Open MedusaGPT from Anki's top bar and ask about the card on screen. Before it answers, it reads from a curated medical library, so you get the mechanism and the specifics.
Furosemide is a high-ceiling diuretic because the TAL handles about 25% of filtered Na⁺, and the segments after it have too little spare capacity to catch it. A thiazide blocks the DCT, which handles only 5 to 10%, so its ceiling is far lower.
Each effect below traces back to that one blocked carrier:
Effect
Why it happens
Large diuresis
A quarter of the Na⁺ load escapes to segments that can't reabsorb most of it
Can't concentrate urine
Less NaCl reaches the medulla, so the gradient washes out
Ca²⁺ and Mg²⁺ loss
K⁺ stops recycling, so the lumen-positive voltage that drives them is lost
Hypokalemia
More Na⁺ and flow reach the collecting duct while aldosterone is high
Metabolic alkalosis
Aldosterone drives H⁺ secretion, and volume contraction concentrates HCO₃⁻
Renin ↑
The macula densa senses NaCl through NKCC2 too, so it reads low NaCl
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Term explanations
Stop Googling mid-review.
Hover any underlined term on your card for the explanation you'd otherwise go and search for, in the same popup you get in Anki. With the Tutor on, the popup also has Ask about this, which hands the term to the Tutor.
A summary first, then the high-yield points
Works with the AnKing deck
15 lookups a day free, unlimited from Basic
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Bronchopulmonary dysplasia in preterm infants comes from arrested alveolarization after prolonged ventilation and oxygen.
Alveolar stage: about 36 weeks' gestation into childhood.
12 + 4 + 37
<1mAgain
6mHard
10mGood
4dEasy
A card in Anki, with Medusa on2,900+ terms · works with AnKing
Card Search
Find the card you half remember.
Anki's search needs the exact words on the card. Search my cards understands descriptions, questions and misspellings, so you can look for a card the way you remember it.
Try:
Medusa: Search my cards
Smart search: 4 best matches, 5 related. Smart searches: unlimited on your plan.
CardDeck
Digoxin toxicity can cause blurry, yellow-tinted vision (xanthopsia).
Quick results appear as you type and never leave your computer. Press Enter for a smart search, which understands questions, descriptions and misspellings.
Top bar → Search Cards, or Ctrl+Shift+F. Smart searches never cost credits.
Card Match
The slides go up after lecture.
Your lecturer posts 38 pages on antiarrhythmics. Somewhere in the AnKing deck are the cards that match, most of them still suspended.
Give Medusa the PDF. It searches your cards on this computer, grades the best 400, and sorts the matches by the lecture's own topics, with page numbers.
Drag the PDF onto Anki, or use Medusa → Find cards for a document…
Press Find cards (up to 17 credits).
Press Unsuspend. The yellow rows are suspended cards.
PDF, PowerPoint, Word, text or Markdown. The file itself isn't uploaded. About 10 to 25 credits a document. Works on any deck, not only AnKing.
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Studied 435 cards in 72.50 minutes today (10.0s/card).
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Medusa → Find cards for a document…
Lessons
Nine scattered cards. One lesson that ties them together.
Select cards in Browse, right-click, Generate Medusa lesson. Every fact links back to the card it came from. Hover a fact to see its card, or a card to see its facts.
Your cards in Browse
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1
Staphylococcus aureus is a gram-positive, catalase-positive, coagulase-positive coccus that grows in clusters.
2
Protein A on S. aureus binds the Fc region of IgG, blocking opsonization and phagocytosis.
3
TSST-1 is a superantigen that causes toxic shock syndrome.
4
S. aureus food poisoning starts within hours because the enterotoxin is preformed.
5
MRSA resists methicillin through an altered penicillin-binding protein, PBP2a, encoded by mecA.
6
Vancomycin is a first-line drug for serious MRSA infections.
7
S. aureus is the most common cause of acute infective endocarditis, including tricuspid valve disease in people who inject drugs.
Click a row, or a card link in the lesson, to see the card.
The lesson
With Medusa
Medusa Lessons: Staphylococcus aureus×
Step 1 of 6
The big picture
S. aureus is a gram-positive coccus that grows in clusters. It is catalase-positive and coagulase-positive, which separates it from the other staph.
Your cards also say S. epidermidis is coagulase-positive. That one is checked at the end.
Step 2 of 6
How it causes disease
Protein A binds the Fc region of IgG, so antibodies can't opsonize the bacterium.
It is the most common cause of acute infective endocarditis, including tricuspid valve disease in people who inject drugs.
Beyond your cards
Panton-Valentine leukocidin is a pore-forming toxin linked to necrotizing pneumonia and skin abscesses in community-acquired MRSA. None of your cards cover it.
Step 3 of 6
Toxin syndromes
TSST-1 is a superantigen. It cross-links MHC II and the T-cell receptor and causes toxic shock syndrome.
Exfoliative toxin cleaves desmoglein 1 and causes scalded skin syndrome.
Food poisoning starts within hours because the enterotoxin is already made when the food is eaten.
Step 4 of 6
Resistance and treatment
MRSA carries mecA, which encodes PBP2a, a penicillin-binding protein that beta-lactams can't bind well.
Vancomycin is first-line for serious MRSA infections.
