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Systolic time intervals in burn injury
Acta Physiologica Hungarica
|January 1, 1987
Summary
Systolic time intervals reveal characteristic cardiac electrodynamic changes in burn patients, particularly during the first week post-injury. Severe burns are linked to prolonged QTc intervals and inadequate oxygenation, impacting cardiac function.
Area of Science:
- Cardiology
- Burn Medicine
- Physiology
Background:
- Burn injuries significantly impact physiological parameters.
- Understanding cardiac function in burn patients is crucial for management.
- Systolic time intervals (STI) offer insights into cardiac performance.
Purpose of the Study:
- To investigate systolic time intervals in young burn patients.
- To correlate cardiac function parameters with burn severity and time since injury.
- To identify characteristic electrodynamic changes in burn patients.
Main Methods:
- Studied 28 burn patients (TBS 10-90%) on 145 occasions.
- Recorded ECG, phonocardiogram (PCG), and carotid pulse tracings.
- Measured and calculated various systolic time intervals and derived parameters using computer analysis.
Main Results:
- Elongated QTc intervals and frequent electrodynamic failure (QT-QS2 > 40 msec) were characteristic in severe burns, especially in the first post-injury week.
- Reduced stroke volume (SV) correlated with burn extent and shortened deceleration time (DT).
- Inadequate oxygenation (EVR < 0.8) in severe burns inversely correlated with heart rate (HR), while increased contractility was suggested by high LVET/ICT ratio and shortened ICT.
Conclusions:
- Systolic time intervals provide valuable diagnostic information in burn patients.
- Electrodynamic abnormalities are prominent in severe burn injuries.
- Cardiac performance, including contractility and oxygenation, is significantly affected by burn severity.