< Back Ultrasound: Misc Abdomen Assess for intra-abdominal fluid to rule-out an intra-abdominal source of hypotension. Examine the gallbladder- gallstones, wall thickening (>3 mm) and pericholecystic fluid are consistent with cholecystitis Examine the kidneys and bladder- overt hydronephrosis concerning for mechanical obstruction. Distended bladder despite foley suggests obstructed foley. Vascular Presence of DVT- patent veins are fully collapsible with light ultrasound compression- pressure has to be lower than the pressure needed to collapse the artery. Vascular access for arterial and central line placement. Previous Next

8 < Back Continuing Med Ed (CME) National Organizations American Association for the Surgery of Trauma [Must log-in to access] Journal of Trauma and Acute Care Surgery articles Archived AAST Virtual Grand Rounds Certain Annual Meeting Master Surgeon Lectures and topic-specific presentations Region VII Sessions Critical Care Committee Journal Reviews American College of Surgeons Journal of the American College of Surgeons [Must log-in to access] Surgical Education and Self-Assessment Program (SESAP®) [$685 for 168 CME credits] Training Courses ATLS Traditional Student Course - 16 AMA PRA credits BEST, ATOM, ASSET ACLS, PALS Annual Medical Conferences Other Sources UpToDate Local conferences at your facility (Morbidity and Mortality, Grand Rounds, etc) Military training courses Previous Next

< Back Pack the Guts https://video.wixstatic.com/video/3b6ff6_f29c38a601b645459ef002f51792fc87/1080p/mp4/file.mp4 Previous Next

< Back Blast- Multiple Penetrating Injuries A 32-year-old male soldier sustained a severe blast injury with a chest wound and a supraclavicular wound, a tangential right shoulder wound, and right hand wounds. He arrives at the hospital for care. He was awake and alert, hemodynamically normal. A secondary survey revealed these wounds. Injury Pattern What are the possible injuries based on this wounding pattern? Intra-thoracic (cardiac, pulmonary), great vessels/ right subclavian vessels Next steps in evaluation? Extended FAST exam to evaluate for fluid in chest, abdomen, and pericardial space. CXR to identify for retained foreign body. Helpful to place radio-opaque markers on wounds to help establish trajectory. Plain film of chest/ upper abdomen What additional injuries are possible based on these wounds and imaging? Any organ in the path of the wounds can be injured- this includes intra-abdominal structures (small and large bowel, stomach, spleen, kidney), retroperitoneal structures (kidney) and the diaphragm. How do we determine which body cavity to explore first? Hemodynamic stability and wounding pattern can direct how to proceed. A hemodynamically unstable patient requires swift intervention concurrent with ongoing resuscitation, while a stable patient can be approached more deliberately. The clinical exam can suggest which body cavity is causing the instability. Peritonitis, abdominal distension, grossly positive FAST in the abdominal views suggest the abdomen as the site of injury. Signs of thoracic injury causing instability include decreased breath sounds, jugular vein distension, muffled heart sounds, fluid on pericardial view of the FAST fluid, and a large volume of bloody output in the chest tube. In addition, location of projectiles on plain film help determine trajectory, and any structures along the trajectory can be injured. This patient was managed in a deployed environment by an austere surgical team. We did not have access to CT imaging and we had limited capacity for continuous monitoring. Therefore, in order to rule-out cardiac and intra-abdominal injuries, we performed a midline laparotomy. We performed a pericardial window through the laparotomy. There was no fluid in the pericardium. We performed an abdominal exploration. There were no intra-abdominal injuries. Wounds in the Cardiac Box In the classic description, the “cardiac box” is bordered superiorly and inferiorly by the sternal notch and the xiphoid process, and laterally by the nipples. However, thoracic gunshot wounds outside these confines can just as readily result in a cardiac injury. The diagnosis of cardiac injuries starts with a physical exam and FAST. Physical exam findings can include hemodynamic instability, muffled heart sounds, and jugular venous distension (Beck's triad). FAST will reveal pericardial fluid. If the patient is awake, they may be panicked and have an impending sense of doom. Penetrating cardiac injuries require operative repair. FAST Examination Online Tutorial Society for Academic Emergency Medicine SAEM FAST Exam YouTube Video Previous Next

