Biomedical subjects

Jeremy C Johnson

Publications and source records attributed to Jeremy C Johnson.

4 recordsLinked to original sources

PubMed2006

Is PET useful in detecting occult nonpulmonary metastases in pediatric bone sarcomas?

UNLABELLED: Orthopaedic oncologists are increasingly utilizing positron emission tomography (PET) technology in the initial workup and staging of sarcomas and for monitoring treatment response. We evaluated the use of PET with fluorine-18-fluoro-2-deoxy D-glucose (FDG) to detect occult nonpulmonary metastases in patients < age 30 newly diagnosed with either Ewing's or osteosarcoma, and the impact of this information upon therapeutic decision making. We retrospectively reviewed prospectively collected data (1994-2004) on 55 patients age < 30 years old over a 10 year span. PET detected metastases in 12/55 (22%) of these patients, eight of whom (67%) harbored disease outside the lung; however, only 4/55 (7%) were upstaged to Stage IV specifically due to findings determined by PET alone. Three of 17 (18%) Ewing's sarcoma patients, but only one of 38 (3%) osteosarcoma patients, were upstaged by PET alone. The most important alteration in treatment decisions was the substitution of irradiation in lieu of surgery for local control in Ewing's sarcoma patients. LEVEL OF EVIDENCE: Diagnostic study, level II.

Adolescent↗

PubMed2006

Care of the chronic tracheostomy.

A minority of patients with neuromuscular disease require placement of a tracheostomy, usually for the purpose of providing mechanical ventilation. Often the tracheostomy is performed during a hospital admission for an acute illness. The debate about the appropriate timing of tracheostomy in critically ill patients has not been resolved; however, the weight of evidence now favors performing a tracheostomy early (within 7 d of translaryngeal intubation) if the period of mechanical ventilation is likely to be prolonged beyond 3 weeks. For patients with chronic progressive weakness who develop respiratory difficulty, the consensus of opinion is that tracheostomy should be performed in patients with severe bulbar involvement, inability to effectively cough up secretions despite mechanical aids for secretion clearance, or for those who are unable to tolerate or fail noninvasive ventilation. The decision to perform tracheostomy in patients with chronic neuromuscular weakness involves consideration of several factors, including complications, resources, quality of life, ethical issues, cosmetic issues, and cost. Complications from tracheostomy and physician-perceived poor quality of life often lead to a negative bias, such that some patients may be denied this life-saving procedure. Special training is needed to provide long-term tracheostomy care, and an organized approach should be followed to decannulate patients who recover from their acute illness. Appropriate and skilled care could significantly improve the longevity and quality of life of those patients with neuromuscular disease who have a tracheostomy for long-term ventilation.

Acute Disease↗

PubMedDate not supplied

Bone marrow sampling in pathologic fractures: intramedullary pediatric chest tube technique.

The objective of this article is to report upon a simple technique of bone marrow specimen collection of intramedullary bone tumors using a pediatric chest tube. This technique is described along with two case reports which include a 60-year-old female with metastatic breast cancer to the proximal femur, and a 63-year-old male with multiple myeloma of the proximal humerus. Utilizing this technique, in our experience, over 50 mL of aspirate can be obtained and definitive histologic material for cytogenetic diagnosis and immunohistochemistry. This technique is not indicated for biopsy of suspected primary lesions of bone due to the possibility of medullary or hematologic seeding and inappropriate invasion of soft tissue compartments.

Biopsy, Needle↗

PubMedDate not supplied

Obstructive sleep apnea: A practical review.

Obstructive Sleep Apnea (OSA) is a condition of repetitive stoppage of breathing during sleep. OSA has assumed major clinical importance as it is linked with the pathophysiology of many serious medical conditions such as congestive heart failure and stroke. We shall review the history, epidemiology, clinical presentation, evaluation, and management of sleep apnea.

Humans↗