COVID-19: Clinical Course and Outcome of hospitalized Hemodialysis Patients: Single-center Experience

BACKGROUND

There is a paucity of data regarding the consequences of coronavirus disease 2019 (COVID-19) infection in patients with maintenance hemodialysis (MHD). Our objective was to identify the clinical manifestations and prognostic factors and to assess the impact of treatment schemes on the outcomeMaterials and methods: Here we present retrospectively collected data from medical records of patients on MHD hospitalized with COVID-19 infection from 1st June to 30th November 2020Result: Around 69 patients were admitted with a median age of 51 years. About 81% had hypertension, 41% had diabetes, and 24% had body mass index (BMI) ≥ 23 kg/m2 . Of all who died, 73.33% had dialysis vintage of <12 months (p = 0.06). Common presenting symptoms were fatigue (67%), fever (58%), cough (42%), and dyspnea (35%). Milder, severe, and critical disease was found in 35, 45, and 20% of patients, respectively. About 54 patients were living 4 weeks after discharge. Around 15 patients died, that includes all who received invasive ventilatory support. Nonsurvivors were older and had lower oxygen saturation on admission, lower hemoglobin (Hb), and worst lactate dehydrogenase (LDH), interleukin (IL)-6, and D-dimer values than survivors, which were statistically significant. Use of remdesivir and anticoagulant improves chances of survival (p-value 0.035 and 0.034, respectively) Conclusion: About one-third of patients had mild disease. Those with critical disease displayed high mortality. Older age, male gender, short dialysis vintage, lower oxygen saturation on admission, anemia, leucocytosis, higher inflammatory markers [except C-reactive protein (CRP)], bilateral lung opacity, and requirement of the mechanical ventilator are poor prognostic factors. CRP, ferritin, and lymphopenia are not good prognostic markers unlike in the general population. These findings need to be verified in larger cohorts.

Safety and Tolerability of Remdesivir in Patients with End-stage Renal Disease on Maintenance Hemodialysis

Introduction

The use of remdesivir is not recommended in patients with end-stage renal disease (ESRD) with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection unless potential advantage offset disadvantage due to limited safety data. Our objective was to assess the safety of remdesivir in patients with end-stage renal failure and evaluate the outcome of this vulnerable group.

Methodology

We carried out a retrospective observational study in dialysis-dependent ESRD patients with SARS-CoV-2 infection who received a standard 5-day course of remdesivir (powder form) from June 2020 to December 2020. Oxygen requirement, hemogram, inflammatory markers, and liver function tests before and after remdesivir treatment were compared.

Result

We found thirty-nine such patients with mean age of patients 58.79 ± 12.13 years. Diabetes mellitus, hypertension, and cardiac diseases were present in 58.97, 87.17, and 23.07% of patients, respectively. Mean oxygen saturation on admission was 85.41% (±7.73). There were no events of hepatotoxicity, altered behavior, or infusion reaction. There was statistically significant improvement in total leukocyte count, absolute lymphocyte counts, and C-reactive protein (p value <0.001, 0.01, and 0.02, respectively) post remdesivir treatment. A total of 60% of patients had improved oxygenation while 13% of patients had no change in oxygen requirement after completion of remdesivir course. Mortality in our study was 28.21%. We did not find any significant benefit of early remdesivir administration (3–6 days of illness) on mortality or days of hospitalization.

Conclusion

The use of remdesivir in end-stage kidney disease is safe. Improvement in oxygenation was significant when baseline oxygen requirement was less. It requires prospective controlled trials with larger population to assess its impact on mortality.

How to cite this article

Shah MK, Parikh M, Prajapati D, Kute VB, Bhende P, Prajapati A, et al. Safety and Tolerability of Remdesivir in Patients with End-stage Renal Disease on Maintenance Hemodialysis. Indian J Crit Care Med 2022;26(5):619–625.

