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Biomedical subjects

G Foti

Publications and source records attributed to G Foti.

46 records · Page 3Linked to original sources
PubMed1987

Volume/pressure curve of total respiratory system in paralysed patients: artefacts and correction factors.

The volume/pressure (V/P) curve of the total respiratory system in paralysed patients is drawn assuming that volume changes of the respiratory system (delta V resp) equals volume displacement of the measuring apparatus (delta V syr), usually a supersyringe. However, in 93 VP curves we found that O2 removed from the lung-syringe system during the procedure (proportional to the time) largely exceeds the CO2 added to the lung-syringe system (delta V gas). This results in a net loss of volume from the system (delta V resp less than delta V-syr). Deflation compliance, hysteresis area and ratio are significantly affected by this phenomenon. Inflation compliance is less influenced by delta V gas, partially compensated by the intrapulmonary gas expansion due to the temperature changes. We conclude that the parameters computed on the deflation limb of V/P curve are misleading if proper correction of the volume scale is not introduced.

Adolescent↗
PubMed1983

Diclofenac sodium in ureteral colic: a double-blind comparison trial with placebo.

A randomized prospective double blind study of the analgesic effect of 75 mg intramuscular diclofenac sodium (Voltaren), a potent prostaglandin synthetase inhibitor, versus placebo (saline solution) was carried out in 131 consecutive patients with acute ureteral colic. Diclofenac provided complete relief of pain 25 minutes after the injection in 59% of the cases, while placebo provided relief in 29% (p less than 0.01). Forty patients in the placebo group and seventeen patients in the diclofenac group needed an open injection of 75 mg diclofenac intramuscularly after 25 minutes due to persistent pain. Fifty-four of the fifty-seven patients treated with an open injection of diclofenac achieved complete relief of pain after 30 minutes. There were no side-effects of the treatment.

Adult↗
PubMed1977

A closed-flow water caloric system.

This paper describes a new method and apparatus to induce nystagmus. Flow of fluid into the ear to induce nystagmus is eliminated by utilization of a closed-flow system. A probe adapted for insertion to a standardized depth into the ear, provides a flow-through path for nystagmus-inducing liquid while expanding in response to the pressurized liquid to conform to the contours of the external auditory canal and tympanic membrane. Thermal conductivity through the membrane-like probe material permits heat exchange between the flowing liquid, and the external auditory canal and/or tympanic membrane to induce nystagmus.At this time, the authors can state only that the quality of nystagmus produced is similar to that produced by current conventional methods. In the small number of patients tested, discomfort appeared to be almost negligible. The system appears to be a promising improvement dependent on the establishment of accurate parameters for diagnosis.

Caloric Tests↗
PubMedDate not supplied

Cardiopulmonary bypass through peripheral cannulation with percutaneous decompression of the left heart in a model of severe myocardial failure.

Prolonged closed chest cardiopulmonary bypass for severe total biventricular myocardial dysfunction requires invasive decompression of the left heart. The authors have developed an elongated helical coil that is permanently attached to the distal 8-10 cm of a flow directed Swan-Ganz catheter. When properly positioned, the helical coil kept the pulmonary artery (PA) and the tricuspid valves open, and allowed closed chest retrograde decompression of the left heart. The authors have evaluated the merits of closed chest cardiopulmonary bypass with decompression of the left heart in this manner in four sheep subjected to 30 min of warm global myocardial ischemia, along with induced ventricular fibrillation. All sheep developed severe global myocardial failure, with no left ventricular (LV) ejection. The authors have shown that pulmonary blood flow during cardiopulmonary bypass was reversed from the left heart, across the lungs, and into the right heart. The wedge pressure never exceeded 12 mmHg at any time, attesting to good decompression during periods of total ventricular failure, during partial recovery with some LV ejection, and after good recovery of LV function, followed by weaning from bypass after 44, 67, and 78 h of such support. One sheep could not be weaned from bypass, even after 5 days of CPBP. Lung function in all sheep remained unimpaired throughout, and there was no wound bleeding. The authors conclude that in this model of total myocardial failure, and while on closed chest CPBP, at all times and with all degrees of myocardial dysfunction, excellent LV decompression with the helical coil catheter was attained.

Animals↗
PubMedDate not supplied

[Induced pemphigus and brucellosis].

A case of induced pemphigus occurring in a patient affected with a brucellosis is reported with emphasis on the definitive remission of the pemphigus after antibiotic therapy against brucellosis and in the absence of corticosteroid treatment. Attention is also drawn to a possible autoimmune mechanism of the pemphigus triggered by brucellosis.

Anti-Bacterial Agents↗
PubMedDate not supplied

Long-term closed chest partial and total cardiopulmonary bypass by peripheral cannulation for severe right and/or left ventricular failure, including ventricular fibrillation. The use of a percutaneous spring in the pulmonary artery position to decompress the left heart.

The authors report that total cardiopulmonary bypass (CPBP) for severe heart failure can be safely maintained for several days through peripheral cannulation alone. In two healthy sheep under general anesthesia, the authors cannulated the right external jugular vein and the right subclavian artery. A special spring was attached to a 7F Swan-Ganz catheter and positioned at the level of the pulmonary artery (PA) valve, rendering it partially incompetent. The extracorporeal circuit included a venous reservoir, a roller pump, a membrane lung, and a blood pulsator set at 25 beats/min. Ventricular fibrillation was induced with 110 VAC. Extracorporeal blood flow was raised to 100-120 ml/kg min. Mechanical pulmonary ventilation was changed to 5% CO2 in room air. During bypass, the wedge pressure (WP) averaged 9-13 mmHg, PA pressure 7-13 mmHg, and central venous pressure 1-9 mmHg. After 38 and 48 hr respectively the hearts were defibrillated with DC shock. There was total heart failure with no ejection from right or left. We continued with TCPBP. The right heart recovered after 1 and 3 hr respectively. After 7 and 5 hr, respectively, there was some aortic ejection. By 11 and 4 hr, respectively, the sheep were off bypass and on room air, with return to baseline cardiac function. Throughout the recovery the WP averaged 4-8 mmHg. At autopsy, all hearts were soft and normal in appearance. Histologic examination of the lungs and the heart was unremarkable. The authors conclude that the PA spring readily decompressed the LV. Ventilating lungs with 5% CO2 in air during CPBP sustained excellent lung function.(ABSTRACT TRUNCATED AT 250 WORDS)

Animals↗