Demographic variation of electrolyte imbalance in a tertiary care pediatric intensive care unit

Background: Electrolyte imbalances are common in critically ill paediatric patients. When present, they can significantly affect the outcome. Critical care provision through Paediatric Intensive Care Units (PICU) is aimed at maintaining 'homeostasis' in the body which is vital for the organ's support and optimal function. This involves fluids and electrolytes balance.Methods: This prospective observational study was conducted in the PICU, SCB MC and Hospital, Cuttack during November 2015 to October 2017. includes Children admitted to PICU (Based on consensus guidelines for PICUs in India, Indian Society of Critical Care Medicine (Pediatric Section) and Indian Academy of Pediatrics (Intensive Care Chapter).Results: Percentage of male children was 65.9%, with male to female ratio 1.9:1, showing male dominance. Most electrolyte imbalances were seen in age group of 1 to 5 years (67.06%). Abnormal serum electrolyte was seen in 37.91% in our study. SIADH was observed in 43.5% of euvolemic hyponatremic patients. SIADH was observed in 27.8% of hyponatremic patients. Respiratory disorder was the most common attributing factor for SIADH followed by CNS disorder.Conclusions: The present study showed high incidence of electrolyte abnormalities in patients admitted to pediatric intensive care unit. Though at times symptoms of electrolyte disorder is indistinguishable from symptoms of primary pathology, so a close monitoring and correction of electrolyte abnormalities is necessary for better outcome. SIADH is recognizable and common cause of electrolyte imbalance in PICU. Thus, this study recommends early routine monitoring of serum electrolytes in all patients admitted to PICU.

Syndrome of inappropriate antidiuretic hormone secretion in neonates with birth asphyxia at tertiary care centre

Background: Syndrome of inappropriate antidiuretic hormone is an important metabolic complication of perinatal asphyxia. This study aims to study the occurrence of syndrome of inappropriate antidiuretic hormone in different grades of perinatal asphyxia and to find out the correlation of syndrome of inappropriate antidiuretic hormone to gestational age and birth weight in birth asphyxiated babies.Methods: It was a hospital-based cohort study. 50 neonates with different grades of asphyxia were enrolled in the study and 50 controls were taken. Syndrome of inappropriate antidiuretic hormone was diagnosed based on calculated plasma osmolality, serum and urine sodium, urine specific gravity and analyzed with different grades of birth asphyxia and birthweight and gestation age.Results: The occurrence of SIADH in birth asphyxiated babies was 26% and none of the babies in control group developed SIADH. The occurrence was more in the severely asphyxiated babies (53.8%), followed by moderate (30.8%) and then mildly asphyxiated babies (15.4%). Hyponatremia was seen in 26% of birth asphyxiated babies and can be used as a marker of SIADH. In relation to gestation age and birth weight there was no statistically significant correlation between SIADH and different grades of asphyxia. Mortality was high among the neonates who developed SIADH.Conclusions: The occurrence of SIADH was 26% in asphyxiated neonates and high in severe asphyxia and gestation age and birth weight beard no significant co relation.

Insuficiencia suprarrenal secundaria: una causa subestimada de hiponatremia euvolemica

