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

1. Patricia Reant1,*, 
2. Marina Dijos1, 
3. Erwan Donal2,3,4, 
4. Aude Mignot1, 
5. Philippe Ritter1,
6. Pierre Bordachar1, 
7. Pierre Dos Santos1, 
8. Christophe Leclercq2,3,4,
9. Raymond Roudaut1, 
10. Gilbert Habib5 and 
11. Stephane Lafitte1

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."

.