Postoperative Hyponatremia Research Articles

Influence of Enteral Nutrition on Postoperative Hyponatremia

Introduction: Postoperative hyponatremia is still not fully understood. Some of the explanations presented are based on dilutions with low-sodium fluids, the influence of anti-diuretic hormone, the desalination process, and the “sick cell syndrome” with re-distribution of sodium and increased cell membrane permeability, but the authors of these trials are still looking for further evidence. Purpose: To provide information on postoperative hyponatremia in combination with early postoperative enteral nutrition. Methods: S-sodium, s-potassium, and s-creatinine were analysed daily during a random double blind prospective trial in which 30 patients received Nutridrink® and 30 patients received a placebo (water) through a nasoduodenal tube from the day of the operation to the 4th postoperative day. The patients were mobilised from the 1st postoperative day and weighed every day on the same scales. Twenty-four hour urine was collected one day preoperatively, the day of the operation, and postoperatively on days 1 through 5 and the urinary creatinine was measured. Multivariate analysis of variance for 5-7 related means (MANOVA) was used in a combined design with nutrition and placebo as between-subject factors and combined with univariate F tests. Results: S-sodium values were significantly lower and s-potassium values significantly higher in the placebo group on postoperative days 2 and 3, although the two groups received the same amount of intravenous sodium, and the placebo group received significantly less potassium. Conclusions: The result indicates that early postoperative enteral nutrition ensures the energy supply to the cell (Na/K pump) in the postoperative period and prevents sodium being redistributed intracellularly during postoperative stress.

Post-operative hyponatraemia and elective arthroplasty surgery: A review of the incidence, contributing factors, treatment and outcomes following total hip arthroplasty (THA) and total knee arthroplasty (TKA) in a regional primary joint unit

Post-operative hyponatraemia and elective arthroplasty surgery: A review of the incidence, contributing factors, treatment and outcomes following total hip arthroplasty (THA) and total knee arthroplasty (TKA) in a regional primary joint unit

Delayed postoperative hyponatremia after transsphenoidal surgery: prevalence and associated factors

Transient delayed postoperative hyponatremia (DPH) after transsphenoidal surgery (TSS) is common and can have potentially devastating consequences. However, the true prevalence of transient symptomatic and asymptomatic DPH has not been studied in a large patient cohort with close and accurate follow-up. A retrospective analysis of a single-institution prospective database was conducted; all patients undergoing TSS for lesions involving the pituitary gland were followed up in a multidisciplinary neuroendocrine clinic, and demographic, imaging, and clinical data were prospectively collected. Patients were examined preoperatively and followed up postoperatively in a standardized fashion, and their postoperative sodium levels were measured at Weeks 1 and 2 postoperatively. Levels of hyponatremia were rated as mild (serum sodium concentration 130-134 mEq/L), moderate (125-129 mEq/L), or severe (< 125 mEq/L). Routine clinical questionnaires were administered at all postoperative office visits. Postoperative hyponatremia was analyzed for correlations with demographic and clinical features and with immediate postoperative physiological characteristics. Over a 4-year interval, 373 procedures were performed in 339 patients who underwent TSS for sellar and parasellar lesions involving the pituitary gland. The mean (± SD) age of patients was 48 ± 18 years; 61.3% of the patients were female and 46.1% were obese (defined as a body mass index [BMI] ≥ 30). The overall prevalence of DPH within the first 30 days postoperatively was 15.0%; 7.2% of the patients had mild, 3.8% moderate, and 3.8% severe hyponatremia. The incidence of symptomatic hyponatremia requiring hospitalization was 6.4%. The Fisher exact test detected a statistically significant association of DPH with female sex (p = 0.027) and a low BMI (p = 0.001). Spearman rank correlation detected a statistically significant association between BMI and nadir serum sodium concentration (r = 0.158, p = 0.002) and an inverse association for age (r = -0.113, p = 0.031). Multivariate analyses revealed a positive correlation between postoperative hyponatremia and a low BMI and a trend toward association with age; there were no associations between other preoperative demographic or perioperative risk factors, including immediate postoperative alterations in serum sodium concentration. Patients were treated with standardized protocols for hyponatremia, and DPH was not associated with permanent morbidity or mortality. Delayed postoperative hyponatremia was a common result of TSS; a low BMI was the only clear predictor of which patients will develop DPH. Alterations in immediate postoperative sodium levels did not predict DPH. Therefore, an appropriate index of suspicion and close postoperative monitoring of serum sodium concentration should be maintained for these patients, and an appropriate treatment should be undertaken when hyponatremia is identified.

