Manifestations in acute nephritic syndrome
In complicated acute nephritic syndrome, a pronounced dyspeptic symptom complex develops. Vomiting syndrome here is inextricably linked with persistent nausea and exhausting hiccups. Such a gastrointestinal presentation indicates a high risk of developing acute renal failure (ARF).
In addition to dyspepsia, life-threatening conditions come to the forefront:
- Cardiovascular catastrophes: due to a sharp increase in circulating blood volume (CBV) and arterial hypertension, acute left ventricular dysfunction occurs. Clinically, this manifests as pulmonary edema and the appearance of an auscultatory phenomenon — a "gallop rhythm".
- Neurological disorders: angiospastic encephalopathy (renal eclampsia) and muscle cramps.
Vomiting in acute pancreatitis
In acute pancreatitis, vomiting syndrome and nausea are key signs. The direct cause of their occurrence is the development of gastric and small intestine atony (intestinal paresis), which is also accompanied by severe flatulence.
The leading sign remains pain syndrome. The pain is constant, often girdle-like, radiating to the back. It is localized in the umbilical zone, epigastrium, or hypochondria. A characteristic marker is its relationship with body position: pain sharply increases in the supine position, while relief occurs in a forced posture (sitting with the trunk leaned forward).
The disease is accompanied by severe systemic reactions:
- Fever and tachycardia.
- Arterial hypotension up to shock (the result of hypovolemia and the vasodilating effect of kinins, which reduce myocardial contractility).
- Obstructive jaundice (due to compression of the common bile duct by the edematous head of the pancreas).
- Subcutaneous nodules with erythema (fat necrosis of adipose tissue) and signs of an "acute abdomen" with weakened peristalsis.
Dyspepsia in carbohydrate and electrolyte metabolism disorders
Vomiting syndrome may manifest against the background of electrolyte and carbohydrate imbalance associated with endocrine pathology. As part of gastrointestinal disorders, such patients experience persistent nausea, vomiting, anorexia, and diarrhea (due to large bowel dysfunction).
The concomitant clinical picture includes:
- Asthenic syndrome: progressive weakness and sharp weight loss.
- Hemodynamic disturbances: persistent arterial hypotension. The mechanism lies in a decrease in CBV and a drop in stroke and cardiac output.
- Psychoneurological status: increased excitability, up to the development of psychoses.
- Dermatological manifestations: hyperpigmentation (melanoderma). Due to hypersecretion of ACTH and melanotropins, the skin acquires a dark gray color with a brownish tint, especially in areas of clothing friction and sun-exposed areas.
Vomiting syndrome in hyperparathyroidism
In hyperparathyroidism — excessive secretion of parathyroid hormone (PTH) by an adenoma or hyperplastic glands — dyspepsia develops slowly. Patients (most often women around 50 years of age) complain of loss of appetite, nausea, vomiting, and significant weight loss. The main cause of the clinical picture is persistent hypercalcemia.
The disease has two main forms of involvement:
- Bone form: demineralization leads to systemic osteoporosis. Destructive foci (cysts) are visible on radiographs of the long tubular bones, pelvis, spine, and ribs, and pathological fractures occur.
- Visceropathic form: the gastrointestinal tract suffers (pancreatitis, peptic ulcer disease of the stomach and duodenum occur in 20% of patients) and the kidneys (nephrocalcinosis and urolithiasis develop).
Neuromuscular manifestations are also characteristic: cramps, depression, muscle weakness, and atrophy.
For quick memorization of the mechanism of hypercalcemia in hyperparathyroidism, use the "Three Ws" rule: WASHING OUT (bone resorption), WELL-ABSORBED (increase in the GI tract), and withholding — decreased EXCRETION (increased renal reabsorption).
Class and exam questions
What is the mechanism of vomiting development in acute pancreatitis?
Vomiting and nausea in pancreatitis occur due to the development of gastric atony and small bowel paresis. This process is also accompanied by pronounced abdominal distension (flatulence).
In what body position does the pain in pancreatitis accompanied by vomiting become less severe?
Relief occurs exclusively in a forced posture — sitting with the trunk leaned forward. In the supine position, the pain syndrome, conversely, increases significantly.
How are dyspeptic syndrome and electrolyte disturbances related?
In electrolyte and carbohydrate metabolism disorders (against the background of ACTH hypersecretion), severe dyspepsia occurs: vomiting, anorexia, and diarrhea. This proceeds in parallel with asthenia, decreased CBV, and arterial hypotension.
What complications does acute nephritic syndrome lead to besides vomiting?
Along with nausea, vomiting, and hiccups, acute renal failure, muscle cramps, renal eclampsia, and acute left ventricular failure with the threat of pulmonary edema may develop.
What else to study on this topic
- Mechanisms of shock development in pancreatitis (the effect of kinins and hypovolemia)
- Pathogenesis of acute left ventricular failure in severe hypervolemia
- Visceropathic form of hyperparathyroidism (nephrolithiasis and peptic ulcer disease)
- Causes of hyperpigmentation (melanoderma) in melanotropin hypersecretion
- Bone form of hyperparathyroidism: radiological signs and destructive foci
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