Measuring lung water following major lung resection

Area of Science:

• Cardiovascular Physiology
• Pulmonary Medicine
• Surgical Critical Care

Background:

• Lung resection surgery causes acute hemodynamic changes.
• Accurate monitoring of fluid balance is crucial in postoperative care.
• Extravascular lung water index (EVLWI) is a key indicator of lung injury.

Purpose of the Study:

• To determine if the intrathoracic blood volume (ITBV) to global end diastolic volume (GEDV) ratio is constant after lung resection.
• To validate the use of single thermo dilution (STD) technique for EVLWI measurement in this patient group.

Main Methods:

• Four patients undergoing major lung resection surgery were monitored.
• Extravascular lung water index (EVLWI) was measured using both double dye technique (DDT) and single thermo dilution (STD).
• Measurements were taken for up to 12 hours post-surgery.

Main Results:

• The ITBV/GEDV ratio showed minimal variation for up to 12 hours after the initial 2 hours post-surgery.
• EVLWI measurements by STD showed good correlation with DDT measurements.
• This suggests STD is a reliable method for EVLWI assessment in this context.

Conclusions:

• The ITBV/GEDV ratio is relatively stable following lung resection surgery.
• Single thermo dilution (STD) technique is a potentially valid method for measuring EVLWI post-lung resection.
• Accurate EVLW assessment may aid in managing postoperative acute lung injury.