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[Functional maneuvers for the diagnosis of hypertrophic cardiomyopathies with and without left ventricular outflow
M Anselmino1, F Orzan, M Bobbio
1Istituto di Medicina e Chirurgia Cardiovascolare, Università degli Studi, Torino.
Insights
The Valsalva maneuver significantly increases pressure gradients in obstructive hypertrophic cardiomyopathy. This hemodynamic response helps differentiate it from other heart conditions, aiding accurate diagnosis.
Area of Science:
- Cardiology
- Cardiovascular Physiology
Background:
- Hypertrophic cardiomyopathy (HCM) is a complex cardiac condition.
- Accurate differentiation between obstructive and non-obstructive HCM is crucial for patient management.
- Hemodynamic criteria are commonly used but require validation.
Purpose of the Study:
- To evaluate the diagnostic utility of established hemodynamic criteria for distinguishing obstructive from non-obstructive hypertrophic cardiomyopathy.
- To assess the impact of provocative maneuvers on hemodynamic parameters in HCM.
Main Methods:
- Involved left and right heart catheterization in patients with hypertrophic cardiomyopathy (obstructive and non-obstructive forms), fixed subaortic stenosis, valvular aortic stenosis, and hypertensive heart disease.
- Measured pressure gradients and aortic pulse pressure under basal conditions and during provocative maneuvers (ventricular premature beat, Valsalva maneuver, amyl nitrite, isoproterenol).
Main Results:
- The Valsalva maneuver significantly increased the pressure gradient (p < 0.001) in obstructive HCM.
- Post-extrasystolic aortic pulse pressure significantly decreased (p < 0.001) in obstructive HCM.
- These hemodynamic responses were significantly distinct compared to other studied cardiac conditions.
Conclusions:
- Hemodynamic assessment, particularly the Valsalva maneuver and post-extrasystolic beat response, effectively differentiates obstructive HCM from other conditions.
- Strict criteria for non-obstructive HCM (gradient < 30 mmHg even after provocation) may lead to misclassification, potentially blurring the lines with secondary left ventricular hypertrophy.
Purpose Of The Study:
to assess the diagnostic value of the commonly adopted haemodynamic criteria for the diagnosis of obstructive and non-obstructive hypertrophic cardiomyopathy.
Patients:
16 cases of hypertrophic cardiomyopathy, 7 cases of the non-obstructive form, 16 fixed subaortic stenosis, 8 valvular aortic stenosis, and 7 cases of hypertensive heart disease.
Methods:
left and right heart catheterisation, with particular attention to the pressure gradient and to the aortic pulse pressure by means of simultaneous pressure recording from the left ventricle and aorta under basal conditions, after a ventricular premature beat, during the Valsalva manoeuvre, during amyl nitrite inhalation, and isoproterenol administration.
Results And Conclusion:
the Valsalva manoeuvre increases significantly (p < 0.001) the pressure gradient, and the aortic pulse pressure in the post-extrasystolic beat decreases significantly (p < 0.001) in patients with hypertrophic obstructive cardiomyopathy. This response is significantly different from that of the other 3 disease groups. If the non-obstructive form is defined by strict criteria (i.e. no gradient above 30 mmHg even after provocative manoeuvres), then it cannot be separated from other forms of secondary left ventricular hypertrophy.