RESUMEN Introducción: La hiponatremia por insuficiencia suprarenal secundaria es subestimada tratamiento inapropiados. Objetivos: Describir las características clínicas y bioquímicas de pacientes con hiponatremia por insuficiencia suprarrenal secundaria y sus causas. Materiales y Metodos: Revisión retrospectiva de historias clínicas de pacientes consultantes a un hospital de tercer nivel entre Enero 2015 a Septiembre 2017 con hiponatremia y bioquímica de insuficiencia suprarenal secundaria. Los hallazgos fueron comparados con los reportados por estudios previamente publicados. Resultados: Todos los pacientes con insuficiencia suprarrenal secundaria se presentaron con hiponatremia euvolemica hipotónica. 54.5% eran mujeres, la edad promedio fue 57 años. Solo 1 paciente tuvo hiponatremia leve. La mediana de la concentración de cortisol fue 2.8 mcg/dL (RIQ 1.75-3.25 mcg/dL) y la de ACTH fue de 7.7 pg/nL (RIQ 4.5-9.5 pg/nL). Todos los pacientes tuvieron densidad urinaria alta indistinguible del SSIDH. El hipogonadismo hipogonadotrópico y el hipotiroidismo central fueron las alteraciones de ejes hipofisarios mas comúnmente asociados. La presencia de hipoglicemia, hipotensión e hipercaliemia fue baja. La causa más frecuente fue silla turca vacía. Conclusiones: La hiponatremia hipotonica euvolémica es una presentación común de insuficiencia suprarrenal secundaria y no suele acompañarse de otras manifestaciones de deficiencia de glucocorticoides. Es clínica y bioquímicamente indistinguible del SSIDH. Un bajo umbral de sospecha y la medición de cortisol serico matutino es esencial en estos pacientes para evitar un diagnostico y manejo inapropiados.

ABSTRACT Introduction: Hyponatremia due to secondary adrenal insufficiency is frequently underestimated and underdiagnosed. This paper underscores the importance of an adequate evaluation of euvolemic hyponatremia to avoid an inappropriate treatment and diagnosis. Objectives: To describe the clinical and biochemical characteristics of patients with hyponatremia due to secondary adrenal insufficiency and its causes. Materials and Methods: A retrospective review of the clinical records of patients presenting to a third level hospital between January 2015 to September 2017 with hyponatremia and a biochemical profile of secondary adrenal insufficiency. Findings were compared with previously published reports. Results: All patients with secondary adrenal insufficiency presented with hypotonic euvolemic hyponatremia. 54.5% of patients were females, median age was 57 years. Only 1 patient had mild hyponatremia. Cortisol median concentration was 2.8 mcg/dL (IQR 1.75-3.25 mcg/dL) and median ACTH concentration was 7.7 pg/nL (IQR 4.5-9.5 pg/nL). All the patients had high urinary density and features indistinguishable from SIADH. Hypogonadotropic hypogonadism and central hypothyroidism were the most commonly accompanying hypophyseal axis. Hypoglycemia, hypotension, and hyperkalemia were infrequent findings in these patients. The most frequent etiology identified was empty sella syndrome. Conclusions: Euvolemic hypotonic hyponatremia is a common presentation of secondary adrenal insufficiency and is often not accompanied with other manifestations of glucocorticoid deficiency. This disease is clinical and biochemical indistinguishable from SIADH. A low threshold for suspicion and a serum morning cortisol measurement in these patients is essential to avoid an inappropriate diagnosis and management.

Unusual paraneoplastic syndrome of inappropriate antidiuretic hormone secretion with gastric cancer

Syndrome of inappropriate antidiuretic hormone secretion (SIADH) results in impaired water excretion and consequent water intoxication and hyponatremia. In patients with cancer, SIADH is most commonly driven by ectopic ADH production, a paraneoplastic syndrome frequently seen in small cell lung cancer. A 63 year old male presented with loss of appetite, vomiting and hiccups. No abnormalities were detected on physical examination. Upper gastrointestinal endoscopy showed a proliferative growth in the stomach and histopathology report confirmed gastric adenocarcinoma. His laboratory investigations revealed low serum sodium and further work up for SIADH confirmed the diagnosis. The patient was treated with hypertonic saline and he improved symptomatically. He was subsequently treated with two cycles of capecitabine and oxaliplatin. The patient was asymptomatic and maintained a serum sodium in the range of 120 to 130 mEq/L, with a serum sodium of 127 mEq/L on follow up.

