PubMed Health⌕ Search

Biomedical subjects

P E Andersen

Publications and source records attributed to P E Andersen.

At least 55 records · Page 3Linked to original sources
PubMed1997

Endovascular management of hemorrhage in patients with head and neck cancer.

OBJECTIVE: To present selective endovascular embolization as a therapeutic alternative to surgical ligation in the management of hemorrhage in patients with head and neck squamous cell carcinoma. DESIGN: Retrospective chart review of patients with head and neck cancer and significant hemorrhage who were treated with selective endovascular embolization. SETTING: A university medical center. PATIENTS: A total of 12 patients, aged 26 to 72 years, with 13 episodes of hemorrhage were treated at Oregon Health Sciences University, Portland, between November 1991 and January 1996. INTERVENTION: All patients underwent angiography with selective endovascular embolization at the interventional radiology suite using a combination of endovascular balloons, platinum coils, and microparticles. OUTCOME MEASURES: All charts were reviewed for diagnosis, treatment, factors that may have contributed to hemorrhage, bleeding site, therapeutic measures, control of hemorrhage, postembolization course, complications, and number of hospital days. RESULTS: The cause of the bleeding was tumor in 5 patients, pharyngocutaneous fistula in 4 patients, radiation necrosis in 3 patients, and postoperative complication in 1 patient. Bleeding arose from the common carotid artery in 4 patients, external carotid artery and its branches in 8 patients, and internal jugular vein in 1 patient. Hemorrhage was successfully controlled in all patients; a permanent left-sided hemiplegia and facial weakness developed in 1 patient. There were no recurrences of hemorrhage. All patients were discharged from the hospital. CONCLUSION: Angiography with selective embolization is a safe and effective alternative to surgical ligation for control of hemorrhage in patients with squamous cell carcinoma of the head and neck.

Adult↗
PubMed1997

Midline mandibular osteotomy: an analysis of functional outcomes.

Although the oncologic validity and perioperative complications of midline mandibular osteotomy are well described, little attention has been directed toward the long-term functional problems that may be associated with its use. Thirty-one patients who had undergone this procedure were examined to assess postoperative sensation, temporomandibular joint (TMJ) function, occlusion, and cosmesis. The majority (27 of 31) patients had some sequelae but these were minor in nature. Twenty of 31 patients had abnormal sensation, 24 of 31 noted a changed occlusion, and 15 of 31 had signs or symptoms of TMJ myofascial pain. Although patients should be advised of the potential for functional problems with this procedure, they can be reassured that these are likely to be relatively minor in significance. If technically feasible and if an exact restoration of occlusion is a priority, a prefabricated lingual splint should be used.

Dental Occlusion↗
PubMed1996

Management of the orbit during anterior fossa craniofacial resection.

OBJECTIVE: To determine the postoperative ocular function in patients undergoing anterior fossa craniofacial resection with preservation of the orbit. DESIGN: Retrospective medical chart review of patients treated from January 1, 1973, to July 31, 1994. Median follow-up was 38 months (range, 1-210 months). SETTING: Tertiary referral center. PATIENTS: Fifty-eight consecutive patients undergoing anterior fossa craniofacial resection with orbital preservation for tumors involving the anterior skull base. MAIN OUTCOME MEASURES: Assessment of orbital complications of treatment, need for further surgical intervention to correct these complications, and determination whether functional vision was retained at last follow-up examination, and tumor recurrence within preserved orbits. INTERVENTIONS: Anterior craniofacial resection with orbital preservation. Postoperative radiation therapy was administered to selected patients. RESULTS: Overall, 25 patients (43%) had some ocular sequelae of their treatment. This consisted of epiphora in 21 patients, diplopia in 8, vision loss in 6, and pain and enophthalmos in 2. Twelve patients required revision surgery consisting of dacryocystorhinostomy in 8, ectropion repair in 3, drainage of orbital mucocele in 1, and corneal transplant in 1. Ocular complications were more common and vision loss occurred only in patients treated with postoperative radiation therapy. Functional vision in the ipsilateral eye was retained in 50 of the 58 patients. CONCLUSIONS: When the orbit is preserved during anterior fossa craniofacial resection, ocular sequelae are frequent and may require revision surgery. Functional vision can be preserved in most patients.

