< Back Vent Mgmt #1: Basics The goal of ventilatory support is to maintain appropriate O2 and CO2 in the blood while offloading the work of the respiratory muscles and minimizing iatrogenic lung damage. Understanding this principle will help guide your ventilator management. Many variables can be manipulated on the ventilator, but there are a few key variables that truly control oxygenation and ventilation. While there is not one ideal setting for every scenario, there are a few basic principles that cover the majority of ventilator management. Basic Ventilator Settings First, it is important to understand what the ventilator does. The ventilator can push air into patients. You can control how much air is pushed in (tidal volume), the number of breaths per minute (respiratory rate, RR), and the concentration of oxygen molecules in the air itself (fraction of inspired oxygen, FiO2). It's also possible to control how quickly air is pushed in (flow)- but we will get to that later. It is important to note: the ventilator does NOT generate pressure- it only monitors pressure to prevent damage from elevated pressures (barotrauma). Breathing is controlled by three variables. Trigger- this determines when a breath starts. Either time, flow, or pressure. Time trigger is utilized when the patient is not generating any spontaneous breathing (ie mandatory breaths). Flow and pressure triggers are utilized if the patient has spontaneous respiratory activity. When the patient attempts to inhale, there is a change in flow and/ or pressure. This is sensed by the ventilator, and a breath is delivered. Limit- this sets the maximum value a parameter can reach during a breath. For example, volume-limited indicates that a breath can't exceed a certain max mL and pressure-limited indicates that the pressure monitored by the machine can't exceed a certain max cm H2O. For a graphic representation, please refer to the image in the section on Limit Variables in Deranged Physiology. Limits impact the shape of the waveform. Volume limited- flow ceases when the set/ target volume is delivered. Pressure limited- a large portion of the TV delivered at the beginning of the breath until the set/ target pressure is reached and then the flow tapers, slowly delivering the remainder of the volume until the breath is time or flow cycled (see next) Cycle- this determines the end of a breath. Time cycled- inspiration ceases at the end of a set time duration. Used in mandatory breaths. Flow cycled- inspiration ceases when flow drops below a certain level. Used in spontaneous breaths. Volume and pressure are not currently used to cycle breaths. The goals of mechanical ventilatory support are O2 delivery (oxygenation) and CO2 removal (ventilation). Effective oxygenation and ventilation are measured by an arterial blood gas- PaO2 indicates the partial pressure of O2 and PaCO2 indicates the partial pressure of CO2. Oxygenation is a function of the concentration of O2 delivered to the patient (fraction of inspired O2, FiO2) and the surface available for O2 exchange. Positive pressure maintains open airways, which maintains the surface available for O2 exchange. Mean airway pressure (MAP) is the parameter that indicates the average pressure measured in the lungs throughout inspiration (inspiratory pressure) and expiration (positive end expiratory pressure, PEEP). Expiration is usually 2-3 times longer than inspiration, so MAP is often simplified to PEEP when trying to optimize oxygenation. However, increasing inspiratory time can improve MAP without adjusting PEEP. Ventilation is controlled by minute ventilation (total volume of air exchanged every minute). Minute ventilation is respiratory rate multiplied by tidal volume. Therefore, respiratory rate (RR) and tidal volume (TV) are the two parameters that can optimize ventilation. Lung-Protective Ventilation Minimizing iatrogenic lung injury is also important when caring for patients receiving ventilatory support. Different types of trauma, including barotrauma (excess pressure), volutrauma (excess volume), and atelectrauma (repetitive opening and closing of alveoli), can damage lungs that are already diseased. The risk of barotrauma can be minimized by monitoring airway pressures (peak and plateau pressures). Volutrauma can be minimized by low tidal volume. Historically, larger tidal volumes were standard (10-12 mL/kg). Currently, the most commonly recommended volume is 6-8 mL/kg (there are some exceptions). Decreased TV leads to ↓minute ventilation and ↓CO2 clearance (↑PaCO2). This is the basic physiologic principle behind "permissive hypercapnia" during mechanical ventilation for ARDS. Atelectrauma can be minimized by maintaining PEEP, which keeps alveoli open. Additional References 1. Respiratory Therapy Pocket Reference Card Previous Next

