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Biomedical subjects

R Childers

Publications and source records attributed to R Childers.

9 recordsLinked to original sources
PubMed1992

ST segment alternans during coronary angioplasty.

Four patients with severe proximal or mid-LAD stenosis were noted to have ST alternans during balloon angioplasty. Neither mechanical alternans nor increased ventricular ectopy were noted. In contrast to prior descriptions in animals or patients with variant angina, ST alternans did not occur following a premature ventricular contraction. Frequent use of calcium channel blockers during PTCA may interfere with the mechanism leading to electrical alternans and its consequences as seen in animal studies, accounting for the low frequency with which this phenomenon is noted during PTCA.

Adult↗
PubMed1978

Time-related changes in the Q-T interval in acute myocardial infarction: possible relation to local hypocalcemia.

In 63 patients with either acute transmural or nontransmural myocardial infarction, the Q-T interval was prolonged beyond normal limits on at least 1 of the 5 days after infarction in 27 patients (8 with transmural and 19 with nontransmural infarction). The time-related changes in the corrected Q-T (Q-Tc) interval were defined for the entire sample and showed significant expansion, maximal on day 2, from a preinfarction control value. By day 5, the Q-Tc interval was no longer significantly prolonged and was not expanded beyond normal limits in any patient. Various possible causes of Q-T prolongation in myocardial infarction are local hypothermia, local conduction delay, neurogenic effect and local hypocalcemia. Collateral evidence suggests that the letter may contribute significantly to prolongation.

Action Potentials↗
PubMed1978

Alternation of atrial cycle length in supraventricular tachycardia.

Nine cases of alternation of the atrial cycles during supraventricular tachycardia are presented, three of which were manifestly due to digitalis toxicity. They presented the following features: absence of 1/1 conduction, upright P waves in Lead II, atrial rates of 156-218. When alternation disappeared, the atrium adopted the longest of the previously inscribed cycles. A ventriculophasic cause was excluded. The possible mechanisms are discussed in terms of the known functional anatomy of the various forms of SVT.

Adult↗
PubMedDate not supplied

Arthrodesis of the first metatarsophalangeal joint: a review of the literature and long-term retrospective analysis.

A retrospective analysis of arthrodesis of the first metatarsophalangeal joint was done to determine the procedure's long-term subjective and objective results. The authors reviewed the long-term results of arthrodesis in 25 patients with 32 operated feet. The average age was 54.8 years (range 22 to 72 years), and the average length of follow-up was 31.9 months (range 12 to 84 months). The patients were questioned regarding pain, activity, cosmesis, and willingness to have the operation performed again. The subjective results were good or excellent in 26 feet (81% success rate). The primary postoperative complaints were pain in the interphalangeal joint (four feet), and a callosity or pain under the first metatarsal head (four feet). Radiographic examination revealed that the procedure provided a good reduction of the hallux valgus angle (preoperative average 33.7 degrees; postoperative average 17.4 degrees) and intermetatarsal angle (preoperative average 16.2 degrees; postoperative average 12.0 degrees). The authors believe that this procedure is a reliable, effective treatment whenever stability is required at the first metatarsophalangeal joint.

Adult↗