A Hospital Based Observational Study on Clinical Profile of Hyponatremia in Elderly

Introduction: Hyponatremia, which is defined as a plasmasodium concentration less than (<) 135mmol/L, is a verycommon disorder and can occur in up to 22% of hospitalisedpatients. Its prevalence among non-hospitalised elderlypatients has been estimated to be between 7% to 11.4%,increasing to 11% to 22.5% among the hospitalised patients. Itis also the most common dyselectrolytemia seen in thegeriatric population which occurs due to impaired water andelectrolytes balance in response to diet, drugs andenvironmental changes.Aims and Objectives: The aims of the study were to describethe clinical features and different causes of hyponatremia inhospitalised elderly patients and to find out the types ofhyponatremia and to assess the short term outcomes duringhospital stay.Methods and Materials: The study was a hospital basedobservational study conducted in Medicine Department andGeriatric Regional Centre, Gauhati Medical College andHospital, Guwahati for a period of one year from August 2017to September 2018. Ethical clearance was obtained from theethical committee. A total of 106 patients with hyponatremiawere included in the study with aged greater than or equal to(≥) 60 years.Results and Observations: The mean age was 70.04 yearswith a standard deviation of 6.73 years. Male and Female ratiowas 1: 1.12. The mean serum sodium level was 124.8 mmol/Lwith a standard deviation of 5.8 mmol/L. Altered sensorium (48cases, 45.3%) was the most common presenting symptomfollowed by lethargy (21 cases ,19.8%). The most commonetiology was found to be SIADH (32 cases, 30.2%) followed byrenal failure (19 cases, 18%) and intake of drugs like diuretics(18 cases, 17%). Among SIADH majority of the cases werefound to have pneumonia (12 cases, 37.5%) followed by stroke(9 cases, 28.1%) and brain infections like meningitis andencephalitis (5 cases, 15.6%). In hyponatremia, majority of thecases was found to be in euvolemic status (55 cases, 51.9%).The overall mortality of hyponatremic patients was 8.5%. Shortterm outcomes in patients with comorbid condition like chronickidney disease was found to be significantly higher (pvalue=0.0396).Conclusion: Hyponatremia is a very common dyseletrolytemiaand clinical problem encountered in the elderly population andis associated with high morbidity and mortality particularlywhen associated with comorbidities.

Acute Intermittent Porphyria: A rare cause of hyponatraemia

@#Introduction: Hyponatraemia is one of the most frequent laboratory findings in hospitalised patients. We present an unusual case of hyponatraemia in a 23-year-old female secondary to acute intermittent porphyria (AIP), a rare inborn error of metabolism. Case Report: The patient presented with upper respiratory tract infection, fever, seizures and abdominal pain. An initial diagnosis of encephalitis was made. In view of the unexplained abdominal pain with other clinical findings such as posterior reversible encephalopathy syndrome by CT brain, temporary blindness as well as hyponatraemia, acute intermittent porphyria was suspected. Urine delta aminolaevulinic acid (δ-ALA) and porphobilinogen were elevated confirming the diagnosis of AIP. Genetic studies were done for this patient. The patient had a complete resolution of her symptoms with carbohydrate loading and high caloric diet. Conclusion: Although rare, AIP should be considered as a cause of hyponatraemia in a patient who presents with signs and/or symptoms that are characteristic of this disease.

Carcinoma de próstata y síndrome de secreción inadecuada de hormona antidiurética / Prostate carcinoma and syndrome of inappropriate antidiuretic hormone secretio

