SYSTOLIC TIME INTERVALS IN INTRATRACHEAL CARDIOGRAM

概要

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By means of a newly developed sensitive pressure transducer connected to the endotracheal tube of the anesthetized patient, small changes of air pressure through the airway caused by cardiogenic mechanical oscillations were recorded during apneic condition induced by succinylcholine chloride. This pressure recording was tentatively termed as an intratracheal cardio-gram (ITCG).This transducer has a high resonant frequency enough for precise record-ing of spike waves in ITCG caused by valvular movements.Some of the parameters calculated from the spike waves in ITCG with reference to ECG; i.e. QC, BC, QB, and QB/BC, were compared with such indices of systolic time intervals (STI) simultaneously obtained by the con-ventional non-invasive methods as EMS, LVET, PEP, and PEP/LVET. There are highly significant correlations between the corresponding param-eters and derivatives of the conventional and new methods. This technique is expected to be useful tool in assessing cardiac function during endotracheal intubation.
The Keio Journal of Medicineの論文