Search PubMed⌕ Search

Biomedical subjects

N P Smyth

Publications and source records attributed to N P Smyth.

At least 19 recordsLinked to original sources
PubMed1993

North American Society of Pacing and Electrophysiology policy statement. The NASPE/BPEG defibrillator code.

A new generic code, patterned after and compatible with the NASPE/BPEG Generic Pacemaker Code (NBG Code) was adopted by the NASPE Board of Trustees on January 23, 1993. It was developed by the NASPE Mode Code Committee, including members of the North American Society of Pacing and Electrophysiology (NASPE) and the British Pacing and Electrophysiology Group (BPEG). It is abbreviated as the NBD (for NASPE/BPEG Defibrillator) Code. It is intended for describing the capabilities and operation of implanted cardioverter defibrillators (ICDs) in conversation, record keeping, and device labeling, and incorporates four positions designating: (1) shock location; (2) antitachycardia pacing location; (3) means of tachycardia detection; and (4) antibradycardia pacing location. An additional Short Form, intended only for use in conversation, was defined as a concise means of distinguishing devices capable of shock alone, shock plus antibradycardia pacing, and shock plus antitachycardia and antibradycardia pacing.

Defibrillators, Implantable↗
PubMed1987

The NASPE/BPEG generic pacemaker code for antibradyarrhythmia and adaptive-rate pacing and antitachyarrhythmia devices.

A new generic pacemaker code, derived from and compatible with the Revised ICHD Code, was proposed jointly by the North American Society of Pacing and Electrophysiology (NASPE) Mode Code Committee and the British Pacing and Electrophysiology Group (BPEG), and has been adopted by the NASPE Board of Trustees. It is abbreviated as the NBG (for "NASPE/BPEG Generic") Code, and was developed to permit extension of the generic-code concept to pacemakers whose escape rate is continuously controlled by monitoring some physiologic variable, rather than determined by fixed escape intervals measured from stimuli or sensed depolarizations, and to antitachyarrhythmia devices including cardioverters and defibrillators. The NASPE/BPEG Code incorporates an "R" in the fourth position to signify rate modulation (adaptive-rate pacing), and one of four letters in the fifth position to indicate the presence of antitachyarrhythmia-pacing capability or of cardioversion or defibrillation functions.

Bradycardia↗
PubMed1984

The isotopic cardiac pacer: a ten-year experience.

In the past, the battery has been the main cause of pacemaker failure. The isotopic-powered cardiac pacemaker theoretically should provide greater reliability and longevity than pacemakers powered by chemical batteries. We studied 79 isotopic pacemakers in 75 patients for up to 10 years. Four types of Plutonium 238 powered pacemakers were studied. They included 5 VOO, 51 VVI, 14 VVIP, and 9 VVIM pacemakers. A more diverse group of 93 VVI, VVIP and VVIM pacemakers, powered by chemical batteries, were studied as controls. During the course of study the mercury zinc battery has become obsolete. The increased longevity of the lithium battery, at first very promising, has been compromised by the demands firstly of smaller size, and later of more complex circuits. The longevity and reliability of the isotopic pacemakers has been found to be superior to pacemakers powered by chemical batteries. The isotopic fuel cell, because of its greater longevity, may be needed for the increasingly complex circuits required for dual chamber pacemakers, functioning for the control of bradyarrhythmia alone, or combined with tachyarrhythmia control.

Adult↗
PubMed1984

Report of the NASPE Mode Code Committee.

The NASPE Mode Code Committee was formed in response to the growing need for efficient means of describing the function of increasingly complex single- and dual-chamber cardiac pacemakers. After considering numeric, alphabetic, and pictorial codes, the Committee recommended the adoption of two codes: a generic code which is similar to the Revised ICHD Code and is suitable for conversational use, and a specific code, based on one developed by Brownlee and others, that permits more detailed specification of both antibradycardia and antitachycardia functions. The specific code described in this report was adopted by the NASPE Executive Advisory Committee as the NASPE Specific Code in March, 1983. The generic code was not adopted but is described herein for future reference in the light of experience to be gained in the use of the recently published Revised ICHD Code.

Pacemaker, Artificial↗
PubMed1984

Dilation of difficult strictures of the esophagus.

In managing difficult esophageal strictures not amenable to the usual methods of dilation, a technique of fluoroscopic placement of a guide wire followed by controlled gradual dilation of the stricture has been described. The method is fully explained and is easily performed by a team of endoscopists-radiologists. Since this article was submitted, six additional patients have been dilated by the authors. In each, a stent was used to maintain patency of the strictured lumen.

Aged↗
PubMed1983

Combined coronary artery bypass graft and abdominal aortic aneurysmectomy.