Ofloxacin Induced Hemolysis in G6PD-deficient Patient: A Rare Cause of Pigment Nephropathy

Thrombotic microangiopathy (TMA) commonly presents as a triad of acute kidney injury (AKI), jaundice, and hemolysis; however, tropical infections such as malaria, dengue, leptospira, and drugs like antimalarials can also have a similar presentation. They can cause AKI for many reasons including pre-renal causes but an important yet not relatively uncommon genetic cause of hemolytic anemia, that is, glucose 6-phosphate deficiency (G6PD) manifesting as jaundice, hemolysis, and AKI secondary to pigment nephropathy after receiving offending drugs needs to be worked up while evaluating such patients. Ofloxacin is not usually included in the lists of unsafe drugs in G6PD deficiency. Herein, we report a patient developing intravascular hemolysis secondary to G6PD deficiency associated with ofloxacin administration presenting as a rare cause for pigment nephropathy.

Pain and gastrointestinal dysfunction are significant associations with psychiatric disorders in patients with Ehlers-Danlos syndrome and hypermobility spectrum disorders: a retrospective study

In this retrospective study, we investigate the frequency and types of psychiatric disorders and their relationship to systemic manifestations in a cohort of 391 Ehlers-Danlos syndromes (EDS) and hypermobility spectrum disorder (HSD) patients based on the current 2017 International Classification of EDS diagnostic criteria. A detailed, systematic retrospective chart review was undertaken for patients assessed for HSD or EDS at two Canadian health centres. Patients were diagnosed according to the Villefranche criteria and reclassified for this study according to the 2017 International Classification of EDS. Data validation and statistical analyses were conducted. Psychiatric disorders were very common, with 49.4% of the total cohort affected; 28.9% reported multiple psychiatric diagnoses. Mood (34.5%) and somatoform (28.6%) disorders were most common. Interestingly, attention-deficit/hyperactivity disorder (ADHD) was significantly enriched in the HSD, but not EDS cohort (p = 0.0002, 95% CI 3.48-9.00) compared to the general population. There were no differences in the systemic associations with having psychiatric manifestations in the HSD compared to the EDS subsets. Muscle/body pain (OR 1.99) and gastrointestinal dysfunction (OR 2.07) were significantly associated with having mood disorders, and gastrointestinal dysfunction (OR 2.61) and nerve-related pain (OR 3.27) were associated with having somatoform disorders across the cohort. The common systemic associations with the presence of psychiatric manifestations in both HSD and EDS reaffirm that the conditions should be treated as a spectrum rather than as wholly separate entities, particularly with respect to psychiatric management. EDS and HSD patients share common psychiatric presentations, though ADHD is more common with HSD.

Symmetrical peripheral gangrene following snake bite

SPG (Symmetrical peripheral gangrene) is defined as symmetrical distal ischemic damage at two or more sites in the absence of large vessels obstruction. It has been ascribed to a number of infectious and non infectious conditions including connective tissue, cardiovascular, neoplastic and iatrogenic causes. We report a unique case of SPG in a 35-year-old Indian female who developed spontaneous gangrene of the distal phalanges of the right and left index, middle, ring and little fingers and the distal phalanges of all toes of the right and left foot following a snake bite. There have been very few cases of peripheral gangrene and acute renal failure associated with snake bite in literature.

An unknown complication of peripherally inserted central venous catheter in a patient with ventricular assist device

We report an unknown complication of peripherally inserted central venous catheter in a patient with Ventricular Assist Device. This rare complication led to the failure of the right ventricular assist device, which could be detrimental in patients with dilated cardiomyopathy.

Sonographic assessment of arterial frequency and distribution within the brachial plexus: a comparison with the cadaveric record

We investigated the number and distribution of arteries within the brachial plexus territory using a portable ultrasound device, and compared these findings with known cadaveric data. We recruited 200 volunteers and carried out 400 brachial plexus examinations in a prospective observational study design. We identified arteries within the brachial plexus in more than 90% of subjects. Most of these were located in the upper and middle zones of the plexus and therefore lie within the possible path of a block needle. These findings correlate well with previous cadaveric studies, suggesting that arteries within the brachial plexus territory can be reliably identified with a portable ultrasound device. The presence of these vessels may impact upon the safety and efficacy of brachial plexus blockade. Routine pre-procedural sonographic assessment may offer improved safety and efficacy. You can respond to this article at http://www.anaesthesiacorrespondence.com.