Factors predicting postoperative hyponatremia and efficacy of hyponatremia management strategies after more than 1000 pituitary operations

Syndrome of inappropriate antidiuretic hormone secretion-induced hyponatremia is a common morbidity after pituitary surgery that can be profoundly symptomatic and cause costly readmissions. The authors calculated the frequency of postoperative hyponatremia after 1045 consecutive operations and determined the efficacy of interventions correcting hyponatremia. The authors performed a retrospective review of 1045 consecutive pituitary surgeries in the first 946 patients treated since forming a dedicated pituitary center 5 years ago. Patients underwent preoperative and daily inpatient sodium checks, with outpatient checks as needed. Thirty-two patients presented with hyponatremia; 41% of these patients were symptomatic. Postoperative hyponatremia occurred after 165 operations (16%) a mean of 4 days after surgery (range 0-28 days); 19% of operations leading to postoperative hyponatremia were associated with postoperative symptoms (38% involved dizziness and 29% involved nausea/vomiting) and 15% involved readmission for a mean of 5 days (range 1-20 days). In a multivariate analysis including lesion size, age, sex, number of prior pituitary surgeries, surgical approach, pathology, lesion location, and preoperative hypopituitarism, only preoperative hypopituitarism predicted postoperative hyponatremia (p = 0.006). Of patients with preoperative hyponatremia, 59% underwent medical correction preoperatively and 56% had persistent postoperative hyponatremia. The mean correction rates were 0.4 mEq/L/hr (no treatment; n = 112), 0.5 mEq/L/hr (free water restriction; n = 24), 0.7 mEq/L/hr (salt tablets; n = 14), 0.3 mEq/L/hr (3% saline; n = 20), 0.7 mEq/L/hr (intravenous vasopressin receptor antagonist Vaprisol; n = 22), and 1.2 mEq/L/hr (oral vasopressin receptor antagonist tolvaptan; n = 9) (p = 0.002, ANOVA). While some patients received more than 1 treatment, correction rates were only recorded when a treatment was given alone. After 1045 pituitary operations, postoperative hyponatremia was associated exclusively with preoperative hypopituitarism and was most efficiently managed with oral tolvaptan, with several interventions insignificantly different from no treatment. Promptly identifying hyponatremia in high-risk patients and management with agents like tolvaptan can improve safety and decrease readmission. For readmitted patients with severely symptomatic hyponatremia, the intravenous vasopressin receptor antagonist Vaprisol is another treatment option.

Ecstacy-associated hyponatremia: why are women at risk?

Hyponatremia, serum sodium <135 mEq/L, is the most common electrolyte abnormality affecting ∼30% of hospitalized patients [1]. An infrequent yet serious complication of hyponatremia is hyponatremic encephalopathy. Hyponatremia can result in an influx of water to the intracellular space. This results in cellular swelling that can lead to cerebral edema and encephalopathy. Patients at highest risk of developing hyponatremic encephalopathy in the hospital setting are postoperative patients and patients with SIADH receiving hypotonic fluids [2]. Hyponatremic encephalopathy in the outpatient setting is usually seen as a complication due to medications such as thiazide diuretics or SSRIs, or can result from exerciseassociated hyponatremia or psychogenic polydypsia [3]. A significant risk factor for developing hyponatremic encephalopathy is female gender, with the majority of cases of death or permanent neurological injury from hyponatremic encephalopathy reported in females [4]. An increasingly common cause of hyponatremic encephalopathy in the outpatient setting is use of the recreational drug ecstasy (3,4-methylenedioxymethamphetamine [MDMA]) [5]. In this issue of NDT, van Dijken et al. [6] report on the high incidence of hyponatremia in females using ecstasy. Ecstasy is an illegal synthetic amphetamine that was initially developed as an appetite suppressant but never used for this purpose. It first emerged as a recreational drug in the 1980s popular with young adults at night club parties referred to as ‘rave parties’ [7]. A rave is typically a commercially arranged elaborate all-night dance party that combines electronic music played by disc jockeys with a laser light show. Rave parties are extremely popular in North America and Europe, with thousands of people in attendance at rave events. An annual New Year’s Eve rave party in Los Angeles is reported to have almost 50 000 attendants [8]. Ecstasy is frequently taken on such occasions for its mood-enhancement properties. Users experience feelings such as euphoria, increased empathy and sociability, happiness and a sense of well-being, and increased energy [9]. Ecstasy exerts its effect by the release of neuroactive compounds in the central nervous system, including serotonin, dopamine and norepinephrine [10]. With the rise in popularity of ecstasy, medical complications began to be reported including hyponatremia, non-traumatic rhabdomyolysis, seizures, acute kidney injury, hyperthermia, cardiac tachyarrhythmia and sudden death, to name a few [5, 11, 12]. Ecstasy is believed to be the third most commonly used illicit drug, following marijuana and amphetamines, and ahead of cocaine, with an estimated consumption of over 28 million tablets yearly [7]. Emergency medical services are frequently on site at large, commercially organized rave parties [8]. One of the most serious medical complications associated with ecstasy use is hyponatremic encephalopathy [11]. There are over 25 reports of ecstasy-associated hyponatremic encephalopathy in the literature, and over half of them are fatalities. Almost all cases are reported in young females between the ages of 15 and 30 with a serum sodium of ≤130 following the ingestion of just one dose of ecstasy [5]. Symptoms typically develop within 2–12 h of ecstasy ingestion. Presenting symptoms are headache, nausea and vomiting followed by altered mental status, coma, seizure, cardio respiratory arrest, brainstem herniation and death [5]. A common yet frequently unrecognized presenting feature in these patients is neurogenic pulmonary edema, also referred to as Ayus–Arieff syndrome (Figure 1). This complication was first reported in females with post-operative and exercise-associated hyponatremia [11, 13, 14]. This is a particularly dangerous complication as hypoxia impairs brain IN F O C U S