Adolescent↗
PubMed1996

The extent of neck disease after regional failure during observation of the N0 neck.

BACKGROUND: The optimum management of the N0 neck remains controversial. When the neck is observed it is hoped that close follow-up will detect regional failure at an early stage. To test this hypothesis we examined patients undergoing therapeutic neck dissection for newly developed neck metastases during observation after treatment of the primary tumor. METHODS: A retrospective chart review of 47 patients undergoing neck dissection for regional failure after surgical treatment of the primary tumor and observation of the neck from 1987 to 1992 was performed. The median time to failure in the neck was 13 months. RESULTS: The clinical neck stage at the time of neck dissection was N1 in 37, N2A in 6, N2B in 1, and N3 in 3. However, pathologic staging revealed stages of N1 in 19, N2A in 5, N2B in 20, and N3 in 3. Extracapsular spread (ECS) was present in 23 patients (49%). Overall 36 patients (77%) had adverse pathologic findings (N greater than 1 or ECS). CONCLUSIONS: These data indicate that when observation is used for the neck at risk for metastasis, patients tend to fail with high stage disease in the neck. This supports the philosophy of elective treatment of the neck but cannot show whether elective treatment will improve survival.

Aged↗
PubMed1996

Selective neck dissection and the management of the node-positive neck.

OBJECTIVE: To assess the oncologic effectiveness of the selective neck dissection (SND) in patients with both clinically and pathologically proven regional metastases. METHODS: A 4-year retrospective medical chart review was conducted in an academic tertiary care referral center. Twenty-nine patients with a newly diagnosed upper aerodigestive tract squamous cell carcinoma, and both clinically and histologically proven cervical metastases who underwent 36 SND, had their records reviewed. Minimum follow-up was 2 years. RESULTS: Regional metastasis were staged N1 in 13 patients, N2A in 1, N2B in 8, and N2C in 7. Seventeen supraomohyoid and 19 lateral neck dissections were performed. Extracapsular spread of tumor was present in 11 patients. Postoperative radiation therapy was administered to 20 patients. Actuarial disease-specific survival at 4 years was 47% overall, 67% in N1 patients, and 41% in N2 patients. Only 1 failure in the treated neck occurred for a 4-year actuarial regional failure rate of 4%. The actuarial local failure and distant metastasis rate were 36% each. CONCLUSIONS: In carefully selected patients with clinically and histologically apparent regional metastases, the selective neck dissection can be an oncologically effective procedure.

Adult↗
PubMed1996

Cephalic veins in coronary artery bypass surgery.

Various alternative conduits for aortocoronary bypass grafting have been suggested when the saphenous vein quality is inadequate. During a 10-year period we have used the cephalic vein in 39 patients. Eighteen entered an angiographic follow-up study. A total of 31 arm vein grafts were used with 43 distal anastomoses. When calculating patency by number of patent distal anastomoses, this was 46% (median follow-up was 31 months), but calculating by the number of patent grafts we found 52% patency (median follow-up 31 months). In conclusion, we discourage others from using arm veins in aortocoronary bypass operations.

Aged↗
PubMed1995

Differentiated carcinoma of the thyroid with extrathyroidal extension.

BACKGROUND: We have analyzed our experience with differentiated thyroid cancer patients with extrathyroidal extension (ETE) to investigate patterns of recurrence and define factors that predict failure. PATIENTS AND METHODS: The records of 1,012 patients treated surgically from 1930 to 1985 were reviewed. A total of 79 patients (8%) had ETE. The median length of follow-up was 10 years. RESULTS: Patients with ETE were more likely to fail treatment and to die of their disease than were patients without ETE (77% versus 34% and 71% versus 13%, respectively; P < 0.0001). Local, regional, and distant failures were more prominent among patients with ETE than among those without ETE (48% versus 9%, 41% versus 16%, and 37% versus 11% respectively; P < 0.0001). Survival of patients with ETE was adversely affected by nonpapillary histology, distant metastasis, age > 45, tumor size > 4 cm, and incomplete excision (P < or = 0.05). After stratification for age, survival in older patients was not affected by tumor size or incomplete excision, while in younger patients tumor size or the presence of distant metastasis did not adversely affect survival. Patients younger than 45 with negative margins had similar survival to patients without ETE (P = 0.46). CONCLUSIONS: Patients with ETE are more likely to die of their disease and to fail at all sites. Survival in older patients was not affected by incomplete excision while it was in younger patients. The presence of distant metastasis did not affect survival in younger patients. Our results suggest that among patients under 45, the presence of ETE does not adversely impact upon survival when the primary tumor is completely resected.

