Related Experiment Video
Updated: Jul 29, 2026
10:09
Selection of Plasmodium falciparum Parasites for Cytoadhesion to Human Brain Endothelial Cells
Published on: January 3, 2012
Pituitary-adrenal function in uncomplicated falciparum malaria
Summary
Acute falciparum malaria patients show higher cortisol levels and a blunted suppression response to dexamethasone, indicating altered pituitary-adrenal function. This suggests a protective mechanism against malaria complications like hypoglycemia.
Area of Science:
- Endocrinology
- Infectious Diseases
- Malariology
Background:
- Acute uncomplicated falciparum malaria can affect various physiological systems.
- Pituitary-adrenal axis function is crucial for stress response and metabolic homeostasis.
Purpose of the Study:
- To investigate pituitary-adrenal function in adults with acute uncomplicated falciparum malaria.
- To assess the impact of malaria on cortisol suppression following dexamethasone administration.
Main Methods:
- Overnight dexamethasone suppression test in 13 Vietnamese adults with malaria and 6 healthy controls.
- Measurement of serum cortisol and plasma ACTH at specified intervals before and after dexamethasone.
- Patients received standard antimalarial and supportive care.
Main Results:
- Patients had significantly higher baseline serum cortisol levels compared to controls.
- Cortisol suppression after dexamethasone was less pronounced in malaria patients.
- Plasma ACTH levels were similar at baseline and suppressed similarly in both groups after dexamethasone.
Conclusions:
- Uncomplicated falciparum malaria is associated with a raised set point for cortisol inhibition of ACTH secretion.
- Corticotrophin responsiveness to dexamethasone appears normal, but cortisol half-life may be prolonged.
- Elevated cortisol may offer protection against malaria complications such as hypoglycemia.
More Related Videos
Related Concept Videos
01:22Effect of Hepatic Disease on Pharmacokinetics: Pathophysiologic Assessment and Liver Function Test
In clinical practice, the direct measurement of hepatic blood flow to evaluate liver function presents significant challenges due to the intricate and specialized nature of the necessary techniques. Consequently, healthcare professionals often rely on empirical estimates derived from thorough patient examinations and liver function tests to gauge liver health. Among the tools at their disposal, the Child–Pugh and MELD scoring systems stand out for their ability to categorize and assess the...
01:29Malaria
Malaria pathogenesis in humans reflects a delicate interplay between parasite biology and host response. Clinical illness reflects a host’s immune response to the parasite’s asexual replication cycle, which is often asymptomatic in individuals with partial immunity. From the parasite's perspective, transmission between mosquito and human with minimal host pathology is evolutionarily advantageous. Among the six Plasmodium species infecting humans, P. falciparum and P. vivax dominate in global...
01:19Cushing Syndrome II: Pathophysiology
Cortisol production is normally governed by the hypothalamic–pituitary–adrenal (HPA) axis, which maintains hormonal balance through tightly regulated feedback mechanisms. Disruption of this regulatory system is central to the development of Cushing syndrome, whether the excess cortisol originates from external medications or internal pathology. Persistent cortisol elevation alters metabolism, immune function, and endocrine signaling, producing the characteristic clinical features of the...