1
|
Bin JH, Ji Q, Seidl PA, Raftrey D, Steinke S, Persaud A, Nakamura K, Gonsalves A, Leemans WP, Schenkel T. Absolute calibration of GafChromic film for very high flux laser driven ion beams. Rev Sci Instrum 2019; 90:053301. [PMID: 31153260 DOI: 10.1063/1.5086822] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2018] [Accepted: 04/13/2019] [Indexed: 06/09/2023]
Abstract
We report on the calibration of GafChromic HD-v2 radiochromic film in the extremely high dose regime up to 100 kGy together with very high dose rates up to 7 × 1011 Gy/s. The absolute calibration was done with nanosecond ion bunches at the Neutralized Drift Compression Experiment II particle accelerator at Lawrence Berkeley National Laboratory (LBNL) and covers a broad dose dynamic range over three orders of magnitude. We then applied the resulting calibration curve to calibrate a laser driven ion experiment performed on the BELLA petawatt laser facility at LBNL. Here, we reconstructed the spatial and energy resolved distributions of the laser-accelerated proton beams. The resulting proton distribution is in fair agreement with the spectrum that was measured with a Thomson spectrometer in combination with a microchannel plate detector.
Collapse
Affiliation(s)
- J H Bin
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - Q Ji
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - P A Seidl
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - D Raftrey
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - S Steinke
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - A Persaud
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - K Nakamura
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - A Gonsalves
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - W P Leemans
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| | - T Schenkel
- Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
| |
Collapse
|
2
|
Gonsalves A, Carrier M, Wells PS, McDiarmid SA, Huebsch LB, Allan DS. Incidence of symptomatic venous thromboembolism following hematopoietic stem cell transplantation. J Thromb Haemost 2008; 6:1468-73. [PMID: 18627443 DOI: 10.1111/j.1538-7836.2008.03077.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND The incidence of symptomatic venous thromboembolism (VTE) following hematopoietic stem cell transplantation (HSCT) is not well described, particularly with increased use of ambulatory care in the transplant setting. METHODS A retrospective analysis involving 589 patients (382 autologous HSCT, 207 allogeneic HSCT) undergoing transplantation between 2000 and 2005 in a single Canadian institution was undertaken to identify the incidence of proximal deep vein thrombosis (DVT) or pulmonary embolism (PE) in HSCT patients. RESULTS The total 1-year incidence of symptomatic VTE was 3.7% [95% confidence interval (CI) 2.5-5.6]. Among the HSCT patients, 7/589 (1.2%, 95% CI 0.6-2.4) developed symptomatic non-catheter-related VTE following HSCT (four PE and three DVT). All VTE events occurred after hematopoietic engraftment. Patients undergoing autologous HSCT did not receive thromboprophylaxis, whereas most patients undergoing allogeneic HSCT (79.7%) received enoxaparin 20 mg daily for the prevention of veno-occlusive disease of the liver, starting 6 +/- 3 days before transplantation for a mean of 22 +/- 14 days. CONCLUSION HSCT patients have a high incidence of VTE. Thromboprophylaxis should potentially be considered in these patients. However, future studies assessing the risk and benefits of thromboprophylaxis are needed in this specific population.
