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Biomedical subjects

M N Rashad

Publications and source records attributed to M N Rashad.

30 records · Page 2Linked to original sources
PubMed1975

Dermatoglyphic traits in patients with cardiovascular disorders.

Dermatoglyphic studies were carried out on 800 Japanese subjects. Digital dermal pattern types were classified into true whorls, double loops, ulnar loops, radial loops and arches. Both total and absolute ridge count were recorded. Subjects with hypertension, angina pectoris and myocardial infarction were compared with the remaining group of others who had not yet developed any of these disorders. Individuals with myocardial infarction had a significantly higher frequency of true whorls and a correspondingly lower frequency of ulnar loops than the control group. Total and absolute ridge counts were also significantly higher in myocardial infarction. Individuals with hypertension and angina pectoris were not significantly different in most dermatoglyphic traits from the controls. These observations suggest that antenatal factors may contribute to the etiology of myocardial infarction in man.

Angina Pectoris↗
PubMed1975

Genetic parameters of dermal patterns of ridge counts.

Dermatoglyphic traits including ridge counts and pattern type counts on fingers were studied in 711 families representing six racial groups in Hawaii. Heritability tesimates were derived from regressions of offspring on father, mother and mid-parent values as well as from full-sib correlations. These estimates varied from 0.23 for radial loops to 0.80 for total ridge count. The heritability estimates were lower for ridge counts of single hands or single digits.

Dermatoglyphics↗
PubMed1975

Cognitive abilities: use of family data as a control to assess sex and age differences in two ethnic groups.

Four cognitive factors were extracted from test data obtained on 997 families (3,268 individuals) in Hawaii. Factor loading profiles for the two largest ethnic groups (Caucasians and Japanese) are nearly identical, as are profiles for three different age groups. Age curves are presented for factor scores and for four specific cognitive tests. The younger respondents on the age curves are biological offspring of older respondents represented on the same curves, facilitating an unusual control for between-family variance. When the data were stratified by ethnicity, differential rates of cognitive development were indicated.

Adolescent↗
PubMed1972

Hawaiian moles.

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Abortion, Spontaneous↗
PubMedDate not supplied

The addition of 0.2 mg subarachnoid morphine to hyperbaric bupivacaine for cesarean delivery: a prospective study of 856 cases.

In an effort to determine the incidence of respiratory depression and other side effects of subarachnoid morphine, we conducted the following prospective study in a large number (856) of young female patients undergoing cesarean delivery in one hospital. During the period from July 1987 to January 1989, patients receiving subarachnoid hyperbaric bupivacaine combined with 0.2 mg preservative-free morphine were included. They were continuously monitored for 24 hours using a pulse oximeter. For 24 hours, the vital signs, including respiratory rate every hour, and the side effects, including pruritus, nausea, and vomiting, were recorded. The need for analgesia and the total dose of opioids during the first 24 hours were documented. Our results showed that respiratory depression (SaO2 less than or equal to 85% and/or respiratory rate ten breaths per minute or less) occurred in eight patients, all of whom were markedly obese. Fifty-eight percent of the patients did not require analgesics for 24 hours. In those requiring an added opioid, the dose was (9.1 +/- 0.5 mg morphine, mean +/- SEM). Eighty-five percent of the patients were satisfied with the postoperative analgesia. Six percent were dissatisfied due to the side effects, i.e., pruritus, nausea and/or vomiting. Nine percent were dissatisfied with the pulse oximeter because it caused false alarms and limited their mobility.

Anesthesia, Obstetrical↗
PubMedDate not supplied

Comparative flow rates of saline in commonly used spinal needles including pencil-tip needles.

BACKGROUND AND OBJECTIVES: Certain characteristics of spinal needles that can influence their clinical usefulness were examined, namely, flow rates, internal diameters, and size of orifices of pencil-type needles. METHODS: Flow rates of 0.9% sodium chloride solution were measured in spinal needles with an infusion pressure of 10 mmHg at isothermic and steady-state conditions. In 15 different types, a new needle was used for each experiment, and 6 experiments were performed with each needle type for a total of 90 experiments. The Hagen-Poisseuille Law for laminar flow was used to calculate the internal diameters. RESULTS: The flow rates of needles of the same gauge varied considerably depending on the manufacturer. Compared with 26-gauge ultrathin-wall spinal needle produced by the same manufacturer (Braun, Bethlehem, Pennsylvania), the flow rate through 29-gauge spinal needle was 18% that of the former needle. The flow rate through 27-gauge Quincke Whitacre needle (Becton Dickinson, Rutherford, New Jersey) was not statistically different from that through 26-gauge needle by the same manufacturer. By arbitrarily choosing < or = 2 seconds to be the in vitro desirable period for saline to traverse the needle from one end to the other, all needles with the exception of 29-gauge and standard 26-gauge Quincke Braun needles met this criterion. The length and size of the orifices of Whitacre needles were found to be significantly smaller than those of Sprotte needles (Havel, Cincinnati, Ohio). The orifice of Sprotte needle was longer than the known thickness of the dura while that of the Whitacre needle was smaller. CONCLUSIONS: Needles of the same gauge do not necessarily have the same flow rate. Flow rate correlates well with internal, not external, diameter. By considering < or = 2 seconds to be the desirable time for saline to traverse a spinal needle, all, except two, meet this criterion. The orifice of Whitacre needle has more desirable features than that of Sprottle needle. Anesthesiologists are encouraged to use 27-gauge needles since their flow rate is not slower than that of 26-gauge needles.

Needles↗