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Biomedical subjects

J D Morrison

Publications and source records attributed to J D Morrison.

At least 55 records · Page 3Linked to original sources
PubMed1983

Adolescent health care in family practice.

This paper describes the 12,414 health care problems of 3,657 adolescent patients visiting 12 Colorado family practices (4 rural, 3 urban, and 5 residency practices) over a one-year period. All 12 practices utilize the Family Medicine Information System, a selectively automated system for storing and analyzing medical, family, and billing data. Age-sex distribution, visiting patterns, and morbidity are described for patients between 13 and 20 years of age. The 25 most frequent adolescent diagnoses account for 74 percent of visits, and 134 diagnoses account for 95 percent of pediatric visits. Significant sex differences and differences among early, middle, and late adolescent age groups are described. All diagnostic categories are explored in detail, and comparisons are made between urban, rural, and residency practices.

Adolescent↗
PubMed1983

Morphogenesis of photoreceptor outer segments in the developing kitten retina.

The sequence of photoreceptor outer segment morphogenesis has been studied in the developing kitten retina by the examination of serial ultrathin sections and stereopairs of semithin sections. After the outer segment arose as an expansion of the outer end of the cilium, lamellae which had vertical or near-vertical orientations were formed over the whole surface of the outer segment. Subsequently, lamellae of horizontal orientation were formed at the base of the outer segment. The latter gave risk to a stack of horizontal lamellae which increased in height, so displacing the vertical lamellae further and further from the base of the outer segment. These vertical lamellae were eventually ingested by the pigment epithelium, resulting in outer segments which contained horizontal lamellae only.

Animals↗
PubMed1982

Pediatric health care in family practice.

This paper describes the 32,926 health care problems of 9,117 pediatric patients visiting 12 Colorado family practices (4 rural, 3 urban, and 5 residency practices) over a one-year period. All 12 practices utilize the Family Medicine Information System (FMIS), a selectively automated system for storing and analyzing medical, family, and billing data. Age-sex distribution, visiting patterns, and morbidity are described for patients under 18 years of age. The 25 most frequent pediatric diagnoses account for 77 percent of visits, and 121 diagnoses account for 94 percent of pediatric visits. All diagnostic categories are explored in detail, and comparisons are made among urban, rural, and residency practices.

Adolescent↗
PubMed1982

Pediatric training in family practice: a core curriculum.

Official residency guidelines for pediatric training of family practice residents focus on the number of months of block time on pediatric rotations and the percentage of pediatric patients in the resident's model practice. These guidelines do not ensure competence in pediatrics. Family practice residencies need a competency-based curriculum derived from actual pediatric experience in family practice. Such a curriculum should define specific knowledge, skills, and attitudes required, define the family physician's role in handling each issue or condition, be used on a daily basis, and form a basis for evaluation of residents and curriculum. This paper describes the development and implementation of such a pediatric core curriculum at the University of Colorado Family Practice Residency.

Clinical Competence↗
PubMed1982

Postnatal development of the area centralis of the kitten retina: an electron microscopic study.

The postnatal development of the area centralis of the kitten retina was followed with the electron microscope. After birth, small but well developed photoreceptor outer segments were observed. Cone pedicles formed triads and bipolar cells formed dyads; so, potentially, cone pathways to the ganglion cell were present at this time. By the start of the second week, rod spherules formed shallow invaginations containing both central and lateral processes and rod bipolar cells formed dyads. Thus, potentially, rod pathways to the ganglion cell were present. By the end of the third week, the area centralis was sufficiently well developed to take advantage of the clearing of the optical media which occurs in postnatal development. Maturity was attained during the fifth week.

Animals↗
PubMed1981

Yersinia and viruses in acute non-specific abdominal pain and appendicitis.

Four out of 24 patients presenting as an emergency with acute non-specific abdominal pain showed serological evidence of infection with Yersinia pseudotuberculosis. Two out of 13 patients presenting with acute appendicitis during the same period also had evidence of Yersinia infection. Viral infection was present in only 1 patient in each group. Since it is rare to find antibodies to yersinia in healthy individuals, it seems likely that yersinia is a cause of some cases of non-specific abdominal pain. Viral infection does not appear to be an important aetiological factor in patients over 12 years of age.

