Argye Hillis, M.D.
- Director, Center of Excellence in Stroke Detection and Diagnosis
- Professor of Neurology

https://www.hopkinsmedicine.org/profiles/results/directory/profile/0008837/argye-hillis
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Diagnostic neural blockade is used in low again pain, headache, neuropathic pain, and complex regional ache syndrome. Examples embrace zygapophyseal (facet) joint injections and medial branch blocks,126 sacroiliac joint injections,127 set off level injections, spinal nerve blocks, occipital nerve blocks, and sympathetic blocks. However, an in depth evaluate of the experimental and medical literature concluded that none of those procedures has unequivocally proved scientific usefulness in controlled studies. Furthermore, the assumption that native anesthetics can selectively produce conduction block of just one fiber sort in a nerve is probably false. Transaortic strategy for neurolysis of the celiac plexus with typical dye distribution ventral to the aorta. Chapter sixty four: Anesthesia and Treatment of Chronic Pain 1911 malignancies, similar to hepatic or gastric cancer, can also benefit from this intervention. This approach relies on the belief that nociceptive stimulation is transmitted along major afferent fibers that travel with the sympathetic fibers of the splanchnic nerves arising from T5-T12 and with the parasympathetic efferent fibers that together type the celiac plexus. The ganglia are located in the retroperitoneal area adjacent to the L1 vertebral physique. A diagnostic local anesthetic block to predict analgesic and unwanted effects is advocated. Because alcohol is hypobaric and phenol is hyperbaric, the patient should be positioned accordingly during administration of intrathecal neurolysis. In many instances, pain relief is incomplete, but consumption and side effects of opioids decrease. The restricted period of pain reduction and the restricted possibility of repeat injections are causes that neurolysis is mostly used in sufferers with short life expectancies. Nonetheless, many practitioners advocate radiofrequency ablations or cryoneurolysis at aspect joints and sacroiliac joints, in addition to a quantity of other harmful procedures. For example, in chronic back or neck pain (the most typical patient complaints), injections into side or zygapophyseal joints or alongside the medial branch from the posterior ramus of the spinal nerve root are frequently performed, although with out convincing documented long-term outcomes.
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Anesthesia providers should due to this fact be conversant in moveable gasoline or battery-powered ventilators appropriate to be used in disaster situations. A big selection can be found, and the following factors are important to consider: (1) Familiarity. In catastrophe anesthesia, most ventilation is a half of balanced anesthesia to ensure a rapid restoration and throughput of cases. Pneumatic transportable ventilators that provide flow era, time biking, and preset volume supply have been tried and examined in area situations and have been widely utilized by the army in current battlefield operations. The anesthesia supplier could also be involved at all levels from the supply of essential youth help through intensive care unit care. Agents from completely different parts of the spectrum may have common effects on susceptible somatic techniques. Because detection of a launched agent may not be instant, response ought to be passed on presenting indicators and symptoms and should require the supply of life support. The first two decide the management of the patient, and the second two decide the administration of the incident. On the premise of preexisting army and intelligence information, these potential hazards could be refined down to provide a framework of genuine hazards and administration protocols that can be applied throughout the hazard spectrum. Early life help and specific remedy can break the hyperlink between mass injury and mass lack of life. Mass ventilation functionality within the hospital is important in the administration of respiratory failure from accidental and deliberate chemical and biologic causes. The attacks in London in July 2005 concerned the use of high-explosive devices in a confined space. Toxic effects occurred, and using a chemical device by the terrorists was considered by the emergency responders. Anesthesia suppliers from the helicopter emergency service have been among the many first to deal with the injured onsite. In some nations, anesthesia suppliers are part of the preliminary emergency medical response and are skilled in the necessities of personal safety and decontamination. Instead, key features of representatives of varied classes of hazard are discussed from the standpoint of anesthetic and intensive care apply.
