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Comparison of clinical and hemodynamic assessment of cardiac disability
Insights
Clinical assessment of cardiac disability often mismatches hemodynamic status in patients with heart disease. This study found poor correlation between subjective symptoms and objective physiological measurements, highlighting potential discrepancies in patient evaluation.
Area of Science:
- Cardiology
- Clinical Physiology
Background:
- Cardiac disability is often assessed clinically using the New York Heart Association (NYHA) classification.
- Hemodynamic parameters provide objective physiological data on cardiac function.
Purpose of the Study:
- To compare clinical assessment of cardiac disability with hemodynamic measurements in patients with coronary artery or valvular heart disease.
- To evaluate the correlation between subjective clinical classification and objective physiological data.
Main Methods:
- 187 patients with NYHA class I-III coronary artery or valvular disease were studied.
- Arteriovenous oxygen content difference (CavO2), cardiac index (CI), pulmonary artery pressure (PAP), pulmonary artery wedge pressure (PAWP), pulmonary arteriolar resistance index (PARI), and heart rate (HR) were measured at rest and during exercise.
- Clinical NYHA class was compared with hemodynamic variables.
Main Results:
- Hemodynamic evaluation paralleled clinical assessment in only 19 instances at rest and 12 during exercise.
- Distinctions between NYHA classes based on hemodynamics were infrequent.
- Cardiac index (CI), pulmonary artery pressure (PAP), and arteriovenous oxygen content difference (CavO2) were the most useful hemodynamic variables; heart rate (HR) was not helpful.
- Correlation was strongest in mitral stenosis.
Conclusions:
- Subjective clinical assessment of cardiac disability may not accurately reflect underlying physiological derangement in patients with heart disease.
- Hemodynamic assessment offers a more objective measure of cardiac function compared to clinical classification alone.
- Discrepancies between clinical and hemodynamic evaluations highlight the need for comprehensive patient assessment.
Abstract:
Clinical versus hemodynamic assessment of cardiac disability was compared in 187 patients with either coronary artery or valvular disease classified using the New York Heart Association classification (excluding class IV). The following variables were analyzed during rest and exercise: arteriovenous oxygen content difference (CavO2), cardiac index (CI), pulmonary artery pressure (PAP), pulmonary artery wedge pressure (PAWP), pulmonary arteriolar resistance index (PARI) and heart rate (HR). 180 comparisons of variables were made. Hemodynamic evaluation paralleled clinical evaluation only 19 times during rest and 12 during exercise. There were 5 instances of clinical and hemodynamic distinction between class I and II, 14 between class I and III and 12 between class II and III. Correlation was best in mitral stenosis. The most useful variable was CI followed by PAP and CavO2. HR was not helpful. This study emphasizes that subjective clinical disability may not correlate with physiologic derangement in certain patients.