El cáncer de próstata es una causa extremadamente rara de síndrome de secreción inadecuada de hormona antidiurética (SIADH). Se trata de tumores agresivos asociados a un síndrome que puede aparejar consecuencias graves. Un paciente de 64 años fue diagnosticado de adenocarcinoma de próstata Gleason 4+3: 7 en 2014 y recibió terapia de bloqueo hormonal. En 2015 debió ser ingresado por hiponatremia sintomática y se le diagnosticó un SIADH, sin otra causa probable más que el cáncer de próstata. Sufrió rápida progresión de su enfermedad oncológica, llamativamente cuando su PSA se encontraba en valores normales, y falleció al corto plazo. Existe gran variabilidad clínica e histopatológica de los casos informados en la literatura de asociación de carcinoma de próstata y SIADH, sin embargo, todos coinciden en la agresividad de estos tumores. Estas características se presentan en tumores con diferenciación neuroendocrina, frecuentemente resistentes al tratamiento hormonal y que pueden presentar síndromes paraneoplásicos como el SIADH. El perfil de sus alteraciones moleculares se encuentra en estudio para el desarrollo de terapias target. La asociación de adenocarcinoma de próstata y SIADH es muy infrecuente y podría implicar diferenciación neuroendocrina. Por tal motivo es esencial una nueva biopsia del tumor o de sus metástasis a la progresión de la enfermedad para poder conducir un tratamiento adecuado de acuerdo a sus características morfológicas, inmunohistoquímicas y, en un futuro, moleculares.

Prostate cancer is an extremely rare cause of syndrome of inappropriate antidiuretic hormone (SIADH) secretion. These tend to be aggressive tumors and SIADH can carry serious clinical consequences. A 64 years old patient was diagnosed with Gleason 4+3: 7 prostate adenocarcinoma in December 2014 and received hormonal blockade therapy. By March 2015 he was admitted for symptomatic hyponatremia and SIADH secretion was diagnosed, with no other probable cause than prostate cancer. He suffered a rapid progression of his oncologic disease, surprisingly with PSA in normal range, and died in the short term. There is great clinical and histopathological variability in the cases reported in the literature of association of prostate carcinoma and SIADH. However, they all agree on the aggressiveness of these tumors. This characteristic is present in tumors that have neuroendocrine features. They are frequently resistant to hormonal treatment and may present with paraneoplastic syndromes such as SIADH. The profile of its molecular alterations is under study for the development of target therapies. The association of prostate adenocarcinoma and SIADH is very uncommon and could involve neuroendocrine differentiation. For this reason, it is essential to perform a new biopsy of the tumor or its metastases at the progressive disease in order to conduct an appropriate treatment according to its morphological, immunohistochemical and, in the future, molecular characteristics.

Study of etiology, clinical features and outcome following treatment of hyponatremia in elderly in intensive care unit

Background: Hyponatremia is a common electrolyte disturbance in the hospitalized elderly sick patients. Objectives: To study etiology, clinical features and outcome following treatment of hyponatremia in elderly hospitalized patients. Materials and methods: All elderly patients being admitted to ICU were screened for hyponatremia and 100 patients with severe hyponatremia (<125 meq/L) were included in this study, these patients were investigated as per the protocol and were treated as per the standardized regimen. Results: 100 patients with severe hyponatremia (<125 mEq/L) were studied. There was female preponderance of cases (55%). The common causes of hyponatremia were SIADH (30%) and drugs (24%) of which diuretics (79%) was a major chunk. The common CNS symptoms were drowsiness, lethargy and irrelevant talk. The common co-morbid conditions were hypertension (62%) and diabetes mellitus (51%). Females tolerated hyponatremia better than males with mortality of 9.09% in females and 33.33% in males (p=0.0026). 20 (20%) patients succumbed to their primary illness with a possible contribution attributable to hyponatremia or its treatment. M. Krishna Naik, Md. Yousuf Khan, D. Prathima Raj, D. Venkatesh, Krishna Kumar T V. Study of etiology, clinical features and outcome following treatment of hyponatremia in elderly in intensive care unit. IAIM, 2017; 4(11): 144-152. Page 145 Conclusion: Hyponatremia is common in females and they seem to better tolerate it than their male counterparts. Early detection, strict adherence to treatment protocol is required. Diuretics should be used with caution in elderly.