Extended treatment duration for treatment naïve chronic hepatitis C genotype 1 late viral responders: a meta-analysis comparing 48 weeks vs 72 weeks of pegylated interferon and ribavirin

Patients with genotype I chronic hepatitis C virus (HCV) infection with late virological response to therapy have low sustained viral response (SVR) with standard 48 weeks of therapy and may benefit from extended therapy. We performed a systematic review and meta-analysis of five studies to compare the outcome of 48 weeks vs 72 weeks treatment in treatment naïve chronic hepatitis C genotype I patients with late virological response. The end of treatment response with extended 72 weeks of treatment compared to standard 48 weeks of treatment was similar 48% and 56%, respectively, with pooled odds ratio (OR) (0.85; 95% CI 0.52-1.37). However, the SVR rates were higher with 72 weeks of treatment compared to 48 weeks treatment 32%vs 25% with pooled OR of 1.67 in favour of extended duration therapy (95% CI 1.16-2.40). This was because of lower relapse rates with extended duration therapy (35%vs 55%) with OR of 0.39 in favour of 72 weeks therapy (95% CI 0.25-0.61). There was no heterogeneity. No publication bias was noted as assessed by Egger's test. Extending the treatment duration from 48 to 72 weeks in genotype 1 infected patients with late virological response improves SVR. Thus, therapy extension in genotype 1 late viral responders (LVR) may be a consideration to improve treatment response; however, the proportion of patients with LVR that might benefit from 72-week therapy appears to be small.

Novel H1N1-associated rhabdomyolysis leading to acute renal failure

The WHO recently declared that the novel influenza H1N1 virus was responsible for the 2009 flu pandemic. As the virus continues to spread globally and affect more individuals, more complications of infection with this virus are being recognized. To our knowledge, we report the first case of H1N1-induced rhabdomyolysis leading to acute renal failure in an adult. This case highlights the importance of recognizing a significant extrapulmonary complication of H1N1 infection.

Sticks and stones may break my bones: work-related orthopaedic injuries sustained during obstetrics and gynaecology training

Backache is a common cause of morbidity among doctors and 50% of the obstetricians and gynaecologists suffering from this attribute it to work practice and posture. Occupational injuries remain poorly studied among obstetricians and gynaecologists and we have therefore tried to assess the extent and demographics of work-related injuries sustained during training by sending an eight-item questionnaire to 418 Registrar grade trainees in the London area. A low 23.2% response rate (97/418) was obtained, despite second questionnaires being sent to initial non-responders. Out of the 97 responders, 28 (28.7%) had suffered injuries at work at least once throughout their career. There was female preponderance in those reporting injuries, with a female to male ratio of 3:1. Of the 28 positive responders, 11 were UK graduates, 7 EU and the remaining 10 from Colombia, West Indies, India and Sudan. The mean age was 32.5 +/- 4.2 years, with 21 of the 28 (75%) being senior trainees (post-MRCOG). The injuries reported were: forearm (4); wrist (7); thumb (3); hands (1) shoulder and neck (9), ankle (1) and lower back (6). Of these, 18 sought medical help and received treatment for these injuries, which included long-term physiotherapy, although no-one required surgery. Eight were forced to take time off work, with a cumulative total of 80 days; one had to prolong her training by 3 months. Seven trainees sustained their injuries (e.g. ligamentous strain of wrist and scaphoid fracture) while performing caesarean sections, while forceps deliveries were the cause of six occupational injuries (e.g. ligamentous strain of sacroiliac joint). Work-related injuries can have adverse effects on training and workforce. Awareness of correct surgical techniques and adoption of ergonomic posture when performing procedures may help to minimise the risk of a work-related injury.

Laparoscopic adjustable gastric banding for patients with body mass index of <or=35 kg/m2

BACKGROUND

Many mild-to-moderately obese individuals (body mass index [BMI] 30-35 kg/m(2)) have serious diseases related to their obesity. Nonoperative therapy is ineffective in the long term, yet surgery has never been made widely available to this population.

