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Biomedical subjects

M H Friedman

Publications and source records attributed to M H Friedman.

At least 73 records · Page 4Linked to original sources
PubMed1984

Numerical simulation of aortic bifurcation flows: the effect of flow divider curvature.

Two dimensional steady flow calculations in computational regions obtained from radiographs of human aortic bifurcations correlate well with unsteady measurements of wall shear in flow-through casts of the same vessels. The results suggest that wall slope may be an important factor affecting the variability of shear along the medial walls of this arterial segment. If extremes of shear stress promote atherogenesis, then variations in the curvature of the proximal iliac arteries may affect the susceptibility of these vessels to vascular disease on their medial aspect.

Aorta↗
PubMed1984

Changes in aortic bifurcation geometry during a cardiac cycle.

In vivo radial strain measurements at the rabbit aortic bifurcation were made at different times during the cardiac cycle. At the peak of the pressure pulse, the radial strain at the bifurcation is positive in the plane perpendicular to the bifurcation but negative in the plane of the bifurcation. Thus the cross-sectional geometry at this location distorts from an elliptical shape in diastole toward a more circular shape in systole.

Animals↗
PubMed1984

Comparison of steady and pulsatile flow near the ventral and dorsal walls of casts of human aortic bifurcations.

Steady and pulsatile flows were passed through casts of human aortic bifurcations and, by means of a laser Doppler anemometer, fluid velocities were measured at selected sites near the ventral and dorsal walls. At these sites, in the vicinity of the bifurcation, the influence of secondary flow is significant and therefore an appreciation of the phasic variation of secondary flow patterns is important. Results are presented comparing the flow direction in both steady and pulsatile flow at sites in three casts. The common features of the flow at these sites were the persistence of the flow direction during the accelerating and decelerating phases of the pulsatile cycle, and the consistently smaller angle (measured from the inlet centerline) of the pulsatile flow direction as compared to the angle of the flow direction in steady flow.

Aorta↗
PubMed1984

Joint play movements of the temporomandibular joint: clinical considerations.

During the voluntary mandibular movements produced by various combinations of medial and lateral pterygoid muscle activity, the mandibular condyle is confined to a line roughly parallel to the articular surface of the temporal bone. Techniques using involuntary joint-play movements of the temporomandibular joint (TMJ) can move the condyles downward or mediolaterally. Condylar distraction is accomplished by application of a downward force to the patient's posterior molar and a simultaneous upward force to the patient's chin. Variations, such as addition of a forward component to the distraction, or bilateral distraction (requiring an assistant to stabilize the patient's head), are often used. Lateral condylar movement requires application of a gentle lateral force to the lingual surface of the patient's posterior molar, as an opposite force is applied to the anterior part of the patient's mandible. These joint-play procedures are indicated initially, in TMJ evaluation, or during treatment of TMJ hypomobility. However, these techniques must be used cautiously if the joint is inflamed, as indicated by tenderness to palpation. TMJ evaluation requires gentle downward and lateral movements, while treatment of TMJ hypomobility may require alternation of forceful distraction and gentle lateral movements. Hypomobility due to an anteriorly displaced disc requires a strong distraction to reduce the disc and a removable dental prosthesis to maintain it in its correct position as the posterior ligament retracts. These joint play techniques are valuable in restoring function to the TMJ.

Humans↗
PubMed1983

Therapeutic injection of the temporomandibular joint.

A simplified technique for a therapeutic injection of the temporomandibular joint has been presented. We have emphasized diagnosis of the condition, as well as indications and contraindications. If the injection is used where indicated, the results are quite successful. Since this technique is inherently less demanding than those so far described, it may overcome the reluctance of dentists to inject the TMJ and thereby make certain cases more responsive to treatment.

Humans↗
PubMed1983

Resistance of gram-negative bacilli as related to hospital use of antimicrobial agents.

The development of resistance of gram-negative bacilli, which are common nosocomial pathogens, is an increasing problem. It is generally accepted that this resistance may directly reflect the frequency of use of various antimicrobial agents. Because our institution experienced in 1976 a dramatic change in the pattern of antimicrobial use, primarily a marked decrease in prescribing cephalosporins, we attempted to evaluate retrospectively the effects of this change upon the resistance of gram-negative bacilli that are common nosocomial pathogens. Susceptibilities of Klebsiella and Providencia spp., Pseudomonas aeruginosa, and Serratia marcescens were determined for the years 1975 to 1979. Not unexpectedly, we observed a substantial decrease in cephalosporin resistance. An unexpected finding was a decrease in aminoglycoside resistance, despite increased use of these agents. The possibility that decreased cephalosporin use may lead to decreased aminoglycoside resistance is an intriguing and provocative thesis which can only be speculative at this time but which would seem worthy of additional formal investigation.

Aminoglycosides↗
PubMed1983

Neglected conditions producing preauricular and referred pain.

Various theories regarding temporomandibular joint symptoms are reviewed. Two hundred and forty six patients suffering from head, neck, or facial pain, or masticatory dysfunction were studied. In 108 of these patients, the diagnosis of temporomandibular joint synovitis, lateral pterygoid muscle dysfunction, or tenomyositis of the masseter muscle was made. Examination procedures, diagnosis, frequency of occurrence, and initial treatment of these conditions are described.

Adolescent↗
PubMed1982

Application of orthopedic principles in evaluation of the temporomandibular joint.

Temporomandibular joint dysfunction is often the cause of a variety of symptoms throughout the head and neck. Because such dysfunction plays an integral part in head pain and earache, differential diagnosis should include an evaluation of the temporomandibular joint. Dentists are the primary professionals involved in temporomandibular joint evaluation and treatment, but they are mainly concerned with nonmovable radio-opaque parts. Physical therapists, then, must learn more about this joint so they can assist dentists in restoring function to it. Principles of joint evaluation are presented relative to the temporomandibular joint so physical therapists can apply their expertise in joint and soft tissue management to assist dentists in restoring function to the temporomandibular joint.

Humans↗