Hyperparathyroidism during pregnancy and the effect of rising calcium on pregnancy loss: a call for earlier intervention
- 10 June 2009
- journal article
- Published by Wiley in Clinical Endocrinology
- Vol. 71 (1), 104-109
- https://doi.org/10.1111/j.1365-2265.2008.03495.x
Abstract
Introduction Hyperparathyroidism (HPT) during pregnancy is rare but poses a significant danger to mother and baby yet the incidence of pregnancy loss and its relationship to the degree of calcium elevation is not known. Design A retrospective patient series from a single practice examined the past and current obstetrical histories of pregnant patients with primary HPT. Results Over a period of 6-years, 32 women age ranging from 19 to 40 years had a total of 77 pregnancies while having elevated serum calcium levels because of primary HPT (incidence 0·7% of all women with primary HPT). Fifteen patients underwent parathyroidectomy during the second trimester resulting in an uneventful delivery of a healthy infant between 36 and 40 weeks gestation. There were no maternal or infant complications at surgery or during the subsequent delivery. Thirty of the remaining 62 pregnancies (48%) were lost, a rate that is 3·5-fold higher than expected (P < 0·05). In those who did not have the HPT addressed after the first miscarriage, one-third lost one or more additional pregnancies. Pregnancy loss occurred typically in the late first or early second trimester, with second trimester losses (30%) being sixfold higher than expected (P < 0·01) and over 4 weeks later than typical (P < 0·05). Foetal loss was seen at all levels of elevated maternal calcium but most were above 11·4 mg/dl (2·85 mmol/l). The rate of foetal loss increased directly with increasing maternal serum calcium levels (R = 0·972). Conclusions HPT during pregnancy is under recognized and is associated with a 3·5-fold increase in miscarriage rates. Pregnancy loss often occurs in the second trimester and is associated with multiple miscarriages when not addressed. Pregnancy loss is more common as calcium levels exceed 11·4 mg/dl (2·85 mmol/l), but can be seen at all elevated calcium levels. Emphasis is placed on earlier recognition and surgical cure before becoming pregnant, however, once pregnant, surgery should be offered early in the second trimester for those with calcium levels above 11·4 mg/dl.Keywords
This publication has 28 references indexed in Scilit:
- Hyperparathyroidism in Patients Over 80: Clinical Characteristics and Their Ability to Undergo Outpatient ParathyroidectomyThyroid®, 2007
- Maternal primary hyperparathyroidism: Discordant outcomes in a twin pregnancyJournal of Paediatrics and Child Health, 2006
- Primary hyperparathyroidism in pregnancyThe Journal of Laryngology & Otology, 2004
- NEONATAL SEIZURES DUE TO MATERNAL PRIMARY HYPERPARATHYROIDISMJournal of Paediatrics and Child Health, 2004
- Primary hyperparathyroidism, hypercalcemic crisis and subsequent seizures occurring during pregnancy: a case reportThe Journal of Maternal-Fetal & Neonatal Medicine, 2002
- Primary Hyperparathyroidism in Pregnancy:Evidence-Based ManagementObstetrical & Gynecological Survey, 2002
- Surgical treatment of primary hyperparathyroidism during the third trimesterObstetrics & Gynecology, 2002
- Primary hyperparathyroidism and acute pancreatitis during the third trimester of pregnancyThe Journal of Maternal-Fetal & Neonatal Medicine, 2001
- Incidence of Early Loss of PregnancyThe New England Journal of Medicine, 1988