A 5-Year-Old With a History of “Feeling Walls” and Nocturia for Resection of a Suprasellar Tumor

OPEN ACCESSMay 7, 2013A 5-Year-Old With a History of “Feeling Walls” and Nocturia for Resection of a Suprasellar Tumor Kirk Lalwani, MD, Brook L. Nightwalker, MD Kirk Lalwani, MD Oregon Health & Science University School of Medicine Google Scholar More articles by this author , Brook L. Nightwalker, MD Oregon Health & Science University School of Medicine Google Scholar More articles by this author https://doi.org/10.15766/mep_2374-8265.9411 SectionsAbout ToolsDownload Citations ShareFacebookTwitterEmail AbstractAbstract Introduction: This narrative problem-based learning module is designed to facilitate group discussion with the integration of clinical knowledge and self-directed learning. It addresses a complex situation involving a child with a suprasellar mass requiring imaging and surgical resection. It also addresses the issue of delayed emergence following neurosurgery, as well as the differential diagnosis of postoperative hyponatremia, which is common in these settings and often presents a diagnostic dilemma. Methods: After a case presentation, the instructor guides the group through a series of questions, each of which promotes discussion and reviews the available data on the subject. The module is formatted as one 2-hour session, but it can also be implemented as two 1-hour sessions, depending on time available. The module was developed based on the authors' personal experience with a similar situation and a subsequent literature search on the issues covered in the module. Selected references were added to the bibliography to enhance the learner experience and highlight current evidence to support the management options presented in the discussion. Results: This module was developed for use at the 2006 and 2008 American Society of Anesthesiologists Annual Meetings and was presented twice to learners (residents, anesthesiology faculty in academic practices, and private practice anesthesiologists) at each meeting. It was also utilized with pediatric anesthesiology fellows at the primary author's institution. The module received positive feedback from both conference attendees and pediatric anesthesiology fellows. Discussion: The module can easily be incorporated into a residency, fellowship, or CME curriculum. Although the module features a pediatric patient, many adult providers care for teenage patients and would be able to actively participate in the discussion and be engaged with the clinical issues. Educational Objectives By the end of this module, learners will be able to: Discuss the safe conduct of sedation for MRI in a pediatric patient with a brain tumor.Review the pathophysiology and clinical presentation of suprasellar tumors.Discuss the preoperative considerations for resection of a craniopharyngioma in a child.Discuss the differential diagnosis of delayed emergence following the resection of a craniopharyngioma.Discuss the diagnosis and management of postoperative hyponatremia in neurosurgical patients. Sign up for the latest publications from MedEdPORTAL Add your email below FILES INCLUDEDReferencesRelatedDetails FILES INCLUDED Included in this publication: Case Stem with Model Discussion.docx Case Stem with Questions.docx Instructor's Guide.docx To view all publication components, extract (i.e., unzip) them from the downloaded .zip file. Download editor’s noteThis publication may contain technology or a display format that is no longer in use. Copyright & Permissions© 2013 Lalwani and Nightwalker. This is an open-access publication distributed under the terms of the Creative Commons Attribution-NonCommercial-Share Alike license.KeywordsCerebral Salt Wasting SyndromeCraniopharyngiomaHyponatremiaSedationDiabetes InsipidusComplicationsAnesthesiaMRIMagnetic Resonance Imaging Disclosures None to report. Funding/Support None to report. Prior Presentations A 5-Year Old Girl With a History of Feeling Walls and Nocturia. Problem-based learning discussion at: American Society of Anesthesiology Annual Scientific Meeting; 2006; Chicago, Illinois. A 5-Year Old Girl With a History of Feeling Walls and Nocturia for Resection of a Craniopharyngioma. Problem-based learning discussion at: American Society of Anesthesiology Annual Scientific Meeting; October 2008; Orlando, Florida. Loading ...