Syndrome of Inappropriate Antidiuretic Hormone Secretion (SIADH) Associated with Mediastinal Schwannoma

Syndrome of inappropriate antidiuretic hormone secretion (SIADH) is the most common cause of euvolemic hypo-osmotic hyponatremia. There are several etiologies of SIADH including neuroendocrine tumor, pulmonary disease, infection, trauma, and medications. Here, we report a case of SIADH associated with a schwannoma involving the mediastinum in a 75-year-old woman who presented with nausea, vomiting, and general weakness. Laboratory testing showed hypo-osmolar hyponatremia, with a serum sodium level of 102mmol/L, serum osmolality of 221mOsm/kg, urine osmolality of 382mOsm/kg, urine sodium of 55 mmol/L, and plasma antidiuretic hormone (ADH) of 4.40 pg/mL. Chest computed tomography identified a 1.5-cm-sized solid enhancing nodule in the right lower paratracheal area. A biopsy specimen was obtained by video-assisted thoracoscopic surgery, which was diagnosed on pathology as a schwannoma. The hyponatremia was completely resolved after schwannoma resection and plasma ADH level decreased from 4.40 pg/mL to 0.86 pg/mL. This case highlights the importance of suspecting and identifying the underlying cause of SIADH when faced with refractory or recurrent hyponatremia, and that on possibility is mediastinal schwannoma

Research progress on small cell lung cancer with syndrome of inappropriate secretion of antidiuretic hormone / 中国肿瘤临床

Many malignant tumors, most commonly small cell lung cancer, merge with syndrome of inappropriate secretion of antidi-uretic hormone (SIADH). SIADH is caused by the neuroendocrine function of tumor cells or is a side effect of chemotherapeutics. As a chemotherapeutic side effect, SIADH presents as hyponatremia. Therapy for SIADH includes both treatment for primary diseases and hyponatremia. Given that SIADH-induced hyponatremia aggravates the prognosis and shortens the survival time of patients with malig-nant tumors, SIADH is an independent risk factor for prognosis. Therefore, the early diagnosis, monitoring, and treatment of SIADH will improve the prognosis of patients with malignant tumors.

SIADH secundario a adenocarcinoma seroso de ovario tratado con tolvaptán / SIADH secondary to serous ovarian adenocarcinoma treated with tolvaptan

La hiponatremia es la alteración electrolítica más frecuente en el medio hospitalario, y en un 30% de los casos se debe a un síndrome de secreción inapropiada de vasopresina (SIADH). El SIADH está descrito como cuadro paraneoplásico endocrinológico en múltiples tumores, entre los que excepcionalmente se encuentra el de ovario y las neoplasias ginecológicas en general. Presentamos un caso de SIADH paraneoplásico por un citoadenocarcinoma seroso de ovario de alto grado, estadio IV. Se trata del primer caso de SIADH crónico por cáncer de ovario tratado con Tolvaptán. En el presente caso el objetivo de eunatremia se alcanzó con una dosis baja de acuarético, lo que apoya la elevada sensibilidad, ya previamente documentada, de los SIADH tumorales al tratamiento con Tolvaptán.

Hyponatremia is the most common electrolyte disturbance in hospitals, and 30% of cases are due to syndrome of inappropriate secretion of antidiuretic hormone (SIADH). SIADH is described as an endocrine paraneoplastic syndrome in multiple tumors including, ovary and gynecological malignancies in general, although these are exceptional. We report a case of paraneoplastic SIADH for high-grade serous ovarian cystoadenocarcinoma stage IV. This is the first case of chronic SIADH for ovarian cancer treated with Tolvaptan. In this case the target of eunatremia was reached with a low dose of aquaretic, which supports the high sensitivity, as previously documented, of paraneoplasic SIADH to Tolvaptan.

