Incidence, clinical characteristics, and timing of objectively diagnosed venous thromboembolism during pregnancy

Venous malformation of the foot: Spontaneous regression postpartum on MRI

Venous malformations (VMs) are present at birth, grow proportionally during childhood, and usually do not regress. We report the imaging appearance of a VM of the foot found during pregnancy, which regressed spontaneously postpartum. A 35-year-old, 8-month-pregnant woman presented with a 6-month history of painful swelling of the left foot. MRI demonstrated a well-defined, intricate-shaped mass measuring 38 × 36 × 28 mm between the muscles and tendons of the third, fourth, and fifth toes with subcutaneous extension. Dynamic CT taken a month after delivery revealed gradual enhancement of the lesion. Gray-scale ultrasonography (US) showed a heterogenic hypoechoic mass containing thrombi with venous waveforms on Doppler US. A second MRI obtained 15 months after delivery showed a remarkable reduction of the lesion size (16 × 20 × 15 mm). Symptomatic VMs found during pregnancy can be observed conservatively without treatment.

Tranexamic acid for cesarean section: a double-blind, placebo-controlled, randomized clinical trial

PURPOSE

To assess the efficacy and safety of an intravenous formulation of tranexamic acid to reduce intrapartum and postpartum bleeding in patients giving birth by cesarean section.

METHODS

Healthy women with normal pregnancies, at any gestational age, that we performed ceaserean section. Two hundred and twenty-three patients with cesarean section, were enrolled in a double-blind, placebo-controlled study. Tranexamic acid of 20 cc and a 20 cc 5 % dextrose solution was intravenously injected to the patients; both the study group (n = 101) and the control group (n = 122) 10 min before the start of cesarean section. We measured volume of blood loss in postoperative periods, decrease in hemoglobin and hematocrit levels after cesarean section. The mean follow up was 2 weeks after the operation.

RESULTS

Tranexamic acid reduced intraoperative and postoperative blood loss. We did not observe any complications caused by TA such as venous thromboembolism, gastrointestinal problems and hypersensitivity.

CONCLUSIONS

This study confirms that tranexamic acid is effective in reducing intrapartum and postpartum bleeding in patients giving birth by cesarean section. Although some obstetricians are still worried about its thrombosis risk, our study shows that it can be used safely in aforementioned patients.

Dose reduction in computed tomographic angiography of pregnant patients with suspected acute pulmonary embolism

PURPOSE

The aim of this study was to quantify the effect of a reduced-dose pulmonary computed tomographic (CT) angiography protocol on radiation dose and image quality in pregnant patients as compared with a standard protocol.

MATERIALS AND METHODS

Twenty-six pregnant women with suspected pulmonary embolism underwent reduced-dose CT angiography (200 mA and 100 kV, from the aortic arch to the diaphragm). The matched control group standard protocol was 400 mA, 120 kilovolt (peak), and the entire thorax. The CT dose index, dose-length product, effective dose, image quality, and signal-to-noise ratio were assessed and compared with the Wilcoxon rank sum test result.

RESULTS

The CT dose index, mean dose-length product, and calculated effective dose were lower in the pregnancy group than in the controls: mean (SD), 5.21 (1.54) mGy versus 20.86 (5.59) mGy; 105.65 (39.77) mGy cm versus 575.71 (154.86) mGy cm, and 1.79 (0.676) msv versus 9.787 (2.63) msv, respectively (P < 0.0001). Quality scores of segmental (P = 0.266) and subsegmental (P = 0.207) arteries and arterial attenuation (P = 0.443) were similar.

CONCLUSIONS

In pregnant patients with suspected pulmonary embolism, combined reduction of kilovoltage and milliampere-second settings and z-axis coverage results in a substantial reduction of radiation dose while maintaining diagnostic imaging quality.

Pregnancy-associated changes in the hemostatic system

Pregnancy, from implantation to parturition, presents unique and profound challenges to a women's hemostatic system. During pregnancy, potentially catastrophic bleeding can occur during implantation and endovascular trophoblast invasion of the maternal spiral arteries. The risk of hemorrhage reaches a peak during the third stage of labor when the placenta is shorn from the decidua basalis exposing 120 spiral arteries largely denuded of their smooth muscle, and thus, their ability to constrict in response to injury. These challenges are met by dramatic changes in the local uterine, and systemic hemostatic systems. The net effect of these changes is to increase the efficiency of clotting and to impair fibrinolysis. Unfortunately, they also lead to an increase in the prevalence of venous thromboembolism, which is otherwise uncommon in reproductive age women.