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Observations on the relationship between digital heat loss and systemic hemodynamics in patients with heart disease
Insights
Finger heat discharge significantly correlates with key hemodynamic measures in heart disease patients. Reduced heat discharge indicates worsening heart failure, impacting circulation and patient outcomes.
Area of Science:
- Cardiology
- Physiology
Background:
- Systemic hemodynamics are crucial indicators of cardiovascular health.
- Finger heat discharge reflects peripheral circulatory function.
Purpose of the Study:
- To investigate the relationship between finger heat discharge and systemic hemodynamic parameters in patients with heart disease.
- To assess the impact of heart failure on finger heat discharge.
Main Methods:
- Concomitant study involving 19 heart disease patients.
- Measurement of finger heat discharge using calorimetry.
- Correlation analysis with various hemodynamic parameters (e.g., circulation time, cardiac index, vascular resistance).
Main Results:
- Significant correlations found between finger heat discharge and mean circulation time, cardiac index, systemic vascular resistance, stroke work index, pulmonary artery pressure, pulmonary capillary wedge pressure, stroke index, appearance time, and mean right atrial pressure.
- No significant correlation observed with mean arterial blood pressure, LV dp/dtmax, or heart rate.
- Mean finger heat discharge was significantly diminished in patients with evidence of forward and/or backward heart failure, decreasing further when both were present.
Conclusions:
- Finger heat discharge is a sensitive indicator of systemic hemodynamic status in heart disease.
- Diminished finger heat discharge is associated with heart failure, reflecting impaired circulatory function.
Abstract:
A concomitant study of finger heat discharge and systemic hemodynamics was undertaken in a series of 19 patients (mean age 54 years) suffering from various forms of heart disease. Finger heat discharge, as measured by calorimetry, was found to correlate significantly with mean circulation time (-0.760), cardiac index (+0.649), systemic vascular resistance (-0.615), stroke work index (+0.649), mean pulmonary artery pressure (-0.596), mean pulmonary capillary wedge pressure (-0.554), stroke index (+0.541), appearance time (-0.502) and mean right atrial pressure (-0.453). There was no significant correlation between finger heat discharge and mean arterial blood pressure, LV dp/dtmax, and heart rate. An effect of heart failure on finger heat discharge was found. When evidence of forward failure and also possibly backward failure was found, mean finger heat discharge was significantly diminished. When both forward and backward failure were present together, mean finger heat discharge fell still further.