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Biomedical subjects

R M Cavanaugh

Publications and source records attributed to R M Cavanaugh.

6 recordsLinked to original sources
PubMed1991

Developmental changes in multifrequency tympanograms.

The normal maturational course of tympanometric shape, static aural acoustic admittance and ear canal wall characteristics were investigated in healthy infants, who were followed at various time intervals in the first 4 months of life. Susceptance and conductance tympanograms were recorded from both ears of each subject at four probe frequencies or more. In addition, quantitative pneumatic otoscopy was performed utilizing air pressure changes of the same magnitude as those typically used in tympanometry. Results for the group were an increase in admittance magnitude with increasing age at frequencies above 226 Hz. Admittance phase angle increased with age at all frequencies, indicating a growing contribution of compliant elements in the first 4 months of life. The course of development of input admittance at the tympanic membrane differed among individual infants. Otoscopic findings indicated that external ear canal differences cannot completely account for tympanometric differences between young infants and adults.

Acoustic Impedance Tests↗
PubMed1990

Utilizing the phone appointment for adolescent follow-up.

Fifty young women were given 126 telephone appointments as a supplement to follow-up care in a university hospital adolescent clinic. Eighty (64%) calls were placed on the appropriate day, 71 (89%) of which were within 20 minutes of the assigned time. Patients with one or two clinic visits honored 39 of 52 (75%) of their phone appointments, whereas those with 11 or more visits kept only 8 of 17 (47%). Telephone appointments scheduled directly in the clinic were kept on 66 of 98 (67%) occasions as compared to 14 of 28 (50%) for those made over the phone. Sixty-four of 93 (69%) calls were made when the interval from the time the phone appointments were given to date of appointment was 7 days or less, while 16 of 33 (48%) responded when this period was 8 days or longer. The data document the compliance of adolescent girls with telephone appointments and suggest that this technique may be a useful adjunct for monitoring patients requiring close medical follow-up.

Adolescent↗
PubMed1989

Pediatricians and the pneumatic otoscope: are we playing it by ear?

The amount of positive pressure delivered during pneumatic otoscopy was recorded in 53 healthy pediatric patients. The pressures generated ranged from 338 to 1134 mm H2O. The mean pressure introduced was 748 mm H2O with the bulb and 502 mm H2O through the mouthpiece. The mean intraobserver variation in pressure delivered to each patient was 199 and 125 mm H2O with these two methods of insufflation, respectively. These data document the wide variation in pressures generated with the pneumatic otoscope and suggest that the feasibility of modifying this instrument into a standardized, objective pneumatic system should be explored.

Acoustic Impedance Tests↗
PubMed1986

Developmental regression as an early manifestation of vitamin B12 deficiency.

Loss of previously attained developmental milestones in an infant is often associated with central nervous system tumor, neuromuscular disease, or an inborn metabolic error. An infant with developmental regression and involuntary movements who was found to be vitamin B12 deficient on the basis of unrecognized maternal vitamin B12 deficiency is described. The infant had a dramatic neurologic recovery after receiving vitamin B12. The case and a review of similar cases is presented.

Anemia, Macrocytic↗