Collapse
Affiliation(s)
- A Gonsalves
- Blood and Marrow Transplant Program, The Ottawa Hospital, Ottawa, ON, Canada
| | | | | | | | | | | |
Collapse
|
3
|
Panakis N, Gonsalves A, Brada M. Technical Aspects of Radiotherapy for Non-small Cell Lung Cancer (NSCLC); a National Survey of Practice. Clin Oncol (R Coll Radiol) 2007. [DOI: 10.1016/j.clon.2007.01.406] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
4
|
Abstract
OBJECTIVE To assess the medium-term outcome in a cohort of patients with residual or recurrent pituitary adenoma treated with fractionated stereotactic conformal radiotherapy (SCRT). PATIENTS AND METHODS Ninety-two patients (median age 50 years) with a residual or recurrent nonfunctioning (67) or a secreting (25) pituitary adenoma were treated between 1995 and 2003. Eighteen patients had a GH-secreting, five PRL-secreting and two an ACTH-secreting pituitary adenoma. Vision was impaired in 39 patients, with visual field deficit (35) and/or reduced visual acuity (25). Sixty-four patients had partial or complete hypopituitarism before SCRT. The treatment was delivered stereotactically by four noncoplanar conformal fixed fields using a 6-MV linear accelerator to a dose of 45 Gy in 25 fractions. RESULTS At a median follow-up of 32 months (range 4-108) the 1, 3 and 5 years actuarial progression-free survival is 99%, 98% and 98%, and overall survival is 98%. Three patients recurred 5 months, 1 year and 9 years after SCRT requiring surgery. In secreting adenomas, hormone levels declined progressively, becoming normal in more than a third of patients with GH-secreting and PRL-secreting pituitary tumours. 50% of baseline GH level was achieved in just under 2 years. The treatment was well tolerated with minimal acute toxicity. Hypopituitarism was the most common long-term effect; 22% of patients had worsening of pituitary function. One patient developed unilateral quadrantopia without tumour progression. CONCLUSION SCRT as a high-precision technique of localized irradiation achieves tumour and hormone control of pituitary adenomas comparable with previously published data on the efficacy of conventional radiotherapy. Despite the potential advantage of reducing the volume of normal brain irradiated, the theoretical benefit over conventional radiotherapy in terms of the reduction in long-term morbidity has not yet been demonstrated and requires longer follow-up. Potential effect on long-term cognitive function has not been tested.
Collapse
Affiliation(s)
- G Minniti
- Neuro-Oncology Unit, The Institute of Cancer Research and the Royal Marsden NHS Foundation Trust, Downs Road, Sutton, Surrey SM2 5PT, UK
| | | | | | | | | |
Collapse
|
5
|
Brada M, Ashley S, Dowe A, Gonsalves A, Huchet A, Pesce G, Reni M, Saran F, Wharram B, Wilkins M, Wilkins P. Neoadjuvant phase II multicentre study of new agents in patients with malignant glioma after minimal surgery. Report of a cohort of 187 patients treated with temozolomide. Ann Oncol 2005; 16:942-9. [PMID: 15870090 DOI: 10.1093/annonc/mdi183] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND The aim of this study was to assess the efficacy of new agents in patients with malignant glioma in a neoadjuvant setting not confounded by surgery. The first study of neoadjuvant temozolomide aimed to provide a benchmark for future evaluation of new treatments. PATIENTS AND METHODS This was a multicentre phase II study of chemotherapy in patients with histologically verified glioblastoma multiforme (GBM) and anaplastic astrocytoma (AA) who had undergone biopsy alone. Patients were planned to receive two cycles of temozolomide at 200 mg/m(2) orally daily for 5 days at a 28-day interval prior to radiotherapy. Response was assessed by two central observers on pre- and post-chemotherapy enhanced scans using bi-dimensional criteria and as progression-free survival (PFS) at the time of second assessment prior to radiotherapy. Withdrawal from the study due to worsening clinical condition was, in the absence of second imaging, assessed as progressive disease. Survival and quality of life (QOL) were secondary endpoints. RESULTS Between August 1999 and June 2002, 188 patients from 15 UK and two Italian centres were entered into the study and 187 were analysed. Overall, 162 patients were assessable for response; seven had partial and 25 had minimal response. The objective response rate was 20% [95% confidence interval (CI) 14-26%] and PFS prior to commencing radiotherapy was 64% (95% CI 57-72%). The median survival was 10 months, and 1-year survival 41%. The median survival of responders was 16 months compared to 3 months in patients with progressive disease (P <0.001 on multivariate analysis). CONCLUSION The phase II study design of primary chemotherapy in patients with malignant glioma following biopsy alone is feasible and provides as objective a method of assessment of efficacy as is currently available. The baseline data on temozolomide provide a benchmark for assessment of efficacy of other agents and combinations.