Adenocarcinoma↗
PubMed1994

[Recanalization of occluded coronary arteries with percutaneous transluminal coronary angioplasty].

Percutaneous transluminal coronary angioplasty (PTCA) was attempted in 56 totally occluded coronary arteries. The occlusions were estimated to be between two weeks to six months old, less than 4 cm long and accessible to PTCA. Primary technical success was achieved in 40 cases (71%) with best results if the time from AMI to PTCA was less than six months. Twenty-six patients were without recurrence in the follow-up period which was longer than six months. In the follow-up period eight patients had re-PTCA performed and six had coronary artery bypass grafting (CABG). There were significantly more patients in the group of failed PTCA who had CABG than in the group of successful PTCA. At clinical follow-up examination 23 patients (41%) were free of symptoms and seven (13%) had less pain than before PTCA. One patient died in heart failure (mortality 1.8%) within 24 hours after failed PTCA. PTCA of totally chronically occluded coronary arteries is a method with acceptable good primary success, especially if the occlusion is not too old. There is a good symptomatic effect if the PTCA is successful. The procedure reduces the need for CABG and is associated with few complications in stable angina pectoris. PTCA is cheaper and less traumatic for the patients and with much shorter recovery period compared to CABG. PTCA is considered indicated in total chronic occlusions in selected cases.

Angioplasty, Balloon, Coronary↗
PubMed1994

The impact of patterns of nodal metastasis on modifications of neck dissection.

BACKGROUND: Radical neck dissection (RND) is standard treatment for cervical metastasis from head and neck cancer. Although effective, RND produces significant morbidity. In an effort to reduce this morbidity, modifications of RND have been developed. These modifications can be comprehensive yet spare some or all of the nonlymphatic structures removed in RND, or they can remove less than all the lymph node groups removed in RND and are termed selective neck dissections. We have reviewed the literature regarding the patterns of nodal metastasis from head and neck cancer to define the indications for these modifications of RND. METHODS: A review of the literature concerning patterns of nodal metastasis from head and neck cancer was performed. Using this information, recommendations on the use of modifications of neck dissection were formulated. RESULTS: In squamous cancers, with clinically negative neck supraomohyoid neck dissection is an adequate node sampling procedure for oral cavity and oropharyngeal lesions, and lateral (jugular) neck dissection for primary lesions of the hypopharynx, and larynx. In the clinically positive neck comprehensive neck dissection with preservation of the spinal accessory nerve is oncologically sound. CONCLUSIONS: Nodal metastasis of head and neck cancer occurs in predictable patterns. Based on these patterns of nodal metastasis, recommendations for the use of modifications of neck dissection are presented.

Head and Neck Neoplasms↗
PubMed1994

Cardiac troponin T and CK-MB mass release after visually successful percutaneous transluminal coronary angioplasty in stable angina pectoris.

The incidence of cardiac troponin T (Tn-T) and creatine kinase (CK) isoenzyme MB mass release was studied in 23 patients with stable angina pectoris undergoing visually successful percutaneous transluminal coronary angioplasty (PTCA). Serial blood samples were drawn for measurement of serum Tn-T, CK-MB mass, total CK activity, CK-MB activity, and lactate dehydrogenase isoenzyme (LD-1). ST segment monitoring was carried out during PTCA and for the following 24 hours. None of the patients showed electrocardiographic (ECG) evidence of myocardial infarction. However, Tn-T was elevated in three patients (0.23 to 1.32 micrograms/L), and in these three and an additional three patients CK-MB mass was also elevated (7.0 to 27.5 micrograms/L). Total CK activity and LD-1 were only elevated in one of these six patients. None had elevated CK-MB activity. ST segment depression on ECG recording was not predictive of Tn-T or CK-MB mass release. Patients with elevated Tn-T or CK-MB mass did not differ with respect to demographic data, stenosis characteristics, or in the PTCA procedure. We conclude that CK-MB mass uncovers clinically and ambulatory electrocardiographically inapparent severe myocardial ischemia/minor myocardial damage (microembolization) in 26% (6 of 23) of patients after visually successful PTCA; 13% (3 of 23) had elevated Tn-T, indicating minor myocardial damage. The application of these markers in the future could be of considerable value for determining the efficacy of coronary angioplasty and atherectomy, as well as for drug therapy in connection with such procedures.

