Acute hemodynamic effects of levothyroxine loading in critically ill hypothyroid patients.

To evaluate the acute cardiovascular effects of high-dose levothyroxine sodium therapy, the hemodynamic findings in eight critically ill hypothyroid patients treated with high-dose levothyroxine were compared with those in two critically ill hypothyroid and nine critically ill euthyroid patients not receiving this therapy. The initial cardiac index was significantly lower in the hypothyroid group; all other hemodynamic values were similar to those of the euthyroid patients. Following levothyroxine loading, the free thyroxine index increased to normal while the free triiodothyronine index was unchanged; all patients had a significant rise in cardiac index but no consistent changes in the other hemodynamic values. Cardiac index correlated positively with heart rate (three patients) and/or stroke volume index (six patients). Increases in stroke volume index correlated with decreases in systemic vascular resistance (five patients), but not with increases in pulmonary artery wedge pressure. No consistent patterns of hemodynamic changes were observed in the untreated hypothyroid or the euthyroid patients.

Comprehensive pharmaceutical services in a medical intensive-care unit.

The clinical and distributive services that have been provided by clinical pharmacists for the past 14 years in the medical intensive care unit (MICU) of a 1600-bed urban teaching hospital are described. The MICU pharmacy staff consists of 4.3 full-time equivalent pharmacists who provide daily 24-hour services. The pharmacists are actively involved in all pharmacological decisions with hands-on control of drug distribution from preparation through delivery and administration. They maintain up-to-date patient medication records and monitoring flow sheets for each patients. The pharmacists identify adverse reactions, formulate contingency plans, and promptly intervene to prevent crises. They provide comprehensive pharmacokinetic services, select drug administration times and routes, and prepare and deliver all medications. All i.v. medications are custom-made to meet the patients' fluid, sodium, or potassium restrictions. The pharmacists set up infusion pumps and select the proper infusion rates for i.v. and intra-arterial drugs. They also recommend and monitor the patients' nutritional support therapy. The program has been well accepted by nurses and physicians; however, only 20% of the inpatient clinical pharmacists desire to work in the MICU. The skills and educational requirements for managing patients in an MICU are discussed. Pharmacists have become an integral part of this MICU by optimal drug therapy, increasing productivity and efficiency, providing prompt and accurate services, and participating in research.

Evaluation of the Antibiotic Removal Device.

A new system called an Antibiotic Removal Device (ARD), used for the removal of residual antibiotics in blood specimens, was studied in 300 patients diagnosed as clinically septic despite antimicrobial therapy. Blood specimens from these patients were processed with and without the ARD into aerobic and anaerobic media. There were 53 patients who had one or more positive blood culture bottles, for a total of 109 positive blood culture bottles. Of these 109 bottles, 33.9% were positive with ARD-processed blood in aerobic media, 24.8% with ARD-processed blood in anaerobic media, 22.9% with conventionally processed blood in aerobic media, and 18.3% with conventionally processed specimens in anaerobic media. After 6 h of incubation, 14 bottles with blood processed by the ARD and 9 bottles processed conventionally were positive; after 24 h, 48 bottles with blood processed by the ARD and 31 bottles processed conventionally were positive. The same organisms were isolated from both ARD- and conventionally processed blood, with four exceptions. The ARD system, when compared with a conventional system of blood specimen processing, significantly increased the detection of bacteremia and decreased the time required for its detection in patients clinically septic despite ongoing antimicrobial therapy.