< Back Hemorrhoids What are hemorrhoids? Patient information: Hemorrhoids [American College of Colon and Rectal Surgeons] Patient education: Hemorrhoids (Beyond the Basics) [UpToDate] Hemorrhoids are a normal part of anorectal anatomy. They are blood vessels in the end of the rectum and at the anal verge. External hemorrhoids overlie the external anal sphincter (at the anal verge) and the internal hemorrhoids overlie the internal anal sphincter (inside the rectum). The hemorrhoids fill with blood and help maintain continence (avoid leaking stool). See images below. Anything that increases pressure in the abdomen, including prolonged straining, coughing, pregnancy, and an enlarged prostate requiring straining to urinate, can lead to abnormally large venous plexuses, which are what most people know as hemorrhoids. Internal hemorrhoids are lined by the same tissue as the rest of the GI tract, which secretes mucus. External hemorrhoids are lined by the same tissue as the rest of the skin on our bodies. Source: UpToDate Images: Internal and External Hemorrhoids Symptoms When hemorrhoids become abnormally large as a result of prolonged straining, typically from constipation, they can cause pain and bleeding. Internal hemorrhoids- dull/ achy pain and bleeding with bowel movements. In addition, if internal hemorrhoids prolapse (move from inside the rectum out onto the perianal skin), which typically occurs with bowel movements, this can cause issues with perianal moisture, itching and skin irritation. This is caused by the mucus from the overlying tissue. Prolapsed hemorrhoids can sometimes reduce spontaneously (return to their normal location in the rectum) or might require manual reduction (might have to be pushed back in after having a bowel movement). If internal hemorrhoids External hemorrhoids- bleeding with bowel movements. Acute pain can occur when an external hemorrhoid becomes thrombosed (acutely filled with blood clot→ overlying skin gets stretched→ severe pain). What is conservative management for hemorrhoids? See “ Anorectal Disease: How do I prevent anorectal disease? ” Improving bowel habits is the first-line treatment for hemorrhoids. See patient handouts below. Sitz baths- fill a tube with water as warm as you can tolerate, and soak your bottom after every bowel movement and at least 3 times per day. For itching: moisture in the perianal skin can cause itching. Improving bowel habits and gentle perianal skin hygiene can improve this. Zinc oxide can be used as a topical barrier twice daily. For protruding or swollen internal hemorrhoids: hold the hemorrhoid tissue with a Tucks pads (witch hazel) to decrease the swelling, allowing the hemorrhoid tissue to be reduced. Patient Info- Hemorrhoids .pdf Download PDF • 58KB Patient Info- Fiber Guide .pdf Download PDF • 68KB What is the operative management of hemorrhoids? Acute thrombosis of external hemorrhoids- most patients will have resolution of symptoms with conservative management described above. However, if you present within the first 48-72 hours, the hemorrhoid can be excised. Incision and drainage alone is not recommended, given high rates of recurrence. If symptoms have been present for more than 72 hours, surgery is more likely to create more discomfort, and therefore it is typically avoided. Large external hemorrhoids or mixed internal and external hemorrhoids with prolapse- typically managed with hemorrhoidectomy or hemorrhoidopexy. Internal hemorrhoids- banding is the most common treatment. Other options include sclerotherapy and infrared coagulation. Previous Next

< Back More Information on Acute Care Surgery The Beginnings of Acute Care Surgery: A Paradigm Shift in Surgical Emergencies. Nelson BV and Talboy GE. Acute Care Surgery: Redefining the General Surgeon. Mo Med. Sep-Oct 2010;107(5):313-315. Acute Care Surgery from the perspective of acute care surgeons. Santry HP et al. A qualitative analysis of acute care surgery in the United States: It’s more than just “a competent surgeon with a sharp knife and a willing attitude.” Surgery. 2014 May;155(5):809–825. A detailed timeline of our history. The AAST History of Acute Care Surgery . Previous Next

