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Biomedical subjects

K V Iserson

Publications and source records attributed to K V Iserson.

At least 109 records · Page 6Linked to original sources

Abscess incision and drainage in the emergency department--Part I.

Superficial abscesses are commonly seen in the emergency department. In most cases, they can be adequately treated by the emergency physician without hospital admission. Treatment consists of surgical drainage with the addition of antibiotics in selected cases. Incision is generally performed using local anesthesia, with intraoperative and postoperative systemic analgesia. Care must be taken to make a surgically appropriate incision that allows adequate drainage without injuring important structures. Postoperative care includes warm soaks, drains or wicks, analgesia, and close follow-up. Antibiotics are usually unnecessary. Complications of incision and drainage include damage to adjacent structures, bacteremic complications, misdiagnosis of such entities as mycotic aneurysms, and spread of infection owing to inadequate drainage. The infectious agents responsible for abscess formation are numerous and depend largely on the anatomic location of the abscess. Staphylococcus aureus accounts for less than half of all cutaneous abscesses. Anaerobic bacteria are common etiologic agents in the perineum and account for the majority of all cutaneous abscesses. Abscesses at specific locations involve special consideration for diagnosis and treatment and may require specialty consultation.

Abscess↗

Efficacy of the posttraumatic cross table lateral view of the cervical spine.

This is a retrospective study of 128 patients with a discharge diagnosis of cervical spine fracture, dislocation, or subluxation. The study was undertaken to establish the accuracy of the posttraumatic cross table lateral view radiograph of the cervical spine (CTLV). The radiographs were read by the faculty emergency physician author. If his diagnosis differed from the patient's final radiologic diagnosis, the radiograph was reevaluated by the radiologist author. The accuracy in diagnosing posttraumatic cervical spine abnormalities on CTLV alone was 74.2% and 79.7% for the emergency physician and radiologist, respectively. Thirty percent of cases undiagnosed by the emergency physician were subsequently treated as unstable injuries. Thirty-five percent of C1, 14.8% of C2, and 42.4% of C6 abnormalities were missed on CTLV by both the emergency physician and the radiologist. The results indicate that the CTLV, alone, is unreliable and potentially dangerous as a screening exam in diagnosing posttraumatic abnormalities of the cervical spine.

Adolescent↗

Methemoglobinemia from dapsone therapy for a suspected brown spider bite.

Recent reports have suggested the use of dapsone for brown spider bites. This drug, for many years restricted to use in cases of leprosy and rare dermatologic disorders, has significant side effects that must be recognized. A case of methemoglobinemia is reported in one such patient treated with dapsone. The difficulty of making the diagnosis of brown spider bite is discussed.

Adult↗

Usefulness of abdominal flat plate radiographs in patients with suspected ureteral calculi.

A total of 120 plain abdominal radiographs (PARs) from intravenous pyelograms (IVPs) were presented without patient history in a random manner to a staff radiologist and staff emergency physician (EP). Scout films were used as the PAR to minimize calculus movement. Each reader examined each film for the presence of ureteral calculi. The readers localized all calculi and rated the likelihood of their presence. Fifty-one PARs from IVPs demonstrated ureteral calculus disease; 40 of these films demonstrated 41 radiopaque calculi, while 11 films demonstrated obstruction without radiopaque calculi. These readings were then matched to the known IVP results. Together the readers were correct on 50% of the predictions (radiologist, 51%; EP, 48%). The EP and the radiologist had similarly correct percentages on PARs from positive IVPs (33% and 36%, respectively) and on PARs from negative IVPs (60% and 64%). True-positive (33% and 25%), true-negative (76% and 71%), false-positive (27% and 35%), and false-negative (36% and 55%) rates were constructed for the radiologist and EP, respectively. Our study demonstrates that PARs are unreliable and do not appear to add useful information in the evaluation of suspected ureteral colic.

Diagnostic Errors↗

Epiglottitis presenting as acute pulmonary edema.

Presented is the case of a 2 1/2-year-old with acute pulmonary edema associated with epiglottitis prior to intubation. The patient complained only of odynophagia and had one brief episode of apnea and flaccid posturing. Chest radiograph demonstrated pulmonary edema. A soft tissue radiograph of the neck confirmed the diagnosis of epiglottitis. The patient was managed successfully with prompt intubation, PEEP, and antibiotics. Pulmonary edema associated with epiglottitis may be more common than previously recognized. It may occur prior to or after intubation. When pulmonary edema is clinically evident, PEEP should be administered early.

Child, Preschool↗

Hepatitis B prevalence in emergency physicians.

The seriousness of hepatitis B (HBV) as an occupational hazard to health care workers is well documented. The prevalence of serologic markers for this disease in the general US population is less than 5%, but in medical and dental workers it is significantly higher: 16% in general dentists, 28% in surgeons, 23% in anesthesia personnel, and 30% in emergency department nurses. This study, done under the auspices of the American College of Emergency Physicians (ACEP), focused on the prevalence of HBV markers in emergency physicians. Twenty-five percent of the 1983 ACEP Scientific Assembly attendees participated in the serosurvey. Physicians already vaccinated against hepatitis B were excluded. The majority of participants (58%) were community emergency physicians between 30 and 39 years of age who had six or more years in emergency medicine. A total of 94% of the physicians indicated no prior history of hepatitis, and of these 13.1% had serologic markers for HBV. Including the 10 physicians with both HBV markers and history of hepatitis, the overall prevalence for markers in this study was 15.5%. This prevalence was five times greater than the general population. Emergency physicians should be considered a high-risk group for HBV infection.