Collapse
Affiliation(s)
- M Brada
- Academic Unit of Radiotherapy and Oncology, The Institute of Cancer Research, London.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
6
|
Minniti G, Traish D, Ashley S, Gonsalves A, Brada M. Risk of second brain tumor after conservative surgery and radiotherapy for pituitary adenoma: update after an additional 10 years. J Clin Endocrinol Metab 2005; 90:800-4. [PMID: 15562021 DOI: 10.1210/jc.2004-1152] [Citation(s) in RCA: 249] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
We assessed the risk of second brain tumors in a cohort of patients with pituitary adenoma treated with conservative surgery and external beam radiotherapy. Four hundred and twenty-six patients (United Kingdom residents) with pituitary adenomas received radiotherapy at the Royal Marsden Hospital (RMH) between 1962 and 1994. They were followed up for 5749 person-years. The cumulative incidence of second intracranial tumors and systemic malignancy was compared with population incidence rates through the Thames Cancer Registry and the National Health Service Central Register (previously OPCS) to record death and the potential causes. Eleven patients developed a second brain tumor, including five meningiomas, four high grade astrocytomas, one meningeal sarcoma, and one primitive neuroectodermal tumor. The cumulative risk of second brain tumors was 2.0% [95% confidence interval (CI), 0.9-4.4%] at 10 yr and 2.4% (95% CI, 1.2-5.0%) at 20 yr, measured from the date of radiotherapy. The relative risk of second brain tumor compared with the incidence in the normal population was 10.5 (95% CI, 4.3-16.7). The relative risk was 7.0 for neuroepithelial and 24.3 for meningeal tumors. The relative risks were 24.2 (95% CI, 4.8-43.5), 2.9 (95% CI, 0-8.5), and 28.6 (95% CI, 0.6-56.6) during the intervals 5-9, 10-19, and more than 20 yr after radiotherapy (four cases occurred >20 yr after treatment). There was no evidence of excess risk of second systemic malignancy. An additional 10-yr update confirmed our previous report of an increased risk of second brain tumors in patients with pituitary adenoma treated with surgery and radiotherapy. The 2.4% risk at 20 yr remains low and should not preclude the use of radiotherapy as an effective treatment option. However, an increased risk of second brain tumors continues beyond 20 and 30 yr after treatment.
Collapse
Affiliation(s)
- G Minniti
- Neuro-Oncology Unit, Royal Marsden NHS Foundation, Sutton, Surrey SM2 5PT, UK
| | | | | | | | | |
Collapse
|
7
|
Hu J, Sether D, Metzer M, Pérez E, Gonsalves A, Karasev A, Nagai C. PINEAPPLE MEALYBUG WILT ASSOCIATED VIRUS AND MEALYBUG WILT OF PINEAPPLE. ACTA ACUST UNITED AC 2005. [DOI: 10.17660/actahortic.2005.666.21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
8
|
Brada M, Viviers L, Abson C, Hines F, Britton J, Ashley S, Sardell S, Traish D, Gonsalves A, Wilkins P, Westbury C. Phase II study of primary temozolomide chemotherapy in patients with WHO grade II gliomas. Ann Oncol 2003; 14:1715-21. [PMID: 14630674 DOI: 10.1093/annonc/mdg371] [Citation(s) in RCA: 207] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND The aim of this study was to assess the efficacy of temozolomide in patients with World Health Organisation (WHO) grade II gliomas treated with surgery alone using imaging and clinical criteria. PATIENTS AND METHODS Thirty patients with histologically verified WHO grade II gliomas (17 astrocytoma, 11 oligodendroglioma, two mixed oligoastrocytoma) following surgery 2-104 months (median 23 months) after initial diagnosis received temozolomide 200 mg/m(2)/day for 5 days, on a 28-day cycle, for a maximum of 12 cycles or until tumour progression. Median age was 40 years (range 25-68 years). Median follow-up from entry into the study was 3 years [range 23-47 months (for patients alive)]. Objective response was assessed by 3-monthly magnetic resonance imaging and monthly health-related quality of life (HQoL) and clinical assessment. Tumour size was measured as the high signal intensity area on fluid attenuated inversion recovery sequences. Responses were assessed using change in the product of two