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The generally used positions and positioning aids and helps are listed in Box 70-5 (see Chapter 41). General Considerations the extended length of many neurosurgical procedures ought to be taken into consideration in all positions. Given the excessive danger of thromboembolic complications in neurosurgical patients, precautions including help hose and sequential compression gadgets are warranted. Diuretic Combinations the mixture of a loop diuretic (usually furosemide) and an osmotic diuretic is typically used. Supine the supine place is used with the head neutral or rotated for frontal, temporal, or parietal entry. Extremes of head rotation can obstruct the jugular venous drainage, and a shoulder roll can attenuate this problem. The head is often in a impartial place for bifrontal craniotomies and transsphenoidal approaches to the pituitary. The head-up posture is finest completed by adjusting the operating desk to a chaise longue (lawn chair) place (flexion, pillows beneath the knees, slight reverse Trendelenburg). This orientation, along with promoting cerebral venous drainage, decreases back pressure. Semilateral the semilateral place, also called the Jannetta place, named after the neurosurgeon who popularized its use for microvascular decompression of the fifth cranial nerve, is used for retromastoid access. It is achieved by lateral tilting of the table 10 to 20 degrees combined with a beneficiant shoulder roll. Again, extreme head rotation, enough to trigger compression of the contralateral jugular vein by the chin, must be averted. Lateral the lateral position can be utilized for access to the posterior parietal and occipital lobes and the lateral posterior fossa together with tumors on the cerebellopontine angle and aneurysms of the vertebral and basilar arteries.
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The total operative mortality for the first 30 days after pneumonectomy ranges from 5% to 13% and correlates inversely with the surgical case quantity. After all vessels are stapled, stapling of the bronchus happens and the entire lung is taken from the chest. A take a look at for air leaks is mostly performed at this point and reconstruction of the bronchial stump is accomplished. The bronchial stump must be as quick as possible to forestall a pocket for the gathering of secretions. If suction is applied to an empty hemithorax or a chest drain is linked to a standard underwater-seal system, it might trigger a mediastinal shift with hemodynamic collapse. Some surgeons place a specifically designed postpneumonectomy chest drainage system with each high- and low-pressure underwater relief valves to stability the mediastinum. The affected person scheduled to bear a pneumonectomy is taken into account at excessive danger for perioperative morbidity and mortality. The placement of large-bore intravenous strains is important in case blood products have to be administered. An invasive arterial line is placed for measurement of beat-to-beat blood strain and to monitor arterial blood gases. A major lung resection, such as pneumonectomy, decreases ventilatory perform and has vital effects on right ventricular perform. Increased proper ventricular afterload is brought on by an increase in pulmonary artery strain and pulmonary vascular resistance. This is taken into account to be one of the main causes of proper ventricular dysfunction after a serious lung resection. Specific areas of concern in the management of the affected person present process pneumonectomy include: (1) fluid management, (2) intraoperative tidal quantity, and (3) acute lung damage publish surgery. A more modern study by Licker and colleagues has proven that the extreme administration of intravenous fluids in thoracic surgical sufferers (more than three L in the first 24 hours) is an unbiased threat associated to an acute lung damage.
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Yet, a few research recommend that the size of hospice use is correlated with cost savings. Pain medicine physicians (also see Chapters 64 and 98) could additionally be offering care as part of a hospice profit. Critical care anesthesiologists are sometimes known as on to aid in the determination of hospice eligibility and to assist households focus on care plans that will involve hospice (also see Chapters one hundred and one and 102). For example, some hospice organizations may cover palliative radiation remedies, whereas others may not. Patients who outlive their 6-month prognoses might have their benefits prolonged in 60-day increments after a faceto-face visit with a physician, recertifying that the patient continues to meet hospice criteria. For instance, the standards for a patient with chronic lung illness include disabling dyspnea at relaxation, poor response to bronchodilators, hypoxemia at rest, and repeated hospitalizations for emergency division visits. The decision to forgo remedy with curative intent is generally troublesome for families, and prognostication is equally troublesome for suppliers. In a retrospective survey of fogeys of deceased youngsters in 2000, parents famous that their youngsters suffered "a lot" or "a fantastic deal," principally from ache, fatigue, and dyspnea. More data on advance directives and decision-making surrogates could be found in Chapter 10. In the intervention section, no variations in doctor communication, ache, use of hospital sources, or other measured outcomes were documented21 (also see Chapter 102). Palliative surgery for patients with cancer is most often for bowel obstruction, with wound management also common. A similar examine by the identical creator in 2011 of 227 patients showed a morbidity of 20% and mortality of 4%, with 90% experiencing symptom resolution, a major enchancment from the same study in 2004. The disagreement between the dad and mom and the medical institution was substantial and has never been publically resolved. Asking about religion and spirituality may present a context for the health care group, since many patients and families make decisions primarily based on their religious and spiritual beliefs. A religious counselor or chaplain may help patients and families with issues of religious suffering,84 as well as determine and facilitate particular rituals related to illness or burial.