METHODS

Between 1996 and 2004, 93 patients with a BMI of 30-35 kg/m(2) underwent laparoscopic adjustable gastric banding with the LAP-BAND. All patients were referred by their primary physician, entered into a comprehensive bariatric surgery program at one Australian center, and operated on by one surgeon. Data on all patients were collected prospectively and entered into an electronic registry. The study parameters included preoperative age, gender, BMI, presence of co-morbidities, percentage of excess weight loss, and resolution of co-morbidities.

RESULTS

The mean age was 44.6 years (range 16-76), mean weight was 98 kg, and the mean BMI was 32.7 kg/m(2) (range 30-34). Of the 93 patients, 42 (45%) had co-morbidities, including asthma, diabetes, hypertension, and sleep apnea. The proportion of patients in follow-up was 79%, 85%, and 89% at 1, 2, and 3 years, respectively. The mean weight was reduced to 71 kg at 1 year, 72 kg at 2 years, and 72 kg at 3 years. The mean BMI was reduced to 27.2 +/- 2.2, 27.3 +/- 3.1, and 27.6 +/- 3.7 kg/m(2), respectively, and the mean percentage of excess weight loss was 57.9% +/- 24.5%, 57.6 +/- 29.3%, and 53.8% +/- 32.8% at 1, 2, and 3 years, respectively. At 3 years, the BMI was 18-24 kg/m(2) in 34%, 25-29 kg/m(2) in 51%, and 30-35 kg/m(2) in 10%. At 3 years, the percentage of excess weight loss was <25% in 10%, 25-50% in 24%, 50-75% in 51%, and >75% in 10%. The co-morbidities improved or completely resolved in most patients. No mortality occurred.

CONCLUSION

We are very encouraged by this series of low BMI patients treated with the LAP-BAND. Their weight loss has been good, the complications have been minimal, and the co-morbidities have partially or wholly resolved. With additional study, it is reasonable to expect the weight guidelines for bariatric surgery to be altered to include patients with a BMI of 30-35 kg/m(2).

Simulect induction facilitates neoral-based steroid-free immunosuppression in primary kidney transplant recipients

This study compares outcomes of kidney transplantation with two distinct induction protocols Basiliximab (Simulect) versus Muromonab (OTK 3) in the setting of cyclosporine (Neoral)-based immunosuppression. Postinduction protocols included either total prednisone avoidance or prednisone sparing versus standard prednisone dosing. Two hundred forty five adult patients receiving kidney transplantation between 1995 and 2000 were included in the study. Treatment in group 1 was OKT 3 + Neoral + adjunct + standard prednisone; group 2, Simulect + Neoral + adjunct + steroid sparing; group 3, Simulect + Neoral + adjunct + no prednisone. The demographics between all groups were similar. The mean (+/- SD) trough cyclosporine levels at 1 month were 276 +/- 128 versus 291 +/- 180 versus 398 +/- 365 (P=.020); at 3 months were 261 +/- 120 versus 280 +/- 152 versus 399 +/- 408 (P=.32); at 12 month were 235 +/- 144 versus 245 +/- 154 versus 234 +/- 132 (P=.96). Creatinine clearance at 1 month was 59 +/- 24 versus 58 +/- 18 versus 47 +/- 23 mL/min (P=.004); at 3 months was 66 +/- 28 versus 62 +/- 22 versus 53 +/- 25 mL/min (P=.007); at 12 months was 68 +/- 38 versus 65 +/- 22 versus 64 +/- 29 mL/min (P=.556). Serum creatinine at 1 month was 1.8 +/- 0.9 versus 1.6 +/- 1.2 versus 2.8 +/- 2.21 mg/dL (P=.005); at 3 months was 1.7 +/- 0.6 versus 1.9 +/- 1.0 versus 2.3 +/- 1.3 mg/dL (P=.007); at 12 months was 1.9 +/- 1.3 versus 2.1 +/- 1.0 versus 2.3 +/- 1.7 mg/dL (P=.179). The incidence of acute rejection within 1 year in the respective groups were 28% versus 15% versus 16%. Therefore, we conclude that using Simulect in transplant recipients results in long-term patient and graft survival similar to those achieved with OKT 3. The use of Simulect resulted in significant reduction in clinical rejection incidence within the first year regardless of steroid use. Thus, the use of Simulect allows complete steroid avoidance in Neoral-based immunosuppression regimen.