Step 5 of 6
Check yourself
A 24-year-old woman has fever, hypotension and a diffuse red macular rash three days after starting her period. Two weeks later the skin on her palms peels. How does the toxin responsible cause disease?
This is toxic shock syndrome from TSST-1, a superantigen. Cross-linking MHC II with the T-cell receptor activates many T cells at once and releases IL-1, IL-2, IFN-γ and TNF-α.
Step 6 of 6
Check your cards
Staphylococcus epidermidis is coagulase-positive.
May be wrong: S. epidermidis is coagulase-negative. S. aureus is the coagulase-positive staph.
Medusa
Medusa is writing your lesson.
This one is in the library: 13 library lessons are free with any account.
Why Medusa
A tutor that reads before it answers.
The library
34,000
reference passages. MedusaGPT reads the relevant ones before it answers, so you get the mechanism and the specifics.
Asked from the back of a card
“Why do loop diuretics waste calcium when thiazides save it?”
Furosemide blocks NKCC2 in the thick ascending limb. K⁺ stops recycling into the lumen, the lumen-positive voltage goes away, and the calcium it was pushing between the cells leaves in the urine. A thiazide blocks NCC in the distal tubule instead. With less Na⁺ inside the cell, the basolateral Na⁺/Ca²⁺ exchanger runs faster, so the cell pulls more Ca²⁺ in from the lumen.
MedusaGPT · Why? on a furosemide card
Card fixes
Every change is one Undo away.
Ask “Is this card right?” or “Save to my card”. You see the edit before anything changes. Apply is a single Edit > Undo step, and it can last through AnkiHub updates.
tutor questions a day on the free plan. Basic gives you 100, Standard 500, and Pro is unlimited. Tutor questions never cost credits.
Dashboard
See what you're losing, by topic.
Anki's Stats tells you how much you reviewed. The Dashboard shows where it isn't sticking.
Retention for each category, so the weak ones stand out.
Your most-missed cards, with one button to make a lesson from them.
Practice questions aimed at your weakest categories.
The terms in your most-missed cards, and the ones you look up most.
Without
86.4%One retention number for the whole deck
Medusa×
Sample dataPeriod: 30 days
Review retention
86.4%
Reviews
23,418
Cards a day
781
By category
Retention per category in the period.
Cardiology91%
Pharmacology84%
Microbiology79%
Endocrinology76%
Renal72%
Biochemistry66%
Genetics61%
Most-missed cards
Most Again presses in the period, with how many times each card came up.
1
MRSA resists methicillin through an altered penicillin-binding protein, PBP2a, encoded by mecA.
9×
2
Class III antiarrhythmics block K+ channels and prolong the action potential.
8×
3
NF1 is caused by a mutation in the NF1 gene on chromosome 17, which encodes neurofibromin.
7×
4
In DKA, total body potassium is depleted even when serum K+ is normal or high.
7×
5
Class IA and class III antiarrhythmics prolong the QT interval.
6×
Item 1 of 5CardiologyMark
A 72-year-old man with atrial fibrillation and heart failure has had nausea for three days. He says lights look yellow and have halos around them. His medicines include furosemide and digoxin. Serum potassium is 6.1 mEq/L. Which mechanism best explains his symptoms?
Tutor modemedusaprep.com
QBank
Questions on your weak spots.
A reviewed bank of USMLE-style questions on medusaprep.com, aimed at the categories your Dashboard says are slipping. Each one is explained and links to the exact AnKing cards behind it.
Answer it, then see why the other choices are wrong.
Jump from a missed question to the cards that teach it.
Studying for the MCAT? There is a separate bank, with full-length exams.
Premed
Studying for the MCAT?
A reviewed question bank, full-length exams, a free Anki deck and flashcards from your own notes, with your scores by section, category and skill. Practice costs the same credits as the USMLE bank.
Question bank
Passage sets and standalone questions in all four sections, in tutor mode or timed at the real exam's pace.
Full-length exams
230 questions in four timed sections, with breaks. Pause and pick the exam up again on another day.
A free MCAT deck
An Anki deck for the MCAT, free to download, with an MCAT term dictionary in the add-on beside it.
Flashcards from your notes
Turn the slides and lecture notes from your science courses into Anki flashcards.
Yes. The free plan includes 15 term lookups, 20 smart card searches and 5 tutor questions a day, with no time limit. Paid plans start at $4.99 a month.
Does it work with the AnKing deck?
Yes. Term explanations work on AnKing cards, and MedusaGPT can find the AnKing cards on any topic, tell you how many you already have, and open them in Browse.
Will MedusaGPT change my cards?
Only when you press Apply. You see the change first, Apply is one Edit > Undo step, and the change can last through AnkiHub updates.
What are credits?
Credits pay for lessons, card matching, practice questions and card generation. Smart card searches and tutor questions never cost credits.
Can I use MedusaGPT outside Anki?
Yes. It's on every QBank question, and the whiteboard carries a card's conversation to the web, where MedusaGPT draws flowcharts, comparisons, graphs and real pictures.
In Anki in under a minute.
Three steps, and the free plan starts right away.
1Open Get Add-onsIn Anki, go to Tools > Add-ons > Get Add-ons.
2Paste the codeAdd-on code1707665584
3Restart AnkiYour cards are underlined the next time you review.
