Dyspnea index

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The dyspnea index provides information about the extent of shortness of breath in lung and cardiovascular diseases. Since dyspnea is by definition a subjective sensation, the classification is usually based on subjective criteria.

As a so-called ventilation efficiency or breathing reserve index , a relationship between breathing reserve (AR) and breathing limit value (AGW) is established. A result below 60 indicates the presence of resting dyspnea . The formula is:

AR times 100 / AGW

The Borg dyspnea index (the Borg scale) offers a visual analog scale in twelve levels as a classification scheme for the extent of subjective stress (from barely perceptible impairment to the most severe disability).

The Mahler Score or Mahler's Dyspnea Index is divided (according to Mahler et al. 1984) into a Baseline Dyspnea Index (BDI) and Transitional Dyspnea Index (TDI). The Modified Dyspnea Index introduces further criteria that suggest that the respiratory muscles have a significant influence on dyspnea.

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  1. Mahler et al .; The measurement of dyspnea. Contents, interobserver agreement, and physiologic correlates of two new clinical indexes. Chest. 1984 Jun; 85 (6): 751-8. PMID 6723384
  2. Stoller JK; Further specification and evaluation of a new clinical index for dyspnea. At Rev Respir Dis. 1986 Dec; 134 (6): 1129-34. PMID 3789515