Effect of dextran loading on left ventricular performance in chronic obstructive pulmonary disease

Area of Science:

• Cardiology
• Pulmonology
• Medical Imaging

Background:

• Left ventricular (LV) function in chronic obstructive pulmonary disease (COPD) is debated.
• Assessing LV function is crucial for managing COPD patients.

Purpose of the Study:

• To evaluate left ventricular function at rest and during volume loading in severe COPD patients.
• To clarify the impact of COPD on cardiac performance.

Main Methods:

• Radionuclide imaging was used to measure LV ejection fraction (LVEF), LV end-diastolic volume (LVEDVI), cardiac output, and stroke volume.
• Measurements were taken at rest and after intravenous dextran infusion in 23 men with severe COPD.

Main Results:

• Resting LVEF was normal in 19 patients with COPD alone; four with coexisting coronary artery disease had depressed LVEF.
• Resting LVEDVI and pulmonary capillary wedge pressure were normal, indicating no LV volume underload.
• Dextran infusion resulted in a normal LVEF response with significant increases in cardiac index, stroke volume index, LVEDVI, and PCW.

Conclusions:

• Left ventricular function appears normal at rest in most severe COPD patients.
• Volume loading with dextran does not impair LV function in this population.
• COPD itself, without coronary artery disease, may not compromise resting left ventricular performance.