By R. Irmak. Sam Houston State University. 2019.
Other monitors that are used may occasionally not provide reliable information for technical reasons generic 80 mg top avana free shipping erectile dysfunction doctor vancouver. Examples of this include neuromuscular blockade monitoring and automated blood pressure monitoring cheap top avana 80 mg on-line impotence clinics. Invasive monitoring such as arterial line and central venous line catheters may be technically difficult to insert, especially in the preterm. The overarching goal of15 2966 monitoring should be to establish American Society of Anesthesiologists standard monitors at the beginning of the case and add invasive monitoring, as appropriate. Although physical observation of the patient is important in preanesthetic evaluation, it is difficult to use this monitor effectively during a surgical procedure. Observation of the patient’s color, capillary refill, warmth of skin, muscle tone, fullness of fontanelle, and chest expansion are useful monitors, but they are difficult to reliably observe once the patient is covered with surgical drapes. There is a large dependence on electronic monitors during the majority of the procedure. However, it should be remembered that heart and breath sounds heard through a precordial or esophageal stethoscope, the compliance determined during hand ventilation, the appearance of bleeding in the surgical field, and trends noted in the anesthetic record are all important observations that the anesthesiologist can use as part of the overall assessment of the patient. It may be necessary to place the probe across the web space between the thumb and the first finger, around the lateral aspect of the hand, or on the foot. Many anesthesiologists will place and check two pulse oximeter probes at the beginning of the case because of the clinical experience of having one probe malfunctioning secondary to changes in perfusion during the case. Because there may be differences in preductal and postductal saturations, probes on the left hand or either leg may give lower values than a probe on the right hand in the setting of high pulmonary pressures or low systemic pressures. Especially in the first 2 weeks of life, there is a preponderance of fetal hemoglobin. The pulse oximeter does not compensate for the left shift of the hemoglobin desaturation curve, and pulse oximeter values read about 2% higher than arterial blood saturations. Precordial stethoscopes have the advantage of being simple and effective in allowing continuous monitoring of heart rate, heart rhythm, strength of heart sounds, and breath sounds. The esophageal stethoscope is more secure and less susceptible to external noise compared to the precordial stethoscope, while also providing the ability to measure core temperature. However, there has been recent skepticism about the usefulness of the stethoscope,100 and a survey of pediatric anesthesiologists in the United Kingdom and Ireland revealed relatively little use of the precordial or esophageal stethoscope. These leads, once applied, can bind tightly to skin, and care must be taken when removing them to avoid removal of skin, especially in the preterm newborn. Noninvasive automated machines are commonly used, but it is important that a proper-sized cuff—one-half to two-thirds of the length of the upper arm—be used, and that the arterial indicator, adjacent to the exit of the hoses, be placed over the artery. The cuff should not be routinely cycled excessively, more than every 3 minutes, because of the danger of venous stasis, especially in preterm neonates. In some cases, it is not possible to get reliable readings from an automated machine. An effective alternative is to use a manual cuff and place a Doppler probe over the brachial or radial artery. This system gives reliable systolic blood pressures over a very wide range; the Doppler probe can detect flow, even at very low blood pressures when the automated cuff may fail. Direct arterial blood pressure monitoring offers the double advantage of accurate blood pressure readings and the ability to withdraw blood samples. A 22-gauge catheter is often used in full-term neonates and a 24-gauge catheter in preterm neonates. A variety of sites can be used, including the radial, dorsalis pedis, and posterior tibial arteries. Ultrasound guidance is a valuable tool in the placement of arterial access, even in neonates. It is imperative that ultrasound guidance be attempted before resorting to a cutdown for vascular access. Some patients may come to the operating room with an umbilical arterial line in place. Although these can be used for monitoring, umbilical lines have both infectious and embolic risks, and may be in the way of the surgical field. All arterial lines should be flushed, either continuously or intermittently, with small amounts of heparinized saline, but caution should be used because even small amounts of flush can transmit significant pressure retrograde and cause embolic damage to the brain. Access to blood samples and central venous pressures can be especially useful in procedures, such as gastroschisis repair, in which there are anticipated large changes in both blood loss and third-space losses. Central catheters can also be used for the administration of blood, total parenteral nutrition, and cardioactive drug infusion. Insertion of these lines can be in a variety of sites, including the subclavian, internal jugular, femoral, or external jugular veins using special precautions to maintain sterile technique. The umbilical vein is 2968 not recommended as a site for central monitoring because of the risk of portal vein thrombosis. Central lines can be both challenging to insert, but also associated with significant complications related to infection, thrombosis, and emboli. Meticulous technique with insertion and maintenance of the line will help minimize these complications. Airway pressure measurements are particularly useful in assessing changes in resistance or compliance. Although it has been traditional that hand ventilation was important in determining changes in airway and chest compliance, there is controversy about the reliability of the “feel of the hand on the bag. Circuits such as the Jackson-Rees adaptation of the Ayre’s T-piece and the Bain circuit have been the most commonly used.
