Search PubMedSearch

PubMed · 2779295

Data compression applied to dynamic electrocardiography.

Abstract

We have tested some techniques of ECG compression on the BIH/MIT Arrhythmias database. We have applied the following methods: (1) method of differences; (2) compression by prediction; (3) sample skipping methods; with the following kinds of errors: amplitude error, amplitude and delay error, area error. In the first and second method the average code length found after application of the Huffmann encoding has been found to be about 4 bits sample-1. For the third method the final compression ratio varies according to the allowed error; with a limited error threshold, however, we have reached an average compression a little lower than 1:5.

Explore related subjects

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

M Bertinelli, A Catelli, C Combi, F Pinciroli. 1989. Data compression applied to dynamic electrocardiography.. https://doi.org/10.1007/bf02442167

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related citations

Hyperkalemia in outpatients using angiotensin-converting enzyme inhibitors. How much should we worry?

BACKGROUND: Hyperkalemia is a potentially life-threatening complication resulting from the use of angiotensin-converting enzyme (ACE) inhibitors; data to guide the intensity of monitoring for or responding to hyperkalemia in outpatients are limited. METHODS: Case-control methodological procedures were used to identify risk factors for hyperkalemia. Outpatients prescribed ACE inhibitors during 1992 and 1993 at a Veterans Affairs medical center general medicine clinic were identified. Case patients had a potassium level higher than 5.1 mmol/L on the day of clinic visit while using an ACE inhibitor; controls had a potassium level lower than 5.0 mmol/L on the day of clinic visit while using an ACE inhibitor and had no elevated potassium level during the study period. Predictor variables measured included type and dosage of ACE inhibitor; serum chemistries; comorbidities; concurrent drug use; and age. Case patients were followed up for 1 year after the index episode of hyperkalemia. Follow-up variables included changes in therapy with ACE inhibitor, maximum potassium for each change, and mortality. RESULTS: Of 1818 patients using ACE inhibitors, 194 (11%) developed hyperkalemia. Results of laboratory studies indicating a serum urea nitrogen level higher than 6.4 mmol/L (18 mg/dL), creatinine level higher than 136 mumol/L (1.5 mg/dL), congestive heart failure, and long-acting ACE inhibitors were independently associated with hyperkalemia; concurrent use of loop or thiazide diuretic agent was associated with reduced risk. After 1 year of follow-up, 15 (10%) of 146 case patients remaining on a regimen of an ACE inhibitor developed severe hyperkalemia (potassium level > 6.0 mmol/L). A serum urea nitrogen level higher than 8.9 mmol/L (25 mg/dL) and age more than 70 years were independently associated with subsequent severe hyperkalemia. CONCLUSIONS: Mild hyperkalemia is common in medical outpatients using ACE inhibitors, especially in those with renal insufficiency or congestive heart failure. However, once hyperkalemia is identified during the use of ACE inhibitors, subsequent severe hyperkalemia is uncommon in patients younger than 70 years with normal renal function.

Ambulatory Care

ASHP survey of ambulatory care responsibilities of pharmacists in integrated health systems--1997.

The results of a national survey of the ambulatory care functions of pharmacists in integrated health systems, including managed care organizations, are reported. Persons responsible for ambulatory care pharmaceutical services in 392 integrated health systems nationwide were interviewed by telephone and asked about their systems' organizational characteristics, information systems, pharmacist functions, and performance measures. Respondents reported a range of health-system components, including acute care hospitals, home health services, managed care products, and ambulatory care centers. Approximately 27% of respondents reported that their health system had an electronic medical records system, and 23% reported having one for ambulatory patients. Approximately 49% of respondents indicated that their system had an interdisciplinary care team for ambulatory patients that included a pharmacist. Overall, distributive functions consumed the largest portion (45%) of pharmacists' time, followed by clinical (30%) and administrative (21%) activities. The percentages of time spent on the different functions varied by geographic region and type of health system. Tracking adverse drug reactions, monitoring medication compliance, using pharmacoeconomic data for formulary decision-making, conducting medication management programs, and patient counseling were routinely provided as part of ambulatory care pharmaceutical services by 75% or more of health systems. Financial performance and patient satisfaction were the most frequently used performance-evaluation measures. Overall, pharmacists providing ambulatory care services in integrated health systems spent about 45% of their time on distributive, 30% on clinical, and 21% on administrative functions.

Ambulatory Care