Shock index

The shock index is the quotient of heart rate (beats per minute) and systolic blood pressure (measured in mmHg; represented as RR ). In a shock patient, it should serve as an orienting parameter for assessing the circulatory situation . However, the shock index does not allow a reliable assessment of a patient; it is regarded as obsolete. In practice, however, it is still widespread and known as a term.

calculation

Shock index = . ${\displaystyle \mathrm {\frac {Herzfrequenz}{RR_{syst}}} }$

The dimension unit of the shock index is according to the way it is calculated , but in practice it is usually given without a dimension. ${\displaystyle \mathrm {\frac {1}{(mmHg*min)}} }$

The shock index in healthy people is usually between 0.4 and 0.7. With a pulse of 70 / min and a blood pressure of 140/80 mmHg, the calculated quotient is 70/140 = 0.5. A shock should be diagnosed by a quotient greater than 1, for example with a pulse of 140 / min ( tachycardia ) and a blood pressure of 80/50 mmHg ( hypotension ): shock index = 140/80 = 1.75.

rating

Blood loss cannot be adequately assessed using the parameters used, as a volume loss of up to around 30% is usually compensated for by the activation of the sympathetic nervous system and blood loss is underestimated. A slow heartbeat ( bradycardia ) can also occur initially , which makes the shock index appear normal. The shock index for estimating blood loss has therefore been obsolete for several years.

Individual evidence

1. ^ J. Nolan: Fluid resuscitation for the trauma patient. In: Resuscitation. 48 (1), Jan 2001, pp. 57-69. PMID 11162883
2. ↑ K. Mackway-Jones, BA Foëx, E. Kirkman, RA Little: Modification of the cardiovascular response to hemorrhage by somatic afferent nerve stimulation with special reference to gut and skeletal muscle blood flow. In: The Journal of Trauma . 47 (3), Sep 1999, pp. 481-485. PMID 10498301
3. ↑ L. Riddez, RG Hahn, B. Brismar, A. Strandberg, C. Svensén, G. Hedenstierna: Central and regional hemodynamics during acute hypovolemia and volume substitution in volunteers. In: Crit Care Med. 25 (4), Apr 1997, pp. 635-640. PMID 9142028 .

This article is about a health issue. It is not used for self-diagnosis and does not replace a diagnosis by a doctor. Please note the information on health issues !