Primary hypoadrenocorticism in a dog / Hipoadrenocorticismo primário em um cão / Hipoadrenocorticismo primario en un perro

This report describes the clinical and laboratorial findings as well as the therapeutic protocol performed in a three-year-old mongrel female intact dog, referred to the Veterinary Hospital of FAMEZ/UFMS. The animal had a previous history of recurrent gastrointestinal signs (such as lethargy, vomiting, loss of appetite, melena and abdominal pain), acute crisis episodes, bradycardia, hypotension, hypothermia and increase of capillary refill time, recognized as addisonian crisis due to primary hypoadrenocorticism. Laboratorial findings included anemia, eosinophilia, neutrophilia, lymphocytosis, sodium-potassium ratio of 14,02 mEq/L and prerenal azotemia. Based on that, it was confirmed the diagnosis of primary hypoadrenocorcitism. Thus, it was recommended supplementation therapy with mineralocorticoid (aldosterone) and glucocorticoid (cortisol) corresponding respectively, fludrocortisone acetate of 0.2 mg per kg of BW, by mouth, once daily and prednisone 0.2 mg per kg of BW, by mouth, twice daily until further recommendations. The prognostic was excellent, since the animal significantly improved body condition, andclinical signs disappeared after therapy which lead the sodium-potassium ratio to 35.11 mEq/L. Thus, the clinician must always suspect of primary hypoadrenocorticism in dogs with intermittent nonspecific signs that get better with support therapy. Presumably, hypoarenocorticism must be under diagnosed in veterinary medicine, reinforcing the need to require specific exams in patients that show this wax and wane feature of clinical signs.

O presente relato descreve os achados clínicos, laboratoriais e conduta terapêutica de um animal da espécie canina, fêmea, com três anos de idade, inteiro, sem raça definida, diagnosticado com hipoadrenocorticismo primário atendido no Hospital Veterinário da FAMEZ/UFMS. O animal apresentou histórico de recidivas de sinais gastrintestinais (letargia, vômitos, perda de apetite, melena e dor abdominal), crise adrenal aguda, bradicardia, hipotensão, hipotermia e aumento do tempo de preenchimento capilar. As alterações laboratoriais compreenderam linfocitose, anemia, eosinofilia, neutrofilia, densidade urinária < 1.030, relação sódio: potássio 14,02 mEq/L e azotemia pré-renal. Baseado nos achados clínicos-laboratoriais confirmou-se o hipoadrenocorticismo primário. Em seguida, foi instituído terapia de suplementação de mineralocorticoide (aldosterona) e glicocorticoide (cortisol), correspondendo respectivamente ao acetato de fludrocortisona na dose de 0,2 mg/kg por via oral uma vez ao dia e prednisona 0,2 mg/kg por via oral duas vezes por dia até novas recomendações. O prognóstico foi excelente para este caso, já que houve melhora significativa do animal, com o desaparecimento dos sinais clínicos e com nova relação sódio: potássio de 35,11 mEq/L. Assim, deve-se sempre suspeitar de hipoadrenocorticismo primário canino em pacientes com o curso de aparecimento e desaparecimento com sinais inespecíficos que melhorem com terapia de suporte. Presume-se que o hipoadrenocorticismo primário em cães seja subdiagnosticado na medicina veterinária, por isso a importância dos clínicos em suspeitar e solicitar exames específicos em pacientes que apresentam esse curso da doença.