< Back Gallbladder Disease Cholecystectomy (gallbladder removal) is one of the most common operative procedures performed. What does the gallbladder do? Your gallbladder stores bile and enzymes from the liver. When you eat, your gallbladder squeezes to drain bile into the intestines to help you digest food. What are the reasons for cholecystectomy? Symptomatic cholelithiasis. If gallstones are present, they can lead to increased pressure and pain when the gallbladder contracts. Typically occurs with a fatty meal. Pain can last minutes to hours. Acute cholecystitis. When the gallbladder drainage is blocked by gallstones, it can become acutely inflamed. Symptoms are similar to symptomatic cholelithiasis, but the symptoms don't resolve. Source: UpToDate Images: Anatomy of the Gallbladder What does surgery entail? What are the risks of the procedure? Your gallbladder is under your liver. Laparoscopic surgery is typically done with an incision at your belly button and 3 incisions under your ribs on the right upper abdomen. There is a risk of pain, bleeding, and infection with any surgical procedure. Specific to this procedure, there is a risk of damage to surrounding organs, including the liver and intestines. The worst-case scenario is damage to the tube that drains from the liver into the small intestine, called the common bile duct. This complication is infrequent, but if it occurs, you will need more procedures and a longer hospital stay. If we can't see things safely laparoscopically, we will proceed with an open incision under your ribs on the right. This is not common with elective surgery and is more likely in elderly diabetic patients with acute severe inflammation. *IOC- there is an additional procedure that we will perform that shows us the bile ducts and allows us to see if there are any stones in the bile duct that can cause obstruction. What can I expect post-operatively? You will have several small incisions from the laparoscopic port sites. They will have absorbable sutures, nothing that needs to be removed. You will have glue or gauze and paper tape on the incisions. The glue will peel off on its own in 10-14 days. If you have gauze, you can remove this in two days and shower like normal. You will have paper tape strips on the incision, and these will peel off on their own. You are at risk for a hernia through the small incisions, so avoid heavy lifting for 4 weeks after surgery. You may take acetaminophen (Tylenol) and ibuprofen (Motrin) as needed for pain. These can be taken at the same time. Take the narcotic pain medication if your pain is severe despite the acetaminophen and ibuprofen. After the few first days, you should work on decreasing the number of narcotics that you are taking. What can I eat after surgery? There are no specific dietary restrictions. However, if you eat a fatty meal, it may cause loose stool (diarrhea) until your body adjusts to not having your gallbladder, which previously stored the chemicals used to digest fatty food. This is seen in about 10% of patients and usually resolves. If it lasts more than a few weeks, there are medication options to treat this. What should I be worried about after surgery? If you have fever >101 F, severe nausea/ vomiting, inability to tolerate liquids, severe abdominal pain, increasing redness, or drainage from your incisions. UpToDate Patient Education Patient education: Gallstones (Beyond the Basics) Patient Information from Society of American Gastrointestinal and Endoscopic Surgeons (SAGES) Gallbladder Removal Surgery (Cholecystectomy) American College of Surgeons Operation Brochures Cholecystectomy: Surgical Removal of the Gallbladder Previous Next

Measuring Cups and Spoons < Back Kitchen Hacks #2 Measuring Cups and Spoons Cooking versus baking…what's the difference? Technically cooking is a general term encompassing all manners of food preparation. But cooking is typically used to indicate a style that doesn't involve baking. Baking is a science that requires attention to detail and precisely measured ingredients that often have to be combined in a specific order. Recipes for baked goods frequently indicate weight in ounces (which required a small countertop scale) as well as volume (measured in your dry measuring cup). On the other hand, cooking allows on-the-fly modifications- it's much more forgiving to small variations. Baking requires precise measurements- so you'll need a variety of dry and wet measuring utensils. If you're unfamiliar with baking, here is a quick summary of how to measure dry and wet ingredients. What are dry measuring cups and how do I use them? These hold the exact amount of an ingredient (you fill these to the top). Either spoon the ingredients into the cup or scoop the cup into the container holding the ingredient (ie wide-mouthed containers). Fill to the top without packing, and level off the top (knife, the handle of a cooking utensil, chopstick, whatever you have). The only ingredient that gets packed is brown sugar- otherwise, unless the recipe specifically mentions packing, don't pack! What are liquid measuring cups or beakers and how do I use them? These have graduated indicators to allow pouring an exact amount of liquid, and the top measurement is below the top of the cup (no spills when pouring). Why can't I just use dry measuring cups for liquids? If you use a dry measuring cup for liquid, it will be very challenging to avoid spilling the ingredient when adding it to the recipe (remember, dry cups get filled to the top). What can I measure with a measuring spoon? Fortunately, these can be used for both dry and wet (although if you have beakers with small measurements, you can also use those for measuring out liquids). Warning about dry ingredients. If a dry ingredient is specified by weight (ounces), this cannot be converted to cups! 8 ounces of flour ≠ 8 fluid ounces of liquid, which is 1 cup of liquid. If you want a visual of the range of what 1 cup of dry ingredients can weigh, check out this extensive list . Previous Next