Heterocyclic derivatives of 2-(3,5-dimethylphenyl)tryptamine as GnRH receptor antagonists

A series of heterocyclic 2-(3,5-dimethylphenyl)tryptamine derivatives was prepared and evaluated on a rat gonadotropin releasing hormone receptor assay. The carbon tether length and heterocyclic ring attached to the amino group of 2-(3,5-dimethylphenyl)tryptamine were varied. Several of these derivatives were potent GnRH antagonists with the most potent compound having an IC50 of 16 nM.

A potent, nonpeptidyl 1H-quinolone antagonist for the gonadotropin-releasing hormone receptor

Extensive development of the structure-activity relationships of a screening lead determined three important pharmacophores for gonadotropin-releasing hormone (GnRH) receptor antagonist activity. Incorporation of the 3,4,5-trimethylphenyl group at the 3-position, 2-(2(S)-azetidinyl)ethoxy group at the 4-position, and N-4-pyrimidinylcarboxamide at the 6-position of the quinolone core resulted in the identification of 4-(2-(azetidin-2(S)-yl)ethoxy)-7-chloro-2-oxo-3-(3,4,5-trimethylphenyl)-1,2-dihydroquinoline-6-carboxylic acid pyrimidin-4-ylamide (1) as a potent antagonist of the GnRH receptor. A 10(4)-fold increase in in vitro binding affinity is observed for the GnRH receptor as compared to the initial screening lead. Compound 1 exhibits nanomolar binding activity and functional antagonism at the human receptor and is 7-fold less active at the rhesus receptor. Intravenous administration of compound 1 to rhesus monkeys results in a significant decrease of the serum levels of downstream hormones, luteinizing hormone (79% decrease in area under the curve) and testosterone (92% decrease in area under the curve), at a dose of 3 mg/kg. Quinolone 1 is a potent nonpeptidyl antagonist for the human GnRH receptor that is efficacious for the suppression of luteinizing hormone and testosterone in primates.

Focal angiogen therapy using intramyocardial delivery of an adenovirus vector coding for vascular endothelial growth factor 121

BACKGROUND

Adenovirus (Ad) vector-mediated gene therapy strategies have emerged as promising modalities for the "biological revascularization" of tissues. We hypothesized that direct intramyocardial, as opposed to intracoronary, administration of an Ad vector coding for the vascular endothelial growth factor 121 cDNA (Ad(GV)VEGF121.10) would provide highly focal Ad genome levels, and increases in VEGF, ideal for inducing localized therapeutic angiogenesis.

METHODS

Persistence and regional distribution of the vector were assessed by TaqMan real-time quantitative polymerase chain reaction technology and enzyme-linked immunosorbent assay, after intramyocardial Ad(GV)VEGF121.10 in the rat, and either intramyocardial or intracoronary (circumflex territory) vector in Yorkshire swine. Based on these results, we assessed the focal nature of the improved cardiac blood flow in a previously reported porcine myocardial ischemia model.

RESULTS

Intramyocardial delivery of Ad(GV)VEGF121.10 in the rat resulted in local persistence of the Ad genome that decreased 1,000-fold over 3 weeks, with peak myocardial VEGF expression 24 to 72 h after vector delivery. After intramyocardial Ad(GV)VEGF121.10 in the circumflex distribution of pigs, Ad vector genome and VEGF protein levels were more than 1,000-fold and more than 90-fold higher, respectively, in this distribution than in other myocardial regions. In comparison, intracoronary injection yielded maximum myocardial Ad genome and VEGF levels 33-fold and 9-fold lower, respectively, than that after intramyocardial delivery. Angiograms obtained 28 days after intramyocardial Ad(GV)VEGF121.10 demonstrated rapid circumflex reconstitution via collaterals localized to the region of vector administration.