< Back Mentorship What is mentorship? Mentorship is a partnership between a more experienced and knowledgeable individual (mentor) and a less experienced individual (mentee) seeking to learn, develop skills, and advance their career in the healthcare profession. The mentor is typically someone who has achieved a level of success that the mentee aspires to reach. Through this relationship, the mentee, who could be a medical student, trainee (resident or fellow), or junior staff member, can benefit from the mentor's expertise and past experiences, gaining valuable insights into the healthcare profession. The mentor can serve as an advisor, consultant, or coach depending on the mentor's expertise and the mentee's needs. For example, a mentorship relationship can be designed to help the mentee improve clinical skills, navigate the job search process, or advance research endeavors. It's common to have different mentors for different purposes, as each mentor may have different strengths. Mentorship also provides networking opportunities, as the mentor can facilitate connections between the mentee and other professionals in the field. In summary, mentorship is a valuable tool for professional development in healthcare, offering guidance, support, and connections that can help mentees achieve their goals. Do I really need a mentor? Throughout medical school and residency, I didn't have any formal mentors, but I did actively seek the opinions, advice, and feedback of several surgeons I respected. As a young staff surgeon, I still didn't actively pursue mentorship, though I now recognize that it could have been highly beneficial. My first formal mentorship relationship was late in my training, when I was an Acute Care Surgery fellow and I was required to choose a staff member as a mentor. It's not uncommon for trainees to lack mentors, and one possible explanation resonates with me. "Many young people today who end up in residency…have been on a fast track. They’re essentially high-achieving, highly driven professional students who have been on a fairly regimented pathway…and they haven’t reached a point where there are multiple pathways they could take."(1) As someone who has been on a straight path since high school, progressing from high school to medical school to residency to being a junior faculty, I potentially missed out on a valuable asset. It's important to note that having a mentor is not a requirement, but developing a strong relationship with a mentor can positively influence one's success. It's highly recommended that individuals consider formal mentorship, but it's equally important to recognize that they have the ability to end relationships that are toxic or not a good fit. How do I find a mentor? Mentorship relationships can be an essential aspect of professional growth for medical trainees. These relationships can develop organically or be assigned by program directors in residency or fellowship programs. If you are assigned a mentor, it can be a great experience, but it is also possible that you may not mesh well if the assignment was not carefully considered. It's essential to recognize that if you find yourself in a mentor-mentee relationship that is not productive, amicable, or beneficial, it's okay to end the relationship and seek out another mentor. On the other hand, organic mentorship relationships can also be incredibly fruitful. As you work with various individuals in different settings, such as the operating room, during rounds, or while discussing consults, you will begin to form opinions and may find that you gravitate towards a particular person. If you respect and trust them and they demonstrate skills or expertise that you want to learn from, they might be a viable option as a mentor. The process of finding a mentor can be as simple as asking the person you would like to work with if they would be willing to mentor you. Remember, the worst they can do is say no, so it's worth taking the risk to ask. If they don't have the time to commit to being a mentor, they may be able to connect you with someone else who could be a good fit. It's important to recognize that mentorship relationships require effort from both the mentor and the mentee. While your mentor can offer guidance, support, and feedback, it's ultimately up to you to take ownership of your own professional development. Be clear about your goals, seek out feedback, and be receptive to constructive criticism. By putting in the work, you can make the most of your mentorship relationship and set yourself up for success in your career. Finding a mentor can be a great way to help you achieve your personal and professional goals, but it's important to have a plan in place to make the most of the relationship. Here are some steps you can take after finding a mentor to ensure that you get the most out of the relationship: 1. Set specific goals: Take some time to think about what you hope to gain from your mentorship. Are you looking to improve your skills in a particular area? Do you want help navigating a career transition? By setting specific goals, you can make sure that you and your mentor are on the same page and working towards the same objectives. 2. Establish communication: Once you've set your goals, it's important to establish how you will communicate with your mentor and how frequently you will meet. This can be done through formal meetings, phone calls, or casual chats over coffee. Make sure that both you and your mentor are comfortable with the frequency and type of communication. 3. Complete assignments or tasks: Your mentor may assign you tasks or provide you with guidance on specific projects. It's important to take these assignments seriously and complete them as directed. This could be anything from revising your CV to drafting a study protocol. By following through on these tasks, you can demonstrate your commitment to the mentorship and make progress towards your goals. 4. Reassess and refine: As you work with your mentor, it's important to regularly reassess your progress and refine your goals. This may involve checking off completed tasks, adding new objectives, or removing items that are no longer a priority. By keeping your goals current and relevant, you can make sure that you are making the most of the mentorship. Overall, finding a mentor can be an incredibly valuable experience. By taking the time to set goals, establish communication, complete assignments, and reassess your progress, you can make sure that you get the most out of the relationship and achieve your personal and professional objectives. 1. Darves B. Physician Mentorship: Why It’s Important, and How to Find and Sustain Relationships. NEJM Career Center. 2018 Feb. Previous Next

