A 24-year-old primigravid woman at 8 weeks' gestation is brought to the emergency department because of a 5-day history of nausea and vomiting. She has not been able to eat or drink much. Her symptoms are worse in the morning. She has tried multiple oral antiemetics with limited relief. She has not had fevers, chills, abdominal pain, urinary symptoms, or diarrhea. She appears tired. Her temperature is 37°C (98.6°F), pulse is 105/min, and blood pressure is 108/60 mm Hg. Cardiac examination reveals tachycardia but no murmurs or gallops. The abdomen is soft, nontender, and nondistended. Arterial blood gas analysis is most likely to reveal which of the following sets of values?

Question

A 24-year-old primigravid woman at 8 weeks' gestation is brought to the emergency department because of a 5-day history of nausea and vomiting. She has not been able to eat or drink much. Her symptoms are worse in the morning. She has tried multiple oral antiemetics with limited relief. She has not had fevers, chills, abdominal pain, urinary symptoms, or diarrhea. She appears tired. Her temperature is 37°C (98.6°F), pulse is 105/min, and blood pressure is 108/60 mm Hg. Cardiac examination reveals tachycardia but no murmurs or gallops.  The abdomen is soft, nontender, and nondistended.  Arterial blood gas analysis is most likely to reveal which of the following sets of values?

Quizplus · Accepted Answer

Eductional Objective: Severe vomiting leads to metabolic alkalosis through multiple mechanisms, including loss of H+ from the gastrointestinal tract, volume and Cl- depletion that induces renal retention of HCO₃-, and hypokalemia-induced intracellular shifting of H+.

A 24-Year-Old Primigravid Woman at 8 Weeks' Gestation Is Brought