GUH-ICU&Anaesthesia Profile picture
Jun 22, 2021 11 tweets 7 min read Read on X
GUH - images in Anaesthesia and ICU:
In anticipation of our Level 2 echo tweetorial series

This is a zoomed image of a valve during a level 2 scan

1. Name the valve
Name the valve:
For bonus points -

Name the transthoracic echo view:
Answers:
1. Tricuspid Valve
2. Right Parasternal View

While the right parasternal view is essential for accurate quantification of aortic stenosis - subtle hand movements can give an an-face view of the tricuspid valve
To obtain the right parasternal view:

1. Lie the patient in the RIGHT lateral position with right hand under the head

2. Obtain the standard PLAX view in this position

3. Follow the path of the ascending aorta across the sternum

4. Rock medially + tail up Image
The probe now faces down the ascending aorta through the AV Image
Color doppler shows direction of flow toward the probe Image
The associated CW doppler signal is therefore above the baseline Image
Once the angle is identified with 2D and color doppler, the pedoff probe is then used to accurately assess gradients.

It is tricky to learn but worth the effort! Image

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More from @GUH_ICU_Anaesth

Apr 5, 2022
1/9
Tuesdays Tweetorial:
You are in cardiothoracic theatre doing a mitral valve replacement for severe MR

The anaesthetic consultant is doing a TOE and keeps saying 'PISA'

U know its in Italy but have no idea why he keeps saying it

What is PISA and why is it used?
2/9
PISA = Proximal Isovelocity Surface Area

Blood is ejected -> LA

It converges at the mitral regurgitant orifice it forming hemispheres -> different blood velocity in each hemisphere

RCCs that are equidistant from the orifice(in each hemisphere) travel at similar speed
3/9
Each hemisphere has a radius

The radius that matters for calculations is the one where aliasing occurs (where color changes from blue to red or red to blue)
Remember:
Blue: RCCs moving Away from probe
Red: Towards the probe
Read 9 tweets
Mar 15, 2022
Quiz answer:

1.Sir Austin Bradford Hill

2.The Bradford Hill Criteria – 1965

Guidelines to help assess whether an observed association between an exposure and an outcome is likely to be causal.

#FOAMed #MedTwitter
1.TEMPORALITY:

Exposure MUST occur before outcome
This is the only absolute criteria for proving a causal relationship

Reverse causality – when outcome occurs before exposure (can be an issue with cross sectional studies)
2.Strength of the association
Measured by Odds/risk or rate ratio
A strong association is unlikely to be affected by unrecognised bias/confounding
Read 7 tweets
Nov 16, 2021
ANSWER:
A patient is admitted hypotensive with E. Coli sepsis.

The consultant asks for gentamycin and adds:

"Please don't under-dose"

Why is the initial dose of gentamycin so important?
Gentamycin, like other aminoglycosides exhibit concentration dependent killing

The initial phase of rapid bacterial killing is induced
by passive ionic binding of the drug to bacterial lipopolysaccharide.

The killing rate is directly related to
initial drug concentration
A second phase of slower bacterial killing is associated with decreased energy-dependent uptake of the aminoglycoside

This rate is independent of the initial drug level
Read 5 tweets
Sep 28, 2021
1/8
You are asked to preoperatively assess a patient with known primary severe mitral regurgitation for an hip replacement

Which of the following new findings might result in you postponing surgery:

Dilated LV
Impaired LV sys fxn
Pulmonary HTN
New Afib Image
2/8

Answer:

Any/all of the above

If known severe MR – these are the NEW findings that should prompt you to speak to you friendly cardiologist colleagues Image
3/8

Valvular Heart Dx (VHD) AHA guidelines : Image
Read 9 tweets
Sep 14, 2021
1/13 - GUH Echo tweetorial:

The tricuspid regurgitation jet velocity shown was used in a critical care patient to estimate RV systolic pressure:
Vol control – tvol 420ml PEEP 10cmH20
Cardiovascular: MAP 67mmHg on Noradrenaline 0.3mcg/kg/min
2/13
His TRVmax is high:
Why should I not diagnose this patient with pulmonary hypertension in my echo report?

2 are correct:
a. not steady state
b. Off axis cursor
c. Echo cannot diagnose it
d. Poor 2D view
3/13
Answer:
a, c and possibly b!

Lets start with what TR vmax means and how it is calculated
Read 14 tweets
Sep 14, 2021
GUH Images in Anaesthesia and ICU:

The tricuspid regurgitation jet velocity shown was used in a critical care patient to estimate RV systolic pressure:

Vol control – tvol 420ml PEEP 10cmH20

Cardiovascular: MAP 67mmHg on Noradrenaline 0.3mcg/kg/min
His TR Vmax suggests his RV systolic pressure is 51mmHg + RA pressure = HIGH

I am conscious that I should not diagnose this patient with pulmonary hypertension in my echo report:

Why?
Read 4 tweets

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