Related Experiment Videos
Intracranial pressure and cerebral perfusion pressure in experimental streptococcus pneumoniae meningitis
1Department of Pediatrics and Clinical Microbiology, Hadassah University Hospital, Jerusalem, Israel.
Abstract:
Clinical studies have demonstrated the prognostic importance of increased intracranial pressure in central nervous system infections. To delineate development of intracranial pressure in meningitis experiments were carried out in rabbits. Meningitis was induced by injecting streptococcus pneumoniae bacteria into the cisterna magna and blood, and intracranial pressures were continuously recorded. In the experimental model, three stages were seen: incubation period (0-8 h)--in which CSF becomes positive for the infecting organism and biochemical changes occur, but there are no hemodynamic or intracranial pressure changes; stage of slowly increasing intracranial pressure - because blood pressure remains normal, cerebral perfusion pressure is maintained adequate for cerebral metabolic need (9-24 h); terminal stage (greater than 25 h)--with hemodynamic collapse, critical reduction of cerebral perfusion pressure, cerebral ischemia, and death of the experimental animals. It is suggested that a similar sequence occurs in human disease. The clinical implication stresses the need for early recognition and treatment of intracranial hypertension as an important adjunct to antibiotic treatment of the infecting organism.
Insights
Increased intracranial pressure in meningitis progresses through three stages in rabbits, from incubation to terminal collapse. Early recognition and treatment of intracranial hypertension are crucial for patient outcomes.
Area of Science:
- Neurology
- Infectious Diseases
- Physiology
Background:
- Clinical studies highlight the prognostic significance of elevated intracranial pressure in central nervous system infections.
- Understanding the temporal dynamics of intracranial pressure is vital for managing meningitis.
Purpose of the Study:
- To delineate the development of intracranial pressure during meningitis in an experimental animal model.
- To characterize the stages of intracranial pressure changes in bacterial meningitis.
Main Methods:
- Meningitis was induced in rabbits by injecting Streptococcus pneumoniae into the cisterna magna and blood.
- Intracranial pressure was continuously monitored throughout the experiment.
- Animals were observed through incubation, increasing intracranial pressure, and terminal stages.
Main Results:
- Three distinct stages were identified: incubation (0-8h), slowly increasing intracranial pressure (9-24h), and terminal stage (>25h).
- During the incubation stage, cerebrospinal fluid (CSF) became positive for bacteria, but no hemodynamic changes occurred.
- The terminal stage was characterized by hemodynamic collapse, reduced cerebral perfusion pressure, cerebral ischemia, and death.
Conclusions:
- The experimental model suggests a similar three-stage progression of intracranial pressure occurs in human meningitis.
- Early detection and management of intracranial hypertension are essential adjuncts to antibiotic therapy.
- Cerebral perfusion pressure maintenance is critical until the terminal stage of hemodynamic collapse.