Causes of Narrow Pulse Pressure

Cardiovascular Causes

The American Heart Association notes that cardiogenic shock, characterized by reduced cardiac contractility, leads to decreased stroke volume and narrowed pulse pressure, often with signs of hypoperfusion including cool extremities, altered mentation, and Cheyne-Stokes respiration 1, 2
The European Society of Cardiology recommends considering severe aortic stenosis and hypertrophic obstructive cardiomyopathy as causes of narrowed pulse pressure due to reduced stroke volume 4
The American College of Cardiology states that heart failure decompensation, especially in advanced stages with reduced cardiac index (<2 L/min/m²), can cause narrowed pulse pressure as stroke volume decreases 3

Dehydration, characterized by reduced intravascular volume, decreases ventricular filling and stroke volume, according to the American Heart Association 3

Constrictive pericarditis restricts ventricular filling, reducing stroke volume, as noted by the American Heart Association 3

The European Society of Cardiology states that pulmonary embolism can lead to acute right ventricular afterload increase, resulting in RV failure and decreased left ventricular preload, reducing cardiac output 5
Pulmonary hypertension, characterized by chronic elevation of pulmonary vascular resistance, increases right ventricular afterload, eventually leading to RV failure and reduced cardiac output, according to the European Society of Cardiology 4
Tension pneumothorax impairs venous return and cardiac filling, as noted by the American Heart Association 1

The Society of Critical Care Medicine notes that septic shock can present with narrow pulse pressure in its early distributive phase before vasodilation predominates 6
Valvular heart disease, such as mitral stenosis or atrial myxoma, can cause left ventricular inflow obstruction, reducing stroke volume, according to the European Society of Cardiology 7
Right ventricular outflow tract obstruction can reduce cardiac output, as stated by the European Society of Cardiology 4
The American College of Cardiology recommends considering arrhythmias, particularly tachyarrhythmias, as a cause of reduced ventricular filling time and stroke volume 8

The American Heart Association notes that narrow pulse pressure correlates strongly with cardiac index when CI is <2 L/min/m², making it a useful clinical indicator of significantly reduced cardiac output 1
Assessment of other clinical signs of hypoperfusion, such as cool extremities, altered mentation, and elevated lactate, should accompany evaluation of narrow pulse pressure, as recommended by the American Heart Association 1

The American Heart Association recommends evaluating for signs of volume depletion, such as postural hypotension, dry mucous membranes, and reduced skin turgor 3
The American College of Cardiology states that assessing jugular venous distention and hepatojugular reflux can help evaluate right-sided filling pressures 2
Consideration of echocardiography to evaluate cardiac function, valvular disease, pericardial effusion, and right ventricular size/function is recommended by the American College of Cardiology 8