< Back ICU Society of Critical Care Medicine (SCCM): Patient and Family Resources Meet the Critical Care Team Learn about the members of the ICU care team. Patient Communicator Application This free app by SCCM is designed to improve communication between patients, families, and caregivers. Critical Care FAQs Learn about which patients require care in the ICU, what things commonly happen in the ICU, as well as find a more detailed explanation of common medical conditions seen in the ICU. Resource Library The MyICUCare.org Resource Library includes complimentary materials aimed at educating patients and families about the critical care journal, both during an ICU stay and after discharge. Understanding Your ICU Stay: Information and Patients and Families booklet. American Thoracic Society- Patient Education | INFORMATION SERIES Managing the Intensive Care Unit (ICU) Experience: A Proactive Guide for Patients and Families Mechanical Ventilation What is Acute Respiratory Distress Syndrome? What is ECMO? Central Venous Catheter Arterial Catheterization What is Hemodialysis for Acute Kidney Failure? What is Sepsis? Palliative Care for People with Respiratory Disease or Critical Illness Tracheostomy in Adults Living with a Tracheostomy Venous Thromboembolism- Deep Vein Thrombosis (DVT) and Pulmonary Embolism (PE) Preventing Venous Thromboembolism [John Hopkins Medicine: Armstrong Institute for Patient Safety and Quality ] Previous Next

10 Loonshots How to Nurture the Crazy Ideas That Win Wars, Cure Diseases, and Transform Industries - S type and P type loonshots. Innovators (creating loonshots) have to co-exist with the “businessmen”- you can’t just segregate different groups. The innovators need the company to make a profit so they can continue to take risks and make discoveries. And the business needs to nurture loonshots. - In case you were wondering how polarizing crystals were discovered. Or check out this article in Science magazine. - Bad decisions may occasionally result in good outcomes. But you need to analyze wins- you might not be so lucky next time. - Good decisions may result in bad outcomes. You made the best decision with the information at your disposal. In those same circumstances, you’d make that same decision. - How do crickets synchronize their chirps? - Percolation. A mathematical explanation for predicting events based on an inherent variable. - How do forest fires spread? Relevant variables- the distance between trees, humidity, wind. - How do pandemics start? How appropriate…depends on the proximity of individuals. - Phase transitions - Why do traffic jams occur? Just above a certain density of cars on the roads→ jam. - Emergence- innate characteristics of how a group functions based on the size (ie what patterns shift after the group reaches a size, although the precise size is variable for groups) While individuals remain puzzles, man in the aggregate becomes a mathematical certainty. Meaning- group dynamics are universal, regardless of the characteristics of the group members. Previous Next

