APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -Tardus parvus refers to a pattern of Doppler ultrasound spectral waveform resulting from arterial stenosis. The phenomenon is observed downstream to the site of stenosis, and is due to reduced magnitude of blood flow through the narrowed vessel during ventricular systole 7.

Detailed explanation-2: -Pulsus parvus et tardus refers to a late (relative to heart contraction), weak pulse, which is commonly felt during a physical examination of an individual with aortic valve stenosis. Pulse, or heart rate, is the number of heartbeats per minute.

Detailed explanation-3: -Abstract. The Doppler linear flow velocity versus time spectrum obtained in an arterial flow system in which there is proximal occlusive disease with or without collateral formation has a tardus-parvus waveform. The conditions that cause this Doppler sign are due to a poststenotic pressure drop.

Detailed explanation-4: -Waveform Changes in Systole During carotid Doppler sonography, the parvus–tardus waveform is characterized by a small, smooth, and rounded systolic peak and is observed distal to severe atherosclerotic stenoses in approximately 91% of cases [1].

Detailed explanation-5: -Tardus parvus is the waveform appearance in which the systolic upstroke is delayed. This waveform shape is indicative of severe, proximal, or inflow, disease.