Adult↗

Difficult intubations: aids and alternatives.

Physicians who are likely to encounter emergency situations should know how to secure an airway with techniques other than the standard methods of oral and nasal intubation. The approach and the equipment used depend on the clinician's abilities and experience. Aids and alternative techniques include use of the fiberoptic laryngoscope, guided retrograde transcricoid intubation, esophageal devices, cricothyrotomy, tracheotomy and transtracheal jet ventilation.

Cricoid Cartilage↗

Comparison of flow rates for standard and large-bore blood tubing.

One of the clinically significant rate-limiting components in even the fastest of intravenous (IV) fluid systems is the tubing connecting the IV catheter to the IV solution container. We evaluated the effect large-bore tubing has on reducing this limitation on fluid flow, measuring gravity and pressurized flow in standard and large-bore tubing alone and when each was connected to an 8 French and 12-,14- and two types of 16-gauge catheters. When combined with an 8 French catheter, large-bore tubing produces a 126% increase in flow under gravity and a 90% increase under pressure. The improvement with the large tubing was less significant as the catheter size decreased. Studies in normovolemic adult volunteers achieved similar results. Large-bore blood tubing and large-bore catheters should be used in all situations where the need for rapid fluid replacement is contemplated.

Catheterization↗

The prevalence of hepatitis B serological markers in emergency physicians.

Hepatitis B (HBV) is a well-documented, increasing occupational hazard to those in the medical and dental professions. While the prevalence of markers of hepatitis B in the general population in the United States is approximately 3% to 5%, the prevalence in the health professions has been found to be higher. The prevalence of markers in 260 emergency physicians, consisting of teaching and nonteaching staff and emergency medicine residents, was the focus of this study. Two hundred fourteen participants had not received hepatitis B vaccine; 46 had received the vaccine. Hepatitis B surface antigen (HBsAg), surface antibody (anti-HBs) and core antibody (anti-HBc) were tested. The overall prevalence of markers in the nonvaccinated group was 11.7% (25/214). Forty-one of 46 participants (89%) who had received hepatitis B vaccine demonstrated anti-HBs, evidence of immunity to hepatitis B. Thirty-nine of them had anti-HBs alone, and two had anti-HBs and anti-HBc. Of the five vaccinees who failed to demonstrate anti-HBs, one demonstrated anti-HBc alone. There was no statistically significant difference between the three groups in prevalence or type of markers. The prevalence of hepatitis B serological markers in this survey of emergency physicians was two and a half to four times that of the general population. Because of the increased risk of exposure to hepatitis B virus, early immunization against this disease through the use of hepatitis B vaccine should be considered by physicians in the practice of emergency medicine.

Emergency Medicine↗

Alternative forms of emergency care: the Arizona experience.

Federal, state, and county governments, along with the medical community, are continually attempting to find ways to curtail rising health care costs. Prepaid capitated health care systems have been devised and implemented in an attempt to control these costs. The Arizona Health Care Cost Containment System (AHCCCS) is an experimental system being tried in Arizona in an attempt to stabilize expenses within the Medicaid system.

Arizona↗

Pulmonary and aortic punctures--complications of an attempt at internal jugular venipuncture.

A case of pulmonary and aortic punctures occurred during an attempted internal jugular venipuncture in a patient with a dilated aortic arch. Procedural errors contributing to the complications included an inexperienced operator, inappropriate medial and caudal angulation of the needle, and failure to use a "finder" needle or Seldinger technique. Use of proper procedural technique will reduce the risk of complications in performing this procedure.

Adult↗

Blind nasotracheal intubation: a model for instruction.

Described is a model for use in instruction and evaluation in the technique of blind nasotracheal intubation. The model is constructed of readily available equipment that can be used for its primary purpose when the model is not needed.

Emergency Medicine↗

Rapid fluid replacement: a new methodology.

The ability to replace fluids rapidly is frequently the limiting factor in the survivability of trauma patients. We describe a fluid infusion system that provides approximately a fourfold increase in flow rates over currently available percutaneous systems. It incorporates a 14 French (4.5-mm internal diameter) catheter introduced into a central vein by the Seldinger technique, and a manifold that allows fluid from five separate IV bags to flow into the patient through one line. In vitro tests demonstrated a gravity flow rate of more than 850 mL/min normal saline and a flow rate under pressure of more than 2.0 L/min. Packed red blood cells diluted to 42% hematocrit flowed at 1,725 mL/min under pressure. In vivo testing in dogs demonstrated a maximum gravity flow rate of approximately 650 mL/min, and a pressurized flow rate of more than 1,600 mL/min normal saline. No unusual sequelae of large-bore catheterization were detected.

Animals↗

The attack on TAC.

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Anesthesia, Local↗