Postoperative Hyponatremia Predicts an Increase in Mortality and In-Hospital Complications after Cardiac Surgery

The association between postoperative hyponatremia (Na < 135 mEq/L) and outcomes after cardiac surgery has not been established. We studied the prevalence of postoperative hyponatremia and its effects on outcomes after cardiac surgery. We studied 4,850 patients who underwent cardiac surgery from 2002 to 2008. We used multivariable logistic and Cox regression analysis to study the association between postoperative hyponatremia and mortality, length of hospital stay (LOS), and complications. Postoperative hyponatremia was present in 59%. Hyponatremic patients were older (mean ± SD, 62 ± 13 vs 61 ± 14 years, p= 0.001), had lower left ventricle ejection fraction (mean ± SD, 44% ± 16% vs 48% ± 13%, p < 0.001), higher mean pulmonary artery pressures (mean ± SD, 30 ± 11 vs 27 ± 9 mmHg, p < 0.001), lower glomerular filtration rate (mean ± SD, 72 ± 29 vs 74± 27 mg/min/1.73 m(2), p= 0.01), higher EuroSCORE (median, 15% vs 6%, p < 0.001), higher New York Heart Association class IV (31% vs 26%, p= 0.002), prevalence of COPD (23% vs 14%, p < 0.001), and peripheral vascular disease (16% vs 12%, p < 0.001). Hyponatremia increased overall (24% vs 18.2%, p<0.001) and late mortality (18.6% vs 13.9%, p<0.001) and length of stay (LOS; 11 vs 7 days, p < 0.001). Mortality increased with the severity of the hyponatremia. After adjusting for baseline and procedure variables, postoperative hyponatremia was associated with increase in mortality (hazard ratio 1.22, 95% CI 1.06-1.4, p= 0.004), LOS (multiplier 1.34, 95% CI 1.22-1.49, p < 0.001), infectious (odds ratio [OR] 2.32, 95% CI 1.48-3.62, p < 0.001), pulmonary (OR 1.82, 95% CI 1.49-2.21, p < 0.001), and renal failure complications (OR 2.46, 95% CI 1.58-3.81, p< 0.001) and need for dialysis (OR 3.66, 95% CI 1.72-7.79, p= 0.001). Hyponatremia is common after cardiac surgery and is an independent predictor of increased mortality, length of hospital stay, and postoperative complications.

Formal quality improvement curriculum and DMAIC method results in interdisciplinary collaboration and process improvement in renal transplant patients

BackgroundBroad-based formal quality improvement curriculum emphasizing Six Sigma and the DMAIC approach developed by our institution is required for physicians in training. DMAIC methods evaluated the common outcome of postoperative hyponatremia, thus resulting in collaboration to prevent hyponatremia in the renal transplant population. MethodsTo define postoperative hyponatremia in renal transplant recipients, a project charter outlined project aims. To measure postoperative hyponatremia, serum sodium at admission and immediately postoperative were recorded by retrospective review of renal transplant recipient charts from June 29, 2010 to December 31, 2011. An Ishikawa diagram was generated to analyze potential causative factors. Interdisciplinary collaboration and hospital policy assessment determined necessary improvements to prevent hyponatremia. Continuous monitoring in control phase was performed by establishing the goal of <10% of transplant recipients with abnormal serum sodium annually through quarterly reduction of hyponatremia by 30% to reach this goal. ResultsOf 54 transplant recipients, postoperative hyponatremia occurred in 92.6% of patients. These potential causes were evaluated: 1) Hemodialysis was more common than peritoneal dialysis. 2) Alemtuzumab induction was more common than antithymocyte globulin. 3) A primary diagnosis of diabetes existed in 16 patients (30%). 4) Strikingly, 51 patients received 0.45% sodium chloride intraoperatively, suggesting this as the most likely cause of postoperative hyponatremia. A hospital policy change to administer 0.9% sodium chloride during renal transplantation resulted in normal serum sodium levels postoperatively in 59 of 64 patients (92.2%). ConclusionThe DMAIC approach and formal quality curriculum for trainees addresses core competencies by providing a framework for problem solving, interdisciplinary collaboration, and process improvement.

