Understanding the basic cardiac conduction system is key. Ho | Figure 1

Understanding the basic cardiac conduction system is key. Hopefully this “map” breaks it down for you.

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Hopefully this is clear enough. Just cool for me to see.](https://app.figure1.com/case-detail/44415c50-bd6f-45ba-bdb9-c6bd4d948459)

Dispatched to residence for fall. Upon arrival patient is found to be a 65yo/f sitting upright in the hallway. She states she was walking, lost her balance and fell. She denies LOC, negative for anticoagulants and is A/Ox4. Patient is able to stand with assistance and is walked to the cot and moved to back of the bus. Once in the bus she states she is experiencing chest tightness. Past med hx includes DM, ASHTMA, HTN and balance issues. Thoughts on the ekg?

\ (YOU MUST UNDERSTAND BASIC CARDIAC ANATOMY)\ As promised in an earlier post. Here is an intro to the basic waves, segments and intervals of the ekg.\ P wave- Represents atrial depolarization/ firing of the SA node. This node sits at the top of the right atrium. Also known as the pacemaker of the heart.\ PR interval- Reflects conduction through the atrioventricular node. The AV node holds this signal long enough to allow the atriums to deposit their blood into the ventricles. (This is where AV blocks happen)\ QRS complex- Represents ventricular depolarization (electrical impulse as it spreads through the left and right ventricles)\ T wave- Represents repolarization of the ventricles.\ Please feel free to drop a comments on any tips and tricks you used while learning the basics of ekg.

\ Thoughts on Ecg? 81yo/F presents to ed with chest pain.\ Hx\ DM\ CHF](https://app.figure1.com/case-detail/83ea012e-c982-4c17-a326-f36d64b8db4c)

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A 52-year-old man presented with a 20-minute history of chest pain radiating to the left shoulder and neck, associated with dyspnea and diaphoresis.
He had a history of hypertension, long-term smoking, and a sedentary lifestyle.
On physical examination, bibasilar crackles were noted on lung auscultation. An electrocardiogram (ECG) was performed in the primary care setting, and the patient was promptly referred to the emergency department.

A 28-year-old woman presented with a 3-day history of intense pruritus over the lower back. She reported no recent travel or exposure to new environments. She cares for a small kennel with approximately eight dogs rescued from the streets.
Physical examination revealed multiple small vesicles, some clustered and others scattered, predominantly involving the lumbar region and the left gluteal area.

A 4-month-old male infant presented with skin lesions localized to the chin for the past 3 days. Physical examination revealed multiple small pustules with surrounding inflammatory signs on the chin, along with a few scattered papules on the chest.

patient in late teens presenting after a collapse, no chest pain, no previous cardiac history, no history of sudden death in family, are there any features in this ekg that would warrant further work-up or is this just a pediatric ekg?