perpendicular diameters as complete response (CR), partial response (PR), minimal response (MR), stable disease (SD) and progressive disease (PD). RESULTS Twenty-nine of 30 patients entered into the study were evaluable for response. Three patients had a PR, 14 MR, 11 SD and one PD. Twenty-four patients received 12 cycles of chemotherapy. Of 29 evaluable patients, three discontinued after four, five and six cycles and two after 10 cycles. Nine patients progressed (three during chemotherapy-one PD and two initial SD-and six after completion of chemotherapy); five had evidence of transformation. The 3-year progression-free survival was 66%. Five patients died; the actuarial 3-year survival was 82%. Ninety-six per cent of patients with impaired HQoL had improvement in at least one HQoL domain. There was improvement in 115 of the 207 domains (56%). Fifteen of 28 patients (54%) with epilepsy had reduction in seizure frequency, of whom six became seizure free. Six patients had transient grade III/IV haematological toxicity (11 episodes; 3.5%). CONCLUSIONS Temozolomide has single-agent activity in patients with WHO grade II cerebral glioma, with modest improvement in quality of life and improvement in epilepsy control. On present evidence, temozolomide cannot be considered as primary therapy without formal comparison with other treatment modalities.
Collapse
Affiliation(s)
- M Brada
- Neuro-Oncology Unit, The Royal Marsden NHS Trust, and Academic Unit of Radiotherapy and Oncology, The Institute of Cancer Research, Sutton, Surrey, UK.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Matos V, Marques AM, Oliveira H, Ramos D, Lopes P, Camacho M, Gonsalves A. [Adjuvant therapy with a glycoprotein IIb-IIa inhibitor (abciximab) in coronary angioplasties with a high thrombotic risk]. Rev Port Cardiol 1998; 17:1001-5. [PMID: 9973861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023] Open
Abstract
INTRODUCTION We retrospectively studied our experience with adjunctive therapy with glycoprotein IIb-IIIa inhibitor (abciximab) on patients with a high risk of thrombotic complications during coronary angioplasty (PTCA). PATIENTS AND METHODS From September 1996 to November 1997, we performed PTCA in 210 patients, and abciximab was given to 38 (18%) of them. The interventions were urgent (primary PTCA in acute myocardial infarction) in 55% of the cases. The mean age of patients was 68.6 +/- 12 years and 71% were male. The reasons for coronary intervention were: acute myocardial infarction in 21 patients (55.3%), unstable angina in 9 (23.7%) and stable angina in 8 (21%). Coronary stents were implanted in 13 patients (34%) and an intra aortic balloon pump was used in 4 (11%). The reasons for using abciximab were: thrombus containing lesion: 22 (57.9%); other type B2/C lesion characteristics: 6 (15.9%); acute closure post balloon PTCA: 9 (23.7%), sub-acute stent thrombosis: 1 (2.6%). Oral acetilsalicilic acid and intravenous heparin were given to all patients at the beginning of the intervention. The mean APTT was 124 +/- 32 seconds at the end of the procedure. RESULTS The arterial sheaths (8 French) were removed six hours after procedure, according to the normalisation of APTT values. Angiographic success in this group of patients was 100%. One patient died during hospitalisation due to left ventricular failure. There was no need for repeated angioplasty or coronary bypass grafting during hospital stay. The main complications related to the use of abciximab were: bleeding (requiring transfusion) in four patients 10.5%); severe thrombocytopenia (< 50,000 platelets/mm3): 1 (2.6%): cardiac tamponade (requiring pericardiocentesis): 1 (2.6%) and pseudo-aneurysm of femoral artery (requiring vascular surgery): 1 (2.6%). CONCLUSIONS The use of abciximab as adjunctive therapy in this small group of patients undergoing coronary interventions with high risk of thrombotic complications is associated with high procedural success, but at the expense of high rates of bleeding complications. Therefore, special care must be applied during and after the procedure to enhance the safety of the patients treated with this drug.
