The study was approved by the local ethics committee, and in
agreement with the Helsinki II declaration written informed
consent was obtained in each case. Healthy (ASA I) patients
scheduled for thoracoscopic
sympathectomy for flushing syndrome
were asked to participate in the study, and all patients were
evaluated for presence of cardiac disease prior to anaesthesia.
Fourteen participants (12 f; 2 m) with a median age of
32.5 (range: 26–70) yr were successively enrolled
in the study. All participants were unmedicated and had no history
of previous cardiac illness. Preoperative cardiac risk assessment,
including ECG and chest X-ray, revealed no evidence of manifest
cardiac disease.
Transthoracic TDE image acquisition and subsequent analysis
was possible in all participants. Full TTS from apical four-
and two-
chamber views was not possible in four of 14 individuals,
mainly due to poor signal/noise ratio in apical segments.
Propofol anaesthesia induction resulted in significant attenuation
in blood pressure but no change in HR was observed (Table
1).
TDE variables (PSV, TTD, and TTS) declined significantly, whereas
TTP was unchanged (Table
1).
Limitations of the current study: As the primary objective was
to evaluate LV function by measuring myocardial velocities,
no LV area calculations were performed. TTS was attempted in
order to form the basis for comparison with currently used methods.
As noted, TTS was not possible in some patients; however, the
results from 10 patients were conclusive (
15.2% drop in ejection fraction) (P = 0.009). Similarly, as the study population consisted
of healthy patients undergoing short-duration minor surgery
no invasive pressures were coupled with TDE.
Propofol reduces tissue-Doppler markers of left ventricle function: a transthoracic echocardiographic study
J. R. Larsen1,2,*, P. Torp1, K. Norrild1 and E. Sloth1
1 Department of Anaesthesiology and Intensive Care
2 Department of Experimental and Clinical Research, Skejby Sygehus, Aarhus University Hospital, DK-8200 Aarhus N, Denmark