A nurse is reviewing the medical record for a client who is at 38 weeks of gestation, tested positive for group B streptococcus B-hemolytic, and is allergic to penicillin. The nurse should identify that which of the following medications is contraindicated for this client?

Placenta previa is a condition where the placenta partially or completely covers the opening of the cervix. One of the hallmark signs of placenta previa is painless vaginal bleeding, typically bright red in color. This bleeding can occur spontaneously or during activities that put pressure on the uterus, such as sexual intercourse or physical exertion.

A rigid abdomen is not typically associated with placenta previa. It may indicate other conditions, such as peritonitis or abdominal muscle rigidity, but it is not a characteristic finding of placenta previa.

Persistent uterine contractions are not typically associated with placenta previa. Placenta previa is more commonly associated with painless bleeding rather than contractions. However, if placenta previa is complicated by other factors, such as placental abruption, contractions and abdominal pain may be present.

Fetal movement is not directly related to placenta previa. Fetal movement can vary from person to person and does not specifically indicate placenta previa. However, it is important for the nurse to assess fetal well-being in clients with placenta previa as bleeding can impact the oxygen supply to the fetus.

Answer: A

Rationale:

A) Ampicillin: Ampicillin is contraindicated for this client because it belongs to the penicillin class of antibiotics. Since the client is allergic to penicillin, administering ampicillin could trigger an allergic reaction, which could range from mild rash to severe anaphylaxis.

B) Erythromycin: Erythromycin is a macrolide antibiotic and can be used as an alternative for clients who are allergic to penicillin. It is often prescribed for group B streptococcus infections in penicillin-allergic clients, making it a suitable option in this case.

C) Cefazolin: Cefazolin is a cephalosporin antibiotic and is generally considered safe for clients with a penicillin allergy, except in cases of severe penicillin allergies. Cross-reactivity is low, and cefazolin can be an appropriate choice for treating group B streptococcus.

D) Clindamycin: Clindamycin is a lincosamide antibiotic and is often used for clients with penicillin allergies. It is effective against group B streptococcus and does not belong to the penicillin or cephalosporin classes, making it a suitable option for this client.