11 Made to Stick Why Some Ideas Survive and Others Die 6 Principles of Sticky Ideas - Simple - Unexpected- crash at the end of the car commercial. - Concrete - Credibility- the ability to test. Before you vote ask yourself if you are better off today than you were 4 years ago- Reagan. - Emotions - Stories Curse of knowledge- we find it hard to imagine not knowing what we have learned. Can’t imagine what it’s like not to understand a certain concept that we accept as fact Previous Next

Medical Literature Evidence-Based Medicine After you have established a firm foundation of the basics of your chosen specialty, you're ready to develop regular habits to stay up to date on the newest research. Evidence-based medicine is the basis of high-quality patient care, but it can seem overwhelming to try to keep up with the ever-growing body of research. There are countless journals, and it would be time-consuming to search them regularly. So how does one go about navigating the vast ocean of available data? Registering for email alerts is a simple way to get notified when there are new publications. With a quick skim through the article titles to see if anything is relevant, followed by a review of the abstract/ article itself, you can be on the cutting edge of the latest information in your field. Several require individual registration, but it's a very simple and quick process. Many journals require a subscription, often available through your medical school or hospital library. If you are military, you have access to AMEDD Virtual Library (abundant medical resource collection). Thankfully, three publishers (LWW Wolters Kluwer , Springer and Elsevier ) have centralized their journals, so you can quickly subscribe to several journals [these journals are designated by L, S or E]. Medicine and Critical Care Journal of the Ameri can Medical Association New England Journal of Medicine Intensive Care Medicine Critical Care Medicine (L) Current Opinions in Critical Care (L) Journal of Intensive Care (S) Critical Care (S) Journal of Critical Care (E) Critical Care Clinics (E) Surgery World Journal of Surgery World Journal of GI Surgery JAMA Surgery J Gastrointestinal Surg Advances in Surgery Annals of Surgery (L) Annals of Surgery Open (L) BMC Surgery (S) Surgery (E) American Journal of Surgery (E) Journal of the American College of Surgeons (E) Surgical Clinics of North America (E) Advances in Surgery (E) Trauma and Emergency Surgery European J Trauma and Emergency Surgery Trauma Surgery and Acute Care Open Journal of Trauma and Acute Care Surgery (L) World Journal of Emergency Surgery (S) World Neurosurgery (E) Other Specialities Journal of Neurotrauma World Journal of Cardiology JAMA Cardiology JAMA Neurology JAMA Network Open Anesthesia and Analgesia (L) Current Opinion in Anesthesiology (L) Current Opinion in Clinical Nutrition (L) Current Opinion in Infectious Diseases (L) Current Opinion in Neurology (L) Diseases of the Colon and Rectum (L) Journal of the American College of Cardiology (E)

Surgery trainee education. Trauma surgeon. Acute Care Surgery. Collaboration Interested in being a guest contributor? Any suggestions and contributions will be promptly reviewed and added to the appropriate page/ subpage. The contributor will be noted on the website- you can choose if you want your name or Twitter handle or whatever other identification you would like (or none at all if you would like to be anonymous). Content currently under development. Note- this list is NOT all-inclusive. Database of clinical vignettes in key topics of trauma, critical care and emergency general surgery. Focused on more complex scenarios (ie not run-of-the-mill appendicitis)! Please check out the vignettes I currently have to get an idea of what I’m trying to create- and reach out with any suggestions or cases. Literature reviews - deep dives, high-yield articles, etc Procedural or skill tutorials (pre-peritoneal packing, using the ultrasound in critical care, reading a chest x-ray). Each tutorial is followed by a list of primary sources, encouraging readers to pull information from multiple references. If there is any particular procedure or skill that you would like to create a tutorial for, or something that is currently on the website that you would like to enhance (for example, more advanced ultrasound techniques or ventilator settings), please feel free to reach out with suggestions! There is a wide array of other content that you can add to as well. Note templates Recommendations on networking opportunities Recommendations on social media accounts to follow Educational resources (textbooks, journal articles, training courses, web based open access medical education) Please send me an email (form at the bottom of the page) or contact me on Twitter @doc_on_the_run if you have any questions or want to submit something.