CONCLUSIONS

These studies demonstrate that direct intramyocardial administration of Ad(GV)VEGF121.10 results in focal genome and VEGF levels, including focal angiogenesis, sufficient to normalize blood flow to the ischemic myocardium, findings that are relevant to designing human trials of gene therapy-mediated cardiac angiogenesis.

Effectiveness of aspirin and clopidogrel combination therapy in coronary stenting

Two hundred fifty consecutive patients underwent coronary stenting and received a 2-week course of clopidogrel (75 mg orally each day after a loading dose of 150 mg) and aspirin. There was 1 (0.4%) in-hospital death, 1 (0.4%) acute stent thrombosis, and 2 (0.8%) subacute stent thromboses. There were no Q-wave myocardial infarctions, vascular complications, or repeat interventions at 30-day follow-up.

Angiogenesis gene therapy: phase I assessment of direct intramyocardial administration of an adenovirus vector expressing VEGF121 cDNA to individuals with clinically significant severe coronary artery disease

BACKGROUND

Therapeutic angiogenesis, a new experimental strategy for the treatment of vascular insufficiency, uses the administration of mediators known to induce vascular development in embryogenesis to induce neovascularization of ischemic adult tissues. This report summarizes a phase I clinical experience with a gene-therapy strategy that used an E1(-)E3(-) adenovirus (Ad) gene-transfer vector expressing human vascular endothelial growth factor (VEGF) 121 cDNA (Ad(GV)VEGF121.10) to induce therapeutic angiogenesis in the myocardium of individuals with clinically significant coronary artery disease.

METHODS AND RESULTS

Ad(GV)VEGF121.10 was administered to 21 individuals by direct myocardial injection into an area of reversible ischemia either as an adjunct to conventional coronary artery bypass grafting (group A, n=15) or as sole therapy via a minithoracotomy (group B, n=6). There was no evidence of systemic or cardiac-related adverse events related to vector administration. In both groups, coronary angiography and stress sestamibi scan assessment of wall motion 30 days after therapy suggested improvement in the area of vector administration. All patients reported improvement in angina class after therapy. In group B, in which gene transfer was the only therapy, treadmill exercise assessment suggested improvement in most individuals.

CONCLUSIONS

The data are consistent with the concept that direct myocardial administration of Ad(GV)VEGF121.10 to individuals with clinically significant coronary artery disease appears to be well tolerated, and initiation of phase II evaluation of this therapy is warranted.

Ankle fractures in diabetics

Ankle fractures are common and good results are expected. Insulin dependent diabetes mellitus is also common, and long-standing disease is associated with peripheral neuropathy. A trauma unit will inevitably receive patients with both problems. We describe two salutary lessons and suggest how our experience with diabetic neuroarthropathy might be avoided.

The importance of computer-assisted semen analysis and sperm function testing in an IVF program

OBJECTIVE

To study the relationship of sperm motion characteristics, sperm morphology, and hypo-osmotic swelling test with fertilization rates in vitro.

DESIGN

Computer-assisted measures of fresh seminal and processed sperm preparations, sperm morphology, and hypo-osmotic swelling test results were assessed for predicting fertilization by step-wise regression analysis.

SETTINGS

In vitro fertilization laboratory, department of infertility management, university affiliated-hospital.

INTERVENTIONS

None.

PATIENTS

One hundred and two couples who underwent IVF were studied.

MAIN OUTCOME MEASURES

Computer-assisted sperm motion variables in semen and following semen processing in capacitating media; hypo-osmotic swelling of sperm tails before and after semen processing; morphology of sperm before and after processing; fertilization of oocytes as evidenced by presence of two pronuclei as the end point.