For patients stratifed to destina- the frequency of dressing changes and reviewing tion therapy purchase top avana 80mg free shipping erectile dysfunction treatment caverject, the treatment options can be limited dressing change protocols to ensure compliance and may require lifelong continuous suppressive and close monitoring order top avana 80mg fast delivery erectile dysfunction medication nhs. Imaging revision may be required to remove necrotic tis- typically demonstrates the presence of fuid sur- sue and allow for faster wound healing. Afer exhibit signs and symptoms of ongoing infection, surgical debridement, negative-pressure wound a device pocket revision may be necessary. Te pump pocket applied in select driveline infection cases as an and the surrounding tissue should be lavaged 535 49 Infectious Complications several times with saline. J Heart Lung Transplant 34(12):1495–1504 negative bacteria or yeast can also require more 2. Patients should undergo sterile daily dress- Furukawa S, Samuel R (2007) Infections associated with ventricular assist devices: epidemiology and ing changes and monitoring for signs of continued efect on prognosis after transplantation. Severe cases of pump-pocket or medi- Infect Dis 9:114–120 astinal infections with tissue defects may beneft 4. If all of these fail, another Nonvalvular cardiovascular device-related infections. Clin Infect Dis 41:1373–1406 nula infection will ultimately require lifelong oral 13. J Heart Lung Transplant diabetic control in advanced heart failure patients 22:914–921 treated with left ventricular assist devices. Ann Thorac Surg and left ventricular assist device driveline exit site 98(3):1088–1089 infection. Fleissner F, Avsar M, Malehsa D, Strueber M, Haverich and management of prosthetic joint infections. Klug D, Lacroix D, Savoye C et al (1997) Systemic infec- Infectious complications in patients with left ventricu- tion related to endocarditis on pacemaker leads: lar assist device: etiology and outcomes in the contin- clinical presentation and management. Ann endocarditis in adults: report of the working party of Thorac Surg 71(3 Suppl):S86–S91 the British society for antimicrobial chemotherapy. J Artif Organs antibiotic prophylaxis in cardiac surgery, part I: dura- 15(1):44–48 tion. Baradarian S, Stahovich M, Krause S, Adamson R, assist devices in advanced heart failure. Hieda M, Sata M, Seguchi O, Yanase M, Murata Y, Sato T, pump support: successful management using vacuum- Sunami H, Nakajima S, Watanabe T, Hori Y et al (2014) assisted therapy. J Heart Lung Transplant 26(9):956–959 Importance of early appropriate intervention includ- 60. Kawata M, Nishimura T, Hoshino Y, Kinoshita O, Hisagi ing antibiotics and wound care for device-related M, Ando M, Morota T, Motomura N, Kyo S, Ono M infection in patients with left ventricular assist device. Baronetto A, Centofanti P, Attisani M et al (2014) A sim- assist device exchange for persistent infection: a case ple device to secure ventricular assist device driveline series and review of the literature. Leclercq R (2009) Epidemiological and resistance issues of muscle faps to treat left ventricular assist device in multidrug-resistant staphylococci and enterococci. Plast Reconstr Surg 118(4):919–926 539 50 Acquired von Willebrand Syndrome Anna L. Te subunit contains among others interactions irrespective of the level of anticoagu- binding sites for platelet glycoprotein receptors lation only. Tis causes a Te larger multimers disappear signifcantly cleavage of high-molecular-weight multimers of from the circulation by 2 h ,. Hereby, the However, in supraphysiologic shear stress, an primary hemostasis is disturbed . Ventricular Assist Device) with device-specifc fea- A recent study also reported an up to 83±8% tures . Vincentelli A, Susen S, Le Tourneau T, Six I, Fabre O, explantation, most commonly at a time of heart Juthier F, Bauters A, Decoene C, Goudemand J, Prat A transplant. Van Belle E, Rauch A, Vincentelli A, Jeanpierre E, 34(2):289–294 Legendre P, Juthier F, Hurt C, Banf C, Rousse N, Godier 2. Crow S, Chen D, Milano C, Thomas W, Joyce L, A et al (2015) Von Willebrand factor as a biological sen- Piacentino V 3rd, Sharma R, Wu J, Arepally G, Bowles D sor of blood fow to monitor percutaneous aortic valve et al (2010) Acquired von Willebrand syndrome in con- interventions. Annu Rev Biochem 67:395–424 efect of shear stress on the