Surgery trainee education. Trauma surgeon. Acute Care Surgery. FAQs Why did you make this website? Over these years of learning about the practice of surgery, I've also learned a lot about myself. I am not an expert, and I did not follow a typical pathway- but I have some knowledge and resources to share. As I transition into my new Acute Care Surgeon role after 17 years in training, I'm pausing to share my experience, tips for success, and random nuggets of wisdom. This will be a work in progress, and I look forward to seeing how it evolves. My goal is to share my experience and knowledge in the hopes of helping those who desire to follow this path. But why do we need another medical education website? There are so many good resources already... There are endless ways to explain clinical concepts- pictures, text, analogies, clinical cases, podcast discussions of cases or principles, review articles, etc. There are also different learning styles. When I was trying to grasp advanced ventilator management, I read basic critical care textbooks, a book dedicated solely to ventilator management, and various websites and journal articles. This website is another way to interact with the information. Hopefully you will understand some of the concepts in a new way that helps you remember and apply them in clinical scenarios. In addition, I have also tried to create a comprehensive collection of all the useful resources I know, like apps and open access medical education resources (websites, clinical guidelines, etc) in one place for trainees to What does Doc on the Run mean? The summer before my last year of medical school was the start of my running career. My focus was enjoying the outdoors, not pace or distance. During my residency, I met someone who helped me refine my running. I started timing myself, training, and racing. Within a year or two, I pushed through personal barriers to become a "runner." My first half marathon was on Thanksgiving in my third year of surgical residency. I am at the end of my formal training, I am now an Acute Care Surgeon. As a surgeon, there are numerous factors that I can't control. It's fast-paced, demanding, and dynamic. I enjoy the organized chaos and high-stakes cases. Running is key to my work-life balance. Unlike in the operating room or the trauma bay, I have control over most aspects of my runs- pace, distance, route, and thoughts. It's not chaotic- it's basically the polar opposite of my work. During the day, my mind is going a million miles an hour. When I run, everything becomes clearer- I can solve problems, mull over ideas, or process dilemmas. And perhaps the most concrete impact is the runner's high that I enjoy after finishing. I have continued to run 10Ks, 10 milers, and the occasional 5K or 15K. I have learned more about the science of running (HR training zones, different paces for tempo/ interval/ long runs/ short runs) and I've learned how to adapt training schedules to fit my life. Unfortunately, I have suffered my share of injuries, including most recently nerve impingement in my foot. While I may have scaled back, running will always be part of my identity. Did you really build this website yourself? Yes, I did. No, I didn't do all the intricate coding by myself. But I did design, format, and create the content. So are you a computer/ technology guru? Whatever I know about technology, I learned from my brother and from spending many hours researching problems online. While my parents might consider me an expert, I literally just search online to solve most issues. When I get to the end of the internet and still haven't found the solution, my next step is Apple tech support (obviously only if the problem is with my iPhone or Mac). What did you learn while making this website? - Formatting the working space on a website - URL redirect - Domains and subdomains - Search engine optimization (SEO) - Establishing custom domains - Which text/ background colors are easiest to read - Anchors If you weren't an Acute Care Surgeon, what would you do? I'd be a chef. I love cooking! Is there anything that is overwhelmingly gross in your job? I have had almost every body fluid on me- stool, urine, blood, etc. So very little grosses me out. But I can't stand oral or nasal secretions (aka saliva, slobber, snot, etc.).

