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Biomedical subjects

S McNulty

Publications and source records attributed to S McNulty.

40 records · Page 3Linked to original sources
PubMed1987

Carbon dioxide retention associated with a humidifier defect.

A case is presented which describes a patient who developed hypercarbia resulting from a defective humidifier. A Puritan-Bennett Cascade I humidifier was incorporated into a circle system between the inspiratory dome one way valve and the patient. A screw which supports the thermal well to the head of the humidifier was missing, thereby allowing an intermittent leak to develop in the system. The leak was present when the system pressure dropped to ambient level; however, at positive system pressure the leak sealed. This allowed exhaled gases into the inspiratory limb of the circuit unchecked by the inspiratory valve yet when the breathing circuit was occluded at the patient end and submitted to pressures of 20 and 40 cm H2O, no leaks were detected. Intraoperatively, PaCO2 was noted to be as high as 68 mmHg just prior to removing the humidifier from the circuit and corrected to 38 mmHg within 15 minutes of removal of the humidifier.

Adult↗
PubMed1987

Induced hypotension with labetalol for orthognathic surgery.

Induced hypotension is an accepted technique for reducing blood loss in various surgical procedures. This study evaluates the effectiveness of labetalol in producing controlled reduction in mean arterial pressure during orthognathic surgery. The potential advantages of this technique are ease of administration, decreased pulmonary shunting, and absence of tachycardia or rebound hypertension compared to other commonly used agents.

Hemoglobins↗
PubMed1977

Initial experience of percutaneous transhepatic cholangiography using a fine gauge needle.

Percutaneous transhepatic cholangiography using a fine gauge (Chiba) needle was performed 41 times in 40 patients with jaundice or abnormal liver function. Their ages ranged from 3 months to 80 years and the youngest successful cannulation was carried out on a 15 month-old-child. There were 32 cases of ex-rahepatic biliary obstruction, the site being shown in 28 (87.5%) and the nature correctly predicted in 22 (69%). One of two cases in the post obstructive phase and one of two with intrahepatic cholestasis were cannulated and showed bile ducts of normal calibre. Three out of four cases with hepatocellular disease were successfully examined and obstruction excluded by showing normal bile ducts. Delayed films taken up to 2 h later were found valuable, particularly in cases of obstructive jaundice. The technique is easier and less expensive to perform than endoscopic retrograde cholangiography. No major complications occurred suggesting the modified technique is now a safe procedure for investigating jaundice or disordered liver function in both adults and children.

Adolescent↗