size, structure, and func- 5. Tiede A, Priesack J, Werwitzke S, Bohlmann K, Oortwijn a risk factor and sometimes a disease. Hematology Am B, Lenting P, Eisert R, Ganser A, Budde U (2008) Soc Hematol Educ Program 106–112. Netuka I, Kvasnička T, Kvasnička J, Hrachovinová I, Ivák operative desmopressin infusion. Ann Thorac Surg P, Mareček F, Bílková J, Malíková I, Jančová M, Maly J 91(5):1420–1426 et al (2016) Evaluation of von Willebrand factor with a 32. J Heart Lung Transplant 35(7):860–867 during supraphysiological shear stress: therapeutic 28. J Am Coll Cardiol 56(15): von Willebrand factor degradation mediated by cir- 1207–1213 culatory assist devices. Stroke 43(2):599–606 545 51 Concomitant Noncardiac Surgery During Mechanical Circulatory Support: Management of Therapy Rachel A. As this unique patient population expe- ken down into early and late surgical issues. Terefore, understanding the time from mechanical circulatory devices and care methods implantation and the likely problems to be encoun- advance. Te general surgeon must pos- Care Team sess a cursory knowledge of the pathophysiol- ogy, surgical placement of mechanical devices, Coordinating care and choosing members of and their unique operative challenges in order perioperative team and overall management strat- to adapt and formulate a therapeutic plan that egy proves to be more challenging in this patient addresses the need for innovation both to address population over the more common general sur- intraoperative challenges and successfully accom- gical patients. Te potential for complications plish the general surgical goals and minimize the related not only to the general surgical procedure instances of complications.
The sphenoid However buy 80 mg top avana mastercard erectile dysfunction systems, because the intrasphenoidal anatomy is often bet- mucosa is frst removed only over the anterior wall of the ter visualized endoscopically cheap top avana 80mg otc impotence blood pressure, a more precise opening of the sella turcica. Most often the anatomy is seen well to remove the anterior wall of the sella turcica to the same enough to forgo an intraoperative x-ray. The assistant surgeon can use the 0-, 30-, or 45-degree long endoscopes for this portion of surgical procedure. In must take care not to injure mucosa when placing the blade these patients, frameless image guidance can be helpful. To obviate the risk of mucosal injury, the sur- geon may also use a knife with a retractable blade as de- signed by Paolo Cappabianca. The tumor is also resected Tumor Resection in the same sequential manner as in the microscopic tech- In the microscopic approach, the operative microscope nique, frst generating a plane between the dura and the should be adjusted prior to incising the dura such that the tumor. Subsequently, the tumor is removed inferiorly, later- objective distance is approximately 375 mm to allow for ally, and then superiorly. After tumor resection the 30- and adequate space for both the operative instruments and the 45-degree endoscopes can be used to better visualize the surgeon’s hands. In addition, the magnifcation should be set cavernous sinus wall and diaphragm sella. The dura ference in an endoscopic removal of a tumor is that the tu- is then typically opened with a surgical blade. This improves the A nerve hook is then used to generate a plane between the surgical efciency and provides a more certain removal of inner dural layer and the tumor/pituitary gland surface. The operative microscope can be adjusted to partially Closure visualize the medial wall of the cavernous sinus bilaterally. In the presence of a small hole in the be delivered into the surgical feld via either injection of diaphragm sellae, the sella is packed with an abdominal fat 10 mL of air or saline through a lumbar drain, by a Valsalva graft. The sella is then reconstructed with either the bony maneuver, or by jugular vein compression. How- autologous bone or cartilage is unavailable, a bioabsorbable 22 Microscopic versus Endoscopic Transsphenoidal Pituitary Surgery 233 plate must be used to reconstruct the anterior sellar wall. The primary ported the results of 219 female patients who underwent mi- diference is that after an endoscopic technique the defect is crosurgical resection of prolactinomas. Not only is the bony anterior sphenoidotomy larger patients treated between 1976 and 1979 and those