Collapse
Affiliation(s)
- V Matos
- Laboratório de Hemodinâmica, Centro Hospitalar de Coimbra
| | | | | | | | | | | | | |
Collapse
|
10
|
Xu W, Nikolov A, Wasan DT, Gonsalves A, Borwankar RP. Particle Structure and Stability of Colloidal Dispersions as Probed by the Kossel Diffraction Technique. J Colloid Interface Sci 1997; 191:471-81. [PMID: 9268531 DOI: 10.1006/jcis.1997.4977] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A nondestructive Kossel diffraction technique based on the principle of back-light scattering was used to characterize the structure formation which results from the interparticle interactions in colloidal dispersions. Static structure factors, radial distribution functions, and average pair potentials, which characterize the particle packing structures in model systems of hydroxylate latex dispersions, were obtained. The effects of particle concentration and polydispersity on particle structuring and dispersion stability were also studied. Computer simulations based on the Ornstein-Zernike method were compared with the experimental results. Good quantitative agreement was observed.
Collapse
Affiliation(s)
- W Xu
- Chemical Engineering Department, Illinois Institute of Technology, Chicago, Illinois, 60616
| | | | | | | | | |
Collapse
|
11
|
Matos V, Pereira J, Oliveira H, Marques AM, Santos JM, Gonsalves A. [Hemodynamic evaluation in patients with chronic respiratory failure]. Rev Port Cardiol 1997; 16:217-9. [PMID: 9138473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Affiliation(s)
- V Matos
- Serviço de Cardiologia, Centro Hospitalar de Coimbra
| | | | | | | | | | | |
Collapse
|
12
|
Koczo K, Nikolov A, Wasan D, Borwankar R, Gonsalves A. Layering of Sodium Caseinate Submicelles in Thin Liquid Films— A New Stability Mechanism for Food Dispersions. J Colloid Interface Sci 1996. [DOI: 10.1006/jcis.1996.0167] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
13
|
Nascimento J, Lemos C, Marques AM, Antunes MJ, Gonsalves A. [Traumatic aortic valve insufficiency]. Rev Port Cardiol 1996; 15:147-52, 101. [PMID: 8645478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The traumatic aortic valvular insufficiency (TAVI), through less frequent after a non-penetrating thoracic traumatism, is a serious entity with a very reserved prognosis. So it must be suspected in every patients with signs or symptoms of de novo heart failure post-traumatism. The transthoracic echocardiography and eventually transesophageal echocardiography have a fundamental role in the confirmation of the diagnosis. The clinical picture of traumatic aortic regurgitation is quickly evolutionary and the non efficacy of medical therapy has placed the valvular substitution surgery as the best succeeded treatment. With the advent of the aortic valve repairing surgery some TAVI cases has been submitted to this procedure. Nevertheless, the development of residual aortic regurgitation in these situations, usually requiring later valvular replacement surgery, make the aortic valvuloplasty a controversial surgical technique. The AA describe a recent clinical case of aortic regurgitation after a non-penetrant thoracic traumatism, discussing the aspects connected with physiopathology, diagnosis and therapy. The singularity of this case was based on the fact that the initial clinical diagnosis had been prejudiced by the context of a polytraumatism and there had been a time free of symptoms between the traumatism and the beginning of the symptomatology of left ventricular failure. Even though the identification of the problem allowed an intensive treatment of this serious situation that ended with the replacement of the aortic valve by mechanical aortic prosthesis, with the patient's total recovery.
Collapse
Affiliation(s)
- J Nascimento
- Serviço de Cardiologia, Hospital Geral, Centro Hospitalar de Coimbra
| | | | | | | | | |
Collapse
|
14
|
Teixeira A, Cachulo MC, Miranda O, de Sá AM, Zamith A, Fong FP, Gonsalves A. [Rhabdomyosarcoma mimicking left atrial myxoma. Report of a clinical case]. Rev Port Cardiol 1995; 14:325-7. [PMID: 7612281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Affiliation(s)
- A Teixeira
- Servico de Cardiologia, Centro Hospitalar de Coimbra CHC
| | | | | | | | | | | | | |
Collapse
|
15
|
Matos V, Roberto H, Leal M, Marques AM, Camacho M, de Moura Z, Fong FP, Gonsalves A. [Pacemaker implantation in a patient with persistent left superior vena cava and atresia of the right superior vena cava]. Rev Port Cardiol 1994; 13:853-6, 809. [PMID: 7848656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Persistent left superior vena cava with absence or atresia of right superior vena cava is a congenital abnormality of systemic venous return to the heart which may complicate the insertion of a pacemaker electrode. We present a case report of a patient with conduction system disturbances in whom this abnormality was diagnosed during pacemaker implantation, with the possibility of using a transvenous electrode without active fixation system.
