A client at term arrives at the labor room experiencing contractions every 4 minutes. After a brief assessment, she’s admitted and an electronic fetal monitor is applied. Which of the following would alert the nurse to an increased potential for fetal distress ？（）
A．Weight gain of 30 lb (13.6 kg).
B．Maternal age of 32 years.
C．Blood pressure of 146/90 mmHg.
D．Treatment for syphilis at 15 weeks’ gestation.
参考答案：C
解析：
Blood pressure of 146/90mmHg indicates pregnancy-induced hypertension (PIH). Over time, PIH reduces blood flow to the placenta; it can cause intrauterine growth retardation and other problems that make the fetus less able to tolerate the stress of labor. A weight gain of 30 lb is within the expected parameters for a healthy pregnancy. A woman over age 30 doesn’t have a greater risk of complications if her general condition is healthy before pregnancy. Syphilis that has been treated doesn’t pose an additional risk.