Document Detail

Noninvasive myocardial contractility monitoring with seismocardiography during simulated dives.
MedLine Citation:
PMID:  12841605     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To determine if bradycardia during hyperbaric exposure is accompanied by a negative influence on myocardial contractility. METHODS: Accelerometer-based registration of myocardial compression waves with Seismocardiography (SCG) for noninvasive contractility monitoring. Comparative pulmonary artery (PA) catheter study (9 ICU-patients, mean = 67ys) with ejection-fraction (EF) equivalent versus sum of g-values of contraction phase in SCG, and Preload (leg-positioning). Test with monitoring of changes in Contractility Index (ContrI) derived from the SCG-power spectrum (contraction phases, area under curve). Hyperbaric chamber study (0.6MPa dive-simulation) in 14 healthy divers. Quantitative SCG-(ContrI, power spectra) and ECG-recording. RESULTS: Correlation between changes in EF (PA catheter) and in the g-values (SCG) was r(SP) = 0.87 (p < 0.0001). ContrI increased in the leg-positioning test parallel to preload increase, heart rate remained stable. During hyperbaric exposure (0.6MPa) heart rate decrease was highly significant (68 to 58 min(-1); p < 0.001), ContrI and power spectra remained nearly unchanged, SCG registration was noise free. CONCLUSIONS: Hyperoxic bradycardia during simulated dives is not accompanied by impaired contractility measured with SCG, which is concordant to findings with invasive methods in current literature. SCG is suitable for noninvasive and stress free contractility monitoring and patient surveillance in a hyperbaric chamber.
A Koch; P McCormack; A Schwanecke; P Schnoor; C Buslaps; K Tetzlaff; H Rieckert
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Undersea & hyperbaric medicine : journal of the Undersea and Hyperbaric Medical Society, Inc     Volume:  30     ISSN:  1066-2936     ISO Abbreviation:  Undersea Hyperb Med     Publication Date:  2003  
Date Detail:
Created Date:  2003-07-04     Completed Date:  2003-07-17     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  9312954     Medline TA:  Undersea Hyperb Med     Country:  United States    
Other Details:
Languages:  eng     Pagination:  19-27     Citation Subset:  IM; S    
German Naval Medical Institute, Kopperpahler Allee 120, 24119 Kronshagen, Germany.
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MeSH Terms
Atmosphere Exposure Chambers
Bradycardia / physiopathology*
Diving / physiology*
Heart Catheterization
Heart Function Tests / methods
Hyperbaric Oxygenation / adverse effects
Myocardial Contraction / physiology*
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