1. Delayed Hyponatremia Following Surgery for Pituitary Adenomas: An Under-recognized Complication
- Author
-
Lakshmanan Jeyaseelan, Vedantam Rajshekhar, and Simon Rajaratnam
- Subjects
Male ,Time Factors ,Sodium Chloride ,Severity of Illness Index ,Gastroenterology ,Neurosurgical Procedures ,030218 nuclear medicine & medical imaging ,Lethargy ,Postoperative Complications ,0302 clinical medicine ,Risk Factors ,Medicine ,Intraoperative Complications ,Cerebrospinal Fluid Leak ,Middle Aged ,Neurology ,Vomiting ,Female ,medicine.symptom ,Hyponatremia ,Adenoma ,Adult ,medicine.medical_specialty ,Adolescent ,Sphenoid Sinus ,Asymptomatic ,Young Adult ,03 medical and health sciences ,Sex Factors ,Seizures ,Pituitary adenoma ,Internal medicine ,Humans ,Pituitary Neoplasms ,Aged ,Retrospective Studies ,Saline Solution, Hypertonic ,business.industry ,nutritional and metabolic diseases ,Retrospective cohort study ,medicine.disease ,Asymptomatic Diseases ,Diabetes insipidus ,Fluid Therapy ,Neurology (clinical) ,business ,Complication ,030217 neurology & neurosurgery - Abstract
Delayed hyponatremia is a serious complication seen after pituitary surgery. We document the incidence, presentation, outcome and risk factors for this condition.This was a retrospective study involving 222 patients operated for nonfunctioning pituitary macroadenomas between 2007-2016. Delayed hyponatremia was defined as serum sodium135 mmol/L, occurring after the third post-operative day. Hyponatremia was categorized as mild (134-130 mmol/L), moderate (129-125 mmol/L) and severe (125 mmol/L). All patients received intravenous (0.9%) saline, intravenous hydrocortisone and 12g oral salt over 24 hours. Patients with severe hyponatremia were given 3% saline.Fifty eight patients (26%) developed delayed hyponatremia; thirty (13.5%) had severe hyponatremia. Delayed hyponatremia usually (43.1%) occurred on the seventh post-operative day (range, 3-15 days). Most patients (81%) remained asymptomatic; 11 patients developed vomiting (5), seizures (3), lethargy (1), fever (1) and paralytic ileus (1). One patient developed status epilepticus. Patients who manifest symptoms had lower sodium levels as compared to those who did not have symptoms (mean 117.7 mmol/L vs. 123 mmol/L; P0.01). Male gender (P = 0.002) and intra-operative CSF leak (P = 0.003) were risk factors for developing delayed hyponatremia. Other factors like, age, pre-operative cortisol levels, extent of resection and post-operative diabetes insipidus did not correlate with the occurrence of delayed hyponatremia. Patients who maintained their mean serum sodium levels138 mmol/L (day 1-day 3) were unlikely to develop delayed hyponatremia (sensitivity, 55.2% and specificity, 83.9%), positive predictive value, 63.2% [confidence interval (CI) 48, 76.7%] and negative predictive value, 78.8% (CI 70.6, 85.5%). In most patients (57%) hyponatremia was corrected within 48 hours (h).We recommend routine serum sodium testing on the seventh post-operative day for all patients undergoing pituitary surgery. Most patients remain asymptomatic and unless they are detected early they can go on to develop serious complications.
- Published
- 2020
- Full Text
- View/download PDF