Volumetric and End-Tidal Capnography for the Detection of Cardiac Output Changes in Mechanically Ventilated Patients Early after Open Heart Surgery.

ABSTRACT:

Background

Exhaled carbon dioxide (CO₂) reflects cardiac output (CO) provided stable ventilation and metabolism. Detecting CO changes may help distinguish hypovolemia or cardiac dysfunction from other causes of haemodynamic instability. We investigated whether CO₂ measured as end-tidal concentration (EtCO₂) and eliminated volume per breath (VtCO₂) reflect sudden changes in cardiac output (CO).

Methods

We measured changes in CO, VtCO₂, and EtCO₂ during right ventricular pacing and passive leg raise in 33 ventilated patients after open heart surgery. CO was measured with oesophageal Doppler.

Results

During right ventricular pacing, CO was reduced by 21% (CI 18-24; p < 0.001), VtCO₂ by 11

SUBMITTER: Hoff IE 

PROVIDER: S-EPMC6589280 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature