Evaluation and management of rectal bleeding in pregnancy

Thiopurine Metabolite Shunting in Late Pregnancy Increases the Risk of Intrahepatic Cholestasis of Pregnancy in Women With Inflammatory Bowel Disease, and Can be Managed With Split Dosing

BACKGROUND AND AIMS

The risk of intrahepatic cholestasis of pregnancy [ICP] is increased in thiopurine-exposed pregnancies. Thiopurine 'shunting', with a 6-methylmercaptopurine [MMP] to 6-thioguanine [TGN] ratio of >11, progresses over pregnancy, and may promote ICP development. We aimed to explore the association between thiopurine exposure and ICP, including the hypothesised impact of thiopurine shunting, and identify risk minimisation strategies.

METHODS

This prospective multicentre cohort study compared thiopurine and biologic monotherapy-exposed pregnant participants. Disease activity and obstetric outcome data, thiopurine metabolites, bile acids, and transaminases were obtained before conception, in each trimester, at delivery, and postpartum. Thiopurine dose management was at the discretion of the treating physician.

RESULTS

Included were 131 thiopurine and 147 biologic monotherapy-exposed pregnancies. MMP/TGN ratio increased from preconception to third trimester [p <0.01], with approximately 25% of participants shunting in pregnancy. Second trimester split dosing led to a decrease in the median MMP/TGN ratio from 18 (interquartile range [IQR] 6-57) to 3 [IQR 2-3.5] at delivery [p = 0.04]. The risk of ICP was increased in thiopurine-exposed pregnancies (6.7% [7/105] vs 0% [0/112], p <0.001), with all ICP cases occurring in the setting of antenatal thiopurine shunting. Thiopurine dose increases (risk ratio [RR] 8.10, 95% confidence interval [CI] 1.88-34.85, p = 0.005) and shunting in third trimester [6.20, 1.21-30.73, p = 0.028] and at delivery [14.18, 1.62-123.9, p = 0.016] were associated with an increased risk of ICP.

CONCLUSIONS

Thiopurine exposure is associated with an increased risk of ICP, particularly following dose increases antenatally and with shunting in late pregnancy. The latter may be effectively managed with split dosing, although further studies are warranted.

Investigating gastrointestinal disorders in pregnancy

This article reviews anatomical and physiological changes and alterations in reference intervals for laboratory tests in healthy pregnancy, pertinent to investigation of the gastrointestinal system. The safety of procedures and radiological investigations relevant to the investigation of gastrointestinal disorders in pregnancy are also reviewed.

Haemorrhoids and Anal Fissures in Pregnancy: Predictive Factors and Effective Treatments

Introduction Haemorrhoids and anal fissures (HAF) are common in pregnancy and can severely affect the quality of life of those suffering from them. Despite the condition being common, there is limited evidence, formal guidelines or recommendations on treatment, and little is known about the natural course during pregnancy. Methods This was a prospective, observational cohort study conducted at a tertiary-referral university maternity hospital (The National Maternity Hospital, Dublin), conducted over a nine-month period. The first part of the study was a case-control study of antenatal patients over 34 weeks' gestation. The second part of the study involved a cohort of postnatal patients. Anonymous patient surveys were performed and analysed. Results Two hundred and fifty-eight patients were recruited into the study from the outpatient clinics and wards of one maternity hospital from April to December 2021. Of the antenatal patients, 82/184 (45%) of these patients had symptoms of HAF and 102/184 (55%) antenatal patients were unaffected, acting as controls. In addition, 74 affected postnatal patients were also included. In the affected antenatal group, 36/82 (44%) of patients had self-reported HAF (symptoms or signs of HAF); 50/82 (61%) of patients diagnosed with HAF on their own. 12/82 (15%) noticed symptoms in the first trimester, 25/82 (30%) in the second and 45/82 (55%) in the third. 142/184 (77%) of antenatal patients used conservative methods to manage their symptoms, including an increase in dietary fibre. 144/184 (78%) used medical treatments including suppositories. Only one patient had surgery. 70/156 (45%) of postnatal patients' symptoms resolved within days, 42/156 (27%) in weeks and 44/156 (28%) within months. Conclusion HAF affect almost half of the pregnancies. Age over 35 was significantly associated with antenatal haemorrhoids or anal fissures. Concerningly, the majority of patients (64%) self-diagnose and manage the condition without either seeking or receiving guidance from medical professionals. In terms of the natural course of the disease, it was encouraging that 45% of patients' symptoms resolved within a few days. This will help when counselling patients with distressing symptoms. Conservative measures such as increased dietary fibre, increased fluid intake and bath salts were effective in relieving symptoms for the majority of patients.