Official Step 1 HY Cardiology Concepts & Discussion Thread

[Mr. Mojo Risin]

Feel free to use this thread to discuss HY Cardio concepts. Good luck to everyone!

Links to the other HY subject threads:

Biochemistry: http://forums.studentdoctor.net/thr...y-biochem-concepts-discussion-thread.1115421/

Endocrinology: http://forums.studentdoctor.net/thr...crinology-concepts-discussion-thread.1115426/

Gastroenterology: http://forums.studentdoctor.net/thr...nterology-concepts-discussion-thread.1115427/

Hematology/Oncology: http://forums.studentdoctor.net/thr...-oncology-concepts-discussion-thread.1115428/

Immunology: http://forums.studentdoctor.net/thr...mmunology-concepts-discussion-thread.1115423/

Microbiology: http://forums.studentdoctor.net/thr...-microbio-concepts-discussion-thread.1115422/

MSK/Skin/Connective Tissue: http://forums.studentdoctor.net/thr...ve-tissue-concepts-discussion-thread.1115430/

Neurology: http://forums.studentdoctor.net/thr...neurology-concepts-discussion-thread.1115431/

Psychiatry: http://forums.studentdoctor.net/thr...sychiatry-concepts-discussion-thread.1115432/

Renal: http://forums.studentdoctor.net/threads/official-step-1-hy-renal-concepts-discussion-thread.1115433/

Reproductive: http://forums.studentdoctor.net/thr...roductive-concepts-discussion-thread.1115434/

Respiratory: http://forums.studentdoctor.net/thr...spiratory-concepts-discussion-thread.1115435/

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[Lafakads]

What is occurring during phase 4 of the cardiac action potential? Is it K+ leaking out maintaining the Resting Membrane Potential (RMP) or is the Na/K ATPase maintaining the RMP?

 

[pathologyDO]

Lets see... Phase 4 is maintained by the Na/K ATPase I would assume, but may also have a small K rectifier current or some strange thing in addition? Not sure

 

[dfib slim]

I believe it's both. K+ leak to keep the membrane potential around -85mV and Na+/K+ ATPase to maintain the gradient.