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## Revista chilena de cardiología

*versión On-line* ISSN 0718-8560

#### Resumen

RODRIGUEZ, Javier et al. Evaluation of 19-hour holter recordings in the context of probability theory.* Rev Chil Cardiol* [online]. 2019, vol.38, n.1, pp.20-28.
ISSN 0718-8560. http://dx.doi.org/10.4067/S0718-85602019000100020.

Background:

a new method to help evaluate 21-hour holter recordings based on dynamic systems and the theory of probability was previously developed Aim: to evaluate the diagnostic value of this methodology in the analysis of 19 hr compared to conventional holter analysis over a 21-hr recording.

Methods:

the holter recordings of 80 subjects aged over 20 years old were analyzed. Ten subjects had a normal holter and 70 conventionally diagnosed as abnormal. Ranges for heart rate and number of beats in 21 or 19 hours were determined. The probability of their occurrence was calculated using 3 parameters. The mathematically derived diagnosis was compared to the clinical diagnosis, considered a gold standard.

Results:

Among normal cases the calculated probability was ≤ 0.217 in 2 cases and ≥0.304 in 8. No case with acute disease presented probability values ≤0.217; all had probability values ≥0.304, both in 21 and 19 hour recordings.

Conclusion:

the mathematical methodology described was clinically useful allowing a reduction in recording time from 21 to 19 hr. Clinical diagnosis may be inferred from the mathematical organization of a holter recording.

**Palabras clave
:
**holter recording; heart rate; probability theory.