Adult↗
PubMed1994

The role of comprehensive neck dissection with preservation of the spinal accessory nerve in the clinically positive neck.

BACKGROUND: The most significant prognostic factor in patients with squamous cell carcinoma of the head and neck is the presence of cervical nodal metastases. Radical neck dissection is the standard by which all cervical lymphadenectomy procedures are judged. In the presence of clinically positive nodal metastasis, the benefit of preserving the spinal accessory nerve (SAN) has to be weighed against the possible risk of increased failure in the neck. We performed this retrospective study to determine if preservation of the SAN in patients with clinically evident nodal metastases was associated with increased risk of failure in the dissected neck. PATIENTS AND METHODS: Between January 1, 1984 and December 31, 1991, 378 comprehensive neck dissections were performed in 366 patients with clinically and pathologically positive nodal metastases from squamous carcinoma of the upper aerodigestive tract. We compared survival, neck control rates, and other factors in patients who had a classic radical neck dissection (RND) to those who had modified radical neck dissection sparing only the SAN (MRND I). RESULTS: Actuarial 5-year survival and neck failure rates for the RND group were 63% and 12%, compared to 71% and 8% for the MRND I group (P = NS). Survival and neck failure were not statistically different between the MRND I and RND groups when the analysis controlled for pathologic N stage, presence of extra capsular spread, and the presence of pathologically demonstrated metastatic nodes along the course of the SAN. Nor were there significantly different patterns of neck failure with RND versus MRND. CONCLUSION: Modification RND to preserve an uninvolved SAN in the clinically positive neck does not adversely affect survival or neck control.

Accessory Nerve↗
PubMed1993

Transient myocardial ischemia during nifedipine therapy in stable angina pectoris, and its relation to coronary collateral flow and comparison with metoprolol.

There are conflicting results concerning the anti-ischemic effect of nifedipine in patients with chronic stable angina. Therefore, the purpose of this study was to assess whether the anti-ischemic effect of nifedipine may be related to coronary collateral circulation. Forty-one patients with stable angina and coronary artery disease were randomized to a parallel double-blind study with nifedipine and metoprolol, and compared for effects on transient ischemic episodes during ambulatory electrocardiographic monitoring and exercise-induced ischemia. The effects were correlated to the presence of collateral circulation. In 17 patients, angiographically poor or no collateral flow was observed (group 1), and 24 had good collateral flow (group 2). Nifedipine was administered to 20 patients (8 in group 1, and 12 in group 2). In group 1, nifedipine reduced the frequency of total and asymptomatic ischemic episodes (p < 0.05), whereas significant increases in both total (p < 0.05) and silent (p < 0.01) ischemia were observed in group 2. Exercise variables were slightly improved (p = NS) during nifedipine therapy in group 1, and slightly worsened (p = NS) in group 2. Reflex tachycardia was not observed at either the onset of transient ischemia out of the hospital or exercise-induced ischemia. This was in contrast with the effect in 21 patients treated with metoprolol (9 in group 1, and 12 in group 2) where significant reductions were observed in the frequency of both total (p < 0.01) and silent (p < 0.01) ischemia in both groups. Furthermore, a beneficial effect was observed on all exercise variables.(ABSTRACT TRUNCATED AT 250 WORDS)

Angina Pectoris↗
PubMed1993

Iodixanol and ioxaglate in cardioangiography: a double-blind randomized phase III study.