How to be a Terrible First Date Dating, Pt 1 How to be a Terrible First Date I've been dabbling in the world of online dating for years. Some dates have been more successful than others. But until this point, I've always had pleasant encounters. That all changed with my last couple of dates. I've been shocked to discover how different people can behave in public compared to the persona they project via text. I always imagined people would be more reckless in their text and more personable in real life. Oh, how wrong I was… My first date was a few months after I moved to town. We video chatted a handful of times before we met, and he seemed like a nice normal guy. The first clue should have been when he told me he had a lawsuit against him related to a business deal. I'm too trusting and gave him the benefit of the doubt. So…what went wrong? First, he spent the beginning of the date asking me leading judgmental questions. How many guys have I dated/ slept with, etc, etc. He proceeded to tell me I was promiscuous (really? I've dated like 7 people and I'm 35 years old). Next, he proceeded to discuss pornography and sexual preferences. Then he asked whether I thought people could know each other if they don't live together before getting married, and he told me I was wrong when I said yes. Next, he insinuated that he didn't believe that I'm a surgeon. Weird, but whatever. He went on to Google me in front of me. Like, legit. Probably spent about 10 minutes staring at his phone while I ate my dinner. A couple times I told him he should probably pay attention to the person who took time out of their day to come to meet him… Then he decided to tell me he didn't believe I was Hispanic because Hispanic women wear a lot of makeup. He found a picture from a few years ago when I was applying for a job and told me if I put in some effort, I could look better. I told him I'm so much more than my appearance, and I don't value myself based on looks. After a complete shitshow for the first half, I told him I'd give him a chance to start over and consider a different approach. I gave him the benefit of the doubt that he was just nervous. Unfortunately, he didn't adjust his approach in the second half. He then told me more details about his legal issues. Seriously, he spent a year in a work camp for white-collar criminals. He reminisced about the friends he made and the work he did. I had a hard time keeping a straight face. And the cherry on top of the terrible date? He lied about his height. He wasn't 5'6. I'm 5'3 and he didn't have an inch on me. Note- I'm not against short guys. I AM against guys who lie about their height. Don't be that guy. *Note- Grammarly assessed the tone of this post as "sad" and "disapproving". I'm impressed. Previous Next

< Back Common Conditions Trauma and ICU Patient education: Preventing infection in people with impaired spleen function (Beyond the Basics) For patients who have had their spleen removed (typically related to trauma) Patient education: Pulmonary embolism (Beyond the Basics) Also known as a blood clot in the lung or PE. Disclaimer from UpToDate (included at the end of every patient handout) [This generalized information is a limited summary of diagnosis, treatment, and/or medication information. It is not meant to be comprehensive and should be used as a tool to help the user understand and/or assess potential diagnostic and treatment options. It does NOT include all information about conditions, treatments, medications, side effects, or risks that may apply to a specific patient. It is not intended to be medical advice or a substitute for the medical advice, diagnosis, or treatment of a health care provider based on the health care provider's examination and assessment of a patient's specific and unique circumstances. Patients must speak with a health care provider for complete information about their health, medical questions, and treatment options, including any risks or benefits regarding use of medications. This information does not endorse any treatments or medications as safe, effective, or approved for treating a specific patient. UpToDate, Inc. and its affiliates disclaim any warranty or liability relating to this information or the use thereof. The use of this information is governed by the Terms of Use, available at https://www.wolterskluwer.com/en/know/clinical-effectiveness-terms ©2022 UpToDate, Inc. and its affiliates and/or licensors. All rights reserved.] Previous Next

< Back Ultrasound: Trauma E-FAST Purpose: identify acute traumatic pathology including presence of pericardial fluid, pneumothorax, and intra-abdominal fluid. Probe Can use curvilinear probe, but usually switch to the phased array for the cardiac view, so it might be easiest to just use a phased array for the whole study. The linear probe can also be used when evaluating for pneumothorax through the anterior chest wall. Abdominal Cavity Assess for fluid in 3 different regions of the peritoneal cavity. Can use curvilinear probe, but usually switch to the phased array for the cardiac view, so it might be easiest to just use a phased array for the whole study. Right upper quadrant- 1) between liver and kidney [Morrison's pouch], 2) tip of the liver in the right paracolic gutter, 3) lower right hemithorax Left upper quadrant- 1) between the spleen and kidney, 2) subdiaphragmatic space, 3) tip of the spleen in the left paracolic gutter, 4) lower left hemithorax Pelvic- males- between bladder and rectum, females- behind the uterus, anterior to the rectum (pouch of Douglas). Image in transverse and sagittal planes. Cardiac The phased-array or curvilinear probe can be used. The probe is placed inferior and to the right of xiphoid, pointed to left shoulder, with the probe in a horizontal plane (not directed to the bed). Identify presence of hemopericardium (4th trans-abdominal window of the FAST). Assess gross function (contractility). Assess volume status- full or collapsed left ventricle. Thoracic cavity- The “E” in E-FAST The linear probe is used to identify oresence of a pneumothorax. It is placed in the mid clavicular line, oriented cephalad-caudad, 3rd-4th intercostal space. Pneumothorax is present when there is lack of apposition of the pleural lining to the chest wall which leads to loss of lung sliding. Also no comet tail artifact or lung pulse, presence of a lung point (where the pleural surfaces meet, the junction between sliding and absence of sliding). The curvilinear or phased array probe can be used to identify hemothorax by visualizing fluid above the diaphragm in the upper quadrants abdominal views. References Society for Academic Emergency Medicine: FAST Exam Ultrasound Tutorial: FAST (Focused Assessment with Sonography for Trauma) scan | Radiology Nation Previous Next

