Abstract
The COPD patient during tidal breathing has to overcome an increased load: besides the "threshold" load of PEEPi and the resistive load of stenotic airways he has an increased elastic work since the overinflated lung is less distensible, being on the steeper portion of the pressure/volume curve. With respect to force, hyperinflation flattens the diaphragm and shortens the apposition zone fibers, with a consequent reduction of the diaphragm force capacity, due to a disadvantageous force/length relation. During exacerbations, the increase in respiratory rate shortens the time available for lung emptying with consequent worsening of dynamic hyperinflation (DH) and this places the diaphragm in a more disadvantageous position, reducing its forcegenerating capacity. Therefore indirect indexes of DH, like inspiratory capacity (IC), and of reduced diaphragmatic force, like maximal inspiratory pressure (Pi max) can better describe the pathophysiologic changes during exacerbations. Hypoxia is caused by worsening of ventilation/perfusion ratio, while hypercapnia is the consequence of ventilatory pump failure and alveolar hypoventilation.
| Original language | Italian |
|---|---|
| Pages (from-to) | 103-111 |
| Number of pages | 9 |
| Journal | Acta Anaesthesiologica Italica / Anaesthesia and Intensive Care in Italy |
| Volume | 59 |
| Issue number | 2 |
| Publication status | Published - 2008 |
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ASJC Scopus subject areas
- Anesthesiology and Pain Medicine
Cite this
Patofisiologia dell'insufficienza respiratoria durante esacerbazione della COPD. / Ceriana, Piero.
In: Acta Anaesthesiologica Italica / Anaesthesia and Intensive Care in Italy, Vol. 59, No. 2, 2008, p. 103-111.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Patofisiologia dell'insufficienza respiratoria durante esacerbazione della COPD
AU - Ceriana, Piero
PY - 2008
Y1 - 2008
N2 - The COPD patient during tidal breathing has to overcome an increased load: besides the "threshold" load of PEEPi and the resistive load of stenotic airways he has an increased elastic work since the overinflated lung is less distensible, being on the steeper portion of the pressure/volume curve. With respect to force, hyperinflation flattens the diaphragm and shortens the apposition zone fibers, with a consequent reduction of the diaphragm force capacity, due to a disadvantageous force/length relation. During exacerbations, the increase in respiratory rate shortens the time available for lung emptying with consequent worsening of dynamic hyperinflation (DH) and this places the diaphragm in a more disadvantageous position, reducing its forcegenerating capacity. Therefore indirect indexes of DH, like inspiratory capacity (IC), and of reduced diaphragmatic force, like maximal inspiratory pressure (Pi max) can better describe the pathophysiologic changes during exacerbations. Hypoxia is caused by worsening of ventilation/perfusion ratio, while hypercapnia is the consequence of ventilatory pump failure and alveolar hypoventilation.
AB - The COPD patient during tidal breathing has to overcome an increased load: besides the "threshold" load of PEEPi and the resistive load of stenotic airways he has an increased elastic work since the overinflated lung is less distensible, being on the steeper portion of the pressure/volume curve. With respect to force, hyperinflation flattens the diaphragm and shortens the apposition zone fibers, with a consequent reduction of the diaphragm force capacity, due to a disadvantageous force/length relation. During exacerbations, the increase in respiratory rate shortens the time available for lung emptying with consequent worsening of dynamic hyperinflation (DH) and this places the diaphragm in a more disadvantageous position, reducing its forcegenerating capacity. Therefore indirect indexes of DH, like inspiratory capacity (IC), and of reduced diaphragmatic force, like maximal inspiratory pressure (Pi max) can better describe the pathophysiologic changes during exacerbations. Hypoxia is caused by worsening of ventilation/perfusion ratio, while hypercapnia is the consequence of ventilatory pump failure and alveolar hypoventilation.
KW - Chronic obstructive pulmonary disease
KW - Exacerbation
KW - Respiratory failure
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M3 - Articolo
AN - SCOPUS:49549118675
VL - 59
SP - 103
EP - 111
JO - Acta Anaesthesiologica Italica / Anaesthesia and Intensive Care in Italy
JF - Acta Anaesthesiologica Italica / Anaesthesia and Intensive Care in Italy
SN - 1124-8882
IS - 2
ER -