Intraoperative and postoperative hyponatremia with craniosynostosis surgery

An alarming incidence of significant intraoperative hyponatremia during major pediatric craniofacial surgery has recently been reported, the mechanism of which is unclear. To establish the incidence and severity of hyponatremia occurring during and after major craniofacial surgery for craniosynostosis in our institution and identify any associated risk factors. Retrospective review of case notes and blood test results for all cases of major craniofacial surgery for craniosynostosis in children under 10 years of age from January 2007 to May 2011. Hyponatremia was classified as: mild 131-134 mmol·l(-1) ; moderate 126-130 mmol·l(-1) ; and, severe ≤125 mmol·l(-1) . Analyses were performed to look for factors associated with hyponatremia including gender, weight, syndromic or not, duration of procedure, and volumes of crystalloid, colloid and blood administered. One hundred and two consecutive cases were identified. Mild intraoperative hyponatremia occurred in five (5%) of children. There were no cases of moderate or severe intraoperative hyponatremia. All five had normal sodium values within two hours of their single low readings of 134 mmol.l(-1) and none had any subsequent episodes of hyponatremia in the postoperative period. Intraoperative hyponatremia was associated with lower body weight (P = 0.002). Mild postoperative hyponatremia on the day of surgery (POD0) occurred in three other children (3%) with no identifiable associations. There were no cases of moderate or severe postoperative hyponatremia on POD0. Hyponatremia on the first postoperative day (POD1) was mild in 23 children (24%) and moderate in one child (1%). There were no cases of severe postoperative hyponatremia on POD1. Hyponatraemia on POD1 was associated with male gender (P = 0.042). Clinically significant intraoperative hyponatremia was not a feature of major craniofacial surgery in our institution. Mild postoperative hyponatremia was relatively common on POD1.

Hypotonic Versus Isotonic Maintenance Fluids After Surgery for Children: A Randomized Controlled Trial

The objective of this randomized controlled trial was to evaluate the risk of hyponatremia following administration of a isotonic (0.9% saline) compared to a hypotonic (0.45% saline) parenteral maintenance solution (PMS) for 48 hours to postoperative pediatric patients. Surgical patients 6 months to 16 years of age with an expected postoperative stay of >24 hours were eligible. Patients with an uncorrected baseline plasma sodium level abnormality, hemodynamic instability, chronic diuretic use, previous enrollment, and those for whom either hypotonic PMS or isotonic PMS was considered contraindicated or necessary, were excluded. A fully blinded randomized controlled trial was performed. The primary outcome was acute hyponatremia. Secondary outcomes included severe hyponatremia, hypernatremia, adverse events attributable to acute plasma sodium level changes, and antidiuretic hormone levels. A total of 258 patients were enrolled and assigned randomly to receive hypotonic PMS (N = 130) or isotonic PMS (N = 128). Baseline characteristics were similar for the 2 groups. Hypotonic PMS significantly increased the risk of hyponatremia, compared with isotonic PMS (40.8% vs 22.7%; relative risk: 1.82 [95% confidence interval: 1.21-2.74]; P = .004). Admission to the pediatric critical care unit was not an independent risk factor for the development of hyponatremia. Isotonic PMS did not increase the risk of hypernatremia (relative risk: 1.30 [95% confidence interval: 0.30-5.59]; P = .722). Antidiuretic hormone levels and adverse events were not significantly different between the groups. Isotonic PMS is significantly safer than hypotonic PMS in protecting against acute postoperative hyponatremia in children.

The European Consensus Statement on intraoperative fluid therapy in children

This Invited Commentary accompanies the following article: over a decade for anaesthetists around the world to respond to the alert raised by Arieff et al. when 16 previously healthy children in the region had a respiratory arrest associated with post-operative hyponatraemia. Nine of these died and the rest were severely brain damaged. Children are still suffering the same fate for the same reason.