2 Critical Care Lectures Vents .pdf Download PDF • 7.24MB Respiratory Failure .pdf Download PDF • 4.85MB Electrolyte Imbalance .pdf Download PDF • 3.88MB Acid Base Basics .pdf Download PDF • 1.14MB Kidney Injury .pdf Download PDF • 8.05MB Hemodynamics .pdf Download PDF • 9.86MB Heart POCUS .pdf Download PDF • 55.03MB Nutrition .pdf Download PDF • 3.52MB Ultrasound .pdf Download PDF • 84.19MB Blood .pdf Download PDF • 4.92MB Pain Delirium Agitation .pdf Download PDF • 16.05MB

Maintaining our humanity in the clinical environment Comfortably Numb < Back Maintaining our humanity in the clinical environment If you are working in an intensive care unit, your patients will frequently be intubated and/ or sedated. The ICU can be very dehumanizing, and it is easy to forget that patients are human beings with family and friends that love them. Adherence to critical care guidelines and following protocols is important. But while we are providing the highest level of care based on evidence, we must not ignore the humanity of our patients. There is a missing link that isn’t routinely taught in school or nurtured in training and isn’t encouraged when it is performed. The human connection, treating a patient like a person. Treat your patients as if they were your family member. Basic human decency supports the practice of avoiding derogatory conversations in the presence of patients. I have witnessed more than a handful of incidents of medical personnel discussing other patient scenarios in the presence of other patients. HIPAA laws aside, generic simple conversations are likely unavoidable (“hey the patient next door needs his pain medication…”, “is room 7 ready for radiology…”, etc). However, I have witnessed providers speaking about a brain dead patient who was being evaluated for organ donation in the presence of another patient. Speaking about death and organ donation in the room of a critically ill patient is unacceptable. Mentioning derogatory things about patients in the operating room is unacceptable. My personal opinion is that negative things should be avoided in general. I don’t mean that real problems should be swept under the rug. But in my opinion, extraneous negative remarks have no place in a patient's room. A few thoughts. 1. Don’t lose your humanity. Treat all patients as if they were your loved one (family, friend, whatever fits that category for you). If you catch yourself slipping into a routine of just seeing the procedures and diagnoses, I urge you to engage in intentional self-reflection. 2. Treat all patients as if they can hear and sense everything. I am not a proponent of the occult or the metaphysical, and I don’t believe in jinxes- I don’t believe that mentioning bad prognoses makes them more likely to occur. However, I believe that most patients who are intubated and sedated are aware, on some level, of their surroundings. There are plenty of reports of patients recalling stressful experiences from their time in the ICU. I don’t think we will ever know what they can hear or sense, or how it impacts their emotional and physical well-being. Therefore, I strongly advocate for treating all patients as if they can hear and sense everything. 3. Try to imagine what you would want if you were in the patient's position. Imagine you can’t talk, you’re in pain, you have an itch you can’t scratch, your eyes are stuck shut from eye crust that you can’t wipe away, your mouth and throat feel like sandpaper, you don’t have your glasses or your hearing aids, you have no idea where you are or what day it is, etc etc. Now imagine you are slowly waking up as your sedation medicine wears off. You have people pinching you and yelling at you to open your eyes. Compare that to hearing a calm steady voice in your ear, speaking encouraging words, explaining that you are in an ICU, you have a breathing tube in place, you’re safe, your medical team is waking you up to see if you can breathe on your own and get the tube out. I’m not suggesting that this practice will eliminate agitation when a spontaneous awakening trial is performed. But just imagine the difference of being reoriented when you have no control instead of being shouted at and told to open your eyes. Imagine someone taking a wet washcloth to your eyes to remove the crust, allowing you to open your eyes for the first time in days. It’s not something you’ll learn in medical school. And it shouldn’t be revolutionary…but just imagine the difference in the patient's perspective and understanding of their situation. Previous Next