Tardus parvus

Dr Yuranga Weerakkody and Dr Henry Knipe et al.

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.

This characteristic pattern is useful in assessing for renal artery stenosis. The pattern can also be seen distal to other sites of arterial stenosis (e.g. hepatic arterial stenosis), as well as within collateral vessels following an arterial occlusion 7.

Radiographic features

  • tardus: prolonged systolic acceleration (i.e. slow upstroke)
  • parvus: small systolic amplitude and rounding of systolic peak
Ultrasound - general index
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Article information

rID: 43541
System: Vascular
Section: Radiography
Tag: cases
Synonyms or Alternate Spellings:
  • Pulsus parvus et tardus
  • Tardus-parvus waveform
  • Tardus-parvus

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Cases and figures

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    Figure 1
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    Case 1: in renal artery stenosis
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    Case 2
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