Cerebral Salt Wasting Syndrome in Post-Operative Pediatric Brain Tumor Patients

Cerebral salt wasting syndrome (CSWS) and the syndrome of inappropriate antidiuretic hormone (SIADH) are both causes of hyponatremia in pediatric neurosurgical patients often with similar presenting symptoms; however, despite similar clinical characteristics the treatment for CSWS and SIADH can be drastically different, which makes the distinction critical for post-operative treatment. Further complicating matters, are the exact mechanism for CSWS which remains unclear, and the incidence and severity of CSWS is not well studied in pediatric neurosurgical patients. We hypothesized that CSWS occurs frequently in post-operative brain tumor patients and is an important cause of post-operative hyponatremia in these patients. We designed a single institution retrospective cohort study of all pediatric brain tumor patients undergoing craniotomy for tumor resection at our institution between January 2005 and December 2009. Of the 282 patients undergoing 291 operations, post-operative CSWS was identified in 15 cases (5%), and was more frequently observed than SIADH (nine cases, 3%). Median onset of CSWS was on post-operative day 3, lasting a median of 2.5 days. Patients with CSWS were more likely to have suffered post-operative stroke (40 vs. 4.6%, P < 0.001), have chiasmatic/hypothalamic tumors (40 vs. 3.8%, P = 0.002), and be younger (mean age 5.9 vs. 9.7 years, P = 0.01) than eunatremic patients. In addition, nearly half of the patients with CSWS (47%) had post-operative hyponatremic seizures. The diagnosis of CSWS should be strongly considered in hyponatremic pediatric patients with significant natriuresis following brain tumor resection, and a treatment initiated promptly to prevent neurologic sequeleae.

The Impact of Anesthesia on Glycine Absorption in Operative Hysteroscopy

Operative hysteroscopy requires the use of a distension medium and its absorption can lead to serious consequences from intravascular volume overload and water intoxication. We compared the impact of 2 types of anesthesia (general anesthesia and local anesthesia with sedation) on the absorption of glycine solution in operative hysteroscopy. A randomized controlled trial was conducted over a 17-month period. Eligible patients undergoing operative hysteroscopy for abnormal uterine bleeding were randomized in 2 groups: a general anesthesia group and a local anesthesia with sedation group. The primary outcome was the median absorption of the glycine solution (10th-90th percentile) measured with an automated tandem canister system. Secondary outcomes included incidence of absorption >1000 mL, discontinued surgery because of excessive absorption, median change in serum sodium, postoperative hyponatremia, and patients' postoperative quality of life at 24 hours (8-item Short Form Health Survey questionnaire). Nonparametric analyses (Mann-Whitney U test, χ(2) test, and Fisher exact test) were used. Of 142 eligible patients, 95 agreed to participate and were randomized. Women who underwent general anesthesia had a higher median absorption of the glycine solution (10th-90th percentile) compared with women who underwent local anesthesia with sedation (480 mL [76-1300 mL] vs 253 mL [70-728 mL]; P = 0.005). General anesthesia was also associated with a higher rate of glycine solution absorption (>1000 mL [20% vs 4%; P = 0.009]) and a more rapid rate of decrease in serum sodium (≥10 mEq/L [8% vs 0%; P = 0.005]) than local anesthesia with sedation. Postoperative quality of life measures as rated by the patients were comparable between the 2 groups. Compared with general anesthesia, local anesthesia with sedation is associated with less glycine absorption and should be considered the preferred method of anesthesia for operative hysteroscopy.

Pituitary apoplexy following shoulder arthroplasty: a case report.

IntroductionPituitary apoplexy following a major surgical procedure is a catastrophic event and the diagnosis can be delayed in a previously asymptomatic patient. The decision on thromboprophylaxis in shoulder replacements in the absence of definite guidelines, rests on a careful clinical judgment.Case presentationA previously healthy 62-year-old Caucasian male patient who underwent shoulder arthroplasty developed hyponatremia resistant to correction with saline replacement. The patient had a positive family history of deep vein thrombosis and pulmonary embolism and heparin thromboprophylaxis was considered on clinical grounds. The patient developed hyponatremia resistant to conventional treatment and later developed ocular localizing signs with oculomotor nerve palsy. The diagnosis was delayed due to other confounding factors in the immediate post-operative period. Subsequent workup confirmed a pituitary adenoma with features of pituitary insufficiency. The patient was managed successfully on conservative lines with a multidisciplinary approach.ConclusionsA high index of suspicion is required in the presence of isolated post-operative hyponatremia resistant to medical correction. A central cause, in particular pituitary adenoma, should be suspected early. Thromboprophylaxis in shoulder replacements needs careful consideration as it may be a contributory factor in precipitating this life-threatening condition.

