Key result
TEE during graded supine bicycle exercise successfully evaluates LV performance and detects increased fractional shortening.
Why the study?
Evaluation of left ventricular function during dynamic exercise using transoesophageal M-mode echocardiography had not been established in normal subjects.
Does transoesophageal M-mode echocardiography effectively evaluate left ventricular performance during dynamic exercise in healthy subjects?
Observational (n=12)
Does transoesophageal M-mode echocardiography effectively evaluate left ventricular performance during dynamic exercise in healthy subjects?
Transoesophageal M-mode echocardiography is a feasible and useful method for evaluating left ventricular performance during dynamic exercise.
Answers are grounded in this paper and cite their sources.
Supports feasibility of transoesophageal M-mode echocardiography for LV assessment during exercise; leaves open clinical utility pending validation.
In order to evaluate left ventricular function during dynamic exercise transoesophageal M-mode recordings of the left ventricle were carried out with a newly developed transducer gastroscope system. Twelve healthy subjects performed a graded supine bicycle exercise test. Stable and good quality images of the left ventricle at rest and during exercise at different steps up to a maximum workload of 100 watts were obtained in all patients. Isotonic maximum exercise resulted in a significant increase in fractional shortening of the left ventricle, peak shortening rate, and peak lengthening rate of the left ventricular minor axis. Left ventricular end-diastolic dimension decreased significantly. With increasing workload the pressure rate product increased significantly. It is concluded that transoesophageal M-mode echocardiography is a useful method of evaluating left ventricular performance during dynamic exercise.
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Matsumoto et al. (1982) conducted an observational in Healthy subjects (n=12). Graded supine bicycle exercise test vs. Rest was evaluated on Left ventricular performance (fractional shortening, peak shortening rate, peak lengthening rate, end-diastolic dimension). Transoesophageal M-mode echocardiography during graded supine bicycle exercise up to 100 watts successfully evaluated left ventricular performance, showing significant increases in fractional shortening.
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