First Aid/Shoulder Injuries


Dear Marcus,
I recently read an answer of your's concerning a stab wound to the shoulder, which mentioned a shoulder infection if not treated at a hospital. So, my question is, how long would it take to produce an infection? Also, what would happen to the shoulder if extreme pressure (like a lot of body weight) was applied to the wound?

Thank you!

Hello Zoie,

An infection of the wound could become visible in less than 24 hours (there's always that time period when you think it might be infected but hope it's not, but time will tell).  Pressure on the wound? I'm not sure what your asking? if someone was standing on the shoulder it would of course cause trauma to the muscles, tendons and joint capsule... especially if the weight was maintained for over 30 minutes. direct pressure, say 5-15 lbs is actually therapeutic to control and stop bleeding.

I hope that answered your question well enough. Good luck with your story.


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Marcus LaBarbera


I am available to answer most questions related to: first aid, pre- hospital medicine, EMT and Paramedic questions, medical transport, critical care transport, ICU/CCU care, sedation, and medicine in general.


I have worked as a NYS Paramedic since 1993 for both community based ambulance companies and large commercial agencies. I Have experience as bike team commander, and shift supervisor for a commercial ambulance. As a member of the Disaster team I was deployed to Louisiana for 20 days following hurricane Katrina. I worked along side the county Haz-Mat team as a "Tox-Medic" with advanced training in treating injuries from chemical agents. Besides my experience on the on the ambulance I have worked in a number of hospital based offices including dialysis and a sleep lab.

I started my EMS career as a NYS CFR (Certified First Responder)in 1989, an EMT in 1991, a Paramedic since 1993, and a CCU transport paramedic since 2005. I currently hold certification as a: NYS Paramedic, Critical Care Transport Paramedic, ACLS/CPR/PALS certified. Advanced Haz-Mat Life Support certified (AHLS). In the past I have taught CPR and ACLS to my coworkers and the local community.

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