In the experience related by Olarra et al, 0.3% of the obstetric patients were admitted to the ICU. This rate of ICU admission is similar to the rate reported in the literature. The authors mentioned some differences between their findings and ours.1We are not surprised by these differences, because variations are likely to exist between our hospital and theirs with regard to patient mix, ICU admission criteria, and hospital settings. Similar to the observation by Olarra et al, others have reported hypertensive diseases of pregnancy to be the most common reason for ICU admission.2–3 Like the study by Lapinsky et al,4 respiratory failure and hemodynamic instability were responsible for ICU admission of 80% of the patients in our study.1 Eclampsia, preeclampsia, the syndrome of hemolytic anemia, elevated liver enzymes, and low platelet count (HELLP) were present in 33 of our patients.1 Although these 33 patients may have had coexistent hypertension, that condition was the reason for ICU admission in only 5 patients. Our obstetric unit has equipment and staff to provide care to noncomplicated cases of hypertension without ICU admission, explaining this observation. Although there was no significant difference in the incidence of pulmonary edema between patients who did and did not undergo emergent cesarean section, pulmonary edema was the most common reason for ICU admission in our study.1 A large, earlier study had also shown that pulmonary edema is a common occurrence in obstetric patients admitted to ICU.5 We are surprised by the absence of any case of pulmonary edema in the study by Olarra et al.