RESULTS

Various sperm motion parameters, hypo-osmotic swelling test results, and normal morphology of sperm were directly correlated to fertilization as judged by the Karl-Pearsons test. However, in step-wise regression analysis, normal morphology of sperm from seminal fraction exhibited 61% correlation with fertilization rates (P < .001). In step 2, normal morphology along with percent motility exhibited a 64% correlation with fertilization rates (P < .001). In step 3, normal morphology, percent motility, and linearity showed a 67% correlation with fertilization rates (P < .001). The hypo-osmotic swelling test did not predict fertilization rates (regression coefficient = 0.066, P = 0.474). In the processed sample preparations, normal sperm morphology showed a 72% correlation with fertilization rate (P < .001). In step 2, normal morphology along with curvilinear velocity exhibited a 77% correlation with fertilization rates (P < .001). In step 3, normal morphology, curvilinear velocity, and average path velocity showed a 79% correlation with fertilization rates (P < .001). The hypo-osmotic swelling test did not predict fertilization rates (regression coefficient = 0.076, P = 0.512).

CONCLUSIONS

Morphology of sperm and computer-assisted sperm motion variables, such as motility, linearity, curvilinear velocity, and average path velocity, may serve as prognostic indicators for fertilization potential of sperm. The hypo-osmotic swelling test may describe only physiological intactness, rather than the fertilization potential of sperm. The results suggest that objective analysis of sperm motion characteristics and precise sperm morphology may form a first, and obligatory, step for critical evaluation of patients before they start IVF treatment.

Intracoronary stents

Interventional cardiology has undergone exciting changes since the first percutaneous transluminal coro-_ nary angioplasty was performed by Andreas Gruentzig in 1977.' Over the last several years, a variety of techniques have been developed which provide the interventional cardiologist with a range of options to treat coronary stenoses. In addition, the indications for intervention have radically changed since the original work by Gruentzig, who limited treatment to patients with a single focal stenosis in a large vessel. Advances in balloon angioplasty, as well as the development of new techniques such as directional atherectomy, laser angioplasty, rotational atherectomy, extraction atherectomy, and now intracoronary stents have given the interventional cardiologist the ability to treat multivessel disease, increasingly complex lesions, and less stable patients."

Evaluation of Graftskin composite grafts on full-thickness wounds on athymic mice

We used a living bilayered cultured skin replacement to close full-thickness wound defects on the dorsum of athymic mice. The skin replacement is composed of human fibroblasts that condense a bovine collagen lattice; the lattice is then seeded with cultured human keratinocytes. The collagen lattice with fibroblasts serves as a dermal template, and the overlying human keratinocytes form the epidermal component of this composite skin replacement. Twenty-four animals were grafted, and groups of six were killed and biopsied at 6, 15, 30, and 60 days after graft replacement. Twenty-four mice in the control group receiving grafts of fresh, split-thickness, human cadaver skin were biopsied at the same time points. "Take" of all grafts was excellent, with only one graft loss in the 48 mice (one Graftskin graft, at 15 days). Light microscopy revealed that vascular ingrowth into Graftskin occurred rapidly, and discrete dermal and epidermal layers were seen at all time points. Evidence of basement membrane formation was seen at 6 days after grafting by immunohistochemical staining for laminin and by electron microscopic visualization of lamina lucida and lamina densa zones at the dermal-epidermal junction. The results demonstrated that Graftskin formed a structurally complete skin replacement within 1 week of placement on full-thickness wounds on athymic mice, and effective skin coverage was provided for the 60-day observation period after grafting.

Gamekeeper's thumb

Gamekeeper's thumb is due to complete rupture of the ulnar collateral ligament; it should be clinically differentiated from incomplete rupture. Methods of diagnosis and treatment of gamekeeper's thumb are described. The results in 10 cases of gamekeeper's thumb treated by surgery, with more than a one-year follow-up are evaluated.

A Tunneling Spectroscopy Study of Molecular Degradation due to Electron Irradiation

Electron tunneling spectroscopy has been used to characterize the degradation of beta-D-fructose after electron bombardment in a scanning electron microscope. The decrease in intensity of various vibrational bands is correlated with structural changes in the molecule, thereby providing a detailed picture of the degradation process.