Hiponatremia luego de uso de cisplatino: a propósito de un caso / Hyponatraemia after cisplatin use: a case report

Paciente de 26 años con diagnóstico de teratoma inmaduro de ovario derecho. Se le realizó resección del tumor más salpingooforectomía en junio de 2014. Recibió manejo adyuvante con carboplatino y ciclofosfamida por un ciclo en enero de 2015, pero sin respuesta. Se realizó laparotomía exploradora por obstrucción intestinal evidenciándose masa pélvica e implantes peritoneales a nivel hepático. Valoró oncología clínica del INC en febrero del 2015, se inicia manejo con esquema PEB; recibió el primer ciclo sin complicaciones. El segundo ciclo fue retrasado por infección en la pared abdominal. Empezó tratamiento con sodio sérico normal, con posterior descenso sin alteración en el resto de electrolitos, función renal, ni estado ácido base. La paciente no presentó síntomas neurológicos y estuvo euvolémica. Se inició estudio de hiponatremia haciéndose diagnóstico de SIADH. Se indicó manejo con restricción hídrica y dieta hipersódica, con posterior ascenso gradual de niveles séricos de Na, considerándose SIADH secundario a uso de cisplatino.

The case is presented of a 26 year-old patient diagnosed with an immature teratoma of the right ovary. Tumour resection plus salpingo-oophorectomy was performed in June 2014. She received one cycle of adjuvant treatment with carboplatin and cyclophosphamide, but with no response. An exploratory laparotomy was performed due to an intestinal obstruction, which showed a pelvic mass and peritoneal implants at hepatic level. She was assessed in the oncology clinic of the Colombian National Institute (INC) in February 2015, and treatment with a platinol (cisplatin), etoposide, and bleomycin (PEB) scheme was started. She received the first cycle without complications, but the second cycle was delayed due to an infection in the abdominal wall. She started the treatment with a normal serum sodium, with a subsequent decrease with no changes in the rest of the electrolytes, kidney function, or acid-base status. The patient showed no neurological signs and was euvolaemic. A hyponatraemia study was performed, ending up making the diagnosis of inappropriate antidiuretic hormone secretion (IADHS). A water restriction and high sodium diet was indicated, with the subsequent gradual increase in the serum Na levels. The IADHS was considered secondary to the use of cisplatin.

Sarcoidosis-associated Syndrome of Inappropriate Antidiuretic Hormone Secretion / 대한내과학회지

Syndrome of inappropriate antidiuretic hormone secretion (SIADH), the most common cause of euvolemic hyponatremia, results from the inappropriate release of antidiuretic hormone. SIADH may be caused by a variety of malignant tumors, central nervous system (CNS) disorders, intrathoracic disorders, and pharmacological agents. We experienced a case of SIADH associated with sarcoidosis that involved the lungs and mediastinal lymph nodes. A 72-year-old male was admitted to hospital with epigastric and back pain. Laboratory tests showed hyponatremia and low serum osmolality, while the urine sodium concentration and urine osmolality were inappropriately high. A chest x-ray and computed tomography showed mediastinal lymph node enlargement, and a mediastinoscopic lymph node biopsy revealed a noncaseating granuloma. Brain magnetic resonance imaging showed no evidence of CNS sarcoidosis. Systemic corticosteroid therapy improved the observed mediastinal lymph node involvement, and tolvaptan as an SIADH treatment corrected the patient's abnormal sodium level and restored the laboratory findings to normal.

Escitalopram Induced Hyponatremia

National and international pharmacovigilance committee reports and case-control studies also implicate paroxetine, fluoxetine, sertraline. However, there have been only few reported cases of hyponatremia associated with escitalopram. The objective of this case report is to highlight a strong association of hyponatremia and SIADH (Syndrome of Inappropriate ADH secretion) in a middle-aged patient receiving escitalopram, a drug less commonly known to cause such side effects. Methods: We report a case of escitalopram induced severe hyponatremia in a middle-aged man where the association of hyponatremia with escitalopram is clearly established. Patient developed hyponatremia on the rechallenge with escitalopram (serum sodium = 94 mEq/L) within two days of initiation of treatment. The patient was free from other medical illnesses and was not taking other medications known to cause hyponatremia (confounders present in previous case reports suggesting an association between escitalopram and SIADH). Results: Our case suggests a strong association of escitalopram use and development of hyponatremia and SIADH in the absence of another drug use and medical comorbidity. Conclusion: Escitalopram, an SSRI is associated with hyponatremia and SIADH even in middle-aged individuals. There is a need for case-control studies especially involving a younger and middle age group. ASEAN Journal of Psychiatry, Vol. 17 (2): July – December 2016: XX XX.