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Such pretreatment can outcome in a severalfold increased and extended requirement for systemic and epidural analgesics within the perioperative interval compared with opioid-na�ve patients. In addition, opioid necessities can be influenced by gender, genetic predisposition, age, sort of surgery, and preoperative pain ranges. Physicians and nurses might overestimate tolerance, dependancy, and sedation but underestimate dependence. A paramount concern is the upkeep of sufficient perioperative opioid dosing to forestall withdrawal61,192 (see Box 64-1). Major issues for the anesthesiologist are coagulation disturbances and the increased risk for hematoma formation associated with spinal and epidural anesthesia. Sedation produced by anticonvulsant drugs could have additive results with anesthetics, whereas drug-induced enzyme induction may alter responses to or contribute to the organ toxicity of anesthetics. Gabapentin has a favorable aspect effect profile, and its relative absence of drug interactions allows continuation and speedy titration in the perioperative period. Preoperative exclusion of poisonous serum levels of phenytoin is recommended, to reduce the chance of atrioventricular conduction block. States of disorientation, nystagmus, ataxia, and diplopia may be manifestations of excessive plasma concentrations. Carbamazepine may produce sedation, ataxia, nausea, and (rarely) bone marrow melancholy or hepatorenal dysfunction. Oral valproic acid is usually used for prophylaxis of migraine, and intravenous valproic acid may be used to control episodic complications. Antidepressants are frequently used for neuropathic ache and for related melancholy. Adverse results are numerous and embody sedation, anticholinergic effects, and cardiovascular adjustments. Postoperatively, the likelihood of delirium and confusion may be elevated as a outcome of additive anticholinergic results. Selective serotonin reuptake inhibitors and atypical antidepressants corresponding to mirtazapine or venlafaxine are much less more doubtless to interfere with anesthesia.
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This process could be carried out with a laparotomy incision or by utilizing laparoscopic methods. Often, cholecystectomy is performed concurrently to forestall future cholelithiasis. Construction of the newly created pouch permits it to drain by way of only a slender opening. This configuration will increase the mechanical resistance to gastric emptying for ingested solids, whereas emptying of liquids proceeds usually. Laparoscopic gastric banding has an exceptional safety document with an exceedingly low operative mortality, although reoperation rates for minor issues are nontrivial. Historically, early surgical procedures involved creation of an extended jejunoileal bypass. Patients achieved significant weight discount, but this was generally accompanied by an unacceptable incidence of great vitamin and protein malabsorption, osteoporosis, and hepatic failure. Fluid can be added to the band to make the passageway smaller or remove fluid from the band to make the passageway larger. The antrum is removed to keep away from peptic ulceration, and food consumption is simply affected to a restricted degree. The essential component of this operation is division of the small intestine about midlength, with the distal end of the alimentary limb anastomosed to a generous gastric remnant. The more proximal biliopancreatic limb is anastomosed to the alimentary limb approximately 50 cm from the ileocecal valve. Major effects of bariatric operations have been nicely summarized in three intensive meta-analyses,fifty seven,seventy eight,seventy nine in addition to in a significant literature review. Long-term upkeep of weight lack of this magnitude can additionally be maintained for more than a decade. Improvements in obesity-related and metabolic syndrome�related comorbidities have additionally been evaluated. Resolution of diabetes following surgery is inversely related to the preoperative length of the illness and occurs more in those patients whose diabetes is managed using oral hypoglycemic agents. Hypertension resolved in additional than 60% of patients, and it improved in more than 18% extra sufferers.
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It is housed in the stomach, separated from the center by the diaphragm and thought to be punished by the bitterness of bile. Unlike Plato, Aristotle, who is recognized as the founding father of genetics, careworn expertise, or empirical data, rather than abstract pondering. Aristotle postulated that each one capabilities of the mind have been housed within the heart, which he considered crucial organ of the body-the seat of the intelligence and the origin of motion and sensation. Other organs surrounding it, such as the brain and lungs, existed merely to cool the guts. He thought that animals "prepare dinner" meals of their digestive tracts and that blood transports nutrients to every organ from the heart. According to Aristotle, the lungs cool the heart and the cranium serves as a cooling equipment for liquefying a transmitter, a type of "pneuma. This idea is the basis from which the concept of "pneuma" (breath or spirit) originates. God created man (Adam) out of the mud of the earth and inspired the breath of life into his nostrils, and a man became a dwelling soul. All residing organisms take in oxygen by respiration, distribute the O2 to peripheral tissues via circulation, after which excrete metabolites via the circulation and thru respiration. Respiration is the useful expression of the brainstem, and cessation of brainstem features results in the cessation of respiration. Because the brainstem maintains its perform through its supply of O2 and nutrients, cessation of circulation in the end results in cessation of respiration. The capabilities of the mind, coronary heart, and lungs are mutually dependent and share the essential function of sustaining life. An organism dies when considered one of these life-sustaining organ methods ceases to function. The conventional idea of dying of an organism emphasized the cessation of respiration or circulation, without consideration of the role of the brain. When mechanical ventilation was not widely used, cessation of brain functions associated on to cessation of respiration and evaluation of brainstem functions was unnecessary. After any considered one of these systems ceases to operate, death is inevitable unless artificial measures could be taken.
