Combined cataract surgery and vitrectomy for breakthrough vitreous hemorrhage from age-related macular degeneration

PURPOSE: To report combined cataract extraction (CE), posterior chamber intraocular lens (PCIOL) implantation, and pars plana vitrectomy (PPV) for concurrent cataract and breakthrough vitreous hemorrhage from age-related macular degeneration (AMD). METHODS: Retrospective case series. RESULTS: Six eyes were included in the study. The postoperative follow-up interval ranged from 3 to 22 months (mean 8 months). Preoperative visual acuity (VA) ranged from 20/400 to hand motion. Postoperatively, 5/6 eyes had 2 or more lines of visual improvement. Three eyes were better than 20/200. CONCLUSIONS: Combined CE, PCIOL insertion, and PPV in selected patients with cataract and breakthrough vitreous hemorrhage from AMD was successful in improving VA in the majority of patients.     

Toxic neuropathy in patients with pre-existing neuropathy

The authors report significant worsening of a pre-existing neuropathy in six patients who received "non-toxic" dosages of known neurotoxic agents. Before treatment, baseline total neuropathy score (TNS) averaged 9.5 (range 0 to 19). After chemotherapy (Taxol [125 to 175 mg/m(2) x 4]; vincristine [2 to 5 mg]; cisplatin [40 mg/m(2) x 8]; and thalidomide [60 g]), the TNS averaged 22 (range 13 to 29). The authors conclude that functionally disabling toxic neuropathy can occur in patients with pre-existing neuropathy at standard doses.     

The need for a multidisciplinary approach to cancer care

BACKGROUND: Treatment of the cancer patient is multifaceted. In addition to treating the cancer itself, there are additional important, "noncancer" issues to consider concomitantly, such as the patient's coexistent diseases, their health behaviors, and preventive care measures. While the need for coordination among surgeons, oncologists, and radiation oncologists has been well documented for treatment of the cancer, little attention has been paid to the importance of "noncancer" issues. In an attempt to characterize such issues, we performed a study to describe the prevalence of comorbid diseases as well as other "noncancer" issues (i.e., presence of poor health habits and use of preventive care measures) for four common, surgically related cancers. Finally, we describe the use of provider resources for these cancer patients. METHODS: Using a large population-based, nationwide patient survey, a cross-sectional analysis of lung, prostate, breast, and colon cancer patients who were less than 3 years from their diagnosis was performed. Prevalence of comorbid disease, health behaviors, receipt of preventive health care services, and contact with the health care system were characterized. Comparisons were made with a cohort of age-matched controls without cancer. RESULTS: Three hundred one cancer patients (29 lung, 88 prostate, 119 breast, 65 colon) and 6745 control patients were analyzed. Among the cancer patients, 81% had a coexistent disease, with 59% reporting cardiovascular comorbidity and 17% reporting pulmonary comorbidity. The range of comorbidities was substantial: hypertension (24-48%), coronary disease (8-24%), angina (4-10%), myocardial infarction (8-31%), arrhythmia (8-19%), stroke (3-8%), emphysema (4-10%), asthma (5-12%), diabetes (8-18%), bronchitis (8-13%), renal insufficiency (3-6%), severe arthritic symptoms (34-57%). Of note, 27-39% of cancer patients continued to smoke tobacco (P = 0.03 vs controls), of whom 85% continued to smoke daily. Finally, the rates of preventive care influenza vaccinations in high-risk individuals for the cancer cohort was no higher than the rate in controls, even though the cancer patients saw a health professional significantly more often. Of note, the frequency of "specialists" and surgeon visits was significantly higher for the cancer cohort. CONCLUSION: To optimize cancer outcomes, successful treatment of both the cancer and the "noncancer" issues is required. This study demonstrates that the burden of coexistent diseases is considerable. We also found the prevalence of continued poor health behaviors (i.e., use of tobacco) as well as suboptimal performance of preventive care measures to be notable. Since cancer patients see specialists twice as often as controls, it appears paramount that specialists (surgeons included) maintain diligence in addressing patient comorbidities, health habits, and other "noncancer" measures. If the substantial rates of smoking and suboptimal performance of preventive care measures are an indication of the "noncancer" quality of care that is being provided to the typical cancer patient, then a more concerted effort by all providers needs to be made regarding these and other "noncancer" issues.     

