Urinary catecholamine excretion, cardiovascular variability, and outcomes in tetanus

Area of Science:

• * Neuroscience
• * Infectious Diseases
• * Critical Care Medicine

Background:

• * Severe tetanus presents with muscle spasms and cardiovascular disturbances, often due to autonomic nervous system dysfunction (ANSD).
• * The link between catecholamines (adrenaline and noradrenaline) and ANSD in tetanus is not fully understood, with previous studies limited by methodology.
• * Understanding this relationship is crucial for managing severe tetanus complications.

Purpose of the Study:

• * To characterize the relationship between catecholamines, cardiovascular parameters, and clinical outcomes in adult tetanus patients.
• * To investigate the association between urinary catecholamine excretion and the development of ANSD.
• * To explore the impact of intrathecal antitoxin administration on catecholamine excretion.

Main Methods:

• * A randomized controlled trial involving 272 adult tetanus patients in Vietnam.
• * Measurement of 24-hour urinary adrenaline and noradrenaline via ELISA on day 5 of hospitalization.
• * Statistical analysis adjusted for confounders to assess relationships between catecholamines, cardiovascular parameters, and outcomes like ANSD and ICU length of stay.

Main Results:

• * Non-linear relationships were observed between urinary catecholamines and heart rate after adjusting for confounders.
• * Elevated adrenaline and noradrenaline levels were associated with the subsequent development of autonomic nervous system dysfunction (ANSD).
• * Catecholamine levels correlated with the length of intensive care unit (ICU) stay.

Conclusions:

• * Urinary catecholamine levels are significantly associated with autonomic nervous system dysfunction and clinical outcomes in severe tetanus.
• * Adrenaline and noradrenaline may serve as biomarkers for predicting ANSD and prolonged ICU stays in tetanus.
• * Further research is warranted to explore therapeutic implications of these findings.