< Back Ultrasound: Cardiac Exam Purpose: identify possible causes of hemodynamic instability, respiratory distress, assessment of volume status. Probe The phased array can be used for the entire exam. The curvilinear can also be used for the subxiphoid and IVC views. Views There are 4 basic views, including the parasternal long axis, parasternal short axis, the apical four chamber and the subcostal view. Additionally, the inferior vena cava can be visualized. Cardiac ultrasound is more challenging to learn than most other ultrasound studies, because probe usage (position, angle, rotation, translation, etc) have drastic impact on visualization. It’s necessary to understand what is shown in each view, so take time reviewing these so you can have a better appreciation for what you are seeing when you perform a study on a real patient. One recommendation, if it is difficult to visualize the heart, moving the patient into the lateral decubitus with their left side down can significantly improve visualization as the heart is closer to the chest wall in this position. For video and pictorial explanations of the views, please refer to these sites. Basic Cardiac Views, #1 Basic Cardiac Views, #2 Findings Gross abnormalities- decreased ventricular function, arrhythmias Profound hypovolemia Small hyperdynamic left ventricle with end-systolic collapse Inferior vena cava- assess volume status, either static measurement of diameter or calculation of collapsibility (>50% correlates with volume responsiveness). Respiratory variation (collapsibility/distensibility index). Takotsubo cardiomyopathy Akinesia of the apical and mid-ventricular segment, hypercontractile basal segments. Apical sparing (dilated). Acute cor pulmonale Respiratory disorder→ pulmonary hypertension→ right heart failure. Dilated right heart. Cardiac tamponade Effusion with end-diastolic collapse of the right atrium, effusion in front of the aorta Pulmonary embolism Free-floating thrombus in the right ventricle or pulmonary artery; right ventricular dilation/ systolic dysfunction; septal bowing into the left ventricle; dilated IVC without inspiratory collapse. Most sensitive/ specific indirect sign- right ventricular apical sparing (McConnell's sign). References Guidelines for Performing a Comprehensive Transthoracic Echocardiographic Examination in Adults: Recommendations from the American Society of Echocardiography Previous Next

