Letters to the Editor Utility of lung ultrasound assessment for probable SARS-CoV-2 infection during pregnancy and universal screening of asymptomatic individuals Pregnant women are a risk group for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection, which has been shown to be associated with increased rates of preterm delivery and Cesarean section 1. Despite reassuring safety profile, imaging modalities, such as computed tomography, are used scarcely in pregnancies with suspected SARS-CoV-2 infection due to concerns about undue exposure of the fetus to ionizing radiation. However, false-positive and false-negative results are not uncommon in reverse transcription polymerase chain reaction (RT-PCR) testing. Anecdotal reports suggest that the adjunct use of imaging modalities can help manage cases in which molecular testing results and the clinical presentation are conflicting 2. Furthermore, use of imaging modalities is suggested for the preoperative screening of emergency cases 3. Lung ultrasound (LUS) is an ionizing-radiation-free, reproducible imaging modality for evaluating lung lesions, and its results are readily available, well in advance of the RT-PCR results 4. However, the added benefit of LUS for managing symptomatic and asymptomatic patients with SARS-CoV-2 infection during pregnancy remains unclear. This was a retrospective cohort study conducted in two large SARS-CoV-2 pandemic hospitals in Turkey (

Objective To assess the impact of an estrogen replacement regimen on frozen embryo transfer (FET) cycle outcome. Methods In the present retrospective cohort study, data of infertile women undergoing FET with good‐quality embryos were reviewed. The first group received 2 mg of estradiol hemihydrate (EH) once daily for 6 to 7 days, then twice daily for 4 to 5 days, and then three times a day until embryo transfer. The second group received EH twice daily for 7 to 8 days, then three times a day. The third group received EH three times a day constantly. The main outcome measure was live birth rate. Results In total, 394 FET cycles were included. The fixed 6‐mg group required the highest estradiol hemihydrate dose. The duration of estrogen treatment was significantly longer in the first group. Maximal endometrial thickness was highest in the second group (10.2 ± 1.3 mm vs. 9.6 ± 1.4 mm vs. 8.6 ± 0.9 mm, respectively; P < 0.001). The clinical pregnancy rates in the groups were 41.1%, 55.2%, and 42.2%, respectively (P = 0.035). Live birth rates were 40.8%, 50.9%, and 48.1%, respectively (P = 0.320). Conclusion In FET cycles with hormone replacement therapy, a step‐up 4‐mg regimen provides thicker endometrium with optimal‐dose estrogen in an adequate time frame. The tendency for increased clinical pregnancy and live birth rates is remarkable.

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We have encountered a case of isolated fetal tachycardia that we could not detect specific pathology except COVID-19. Even if the patients are asymptomatic, it should be considered that the systemic changes of the disease may affect the fetus. If the cardiotocograph shows fetal tachycardia after clinicians optimize the maternal environment to rectify, it should be considered that COVID-19 may lead to transient and isolated fetal tachycardia. Therefore, it should be administered with careful fetal monitoring not only for tachycardia but also for fetal hypoxia and stress in COVID-19-positive asymptomatic pregnant women.

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