What does resistive index indicate?
The resistive index (Pourcelot index) is a calculated flow parameter in ultrasound, derived from the maximum, minimum, and mean Doppler frequency shifts during a defined cardiac cycle. Along with the pulsatility index (PI), it is typically used to assess the resistance in a pulsatile vascular system.
What is a normal resistive index in the hepatic artery?
The hepatic artery is normally a low-resistance vessel, meaning it should have an RI ranging from 0.55 to 0.7.
How do you calculate the RI of the hepatic artery?
RI is calculated with the following formula: (Peak systolic velocity – End diastolic velocity)/Peak systolic velocity. The RI increases as the diastolic flow in the hepatic artery decreases. The RI will approach 1.0 when diastolic flow is absent or near absent.
What is a normal hepatic artery velocity?
In normal patients, the hepatic artery is a low-resistance systemic artery with low-resistance monophasic waveforms. Peak systolic velocities approximate 100 cm/sec.
What does a high resistive index mean?
The renal resistive index is a nonspecific prognostic marker in vascular diseases that affect the kidney. High resistive indices (>0.8) in native kidneys are associated with renal dysfunction and adverse cardiovascular events 7,8.
What does elevated resistive index mean?
Strengths: Increased renal resistive index (RRI) is a marker of atherosclerotic and hypertensive organ damage both at the renal and systemic level. It is a predictor of cardiovascular and renal outcome.
What does red and blue mean on liver ultrasound?
The red color on the screen is usually set up in most devices as the direction of flow towards the probe, while the blue color indicates the direction of blood flow is away from the probe.
What are resistive indices in kidneys?
Renal resistive index (RRI), calculated as (peak systolic velocity−end-diastolic velocity)/peak systolic velocity, is a noninvasive measure obtained from a renal Doppler study to investigate renal hemodynamics.
When should I worry about Alt?
High levels of ALT may indicate liver damage from hepatitis, infection, cirrhosis, liver cancer, or other liver diseases. Other factors, including medicines, can affect your results. Be sure to tell your health care provider about all the prescription and over-the counter medicines you are taking.
Does portal hypertension go away?
Unfortunately, most causes of portal hypertension cannot be treated. Instead, treatment focuses on preventing or managing the complications, especially the bleeding from the varices. Diet, medications, endoscopic therapy, surgery, and radiology procedures all have a role in treating or preventing the complications.
Can you reverse renal artery stenosis?
Treatment for renal artery stenosis may involve lifestyle changes, medication and a procedure to restore blood flow to the kidneys. Sometimes a combination of treatments is the best approach. Depending on your overall health and symptoms, you may not need any specific treatment.
What does a high PI mean?
Uterine artery PI provides a measure of uteroplacental perfusion and high PI implies impaired placentation with consequent increased risk of developing preeclampsia, fetal growth restriction, abruption and stillbirth. The uterine artery PI is considered to be increased if it is above the 90th centile.