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Daro, 46 years: Malignant pleural mesotheliomas are strongly associated with publicity to asbestos fibers. In Malhotra V, editor: Anesthesia for Renal Genitourinary Surgery, New York, 1996, McGraw-Hill, p 265. The quality of surgery may be improved by better visualization of the operative site because of optical magnification and the maneuverability of the laparoscope, which provides a hitherto unobtainable anatomic view. Current choices embody giving 50 mg oral prednisone 13 hours, 7 hours, and 1 hour earlier than the procedure or 200 mg intravenous hydrocortisone, with or without H2 blockers, 2 hours before the cardiac catheterization.
Ningal, 47 years: Infection is the most typical complication and biliary issues similar to bile leaks or stricture can be difficult to treat and may lead to prolonged hospital stays with the risk of additional surgical procedure. In a small study performed in sufferers undergoing valve surgery, administering protamine in two divided doses by titration resulted in a larger dose however lowered bleeding, presumably by treating heparin rebound. Thus, appropriately educated cardiologists, radiologists, and vascular surgeons can deliver endovascular treatment of aortic illness. This complication ought to be kept in mind before extubation of the trachea in these patients.
Bufford, 38 years: Cobb angles of larger than 65 degrees normally cause important decreases in lung volumes. Another problem is whether the procedure ought to be carried out using common anesthesia with the patient breathing spontaneously, albeit with help, as is sometimes desirable when an anterior mediastinal mass is present. Posttonsillectomy hemorrhage is a dreaded surgical emergency, particularly in children131-133 (see additionally Chapter 93). Historically, the most common causes of extreme bleeding in cardiac surgical patients have been associated to platelet activation, platelet consumption, and hyperfibrinolysis induced by the extracorporeal circuit, and these circumstances are particularly pronounced in older patients.
Rocko, 30 years: In addition, other crucial events such as extreme, acute bleeding leading to hemodynamic compromise and necessitating huge transfusion can happen at any level during the surgery. Cardiac resynchronization remedy improves coronary heart failure symptoms, quality of life, train capability, and electrocardiographic variables. Communicating cysts typically produce air-fluid levels, are vulnerable to recurrent an infection, and may entice air by a ball-valve mechanism, risking fast enlargement or rupture. Initial open intervention experience discovered that a fetal abdominal patch was necessary to accommodate the added belly viscera.
Tempeck, 35 years: With big aneurysms in the neighborhood of the carotid siphon, the inferior occlusion may be carried out on the degree of the interior carotid artery by way of a separate incision within the neck. Wang F, Shen X, Guo X, et al: Epidural analgesia in the latent part of labor and the risk of cesarean delivery: a five-year randomized managed trial, Anesthesiology 111:871-880, 2009. Surgery on the zygoma and the nasal, orbital, and ethmoid bones might be attainable with an oral endotracheal tube. Pelosi P, Ravagnan I, Giurati G, et al: Positive end-expiratory stress improves respiratory function in obese however not in normal topics throughout anesthesia and paralysis, Anesthesiology ninety one:1221-1231, 1999.
Samuel, 25 years: Kenjiro Mori for his contribution to this chapter in the prior edition of this work. Vena caval compression within the supine place causes a lower in both stroke volume and cardiac output of 10% to 20%. There have been many research assessing the dangers and benefits of glycemic management with intravenous insulin remedy in surgical sufferers. Air in the epidural house supplies an interface and may trigger dissipation of shock wave power and local tissue injury.
Kayor, 65 years: Intraoperative dialysis should be thought of early within the process for patients with oliguria with elevated potassium levels. Although pharmacologic remedy of heart failure has improved, end result usually remains poor. Autonomic dysfunction is current in a big proportion of cirrhotic patients. Challenges for the longer term embody an answer to the organ scarcity, strategies to decrease the likelihood of disease recurrence, and pharmacologic advances geared toward limiting the unwanted effects of immunosuppression.
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