treated in all directions, unlike the microscopic transseptal ap- between 1998 and 1992 to assess the role of surgery before proach, but also the nasal mucosa overlying the sphenoid (group 1) and during (group 2) the era of dopamine agonist is completely removed during the approach. Also because a speculum is not used, the adenomas and between 80 and 88% of patients with either fat graft can be more difcult to place during an endoscopic intrasellar or suprasellar macroadenomas displayed initial approach. The authors reported a 82% continued remission rate with a median follow-up I Microscopic Versus Endoscopic Surgical of 15. With regard to Cushing’s disease, Pouratian et al31 re- The microscopic transsphenoidal approach has been the most common technique for resecting pituitary lesions ported the outcomes in 111 patients with the diagnosis of over the past 40 years. Consequently, the majority of large Cushing’s disease without postoperative pathologic con- surgical series include patients with tumors primarily re- frmation. In addition, many of the older se- a drop in serum cortisol levels to 2 µg/mL or lower within ries do not diferentiate among those patients treated via 72 hours of surgery. The authors reported that 50% of the microscopic, endoscopic-assisted, or pure endoscopic patients achieved postoperative remission as compared approach. Over the past 10 years, larger case series have with 79% for the 490 total transsphenoidal operations been published reporting the surgical results using the pure for Cushing’s disease performed by this chapter’s senior endoscopic approach alone. Of the specimens, 161 contained tumor Microscopic Approach cell invasion and 192 displayed no evidence of invasion. In Laws and Jane21 reported their series of 4020 transsphe- addition, 291 specimens were from primary transsphenoidal noidal operations in which the majority of cases used the resection and 55 specimens were from repeat transsphenoi- microscope approach alone. The neuropathologist identifed dural invasion nonfunctioning adenomas and preoperative visual loss, 87% in 41% of the former group and in 69% in the latter group. Requirements for remis- dural invasion was noted in 50% of nonsecretory tumors sion included normalization of insulin-like growth factor-1 and in 30 to 35% of the secretory tumors. Acromegalic symptoms were improved undergoing primary tumor resection as compared with pa- in 95% of patents with a 10-year recurrence risk of only 2%. Finally, the authors pared with traditional craniotomy approaches, the results reported a 76. In comparing the microscopic versus the endoscopic approach, epistaxis decreased from 1. Over the past 10 years, reports detail- Endoscopic Approach ing the surgical outcomes following the endoscopic resec- tion of pituitary adenomas have emerged. These reports In assessing any surgical lesion, the surgeon must always have subsequently allowed for a comparison between the consider what surgical approach can best be utilized to max- microscopic and endoscopic techniques. As reported by Ciric et al,39 the surgeon’s experi- tients treated via a pure endoscopic approach. The operative microscope is a standard part of also compared complication rates to the rates reported by many neurosurgical operations from spinal to intracranial Ciric et al,39 generated via a national survey evaluating sur- procedures. Consequently, most neurosurgeons are familiar geons using a transseptal-transsphenoidal approach. For with how to manipulate the microscope to obtain an ideal nonsecretory adenomas, complete surgical resection was three-dimensional view. In addition, the microscope can confrmed via postoperative magnetic resonance imaging easily be positioned such that the manipulation of surgi- in 93% of cases using the pure endoscopic approach and in cal instruments is not impeded. An improved uses a nasal speculum, potentially allowing for decreased initial remission rate for secretory tumors was also seen injury to the nasal mucosa. The the microscopic transseptal versus the pure endoscopic ap- feld of view is narrow, restricting the view of anatomical proach, nasal septal perforations decreased from 6. Thus, this approach relies Frank et al40 also reported similar surgical outcomes in on such adjuncts as intraoperative fuoroscopy to assist with comparing the pure endoscopic approach versus the micro- the approach to the sella turcica.