Neuroendocrine carcinoma of the ethmoid sinus

The paranasal sinuses are a rare site for neuroendocrine carcinoma (NEC). In contrast to the other regions, NEC of the sinuses has been reported to be recurrent and locally destructive. We report a case of NEC of the ethmoid sinuses. The patient was a 16-year-old Indian boy and was treated with radiation therapy to 6500 rad. He has been disease free for the past 5 years. All the cases reported to date were also reviewed.Adapted from a presentation at the annual meeting of the American Academy of Otolaryngology Head and Neck Surgery, Inc., Washington, D.C., 13–17 September 1992     

The effect of ageing on the response to frusemide in normal subjects

Summary The effect of IV frusemide was studied in six healthy young (mean age 26.5 years, range 21–33) and six healthy old (mean age 72.8 years, range 66–80) volunteers. A 24-h urine collection before frusemide showed no difference in volume and sodium excretion, although the old excreted less potassium. Creatinine clearance was significantly reduced in the older subjects. After frusemide, 20 mg IV, the pattern of sodium and water excretion over a 5-h period was different in the two groups. The peak effect was greater in the young and occurred within the first 30 min, but was delayed to between 30 and 60 min in the old. Thus in the young the time for 50% of the total sodium and water to be excreted was half that in the old. This delay in sodium and water excretion was related to baseline creatinine clearance. However, the total water, sodium and potassium excreted in the 5 h after frusemide did not differ in the two groups. These results suggest that the renal effects of frusemide are different in healthy elderly subjects as compared to the young. The delayed and reduced peak response is consistent with fewer nephrons in the elderly kidney.     

The influence of stimulation parameters on the potency and reversibility of neuromuscular blocking agents

Summary Voluntary muscle movements in mammalian muscles are initiated by short trains of 16 to 60 Hz impulses (Zierler, 1974). Despite this in most neurophysiological and neuropharmacological studies either single stimuli of 0.1 to 2 Hz or 5 to 10 sec 50 to 500 Hz tetani have been employed. Neither of these two types of stimuli are ideal for the testing of the functional integrity of the motor unit. Stimulation with single impulses, at slow rates, does not reveal incipient pathological or drug induced defects. Recovery of neuromuscular (NM) activity after 5 to 10 sec tetanic stimulation is prolonged and after repeated stimulation of this type the preparations decay rapidly. Stimulation with 0.1 sec trains of 50 Hz impulses applied every 10 to 20 sec eliminate the above disadvantages. This type of stimulation represents adequate challenge for revealing more moderate degrees of functional defects of the myoneural apparatus without causing rapid decay of thein vitro orin vivo preparations. In agreement with this the ED₅₀ of NM blocking agents were found to be significantly lower in both thein vitro phrenic nerve-hemidiaphragm preparation and thein vivo sciatic nervetibialis anterior muscle preparation of rats during stimulation with 0.1 sec trains of 50 Hz impulses, than when single stimuli of 0.1 Hz were used. Recovery of thein vitro preparations after washout orin vivo after discontinuation of the infusion was also slower during stimulation with short trains of tetani. The antagonist potency of anticholinesterases or 4-aminopyridine and maximal recovery after the use of the optimal concentrations of these antagonists was less in the preparations stimulated with short trains of tetani than in those stimulated with single impulses.     

Comparison of myocardial preservation techniques for aortocoronary bypass surgery.

The myocardial properties of three different techniques for cardiac arrest during aortocoronary bypass surgery were analyzed. Ventricular fibrillation and moderate total body hypothermia (30–33°C) (Group I) was found to be an insecure method of preservation. It produced a high incidence of focal irreversible ultrastructural changes (7 of 10 patients), high post-bypass CK-MB levels (mean 85.54 U/liter) indicative of myocardial damage, and impaired clinical and physiologic recovery courses. Six out of ten patients needed inotropic support, three had prolonged stay in ICU, and three patients showed Type III (unacceptable) recovery trajectories, one of whom died of myocardial decompensation four weeks after surgery. This method, which was the most common one used in our institution, was completely abandoned as a result of these studies. Potassium induced cardioplegia combined with methylprednisolone sodium succinate, hypertonic glucose and intermittent moderate topical cooling (25–27°C) of the heart (Group III) offered a generally acceptable form of myocardial protection, as only one patient showed irreversible ultrastructural changes. The mean post-bypass CK-MB level was only moderately elevated (mean 22.32 U/liter), but seven of ten patients needed inotropic support. There were no Type III recovery trajectories and two patients showed an optimal Type I recovery. Only one patient had a prolonged stay in ICU, and another patient exhibited electrocardiographic evidence of a perioperative myocardial injury pattern. Selective intracavitary profound hypothermic arrest (15–18°C) (SIPHA) offered the best myocardial protection as evidenced by remarkably well preserved ultrastructure and significantly (P< 0.005) lower post-bypass CK-MB levels (mean 7.85 U/L). All SIPHA patients had acceptable physiologic recovery trajectories of the Type I or Type II with minimal need for inotropic support (one patient), and none had a Type III recovery.These data also suggest that the major determinant of a successful myocardial preservation is the level of myocardial layer temperature, being best at the lowest temperature (15–18°C), worst at the highest temperature (30–33°C) and intermediate at 25–27°C. Additional injury may also be induced by ventricular fibrillation which by itself increases myocardial metabolic demands.