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Biomedical subjects

D Rennie

Publications and source records attributed to D Rennie.

At least 127 records · Page 7Linked to original sources
PubMed1976

The incidence, importance, and prophylaxis of acute mountain sickness.

Acute mountain sickness (A.M.S.) and its severe complications, high-altitude pulmonary oedema (H.A.P.O.) and cerebral oedema (C.O.), were studied in 278 unacclimatised hikers at 4243 m altitude at Pheriche in the Himalayas of Nepal. The overall incidence of A.M.S. was 53%, the incidence being increased in the young and in those who flew to 2800 m, climbed fast, and spent fewer nights acclimatising en route. It was unrelated to sex, to previous altitude experience, to the load carried, and to recent respiratory infections. The severity of A.M.S. was inversely related to age (independent of rate of ascent) and the highest altitude attained, and was highly ocrrelated with speed of ascent. There were 7 cases of H.A.P.O. and 5 with the more intractable C.O. and, of these 12, 11 had flown in, 9 had spent only one night at Pheriche, and none were on acetazolamide. 11 required evacuation. Acetazolamide, compared in a double-blind study with a placebo and also compared with no tablets at all, reduced both the incidence and the severity of A.M.S. in those who flew to 2800 m but not in those who hiked up to that altitude. Prevention consists in slow ascent, rapid recognition of warning signs, and prompt descent to avoid progression.

Acetazolamide↗
PubMed1975

Retinal changes in Himalayan climbers.

Changes in the fundus of the eye were studied in 15 members of a mountaineering expedition to Dhaulagiri, Nepal (elevation, 8,167 meters [26,795 ft]). Retinal photographs were taken at sea level and at 5,883 meters (19,300) after each climber had descended from his highest point. Five Nepali Sherpas and an additional American climber who came to the base camp late in the climb were also studied. Vascular engorgement with tortuosity, a 24% increase in arterial diameter, and a 23% increase in venous diameter were observed. Retinal hemorrhages were seen in five American climbers (33%), but in none of the Sherpas. The high incidence is striking, but the cause is unknown. We suggest that the hypoxic vasodilatation makes retinal vessels more vulnerable to sudden rises in intravascular pressure.

Adult↗
PubMedDate not supplied

Life events and the onset of affective disorder. A longitudinal general population study.

This paper examines the relationship between life events (ascertained by the Bedford College method) and the onset of affective disorder (defined according to the RDC scheme) in a longitudinal general population survey of women. Fall-off in the reporting of minor events is examined and discussed. Event rates, proportions of women challenged by events, and measures of the risk of RDC disorder associated with the experience of particular events are reported. The results based upon data from an initial interview were largely consistent with those based upon follow-up data, and underpinned earlier work. For both data sets, major difficulties were associated with illness onset. Severe dependent events showed stronger effects than severe independent events but both categories were rare. New substantive findings arising from short-term general population event research are unlikely.

Adolescent↗
PubMedDate not supplied

Perimenstrual complaints in women complaining of PMS, menorrhagia, and dysmenorrhea: toward a dismantling of the premenstrual syndrome.

Four groups of women were compared in terms of their perimenstrual symptoms, reported menstrual blood loss and period pain, and neuroticism scores: three patient groups were referred to a Gynaecology Outpatient Clinic because of menorrhagia (N = 101), PMS (N = 104), dysmenorrhea (N = 56), and a control group (N = 105). The three patient groups showed considerable overlap in a number of symptoms. This has led us to postulate three factors contributing to perimenstrual complaints: a) a 'timing factor' linked to the ovarian cycle; b) a 'menstruation factor,' associated with the buildup of the endometrium and its shedding; and c) a 'vulnerability factor,' one aspect of which, 'neuroticism,' was measured in this study. Depressive symptoms, which were the most important in leading women to seek help for their PMS, were related to all three factors. Depressive mood changes seemed to be linked to the 'timing factor' but were noticeably worse and more prolonged in women with high neuroticism, heavy bleeding, or severe pain. One premenstrual symptom, food craving, was of considerable interest. This was weakly related to neuroticism, not apparently affected by the 'menstruation factor' and differed in severity between those in the PMS group and the other three groups. It is potentially relevant that both carbohydrate craving and depression are linked to serotonergic changes in the brain, which may prove to be particularly marked in the late luteal phase.

Adolescent↗
PubMedDate not supplied

Vulnerability to perimenstrual mood change: the relevance of a past history of depressive disorder.

A past history of depressive illness, defined in terms of treatment by antidepressants, was found to be more common in women seeking help for premenstrual syndrome (PMS) (31.3%; N = 83) than in women complaining of menorrhagia (8.9%; N = 90) or controls (5.8%; N = 104) with dysmenorrhea sufferers (22%; N = '50) reporting intermediate rates. Such a history in the clinical groups was associated with a tendency for premenstrual depression to be relatively prolonged (i.e., persisting through the menstrual phase and sometimes into the postmenstrual week) and with more severe depressive symptoms during the premenstrual, menstrual, and to a lesser extent, postmenstrual phases of the cycle. This, association was not evident for reported heaviness of menstrual bleeding and only weakly evident for severity of pain during the menstrual phase. Women with a depressive history gave higher neuroticism scores. A history of depression, as defined, seems to increase the vulnerability of women to depressive perimenstrual mood change in terms of both duration and severity. This effect on duration may hitherto have served to obscure the relationship between history of depression and premenstrual syndrome.

Adult↗
PubMedDate not supplied

Perimenstrual depression: its relationship to pain, bleeding, and previous history of depression.

Daily ratings of depression, pain, and menstrual blood loss, as well as past history of treated depression, were analyzed in 210 women attending a Premenstrual Syndrome Clinic. Severity and duration of perimenstrual depression was strongly associated with the severity of premenstrual and menstrual pain, raising the possibility of a causal relationship. It is not yet clear whether the occurrence of depression alters a woman's perception of pain, pain aggravates a tendency to perimenstrual depression, or some common factor aggravates both. A relationship between depression and subjective ratings of blood loss was also observed but was less marked than the relationship with pain. Both relationships had been reported in an earlier study using retrospective ratings. A relationship between past history of treated depression and severity and timing of current perimenstrual depression, observed previously, was not found in this study. This discrepancy was not due to differences between retrospective and prospective methods of assessment, but may have partly resulted from differences in the reporting of premenstrual pain in the two studies. Further studies of this association should control for the confounding effect of pain.

Adult↗