Seizure and mental status change after surgery for pelvic organ prolapse

The syndrome of inappropriate antidiuretic hormone secretion (SIADH) is a well-documented postoperative complication but infrequently seen after gynecologic procedures. Clinical presentation is often insidious, and neurologic sequelae may be severe, especially in women. We report the first published case of postoperative hyponatremia due to SIADH after vaginal reconstructive surgery. Our patient sustained a tonic-clonic seizure on postoperative day 2 in the setting of profound hyponatremia. Early detection and prompt treatment allowed her to achieve a complete recovery. Familiarity with uncommon complications of vaginal surgery is important. Prompt initiation of treatment can prevent potentially fatal consequences.

Perioperative seizure incidence and risk factors in 223 pediatric brain tumor patients without prior seizures

The incidence of, and risk factors for, perioperative seizures and the need for perioperative antiepileptic drugs (AEDs) in previously seizure-free children with brain tumors remains unclear. The authors have undertaken a review of previously seizure-free pediatric patients with brain tumors undergoing resection to identify the incidence of seizures in the perioperative period, and to characterize risk factors for perioperative seizures in this population. A retrospective review was conducted of all patients between 0 and 19 years of age without prior seizures who underwent intracranial tumor resection at the authors' institution between January 2005 and December 2009. Of the 223 patients undergoing 229 operations, 7.4% experienced at least 1 clinical seizure during the surgical admission. Over half of all tumors were supratentorial. Only 4.4% of patients received prophylactic AEDs. Independent factors associated with perioperative seizures included supratentorial tumor, age < 2 years, and hyponatremia due to syndrome of inappropriate antidiuretic hormone or cerebral salt wasting. Tumor type, lobe affected, operative blood loss, and length of surgery were not independently associated with seizure incidence. Perioperative seizures in previously seizure-free children undergoing resection of brain tumors are associated with supratentorial tumor location, age < 2 years, and postoperative hyponatremia. Perioperative seizures are not associated with tumor pathology, tumor size, or frontotemporal location. Due to the low incidence of seizures in this series in patients more than 2 years old with normal serum sodium, the authors recommend that pediatric patients with brain tumors not routinely receive perioperative prophylactic AEDs. However, the role for prophylaxis in patients younger than 2 years of age deserves further study.

Postoperative hyponatremia following calvarial vault remodeling in craniosynostosis

The incidence, severity, and risk factors for the development of hyponatremia in patients undergoing craniosynostosis surgery are not well known. To determine the incidence and severity of hyponatremia as a complication in surgical correction of craniosynostosis and to identify risk factors for postoperative hyponatremia. A retrospective medical record review for 2003-2008 of the Cleft and Craniofacial Database was made. Specific data collected included sodium values, age, weight, type of surgery, duration of surgery, administration of DDAVP, composition and volume of pre-operative, intra-operative, postoperative parenteral fluids, volume of blood, colloid, and crystalloid transfused, estimated blood loss (EBL), medications, comorbidities, pre-operative signs of elevated intracranial pressure (ICP), syndromic vs nonsyndromic craniosynostosis, and the complications associated with hyponatremia. A total of 72 records were reviewed. The incidence of postoperative hyponatremia was 30.6%. There was no intra-operative hyponatremia. While hospital stay was not prolonged, ICU stay was significantly longer (1.9 vs 2.9 days, P = 0.001). Elevated ICP was significantly associated with hyponatremia (P < 0.002). A greater volume of blood loss (EBL) was associated with postoperative hyponatremia (P = 0.019). Patients with normal pre-operative ICP were more likely to become hyponatremic if they were female (relative risk = 2.43; P < 0.05). The average decrease in sodium was greater in patients receiving hyponatremic (hypotonic) vs normonatremic (isotonic) postoperative IVF's (5.5 vs 3.2 mEq·l(-1), P = 0.039). There were no postoperative complications related to hyponatremia. The incidence of postoperative hyponatremia after calvarial vault remodeling was determined to be 30.6%. Hyponatremia was significantly associated with increased pre-operative ICP, blood loss, and female gender (normal pre-operative ICP). The average decrease in sodium was greater in patients receiving hyponatremic postoperative IVF's.

