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Nick Mark MD

@nickmmark

Jan 22

🚨Apparently all NIH Study Sections have been suspended indefinitely.

For those who don’t know, this means there won’t be any review of grants submitted to NIH

Depending on how long this goes on for, this could lead to an interruption in billions in research funding.

With a budget of ~$47.4B, the NIH is by far the biggest supporter of biomedical research worldwide.

Grants are reviewed periodically by committees of experts outside of the NIH.

When these study sections are cancelled, it prevents grants from being reviewed & funded.

Hopefully this interruption will be brief (days)

A longer interruption in study sections (months) will inevitably cause an interruption in grant funding. This means labs shutdown, researchers furloughed/fired, & clinical trials suspended. This will harm progress & patients!

Read 8 tweets

Nick Mark MD

@nickmmark

Oct 13, 2024

#HurricaneHelene damaged the factory responsible for manufacturing over 60% of all IV fluids used in the US, leading to a major national shortage.

As clinicians what can we do to about the #IVFluidShortage and how can we prevent this crisis from happening again?

A thread 🧵
1/

There are many things we can do as clinicians to improve ICU care & reduce IVF use.

1️⃣Don't order Maintenance IV Fluid!
Almost no patient actually needs continuous IV fluids.
Most either need resuscitation (e.g. boluses) or can take fluid other ways (PO, feeding tube, TPN).
2/

Frequently if someone is NPO overnight for a procedure, MIVF are ordered.
This is wrong for two reasons.
We are all NPO while asleep & don't need salt water infusions!
We should be letting people drink clears up to TWO HOURS before surgery, per ASA.

3/ pubs.asahq.org/anesthesiology…

Read 16 tweets

Nick Mark MD

@nickmmark

Oct 1, 2024

New favorite physiology paper: Central Venous Pressure in Space.

So much space & cardio physiology to unpack here including:
- effects of posture, 3g shuttle launch, & microgravity on CVP
- change in the relationship between filling pressure (CVP) & LV size
- Guyton curves!
1/

To measure CVP in space they needed two things:
📼 an instrument/recorder that could accurately measure pressure despite g-force, vibration, & changes in pressure. They built & tested one!
🧑‍🚀👩‍🚀👨‍🚀 an astronaut willing to fly into space with a central line! 3 volunteered!
2/

The night before launch they placed a 4Fr central line in the median cubital vein & advanced under fluoro.

🚀The astronauts wore the data recorder under their flight suit during launch.

🌍The collected data from launch up to 48 hrs in orbit.
3/

Read 16 tweets

Nick Mark MD

@nickmmark

Jul 16, 2024

https://twitter.com/matt4va/status/1813202802337779731

The media silence on this is deafening.

Did he have a head CT? What did it show?
Did he have stitches? Tetanus shot?

The NYT ran nonstop stories about Biden’s health after the debate but can’t be bothered to report on the health of someone who was literally shot in the head?

https://twitter.com/matt4va/status/1813202802337779731

To the people in the replies who say it’s impossible because of “HIPPA”
1. I assume you mean HIPAA
2. A normal presidential candidate would allow his doctors to release the info. This is exactly what happened when Reagan survived an assassination attempt.
washingtonpost.com/obituaries/202…

My advice to journalists is to lookup tangential gunshot wounds (TGSW).

Ask questions like:
- what imaging has he had?
- what cognitive assessments?
- has he seen a neurosurgeon or neurologist?
- he’s previously had symptoms like slurred speech, abnormal gait - are these worse?

Read 4 tweets

Nick Mark MD

@nickmmark

Jun 30, 2024

You've probably heard "don't give lactated ringers because it raises lactate"

This statement is ~98% false, but there's one crucial practice-changing fact that you need to know.

A 🧵 all about lactic acid and lactated ringers!
1/

First off, we should ackowledge the obvious: Lactated ringers does in fact contain lactate... 28 mEq/L in fact

BUT there's one little detail to remember:
Lactate ≠ Lactic acid

When we measure "lactate" we care about the ACID (H+) which lowers pH & causes organ dysfunction
2/

But the correlation between pH & lactate is really bad!

Look at this analysis of lactate vs pH in 171 ICU patients.

There is a *weak* correlation in people with arterial lactate > 5, but even w/ lactate =10, pH ranged from 7.5 to 7.05. Quite a spread!

3/ ncbi.nlm.nih.gov/pmc/articles/P…

Read 10 tweets

Nick Mark MD

@nickmmark

Jun 13, 2024

If you intubate you need to read the #PREOXI trial!
-n=1301 people requiring intubation in ED/ ICU were randomized to preoxygenation with oxygen mask vs non-invasive ventilation (NIV)
-NIV HALVED the risk of hypoxemia: 9 vs 18%
-NIV reduced mortality: 0.2% vs 1.1%

#CCR24
🧵
1/

Hypoxemia (SpO2 <85%) occurs in 10-20% of ED & ICU intubations.

1-2% of intubations performed in ED/ICU result in cardiac arrest!

This is an exceptionally dangerous procedure and preoxygenation is essential to keep patients safe.

But what’s the *BEST* way to preoxygenate?
2/

Most people use a non-rebreather oxygen mask, but because of its loose fit it often delivers much less than 100% FiO2.

NIV (“BiPAP”) delivers a higher FiO2 because of its tight fit. It also delivers PEEP & achieves a higher mean airway pressure which is theoretically helpful!
3/

Read 15 tweets

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