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http://www.onlinejase.com/article/S0894-7317(15)00463-0/fulltext

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Head-to-Head Comparison of Global Longitudinal Strain Measurements among Nine Different Vendors

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Conclusion

Reproducibility of GLS measurements was good and in many cases superior to conventional echocardiographic measurements. The small but statistically significant variation among vendors should be considered in performing serial studies and reflects a reference point for ongoing standardization efforts.

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O uso do Strain se firma apesar das trapalhadas cometidas pelos fabricantes.

A variação entre aparelhos existe mas já não prejudica o uso do método.

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