Case of Syndrome of Inappropriate Antidiuretic Hormone Secretion in a Patient with Esophageal Cancer / 대한내과학회지

Syndrome of inappropriate secretion of antidiuretic hormone (SIADH) may be observed in various types of cancer, but is mainly seen in small-cell carcinoma. It can also be caused by several chemotherapeutic agents. However, it is a very rare phenomenon in esophageal cancer or its treatment. We report here on a case of SIADH related to esophageal cancer treatment. A 55-year-old man received chemoradiotherapy (CRT) for esophageal cancer. After receiving CRT for 5 days, he complained of nausea, dizziness, and general weakness, and his sodium level had dropped to 107 mEq/L. His volume status was clinically euvolemic and there were no edema or pigmentation. After hypertonic saline infusion, the sodium level increased and the symptoms improved. There have been several reports of SIADH associated with malignancies or chemotherapy agents. However, to the best of our knowledge, this is the first Korean case of SIADH associated with esophageal cancer that occurred after cisplatin treatment.

Bases fisiopatológicas de los transtornos del sodio en pediatría / Pathophysiology of sodium disorders in children

Las disnatremias son el transtorno hidroelectrolítico prevalente en pacientes ambulatorios y hospitalizados. Su manejo inadecuado puede tener serias consecuencias, asociándose a un aumento en la morbimortalidad de los pacientes. El objetivo de este artículo es actualizar las bases fisiopatológicas de las disnatremias y revisar herramientas clínicas y de laboratorio que nos permitan realizar un enfrentamiento rápido y simple. Las disnatremias reflejan un transtorno del balance del agua, y el balance de agua tiene relación directa con la osmorregulación. Existen mecanismos para mantener el control de la osmolalidad plasmática, los cuales se gatillan con cambios de un 1-2 por ciento. A nivel hipotalámico existen osmorreceptores que censan cambios en la osmolalidad plasmática, regulando la secreción de Hormona Antidiurética (ADH), la que ejerce su acción a nivel renal, por lo cual el riñón es el principal regulador del balance hídrico. Cuando se está frente a una disnatremia, es fundamental evaluar cómo está funcionando este eje ADH-riñón. Dentro de las hiponatremias existen causas que son fáciles de identificar, sin embargo, diferenciar un síndrome de secreción inadecuada de ADH con un síndrome pierde sal cerebral suele ser más difícil. En el caso de las hipernatremias, sospechar una diabetes insípida y diferenciar su posible origen, central o nefrogénico, es fundamental para su manejo. En conclusión, el enfrentamiento de una disnatremia requiere conocer las bases fisiopatológicas de su desarrollo, para así poder realizar un diagnóstico certero y finalmente un tratamiento adecuado, evitando errores en su corrección que pueden poner en riesgo al paciente.

Dysnatremia is among the most common electrolyte disorders in clinical medicine and its improper management can have serious consequences associated with increased morbidity and mortality of patients. The aim of this study is to update the pathophysiology of dysnatremia and review some simple clinical and laboratory tools, easy to interpret, that allow us to make a quick and simple approach. Dysnatremia involves water balance disorders. Water balance is directly related to osmoregulation. There are mechanisms to maintain plasma osmolality control; which are triggered by 1-2 percent changes. Hypothalamic osmoreceptors detect changes in plasma osmolality, regulating the secretion of Antidiuretic Hormone (ADH), which travels to the kidneys resulting in more water being reabsorbed into the blood; therefore, the kidney is the main regulator of water balance. When a patient is suffering dysnatremia, it is important to assess how his ADH-renal axis is working. There are causes of this condition easy to identify, however, to differentiate a syndrome of inappropriate ADH secretion from cerebral salt-wasting syndrome is often more difficult. In the case of hypernatremia, to suspect insipidus diabetes and to differentiate its either central or nephrogenic origin is essential for its management. In conclusion, dysnatremia management requires pathophysiologic knowledge of its development in order to make an accurate diagnosis and appropriate treatment, avoiding errors that may endanger the health of our patients.

