During a musculoskeletal exam, the nurse asks a patient to raise their arm out to the side, away from the body. This movement is an example of:

Abdominal examination requires maximal relaxation of the rectus abdominis muscles to allow for accurate palpation of deep structures. Placing a small pillow under the head and having the patient flex the knees reduces tension on the abdominal wall. This position prevents voluntary guarding, which can otherwise obscure underlying masses or organomegaly.

A. Ask the patient to refrain from voiding before the exam: An overdistended bladder can cause significant discomfort during palpation and may be mistaken for an abdominal mass or suprapubic tenderness. Patients should be encouraged to empty their bladder immediately prior to the assessment to ensure comfort and diagnostic accuracy.

B. Position the patient's arms above the head: Placing arms above the head stretches the abdominal musculature, increasing wall tension and making deep palpation more difficult and uncomfortable. The arms should remain at the patient's sides or folded across the chest to promote the most relaxed state possible.

C. Examine painful areas on the abdomen first: Assessing tender areas at the start of the exam causes the patient to tense their muscles in anticipation of pain, making the rest of the assessment unreliable. Standard protocol dictates that the nurse should examine painful quadrants last to maintain muscle relaxation and patient trust.

D. Ask the patient to bend their knees slightly: Flexing the knees and hips relaxes the tension in the abdominal wall muscles. This mechanical shift makes the abdomen softer and more accessible for the clinician to perform light and deep palpation without resistance. It is a fundamental step in abdominal examination preparation.

During pregnancy, the enlarging uterus displaces the center of gravity anteriorly, necessitating a compensatory lumbar lordosis. This postural shift increases the mechanical strain on the paraspinal muscles and lower intervertebral discs. Hormonal changes, specifically the release of relaxin, further contribute to ligamentous laxity and joint instability.

A. Increased lumbar lordosis from the shift in the center of gravity: As the fetal weight increases, the mother leans backward to maintain balance, exaggerating the inward curve of the lower spine. This compensatory posture causes chronic muscle tension and lower back pain. It is the most common musculoskeletal finding in the third trimester.

B. Decreased mobility of the sacroiliac joints: Pregnancy actually causes an increase in sacroiliac joint mobility due to the hormone relaxin. This increased laxity is necessary for the widening of the birth canal during delivery. Decreased mobility is not a typical physiological finding in pregnancy-related back pain.

C. Increased thoracic kyphosis due to breast enlargement: While breast enlargement can slightly alter upper body posture, it does not typically cause the primary lower back discomfort reported by the patient. Kyphosis affects the upper back (hunchback appearance), whereas the patient's symptoms are localized to the lower back.

D. Muscle atrophy of the paraspinal muscles from reduced activity: Most pregnant women experience muscle strain from the increased load rather than atrophy. While activity may be reduced, the body must work harder to support the extra weight. Atrophy would involve a loss of muscle mass, which is not a standard finding in healthy pregnancy.