El informe describe los hallazgos clínicos, de laboratorio y manejo terapéutico de un perro, hembra, con tres años de edad, entera, mestizo, con diagnóstico de hipoadrenocorticismo primario atendido en el Hospital Veterinario de la FAMEZ/UFMS. El animal tuvo un historial de signos gastrointestinales recurrentes (letargia, vómitos, pérdida de apetito, melena y dolor abdominal), crisis renal aguda, bradicardia, hipotensión, hipotermia y un aumento del tiempo de llenado capilar. Las alteraciones de laboratorio presentaron linfocitosis, anemia, eosinofilia, neutrofilia, densidad de la orina < 1,030, relación sodio: potasio 14,02 mEq/L y azotemia prerrenal. Con base en los hallazgos clínicos y de laboratorio, se confirmó el hipoadrenocorticismo primario. A continuación, se introdujo terapia con administración de mineralocorticoide (aldosterona) y glucocorticoide (cortisol), que correspondieron respectivamente al acetato de fludrocortisona a una dosis de 0,2mg/kg por vía oral una vez al día y prednisona 0,2 mg/kg por vía oral dos veces al día hasta nuevas recomendaciones. El pronóstico fue excelente para este caso, ya que hubo mejora significativa del animal, desapareciendo los signos clínicos y con una nueva relación sodio: potasio de 35,11 mEq/L. Por lo tanto, siempre se debe sospechar del hipoadrenocorticismo primario canino en pacientes con el curso de aparecimiento y desaparecimiento con signos inespecíficos que mejoran con terapia de soporte. Es posible que el hipoadrenocorticismo primario en perros sea diagnosticado en la medicina veterinaria, así la importancia de los clínicos en sospechar y solicitar exámenes específicos en pacientes que presentan ese curso de la enfermedad.

Insuficiência adrenal aguda / Acute adrenal insufficiency

A insuficiência adrenal (IA) consiste em síndrome clínica rara, decorrente da deficiência de glicocorticoides e/ou mineralocorticoides, podendo ser primária. A insuficiência adrenal aguda consiste em emergência endócrina rara, resultante da diminuição súbita do cortisol circulante, ou de aumento significativo da demanda por esse hormônio em pacientes com algum grau de disfunção adrenal, ocorrendo mais frequentemente no contexto da IA primária. O prognóstico da doença depende do reconhecimento e intervenção terapêutica precoces

Adrenal insuficiency (AI) consists of a rare clinical syndrome resulting from glucocorticoids and/or mineralocorticoids deficiency. Adrenal insufficiency may be primary. The acute AI is a rare endocrine emergency resulting from sudden decrease of circulating cortisol or, elevated demand for this hormone in patients with some degree of adrenal disfunction, occuring more frequently in primary AI. The prognosis depends on early recognition and precocious therapeutic intervention

Mineralocorticoid modulation of central angiotensin-induced neuronal activity, water intake and sodium appetite

Central angiotensin II (AngII) stimulates water and salt solution intake. Pretreatment with low-dose mineralocorticoid (DOCA) enhances this AngII-induced intake of salt solutions (the synergy theory) in Wistar and Sprague Dawley rats but not in Fischer rats. This response is mediated via the AT-1 receptor. Electrophysiological experiments using iontophoretic application of AngII and the AT-1 receptor-specific non-peptide antagonist losartan showed excitation of neurons in the preoptic/medial septum region of urethane-anesthetized male Wistar rats. DOCA pretreatment further enhances this neuronal excitation in response to AngII and reduces the responses to losartan. This generated the hypothesis that DOCA-enhanced AngII-induced neuronal excitation is the neural support for the synergy theory. AT-2 receptors modulate these intake responses depending on sodium in the diet, and diuretic-induced dehydration during pregnancy produces a higher salt intake in the offspring. AngII-induced salt and water intakes were tested in offspring from Sprague Dawley mothers with only 1.8 percent NaCl to drink in which half were treated with furosemide. The important observations were a) the AT-1 antagonist alone suppressed intakes in offspring from mothers not treated with furosemide, b) both AT-1 and AT-2 antagonists suppressed intakes in offspring from furosemide-treated mothers, and c) combined administration of AT-1 and AT-2 antagonists greatly suppressed water intake in offspring from mothers not treated with furosemide. These results suggest that AT-1 and AT-2 receptors have variable properties (receptor number and/or second messengers). Furthermore, the activity and function of these central AngII receptors depend on the background mineralocorticoid levels. The exact mechanism of this influence, however, remains to be determined.