Abdomen, Acute↗
PubMed1981

The effects of age on spatial frequency perception in human subjects.

Visual performance was measured in sixty-six subjects aged from 5 to 94 years. The curve of contrast sensitivity against spatial frequency was obtained for each subject. This curve had a peak contrast sensitivity in the 2-6 c/deg (cycles/degree) range with the fall-offs to either side of the peak described, on a double logarithmic plot, by straight lines. With advancing age, the position of the peak sensitivity remained unchanged but there was an overall decrease in contrast sensitivity. The highest spatial frequency which could be perceived remained constant up to 50 years, thereafter it fell with increasing age. The slope of the low frequency straight line remained unchanged while that of the high frequency straight line fell with increasing age, i.e. the loss of contrast sensitivity was greater for middle range spatial frequencies than for higher spatial frequencies. The possible site of these changes, i.e. the optics of the eye, the retina/brain or higher decision making centres, is discussed.

Adolescent↗
PubMed1980

Central haemodynamic and forearm vascular effects of morphine in patients after open heart surgery.

Central haemodynamic and forearm vascular changes following administration of morphine i.v. were studied in patients 24--30 h after open heart surgery. Right atrial pressure, heart rate, mean arterial pressure, cardiac output and stroke volume were measured before and after morphine 5 and 10 mg per 70 kg in 14 subjects. In a further group of eight subjects, forearm blood flow was measured after morphine 10 mg per 70 kg. Total systemic and forearm vascular resistance were derived from these measurements. In spite of wide individual variations, significant decreases in mean arterial pressure occurred in most of the patients and appeared to be dose related. Significant decreases in mean cardiac index were noted only after morphine 10 mg per 70 kg. Forearm blood flow increased consistently and significantly and there was a corresponding decrease in vascular resistance. The decrease in mean arterial pressure and the change in forearm vascular resistance indicated that vasodilatation was probably the principle cause of the decrease in arterial pressure, whereas the sustained decrease in cardiac output seemed to indicate an effect on venous capacitance. The predominant action of morphine appears to be peripheral, causing a decrease in vascular resistance and, possibly, an increase in venous capacitance.

Cardiac Surgical Procedures↗
PubMed1980

Geriatric preventive health maintenance.

A preventive approach to geriatric health care should include periodic and systematic assessment of the physical, mental and social status of the elderly person. This article is a review of the important aspects of geriatric health maintenance and calls for more American data from the ambulatory-care setting, to aid in further definition of the preventive approach.

Aged↗
PubMed1980

Fatigue as a presenting complaint in family practice.

The medical records of 176 patients with an isolated diagnosis of fatigue (ICHPPC-7901) were reviewed. The study population represented the experience of four family physicians in private practice and of residents and staff of a university family medicine center in Denver, Colorado, over a 12-month period. Variables included for study were age, sex, family structure, diagnostic testing, duration of symptoms, and associated final diagnosis. Women outnumbered men in the study population two to one. Fatigue occurred most frequently in people ages 15 to 34 years. Single people, both men and women, were represented in the study population at a higher rate than family members. Single women tended to have physical diagnoses associated with their fatigue, while women who were members of family units tended to have psychological diagnoses associated. Fatigue lasting longer than four months was more frequently associated with psychological problems, while symptoms less than four months in duration were more frequently associated with physical problems. Physical problems were involved in just over half the cases, with the most common being the prolonged viral syndrome. A discussion with the patient regarding his or her fatigue and its origin was documented in only about half of the cases.

Adolescent↗
PubMed1978

Debrisan: an effective new wound cleanser.

Debrisan (Pharmacia GB), an insoluble hydrophilic powder of polymerised dextran, has recently become available in Britain as a wound cleansing agent. So far it has proved to be an effective, if costly, agent for the initial cleaning of moist varicose ulcers, but once the slough has been removed, it has no advantage over more traditional methods in promoting ulcer healing.

Aged↗