segunda-feira, novembro 22, 2010

Rápido e simples. Acessível a todos os aparelhos.

Systolic time intervals as simple echocardiographic parameters of left ventricular systolic performance: correlation with ejection fraction and longitudinal two-dimensional strain

Systolic time intervals

Based on pulsed Doppler aortic acquisitions, STI were obtained: 
aortic pre-ejectional period (PEP: delay from Q wave of QRS to aortic
 valve opening, ms) and LV ejection time (LVET, ms). In simple terms, 
PEP is the interval from the onset of ventricular depolarization to the 
beginning of aortic ejection. LVET represents the interval from beginning
 to termination of aortic flow. PEP/LVET ratio was also calculated.
Conclusion STI can be easily and accurately measured in 
clinical practice, and may be used for detecting alterations
 in LV systolic function. Moreover, this method is likely to
 have potential applications in the management of HF patients.
Tudo que é simples é melhor?
Parece que nesse caso é verdade.
Veja a variação entre as medidas, maior defeito de outros
 métodos que avaliam fração de ejeção:
"mean intra-observer variability was 7.6% for PEP, and 4.3% for LVET."

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