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[Oxygen transport function of the blood in ischemic heart disease]
Insights
Patients with ischemic heart disease show reduced hemoglobin-oxygen affinity, shifting the oxyhemoglobin curve rightward. This compensates for impaired oxygen delivery to the heart muscle, especially in severe cases.
Area of Science:
- Cardiology
- Physiology
- Biochemistry
Background:
- Ischemic heart disease (IHD) affects blood oxygen transport.
- Understanding hemoglobin-oxygen affinity is crucial for IHD management.
Purpose of the Study:
- To investigate blood oxygen transport in IHD patients.
- To analyze factors affecting hemoglobin-oxygen affinity in IHD.
Main Methods:
- Studied 40 IHD patients and 23 controls.
- Utilized angiography to assess coronary arteries.
- Analyzed oxygen transport indices and oxyhemoglobin dissociation curve.
Main Results:
- IHD patients exhibited decreased hemoglobin-oxygen affinity.
- Oxyhemoglobin dissociation curve shifted right and downward.
- Shifts correlated with lower blood pH and increased 2,3-diphosphoglycerate.
- More pronounced shifts observed in patients with poor exercise tolerance and severe coronary artery disease.
Conclusions:
- Rightward shift of the oxyhemoglobin dissociation curve in IHD is a compensatory mechanism.
- This shift aims to enhance oxygen delivery to the myocardium.
- The findings highlight the complex interplay of factors affecting oxygen transport in IHD.
Abstract:
Blood oxygen transport function was studied in 40 patients with ischemic heart disease and afflicted or intact cardiac coronary arteries (as demonstrated by angiography) and in 23 individuals of the control group. Analysis of indices characterizing oxygen transport in patients with ischemic heart disease revealed diminished affinity of hemoglobin for oxygen with a shift of the oxyhemoglobin dissociation curve to the right and downward. The shift of the oxyhemoglobin dissociation curve is due a decrease in blood pH and increase of the role of auxiliary factors, 2,3-diphosphoglycerate in patricular. The shifts in the curve were more marked in patients with poor physical load tolerance and affliction of the three main coronary arteries, which is an act of compensation aimed at improving oxygenation of the heart muscle.