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

References

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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

Figure 1Figure 1

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Case 1: in renal artery stenosis Case 1: in renal artery stenosis

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Case 2Case 2

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