillow arrangement. Positioning can influence circulation and nerve compression, which may trigger cramps. However, in the context of pregnancy, the hormonal and metabolic shifts that alter mineral requirements and electrolyte balance are a more profound and direct cause. The nurse should first rule out a biochemical cause before focusing on mechanical factors like sleep posture.

Clinical Application for NCLEX-RN

For NCLEX-RN questions involving prioritization, always select the option that addresses the most direct physiological mechanism or the most urgent threat to homeostasis. Here, the mechanism is neuromuscular instability caused by a potential deficiency in magnesium and calcium. The research confirms that magnesium is integral to reducing neuronal excitability, and its deficiency is a direct pathway to the symptom of cramping [1]. Your first assessment should be to gather data on the intake of these crucial minerals to confirm or rule out the most likely etiology before exploring other contributing factors.References (research sources)

- [1]The Mechanisms of Magnesium in Sleep Disorders.Research articleHe C, Wang B, Chen X, Xu J, Yang Y, Yuan M. (2025) · DOI: 10.2147/nss.s552646

## 임상 시나리오

Clinical Practice Guide: Nocturnal Leg Cramps in Pregnancy

**Primary Assessment:** The initial nursing priority for a primigravida at 20 weeks gestation reporting nocturnal leg cramps is a detailed dietary history focusing on calcium and magnesium intake. Deficiencies in these minerals are the most common modifiable physiological causes, as they directly affect neuromuscular excitability and muscle relaxation.

**Pathophysiology:** Magnesium regulates neuronal excitability by blocking calcium influx into nerve cells. A deficiency leads to uncontrolled calcium entry, causing neuronal hyperexcitability and spontaneous muscle contractions. Calcium is essential for muscle fiber contraction; an imbalance disrupts the contraction-relaxation cycle, manifesting as cramps.

**Evidence-Based Intervention:** Research indicates that magnesium supplementation, often combined with vitamin B6, can significantly reduce the frequency and intensity of pregnancy-related leg cramps. The recommended first-line approach is dietary counseling to increase intake of magnesium-rich foods (e.g., nuts, seeds, leafy greens) and calcium-rich foods (e.g., dairy, fortified products).

**Differential Assessment:** After ruling out nutritional deficits, the nurse should evaluate secondary factors. Assess sleep position (supine position can compress the vena cava, reducing circulation), hydration status, and daily activity levels. Instruct the patient on dorsiflexion of the foot to break an active cramp and stretching exercises before sleep.

**Safety Consideration:** Always confirm any supplementation with the primary obstetric provider before recommending it. Excessive magnesium intake can cause diarrhea and, in rare cases, toxicity, while improper calcium dosing may interfere with iron absorption.

## 핵심 개념

- **Neuronal hyperexcitability** — A state where nerves become overly sensitive and fire spontaneously, often due to electrolyte imbalances like low magnesium or calcium, leading to muscle cramps.
- **Neuromuscular function** — The integrated system involving nerves and muscles; requires a proper balance of calcium for contraction and magnesium for relaxation to prevent spasms.
- **Primigravida** — A woman who is pregnant for the first time.
- **Electrolyte imbalance** — An abnormality in the concentration of minerals in the body, such as calcium and magnesium, which can disrupt nerve signaling and muscle function.

## 같은 주제 문제

- [A 32-year-old multigravida at 28 weeks gestation reports experiencing leg cramps that occu…](https://mymerci.kr/pages/nclex_q.php?qn_id=542832)
- [A 25-year-old primigravida at 32 weeks gestation comes to the prenatal clinic complaining …](https://mymerci.kr/pages/nclex_q.php?qn_id=542833)
- [A 32-year-old primigravida at 32 weeks gestation visits the prenatal clinic complaining of…](https://mymerci.kr/pages/nclex_q.php?qn_id=542835)
- [A pregnant client at 28 weeks gestation reports experiencing frequent heartburn and asks t…](https://mymerci.kr/pages/nclex_q.php?qn_id=542836)
- [A pregnant client at 28 weeks gestation reports experiencing severe heartburn that interfe…](https://mymerci.kr/pages/nclex_q.php?qn_id=542837)
- [A pregnant client at 32 weeks gestation reports experiencing leg cramps that occur primari…](https://mymerci.kr/pages/nclex_q.php?qn_id=542838)

---

More free questions: [기출문제](https://mymerci.kr/)

_학습 참고용입니다. 실제 임상은 최신 지침과 소속 기관 프로토콜을 따르세요._