Collapse
Affiliation(s)
- V Matos
- Servico de Cardiologia, Centro Hospitalar de Coimbra
| | | | | | | | | | | | | | | |
Collapse
|
16
|
de Lemos CG, Marques AM, Cachulo MC, Gonsalves A. [Primary tricuspid valve insufficiency. Report of 2 clinical cases]. Rev Port Cardiol 1993; 12:947-53, 901. [PMID: 8305247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Two case reports of primary tricuspid regurgitation are presented which diagnoses were made in mean adult life after a long period of few symptoms. The clinical outcome of the two cases was uneven in the sense that only one of them could be corrected with single surgical procedures. Despite relatively rare, this pathology could probably be turned more frequent with a complete and systematic echocardiographic approach. In connection with the reported cases, a review is made of the main etiologies and of some published reports.
Collapse
Affiliation(s)
- C G de Lemos
- Serviço de Cardiologia do Centro Hospitalar de Coimbra
| | | | | | | |
Collapse
|
17
|
|
18
|
Marques AM, Lemos C, Oliveira H, Gonsalves A, Ferrão U. [Myocardial infarct in a young man with normal coronary vessels: apropos of a clinical case treated with streptokinase]. Rev Port Cardiol 1991; 10:673-7. [PMID: 1747258] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The authors report a case of a 31 year old young man who suffered acute myocardial infarction and was subjected to early treatment with streptokinase. The immediate follow-up showed a complete recanalization of the infarct-related vessel, without any identifiable obstructive lesion on coronary arteriography. Related to this angiographic finding, common in myocardial infarction in the young adult, the authors debate the implicated mechanisms, focusing essentially in the relation endothelium-platelets-vasomotricity. The issue of cigarette smoking as a risk factor and its possible pathogenic implication, even in the absence of atherosclerotic plaque, is also approached.
Collapse
Affiliation(s)
- A M Marques
- Serviço de Cardiologia, Centro Hospitalar de Coimbra
| | | | | | | | | |
Collapse
|
19
|
Bevan JA, Buga GM, Florence VM, Gonsalves A, Snowden A. Distribution of choline acetyltransferase in cerebral and extracerebral cranial arteries of the cat. Its relationship to neurogenic atropine-sensitive dilation. Circ Res 1982; 50:470-6. [PMID: 7067056 DOI: 10.1161/01.res.50.4.470] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Choline-acetyltransferase (ChAT) activity was surveyed in segments of cranial arteries--both cerebral and extracerebral--from the cat. High levels were found in pial arteries, both cerebral and cerebellar, and in the arteries to salivary glands, tongue, and nose. Intermediate levels were found in the external and internal maxillary arteries and many of their branches. Enzyme levels in the arteries supplying the head--common carotid, vertebral, and in several systemic arteries and veins and also the lingual vein--were probably not significant. Only those vessels that have higher ChAT contents show capacity for neurogenic vasodilation. The dilation of segments of a number of these arteries, the basilar, middle cerebral, lingual, and internal maxillary, is reduced significantly by atropine (5 X 10(-7) M). ChAT activity did not correlate with vessel norepinephrine content. The data may be interpreted as defining a functional vasodilator system to the head encompassing both cerebral and extracerebral arteries that depends in part on a functional cholinergic link involving a muscarinic receptor. It is separate from the adrenergic outflow. The tissues supplied by vasculature receiving this type of innervation are of ectodermal origin.
Collapse
|
20
|
|