Transcatheter closure of patent ductus arteriosus in 11 dogs and one cat after incomplete or aborted surgical ligation

ObjectiveTo describe the characteristics and outcomes of transcatheter patent ductus arteriosus (PDA) occlusion after incomplete or aborted surgical ligation in dogs and cats.AnimalsTwelve client-owned animals (11 dogs and one cat).Materials and methodsThis retrospective study describes data from animals with aborted or incomplete surgical PDA ligation that subsequently underwent transcatheter closure using endovascular methods. Patient demographics, reason for incomplete or aborted surgery, complications, and method of transcatheter occlusion were recorded. Data are presented as mean ± standard deviation or median (interquartile range), where appropriate.ResultsFor all cases, median age at surgery was 12.2 months (4.9–15.1 months) and at catheterization was 15.4 months (8.9–21.9 months), with 79 days (29–209 days) between surgical and interventional procedures. Median weight at catheterization was 4.5 kg (2.5–12.6 kg). Reasons for failed surgical ligation included hemorrhage during ductal dissection in seven dogs, residual flow in four dogs, and inability to identify the ductus in one cat. Transcatheter closure was successfully performed using a canine duct occluder in eight dogs, transarterial coil embolization in two dogs, and transvenous coil embolization in one dog and one cat. Metallic hemoclips partially obscured angiographic findings in three cases with prior surgical hemorrhage but did not prevent transcatheter closure. In all cases, ductal flow was successfully attenuated, with no or trace residual shunting on angiography and complete occlusion the following day on echocardiography.ConclusionsWhen surgery is unsuccessful, either owing to hemorrhage or residual flow, transcatheter closure of PDA is feasible, even in small patients.     

红藤苗木施肥量的初步研究*

红藤(Daemonorops margaritae Hance)是我国主要商品藤种之一,目前已在广东、海南和福建等省推广人工栽培。红藤苗木培育周期长,从播种到成苗出圃约需一年时间,而壮苗技术是推广人工栽培的关键。为了研究红藤壮苗培育技术,在取得藤苗光照试验和矿质营养试验结果的基础上,安排了苗木施肥试验,以探求红藤苗木最适施肥量,为合理施肥提供科学依据。     

初植密度、间伐对杉木林分优势高生长过程的影响

初植密度、间伐对杉木林分优势高生长过程的影响＊洪玲霞关键词杉木优势高初植密度间伐立地质量是决定林分生长和收获的主要因素之一，在用材林经营与管理中，立地质量定义为“生长在某一地位上既定树种或林分类型林木的生产潜力”。以往的研究表明：许多树种的材积生产潜...     

白桦胸径和材积生长率相关关系的研究

根据地位指数的大小将白桦林分划分为好、中、差３个类型，通过没类型样地上的解析木资料分析，证明白桦的胸径和材积生长率存在关良好的相关关系。经过优选，建立了不同类型白桦林分的胸径与材积生长率相关模型，并依此编制出白桦一元材积生长率表，为准确预测白桦积生长率提供了理论上的依据。     

半固定沙地樟子松小叶锦鸡儿混交林营造及经营技术研究

在对嫩江沙地樟子松和小叶锦鸡儿人工混交林林分状况和生长指标调查的基础上,采用统计分析方法,探讨了混交林主辅林种间的生长消长关系,结果表明:随着林龄的增长,辅助树种小叶锦鸡儿对主栽树种樟子松的生长发育具有抑制作用,樟子松的生长发育进程减慢,应对小叶锦鸡儿林分进行人工干预,以促进樟子松的生长发育。     

A review of measurement options for multipurpose trees

There is an urgent need to standardize the methods used to assess the growth of multipurpose trees. Most of the standard methods so far described have been developed specifically for use in multilocational trial networks. This paper was prepared for the F/FRED/ICRAF Workshop on MPTS Assessment Methods, held in Thailand in May 1991 to develop internationally-recognised standards for assessment methodology. It critically reviews the methods prescribed by different networks for height and diameter measurement, and for biomass estimation, giving researchers a range of methodological options to consider and re-emphasizing the need, all too often neglected, to define assessment methods clearly and unambiguously.     

Provenance and progeny results for the tropical white pine, Pinus chiapensis, at five and eight years of age

Eleven provenances and 132 open-pollinated families of Pinus chiapensis were established at six locations in Brazil, Colombia, and South Africa and assessed for height, volume, and forking percent at five and eight years of age. Provenance × site and family × site interactions were examined in a subset of three trials with 38 open-pollinated families in common. Average volume production of P. chiapensis in Colombia and South Africa was 25 m³/ha/yr and 12 m³/ha/yr, respectively, at eight years of age. Provenance and family differences for height and volume were significant at the individual test sites at eight years of age. The La Trinidad (Chiapas) source was the most productive. Forking percent ranged from 3% in South Africa to 38% in San Jose, Colombia at eight years. Provenance × site interactions were significant for forking but not for height and volume. Family × site interactions were significant for height and volume but not for forking. Forty-six percent of the interaction variance between height and location was contributed by only six families. Height/diameter ratios for P. chiapensis were 0.29 and 0.39 in Colombia and South Africa, respectively, and significantly different.     

森林生态系统中林分胸径和树高的Granger因果关系研究

滞后阶数为1时,胸径和树高互为Granger原因,这从理论上证明,建立胸径和树高模型是合理的.当滞后阶数为2时,胸径不再是树高的Granger原因,但树高仍是胸径的Granger原因,两者相比,树高的影响更深远.所以在森林培养时,应更加注重树高,以维持树高对胸径的影响.     

福州地区人工杉木林分蓄积量表的研究

本文提出以林分构成因子——林分胸高总断面积及林分平均高，估计林分蓄积量的办法，选取９种方程求解参数，配合了最优林分蓄积量经验方程，制定出《福州地区人工杉木林分蓄积量表》，对完善我省林业数表的种类、形式和内容，进行了初步尝试。