A new non-ionic, dimeric contrast medium iodixanol (Nycomed AS, Norway) has a very low osmolality and is isotonic with blood. It has been compared with ioxaglate (Hexabrix, Laboratoire Guerbet, France) in a double-blind, randomized, parallel trial. The aims of the trial were to evaluate and compare the safety (vital signs, adverse events, discomfort and clinical-chemical parameters in blood and urine) and radiographic efficacy (diagnostic information and radiographic density) of iodixanol 320 mg I/ml vs ioxaglate (Hexabrix 320 mg I/ml) in coronary angiography and left ventriculography. Seventy-six patients referred for cardioangiography, two patients were withdrawn, 36 receiving iodixanol and 38 ioxaglate were included in the trial. Six patients (16%) in the iodixanol group and 16 (42%) patients in the ioxaglate group reported adverse events (P = 0.02). One serious adverse event occurred in the iodixanol group where a patient experienced transient cortical blindness and transitory global amnesia, but the patient recovered completely the day after the examination. Twenty-six patients reported injection-associated sensation of warmth in the iodixanol group versus 34 in the ioxaglate group (P = 0.06). Following contrast injection there were no differences between the groups regarding vital signs (ECG, heart rate, left ventricular pressures). Both contrast media were well tolerated by the kidneys, and on average only minor effects on clinical-chemical parameters in blood and urine were observed in the two groups. The radiographic efficacy was good in both groups.

Adolescent↗
PubMed1993

The hemodynamic and prognostic significance of echo-Doppler-proven mitral regurgitation in patients with dilated cardiomyopathy.

Data from cardiac catheterization at rest and during exercise in 57 patients with dilated cardiomyopathy (DCM) were analyzed to evaluate the bearing of mitral regurgitation (MR) detected by color Doppler echocardiography (CDE) on prognostically important invasive hemodynamic parameters and survival. The etiology of DCM was coronary artery disease in 21 patients and unproven ('idiopathic') in 36 patients. MR was detected by CDE in 34 patients (60%) with an agreement of 93% compared to left ventriculography. Mean age, etiology of DCM and duration of symptoms were similar in patients with and without MR, while patients with MR were in a higher NYHA class, had lower ejection fraction (LVEF) (25 +/- 13 vs. 35 +/- 17%; p < 0.02), larger left ventricular volumes (356 +/- 138 vs. 268 +/- 61 ml; p < 0.01) and higher left ventricular end-diastolic pressure (LVEDP) (21 +/- 9 vs. 13 +/- 7 mm Hg; p < 0.01). At rest, right-sided pressures were higher in patients with MR compared to patients without MR (pulmonary wedge pressure 20 +/- 9 vs. 10 +/- 3 mm Hg, mean pulmonary arterial pressure 30 +/- 11 vs. 20 +/- 8 mm Hg, mean right atrial pressure 9 +/- 4 vs. 4 +/- 2 mm Hg, all p < 0.001), but no significant differences were found in cardiac index (CI) or stroke index (SI).(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1992

Rapid estimation of left ventricular ejection fraction in acute myocardial infarction by echocardiographic wall motion analysis.

Echocardiographic estimates of left ventricular ejection fraction (ECHO-LVEF) in acute myocardial infarction (AMI) were obtained by a new approach, using visual analysis of left ventricular wall motion in a nine-segment model. The method was validated in 41 patients using radionuclide ventriculography (RNV) and contrast ventriculography measurements of LVEF for comparison. ECHO-LVEF from the 41 patients correlated well with the reference methods (y = 1.5x - 14.7, r = 0.93; linear regression analysis; 95% confidence limit for a single determination of ECHO-LVEF was 17.2). Interobserver variability by linear regression was r = 0.89, SEE = 7.1 with a mean difference between paired observations of -1.5 +/- 6.9 (SD). In a random sample of 18 patients (45 observations), ECHO-LVEF allowed separation between RNV-LVEF values greater than or equal to 40 and less than 40, representing low and high risk groups following AMI. Thus, the results showed that simple, readily available wall motion-derived estimates of LVEF were as closely associated with LVEF measured by standard reference methods as were previously published, more cumbersome, planimetric echocardiographic methods. Reporting on global LVEF function in LVEF units rather than in nonstandardized wall motion scores of index values may facilitate intra- and interhospital communication and the use of optimized echocardiographic risk stratification after AMI.

Echocardiography↗