Six cases of combined coronary artery bypass graft and abdominal aortic aneurysmectomy were performed in a 1-year period at the Washington Hospital Center. All cases except one were uncomplicated and the average hospital stay for patients with no complications was less than 10 days. We found that there were distinct advantages in combining these two procedures. Although our experience is limited and no definite criteria for combining such procedures have been established, we feel that this approach has potential as the treatment of choice in patients with severe coronary artery disease and abdominal aortic aneurysm.

Journal Article↗
PubMed1983

Optimal resources for implantable cardiac pacemakers. Pacemaker Study Group.

In this document, the 1974 Inter-Society Commission for Heart Disease Resources (ICHD) report, Implantable Cardiac Pacemakers, has been revised and updated to emphasize the increased complexity of present-day pacing, to propose realistic guidelines for various aspects of pacing practivce, and to identify the resources needed for delivery of this important mode of health care. The first section of the report describes the several types of pacemakers currently available, how they function, and how and to what purpose they may be modified through noninvasive programming. Recommendations are given for a modified and updated version of the widely accepted ICHD code for identification of pacing modes. The emphasis of the second section of the report is on physical and personnel resources. Matters considered in some depth include the training and qualification of the various medical, technical, and paramedical specialists involved in an implantation procedure; requirements for, and methods of achieving, short and long-term surveillance of pacemaker patients; and the role of the hospital, the manufacturers, and the FDA in this new era of complex dual-chamber, multiprogrammable pacemakers.

American Heart Association↗
PubMed1983

Optimal resources for implantable cardiac pacemakers.

In this document, the 1974 Inter-Society Commission for Heart Disease Resources (ICHD) report, Implantable Cardiac Pacemakers, has been revised and updated to emphasize the increased complexity of present-day pacing, to propose realistic guidelines for various aspects of pacing practice, and to identify the resources needed for delivery of this important mode of health care. The first section of the report describes the several types of pacemakers currently available, how they function, and how and to what purpose they may be modified through noninvasive programming. Recommendations are given for a modified and updated version of the widely accepted ICHD code for identification of pacing modes. The emphasis of the second section of the report is on physical and personnel resources. Matters considered in some depth include the training and qualification of the various medical, technical, and paramedical specialists involved in an implantation procedure; requirements for, and methods of achieving, short- and long-term surveillance of pacemaker patients; and the role of the hospital, the manufacturers, and the FDA in this new era of complex dual-chamber, multiprogrammable pacemakers.

Arrhythmias, Cardiac↗
PubMed1982

Atrial pacing.

Explore the source record for details and available documents.

Cardiac Pacing, Artificial↗
PubMed1982

A new multiprogrammable isotopic powered cardiac pacemaker.

A new multiprogrammable, isotopic-powered cardiac pacemaker was implanted in six patients as a custom device. Five were initial implants and one was a replacement. The patients were studied for up to two years. In five of the six cases it was found advantageous to change one of the programmable parameters. Multiprogrammability is obviously as important in an isotopic pulse generator as in a lithium unit, if not more so, because of the unit's greater longevity. Further studies are continuing in an FDA approved clinical trial.

Electrocardiography↗
PubMed1981

A programmable pulse generator with high output option.

A new pulse generator, with a programmable high output option, was implanted in fifteen patients and studied for eight to ten months postoperatively. This feature is designed to combat exit block. It was useful in one patient who developed a form of exit block following a silent myocardial infarction. Muscle stimulation was rare, even though the system is unipolar. The high output option seems to be a desirable feature and should probably be available in all multiprogrammable pulse generators.

Aged↗
PubMed1981

A revised code for pacemaker identification. Pacemaker Study Group.

The three-position ICHD code designating pacemaker function has been widely adopted. A revision, expanding the code from three to five positions, incorporates the first three positions as in the earlier version, but includes position IV, programmable functions, and position V, tachyarrhythmia functions. The code indicates how the pacemaker is employed, not necessarily the purpose for which it was designed. For example, a single-chamber inhibited pulse generator with multiprogrammable capabilities which interrupts a tachycardia by a burst of rapid pacing is designated as VVI,MB if placed in the ventricle, and AAI,MB if in the atrium.

Arrhythmias, Cardiac↗
PubMed1980

Preparing an arterial patch graft.

Patch grafts frequently are used following endarterectomy for short-segment arterial disease. On occasion they are used to increase flow through stenotic areas where endarterectomy might be counterproductive. The following article delineates a fairly efficient way of preparing patch grafts in a reproducible manner. The technique involved in preparing, inserting, and suturing the patch graft is described.

Arteries↗