Peak systolic velocity

Using three-dimensional color Doppler sonography, Fleischer et al. [36] found that hypervascular fibroids tend to decrease in size after UFE more than their isovascular or hypovascular fibroids. McLu-CAS et al. [15] showed that the initial peak systolic velocity was positively correlated with the shrinkage of fibroids and uterine volume reduction. 

Sexual function Unilateral intracavernosal papaverine was associated with increased blood flow and increased cavernosal artery peak systolic velocity on the side of the injection compared with bilateral administration and 5 of 60 patients developed priapism, which was managed successfully with aspiration of blood and irrigation of the corpus cavemosum with isotonic saline [162%... 

Tissue Doppler imaging (TDI) which is a feature in some of the newer echo machines is a promising approach to assess dyssynchrony. It measures the time to peak systolic velocity (from the onset of QRS complex) in different segments of the LV and the delay between them is used as a marker of LV dyssynchrony (Fig. 11.6). These measurements can be obtained by pulsed-wave TDI or color-coded TDI that requires postprocessing. Initial studies used... 

In place of intracavernosal injection to examine patients with erectile dysfunction intraurethral instillation of prostaglandin El at the dose of 0.5 mg has been proposed as an alternative method to reduce the distress connected to the direct injection (Tam et al. 1998). Although the urethral mucosa is not the best route of drug transfer, its anatomical structure with numerous submucosal veins that communicate between the corpus spongiosum and the corpora cavernosa can be considered an alternative way to induce erection. Color Doppler parameters and specifically peak systolic velocity (PSV) measured the increase statistically, and in about 65% erections sufficient for intercourse were obtained. The transurethral administration of prostaglandin El has shown a positive effect in the treatment of a substantial proportion of men with chronic erectile dysfunction, but the procedure is not suitable to define the nature and the severity of it (Padma-Nathan et al. 1997). 

There is a general agreement that the peak systolic velocity (PSV) measured at the level of the peno-scrotal junction is the best parameter for a clinical judgment of the arterial perfusion (Oates et al. 1995). PSV above 35 cm/s is considered the... 

Veno-occlusive erectile dysfunction is more common in clinical practice and is usually observed in younger patients without arterial disease. As confirmed by cavernosography and cavernosomanom-etry (Kropman et al. 1992), the diagnosis is made on the basis of a high and persistent peak systolic velocity, which is superior to the cut-off values of 35 cm/s, and end diastolic velocity (Fig. 6.12) with a sensitivity of 90-94%. 

Postraumatic penile arterial obstruction characteristically involves the proximal portion of the dorsal penile and cavernosal arteries and the distal internal pudendal artery at the level of the urogenital diaphragm. The integrity of arterial vascular supply to the penis can be assessed by Doppler interrogation of the cavernosal arteries. A peak systolic velocity of 25 cm/s or less after prostaglandin El intracavernosal injection reflects arterial insufficiency (Fig. 12.11). 

Diffuse fibrotic changes of the corpora cavernosa are invariably associated with erectile dysfunction. Even after cavernosal administration of high prostaglandin doses, incomplete erection is reached. Doppler interrogation of the cavernosal arteries usually shows pathological waveform changes in these patients consistent with veno-occlusive dysfunction. Peak systolic velocity is variable, depending of the... 

The V2A 1 from the equation, where V2 is the peak systolic velocity (PSV) at the stenotic segment and VI the PSV at the normal diameter... 

The flow pattern in the main pulmonary artery differs between normals and patients with pulmonary hypertension. The latter have lower peak systolic velocity and greater retrograde flow during end systole. 

Fig. 3.18a-c. Renal artery stenosis, a On color flow sonography, an aliasing phenomenon is present at the proximal portion of the renal artery (arrow). bThe spectral waveform shows an increased peak systolic velocity (2.8 m/s) with spectral broadening. On the intrarenal interlobar arteries, the ascension time is increased at 127 ms. c Gd-enhanced MR angiography confirms the post-ostial renal artery ste-... 

The Doppler spectrum of the normal hepatic artery shows low vascular resistance and continuous diastolic flow there is a rapid systolic upstroke with acceleration time inferior to 80 ms the resistive index [(peak systolic velocity - peak diastolic veloc-ity)/peak systolic velocity] should be between 0.5 and 0.7 (Crossin et al. 2003) (Fig. 4.2.17). Doppler criteria for diagnosing a significant hepatic artery complication are peak systolic velocities greater than 200cm/s, focal increase in velocity greater than threefold, resistive index less than 0.5, and acceleration time greater than 80 ms (tardus-parvus... 

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