Pulse Transit Time in Anesthetized Ventilated Patients: Affect of Blood Pressure or Cardiac Output as Measured With NICOM Monitor

Background Pulse transit time (PuTT) - the time between R wave on ECG and initiation of upstroke in the peripheral arterial waveform - described in the previous studies as value that reflects changes in both blood pressure and blood volume. We are assuming that PuTT changes reflect the dynamic of systolic blood pressure but not cardiac output fluctuations.

Clinical trial objectives Investigate a link between PuTT (Pulse transit time) and changes in blood pressure and cardiac output measured by non-invasive cardiac output monitoring device (NICOM).

Endpoints PuTT Blood pressure: systolic, diastolic, mean Heart rate Cardiac output-Index Systemic vascular resistance-Index

Prospective nonrandomized clinical trial

Inclusion criteria Need for continuous invasive monitoring of blood pressure - according to the type of surgery the patient's health status Normal sinus rhythm