A Case of Hyponatremia Associated with Paroxetine: A case report

Paroxetine is a selective serotonin reuptake inhibitor (SSRI) widely used for depression in brain damaged patients as it is known for its few affects on cognition or psychomotor function. Major side effects observed for paroxetine are vertigo, headache and tremor. It is reported that hyponatremia is also rarely observed. In 69 year-old male with left hemiplegia due to cerebral infarction had started taking 20 mg/day of paroxetine for depression. Next day the patient showed severe generalized weakness and decreased consciousness. Laboratory tests showed that serum sodium level was decreased to 102 mEq/L. Paroxetine administration was stopped and 3% sodium and oral furosemide were administered under the diagnosis of syndrome of inappropriate secretion of antidiuretic hormone (SIADH). We report a case of patient with severe hyponatremia due to SIADH within 2 days after use of paroxetine. This case emphasizes the need to monitor serum sodium level routinely at the initial treatment to prevent hyponatremia.

Management of Chronic Asymptomatic Hyponatremia / 대한내과학회지

Hyponatremia is a common clinical problem in hospitalized patients and nursing home residents. It may also occur in healthy athletes after endurance exercise. The majority of patients with hyponatremia are asymptomatic and do not require immediate correction of the hyponatremia. While mild hyponatremia has traditionally been considered benign, symptomatic hyponatremia is a medical emergency requiring rapid correction to prevent the worsening of brain edema. However, it has been suggested that mild hyponatremia may be associated with gait disturbance, attention deficits, and an increased risk of falls, which may result in fracture, and its presence predicts a poor prognosis. The syndrome of inappropriate secretion of antidiuretic hormone (SIADH) is among the most frequent causes of chronic hyponatremia. Hyponatremia must be corrected slowly (<10~12 mmol/L within the first 24 h, and <18 mmol/L within the first 48 h) to avoid osmotic myelinolysis. Fluid restriction and demeclocycline are the treatments for chronic hyponatremia used most widely. However, fluid restriction is of limited use because of poor long-term compliance and demeclocycline lacks broad availability. In controlled clinical trials vaptans (a vasopressin receptor antagonist) was efficacious in mild to moderate SIADH with an acceptable safety profile. However, its long-term use is currently impractical and more data are needed.

Síndrome de secreción inadecuada de hormona antidiurética inducido por carbamazepina: presentación de un caso / Cabamazepine-indduced sindrome of inappropriate seretion of antiddiuretic hormone: a case presentation

El síndrome de secreción inadecuada de hormona antidiurética (SSIHAD), es una causa frecuente de hiponatremia; se ha descrito asociado a alteraciones en el sistema nervioso central, hipotiroidismo, insuficiencia adrenal, neoplasias, enfermedades pulmonares, anestesia general y varios fármacos psicoactivos. Describimos el caso de un varón diagnosticado de neuralgia del trigémino, quien presento hiponatremia por SSIHAD, secundario al tratamiento con carbamazepina.

The inadequate vasopressin secretion syndrome it's a frequent cause of hyponatremia; we have descriptions of alterations in Central Nervous system, hypotiroidism, adrenal insufficiency, neoplasms, neumologic diseases, general anesthesia and many psychoactive drugs. We describe a case of a masculine patient with diagnosed of trigeminal neuralgia, who presents hyponatremia secondary to SIADH, as an adverse reaction of the treatment with Carbamazepine.