Background:

Sepsis has been associated with high mortality and cardiac dysfunction, echocardiography is technically difficult, depends on the operator, requires trained personnel and available equipment, so the Smith & Madigan formula (SMII) through the cardiac output monitor Ultrasonic is an adequate substitute of inotropism, being able to infer the final end-diastolic volume of the left ventricle (VDFVI) as indicator of preload.

Methods:

In 56 patients diagnosed with septic shock, the following formulas were measured by an ultrasonic cardiac output monitor and compared with final end-diastolic volume by echocardiography.

SMII = (VS × (PAM-PVC + Gp))/(7.5 × SC × TF)

VDFVI = VS × 2.7/SMII.

Results:

We compared the results measured by echocardiography and the Smith & Madigan formula, using the Bland & Altman method, we obtained an R2 = 0.92, a Linn coefficient of 0.92 with an LC95% higher 32.45, LC95% Lower - 39.45 and a 32% error rate.

Conclusion:

The Smith & Madigan formula could be useful for the calculation of final end-diastolic volume of the left ventricle. Although the percentage of error is greater than 20%, we must determine if this measure is useful for making clinical decisions.

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