Case Report

Correlation between T-Wave Alternans and Cardiac Volume Status via Intrathoracic Impedance Measurements

Figure 1

Representative data during period of clinical stability. (a) represents fluid index over time based on change in intrathoracic impedance measurements. Values beyond 60 are considered to be threshold for fluid overload. (b) represents actual intrathoracic impedance measurements over time. The solid line represents the baseline value for the patient. Lower diagrams (c and d) are T-wave alternans test data for different leads. Intrathoracic impedance values are mainly at baseline and no sustained T-wave alternans is present on a test conducted toward the end of this time period.
167562.fig.001a
(a)
167562.fig.001b
(b)
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(c)
167562.fig.001d
(d)