Gestational diabetes insipidus and intrauterine fetal death of monochorionic twins

Transient diabetes insipidus with severe maternal and fetal hypernatremia

Diabetes insipidus is a condition characterised by polyuria and polydipsia with excretion of diluted urine. Transient diabetes insipidus has been reported in pregnancy and is often associated with acute fatty liver of pregnancy, pre-eclampsia, HELLP syndrome and multiple pregnancy. Presenting symptoms can be vague. In our case, a primigravida with spontaneous monochorionic diamniotic twin pregnancy presented at 36+3 weeks in early labour. Severe hypernatremia was found in the patient and in both twins after a caesarean section was performed. Transient diabetes insipidus was diagnosed based on paired serum and urine osmolality. The hypernatremia was corrected gradually and 1-deamino-8D-arginine vasopressin was given. A high index of suspicion and early involvement of physicians and paediatricians are needed to avoid catastrophic consequences.

Maternal rhabdomyolysis and twin fetal death associated with gestational diabetes insipidus

BACKGROUND

Gestational diabetes insipidus is a rare, transient complication of pregnancy typically characterized by polyuria and polydipsia that may lead to mild electrolyte abnormalities. More severe sequelae of gestational diabetes insipidus are uncommon.

CASE

We present a case of a 25-year-old woman at 23 weeks of gestation in a dichorionic-diamniotic twin pregnancy who developed severe symptomatic gestational diabetes insipidus complicated by rhabdomyolysis and death of both fetuses.

CONCLUSION

Maternal rhabdomyolysis caused by gestational diabetes insipidus is extremely rare. Early recognition and treatment of gestational diabetes insipidus is necessary to prevent maternal and fetal morbidity and mortality.

Pregnancy-associated polyuria in familial renal glycosuria

A pregnant woman presented at gestational week 28 with loss of consciousness and profound polyuria. Further characterization revealed osmotic diuresis due to massive glycosuria without hyperglycemia. Glycosuria reduced substantially postpartum, from approximately 100 to approximately 30 g/1.73 m2 per day. DNA sequencing analysis of the SLC5A2 gene encoding the renal glucose transporter SGLT2 showed a homozygous frame-shift mutation (occurring after the glutamine at amino acid 168 and leading to premature termination of the protein at amino acid 186) diagnostic of familial renal glycosuria. Pregnant women with familial renal glycosuria can be at risk of profound polyuria during pregnancy due to the associated increase in glycosuria. These findings also have implications for the use of SGLT2 inhibitors in clinical practice.