< Back Cardiac Physiology Cardiovascular Physiology Oxygen Delivery Adequate cardiovascular function is vital to maintaining perfusion to the organs and tissues in the body. Perfusion drives oxygen delivery (O2) and removal of byproducts of cell metabolism (CO2). The amount of oxygen that is delivered (DO2) is a function of cardiac output (CO; the volume of blood ejected from the heart every minute) and the arterial oxygen content (amount of oxygen in the blood). Cardiac output is determined by the volume of blood the heart pumps out into the body with each heartbeat (stroke volume, SV) and the frequency of the heartbeat (heart rate, HR). Stroke volume depends on preload (blood volume returned to the heart), contractility (effectiveness of cardiac muscle activity), and afterload (pressure in the peripheral vasculature that the heart has to overcome to eject blood). Arterial oxygen content (CaO2) is the amount of O2 in the blood that is ejected from the heart. This is determined by dissolved O2 + O2 bound to hemoglobin. Hemoglobin carries O2, and the percentage of Hgb molecules that are saturated (bound) with O2 is determined by arterial blood gas (SaO2, arterial oxygen concentration) or pulse oximetry (SpO2, peripheral arterial oxygen concentration). Pulse oximetry is non-invasive and is a reliable surrogate (as long as SaO2 >90%). The O2 carrying capacity of one gram of hemoglobin is 1.38 (this is a constant in the equation). So this is the first part of the equation: the number of hemoglobin molecules x the % of those molecules that are saturated with O2 x how much O2 saturated hemoglobin can carry . The second part of the equation is the dissolved oxygen (partial pressure of arterial oxygen, PaO2, reported as mmHg). This value is multiplied by the constant 0.003, which is the mL of O2 dissolved per mmHg plasma. This number is infinitesimally small relative to the other half of the equation and it is typically ignored when determining oxygen concentration. This means that the significant modifiable factor in CaO2 is Hgb. Oxygen has to have something to bind to (Hgb) because dissolved oxygen has minimal oxygen-carrying capacity. Oxygen delivery (DO2)= CO x CaO2 Cardiac Output (CO)= heart rate (HR) x SV Stroke volume (SV)= the volume of blood ejected from the heart each heartbeat. Arterial oxygen concentration (CaO2)= [1.38 x Hgb x SaO2] + [PaO2 x 0.003] How can oxygen delivery be increased? One of the components of the equation has to be adjusted. Increase cardiac output. Increase SV- use of an inotropic agent (* medication that increases the strength of the heart contraction), ensure adequate preload (volume resuscitation). Increase HR- use of a chronotropic agent (* medication that increases heart rate). Increase arterial oxygen content Increase blood hemoglobin concentration *See pharmacology below Oxygen Consumption Oxygen consumption (VO2) is determined by how much oxygen the peripheral tissues extract and use. It is the difference between oxygen delivery (DO2) and oxygen return(ed) (SvO2). Oxygen consumption (VO2)= DO2 - SvO2. Oxygen consumption is calculated by subtracting SvO2 or ScVO2 from the amount of oxygen delivered. Venous oxygen saturation (SvO2 or ScVO2)- concentration of oxygen in the blood returning to the heart. Measured with a central venous catheter. *See below under CV monitoring for more details. Cardiovascular Monitoring There are several techniques for monitoring cardiovascular parameters, ranging from non-invasive to maximally invasive. Non-invasive methods include telemetry, pulse oximetry, and blood pressure monitoring. The benefit of these devices is their simplicity of use and interpretation. But these are error-prone, and regarding blood pressure, it doesn't provide continuous monitoring. For more info, see lecture entitled " Hemodynamics ". Arterial lines can be placed to provide continuous cardiac monitoring. The arterial waveform can indicate specific pathology (see Edwards Quick Guide to Cardiovascular Care ). In addition, an arterial line can report stroke volume variation. Stroke volume variation (SVV) is a surrogate of arterial pressure changes with inspiration/ expiration. If the change in pressure with respiratory cycles is >10-15%, it suggests the patient is fluid responsive, meaning they are likely to improve their preload (and cardiac output and blood pressure) with IV fluid administration. Central venous catheters can be placed to deliver intravenous medication as well as provide cardiac monitoring. A central venous catheter can measure the pressure of the blood returned to the right atrium (central venous pressure, CVP), which is a crude measurement of preload and right heart function. In addition, the oxygenation of the blood returning to the right heart (from the head and upper body) is reported as Central venous oxygenation saturation (ScVO2). ScVO2 reflects the balance between oxygen delivery and consumption. Arterial lines and central venous catheters are considered "minimally invasive". A pulmonary artery (PA) catheter is the most invasive device for cardiac monitoring. Similar to a central venous catheter, a PA catheter can determine the oxygenation of the blood returning to the right heart, which is the mixed venous oxygen saturation (SvO2). However, in contrast to the central venous catheter which is located in the superior vena cava (proximal to the right atria), this device is measuring blood oxygenation in the pulmonary artery (from the right ventricle), so it accounts for the blood from the entire body (unlike the ScVO2). Cardiac Pharmacology Vasoactive medications are frequently used in the ICU for the management of shock, heart failure, and other acute pathology. There are several key receptors, and understanding the function of each receptor is the key to using these different agents correctly. Receptors * α (alpha) 1- vasoconstriction * α2- inhibit norepinephrine release from presynaptic neurons * β (beta) 1- chronotrope (↑HR), inotrope (↑Ca in cardiac myocytes ↑contractility), dromotrope (↑cardiac impulse conduction velocity) * β2- vasodilation * Dopa 1- vasodilation * Dopa 2- neurotransmitter release Pharmacologic Agent Classification Each medication has a specific physiologic effect based on its particular mechanism of action. Agents may stimulate or inhibit receptors (see above) or alter the concentration of a key substance (cAMP, calcium, potassium, nitric oxide (NO)). Previous Next

11 < Back Board Examinations American Board of Surgery: General Surgery Boards Exam Prep Master the General Surgery Oral Boards by Dr Hassan Aziz . Dr Aziz reviews key surgical topics, including trauma, thoracic, pediatric, HPB, GI, breast cancer, endocrine, vascular. [Reference courtesy of Hassan Aziz, MD @Sharpknife_Aziz ] Surgical Education and Self-Assessment Program (SESAP). Resource for general surgeons- stay current with the latest surgical knowledge and prepare for examinations. American Board of Surgery: Surgical Critical Care Boards Exam Prep Evidence-Based Practice of Critical Care. 3rd edition, 2019. Reviews the literature regarding specific high yield critical care topics. Trauma, Critical Care, and Surgical Emergencies: A Case and Evidence-Based Textbook. 1st edition, 2010. 64 cases that review the basic principles of ACS. Previous Next