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[Paroxysmal vagal hypertonia in infants. Apropos of 14 cases]
Insights
This study found a strong link between oculocardiac reflexes (OCR) and Holter monitor findings in infants experiencing fainting spells. These results help diagnose vagal hyperreflexia, a condition that may be related to sudden infant death syndrome.
Area of Science:
- Pediatrics
- Cardiology
- Neurology
Background:
- Infants can experience unexplained episodes of weakness or fainting.
- Diagnosing the cause of these episodes, particularly vasovagal syncope, can be challenging in infants.
Purpose of the Study:
- To establish criteria for diagnosing vagal hyperreflexia in infants.
- To investigate the correlation between oculocardiac reflexes (OCR) and Holter monitor recordings in infants with fainting episodes.
Main Methods:
- Investigated 14 infants with unexplained fainting episodes using Holter monitoring and OCR.
- Compared recordings from affected infants with those from 10 normal children.
- Correlated OCR results with Holter monitor data, specifically minimal instantaneous frequency and maximal change in instantaneous frequency.
Main Results:
- A good correlation was observed between the duration of cardiac arrest during OCR and Holter-derived heart rate variability parameters.
- The study highlights diagnostic difficulties associated with vasovagal episodes in infants.
- Findings suggest a potential link between these episodes and sudden infant death syndrome (SIDS).
Conclusions:
- OCR and Holter monitoring are valuable tools for assessing vagal hyperreflexia in infants.
- Accurate diagnosis of vasovagal episodes in infants is crucial due to their potential severity.
- Further research is warranted to explore the relationship between these episodes and SIDS.
Abstract:
Fourteen infants presenting with unexplained episodes of weakness or fainting were investigated by repeated Holter monitor recordings and oculocardiac reflexes (OCR). The recordings were then compared with those of 10 normal children in order to try to establish the criteria of vagal hyperreflexia. Results of OCR were collated with those of Holter: there was a good correlation between the length of the cardiac arrest on the OCR and the minimal instantaneous frequency and the maximal change of instantaneous frequency recorded on the Holter. The diagnostic difficulties of these vaso-vagal episodes in infants are emphasized. The potential gravity of these episodes and the possible relation with the sudden infant death syndrome are then discussed in the light of these cases.