Document Detail


Cardiovascular aspects of glossopharyngeal insufflation and exsufflation.
MedLine Citation:
PMID:  18251438     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Breath-hold divers use glossopharyngeal breathing to inhale above total lung capacity (glossopharyngeal insufflation, GI) or exhale below residual volume (glossopharyngeal exsufflation, GE). In these maneuvers, air is moved using glossopharyngeal rather than respiratory muscle activity. Four competitive divers performed several GI and GE maneuvers in sitting or standing position, while cardiovascular parameters were measured with a photoplethysmographic method; echocardiography was also performed during GE. During GI, the divers showed a 48% drop in mean arterial pressure (MAP) to 50 mmHg, with a 88% decrease in pulse pressure (PP), while heart rate (HR) increased by 36% to 103 beats/min and cardiac output (CO) dropped by 79% to 1.3 l/min. The increase in intrathoracic pressure during GI, measured in separate experiments, is probably responsible for these hemodynamic changes, by impeding venous return into the chest. Associated with the drop in MAP during GI were various neurological signs and symptoms, including dizziness, tunnel vision, involuntary twitching of facial muscles and one brief episode of loss of consciousness. During GE, initially MAP and PP increased by 36% and 61%, to 149 and 95 mmHg respectively; later HR decreased by 37% to 45 beats/min and CO dropped by 37% to 4.3 l/min. The early cardiovascular changes of GE may be related to a decrease in intrathoracic pressure, enhancing venous return, as shown by a 6 to 15% increase in end-diastolic diameter; later changes are similar to the responses to apnea at low lung volumes. Because of their hemodynamic effects, these breathing maneuvers should be performed with caution, particularly in the case of GI.
Authors:
J Novalija; P Lindholm; S H Loring; E Diaz; J A Fox; M Ferrigno
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Undersea & hyperbaric medicine : journal of the Undersea and Hyperbaric Medical Society, Inc     Volume:  34     ISSN:  1066-2936     ISO Abbreviation:  Undersea Hyperb Med     Publication Date:    2007 Nov-Dec
Date Detail:
Created Date:  2008-02-06     Completed Date:  2008-02-11     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9312954     Medline TA:  Undersea Hyperb Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  415-23     Citation Subset:  IM; S    
Affiliation:
Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.
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MeSH Terms
Descriptor/Qualifier:
Adult
Blood Pressure / physiology*
Cardiac Output / physiology*
Diving / physiology
Echocardiography
Exhalation / physiology*
Female
Heart Rate / physiology*
Humans
Inhalation / physiology*
Male
Pharyngeal Muscles / physiology*
Tongue / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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