Minimally Invasive Percutaneous Ablation of Parapelvic Renal Cysts and Caliceal Diverticula Using Bipolar Energy

The use of bipolar electrocautery has proven advantages over monopolar energy during transurethral surgery by limiting hyponatremia and its clinical sequelae. Percutaneous ablation of caliceal diverticula and parapelvic renal cysts has been shown to be an effective surgical approach for the management of these conditions when clinically indicated. We present single center results of percutaneous ablation of renal cysts and caliceal diverticula using a bipolar energy technique and compare the results with a cohort of patients undergoing the procedure using monopolar energy. Between July 2006 and June 2010, 30 patients with caliceal diverticula and renal cysts underwent percutaneous ablation using the bipolar resection system with saline irrigation (group 1). This group was compared with a cohort of 19 patients who underwent traditional ablation using a standard resectoscope, monopolar energy, and glycine irrigation (group 2). We evaluated operative times, change in hematocrit and serum sodium levels from preoperative levels, complication rates, as well as symptomatic and radiographic success rates. The mean operative times were 87 minutes and 63 minutes for groups 1 and 2, respectively (P = 0.07). The mean percent decrease in hematocrit was 3.27 ± 1.93 in group 1 and 3.82 ± 2.09 in group 2 (P = 0.16), and the mean decrease in serum sodium level was -0.21 ± 2.24 mEq/L in group 1 and 3.78 ± 2.18 mEq/L in group 2 (P < 0.001). There were no intraoperative complications. One patient needed ureteral stent placement for persistent urine leak. All patients with symptomatic renal cysts reported resolution of their discomfort, with radiographic success confirmed in 89% in group 1 and 79% in group 2 (P = 0.41). Percutaneous ablation of caliceal diverticula and renal cysts using a bipolar resection system is feasible and appears to have efficacy similar to that of the monopolar system. In addition, use of isotonic saline as the irrigation medium appears to reduce the risk of postoperative hyponatremia.

Post-operative hyponatremia in patients with pituitary adenoma: post-operative management with a uniform treatment protocol

This study is a retrospective analysis of hyponatremia after transsphenoidal surgery in patients with pituitary adenoma. We evaluated (i) the incidence of post-operative hyponatremia (serum Na levels ≤ 135 mEq/L) and the emergence of hyponatremic symptoms, and assessed (ii) the risk factors under a uniform protocol of i.v. infusion with steroid and electrolyte fluid. We examined 88 consecutive operated patients (female: 60; male: 28) with pituitary adenoma. Apart from reconfirming the effects of the purported risk factors, we focused on the degree of serum Na decline on post-operative hyponatremia. Although remained stable during early post-operative period (4 days after surgery), the serum Na levels subsequently decreased after post-operative day 4 in 81 of 88 cases (92.0%). Of 88 patients, 27 (30.7%) and 9 (10.2%) cases suffered from hyponatremia, and developed hyponatremic symptoms. Interestingly, the degree of serum Na levels decline (from pre-operative levels) indicated a useful independent risk factor for monitoring hyponatremic symptoms (p = 0.006) and the degree of decline tended to be greater in elder patients (> 60 years) (p = 0.0346). Serum Na levels should be monitored from, at least, post-operative day 7 to detect early development of hyponatremia. Special attention and recovery effort should be given to elder patients with marked serum Na level decline after surgery.

The relationship between arginine vasopressin levels and hyponatremia following a percutaneous renal biopsy in children receiving hypotonic or isotonic intravenous fluids

Post-operative hyponatremia is a common complication in children which results from hypotonic fluid administration in the presence of arginine vasopressin (AVP) excess. We evaluated the relationship between the change in serum sodium and AVP levels following percutaneous renal biopsy in children receiving either hypotonic or isotonic fluids. This study was prompted after we encountered a patient who developed near-fatal hyponatremic encephalopathy following a renal biopsy while receiving hypotonic fluids. The relationship between the change in serum sodium and AVP levels was evaluated prior to (T0) and at 5 h (T5) following a percutaneous renal biopsy in 60 children receiving either hypotonic (0.6% NaCl, 90 mEq/L) or isotonic fluids (0.9% NaCl, 154 mEq/L). The proportion of patients with elevated AVP levels post-procedure was similar between those receiving 0.6 or 0.9% NaCl (30 vs. 26%). Patients receiving 0.6% NaCl with elevated AVP levels experienced a fall in serum sodium of 1.9 ± 1.5 mEq/L, whereas those receiving 0.9% NaCl had a rise in serum sodium of 0.85 ± 0.34 mEq/L with no patients developing hyponatremia. There were no significant changes in serum sodium levels in patients with normal AVP concentrations post-procedure in either group. In conclusion, elevated AVP levels were common among our patients following a percutaneous renal biopsy. Isotonic fluids prevented a fall in serum sodium and hyponatremia, while hypotonic fluids did not.