Pacemaker malfunction: fact or artifact?

D K Murdock; J F Moran; M Stafford; L King; H S Loeb; P J Scanlon

Home/Archive/PubMed

PubMed · 3633245

Pacemaker malfunction: fact or artifact?

D K Murdock·J F Moran·M Stafford·L King·H S Loeb·P J Scanlon

View original source ↗Export metadata ↓

Abstract

In summary, the present examples illustrate how pacemaker malfunction can be simulated by the sources of artifact produced or detected by the monitoring equipment. This form of pseudopacemaker malfunction remains a common cause of mistaken diagnosis of pacemaker malfunction. A thorough understanding of the examples outlined above should help distinguish true pacemaker malfunction from pseudopacemaker malfunction produced by artifact.

Explore related subjects

Amplifiers, Electronic Analog-Digital Conversion Diagnostic Errors Electrocardiography Equipment Failure Humans Intensive Care Units Monitoring, Physiologic Pacemaker, Artificial Telemetry Journal Article

Keep this discovery

Explore connections, maps & timelines

BibTeX RIS

D K Murdock, J F Moran, M Stafford, L King, H S Loeb, P J Scanlon. 1986. Pacemaker malfunction: fact or artifact?. https://pubmed.ncbi.nlm.nih.gov/3633245/

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

KEEP EXPLORING

Related citations

PubMed1992

Design and evaluation of shielded gradient coils.

Techniques are described for the design of shielded gradient coils for superconducting MRI systems. These design methods are suited for constructing the most efficient gradient coil that meets a specified homogeneity requirement. Tradeoffs in coil design of efficiency with coil size and gap size are discussed. Residual eddy currents from coils constructed with a finite number of wires are calculated and give guidelines for the construction of efficient, whole-body gradient coils.

Amplifiers, Electronic↗

PubMed1992

A piezoelectric respiratory monitor for in vivo NMR.

This report describes a simple electronic device employing a piezoelectric element which serves as a sensitive detector of motion. The device is useful as a monitor of respiratory motion for nuclear magnetic resonance animal experiments in vivo. It can also provide a trigger pulse for respiratory gating experiments.

Amplifiers, Electronic↗

PubMed1992

Correction for liquid junction potentials in patch clamp experiments.

This chapter describes corrections that have to be applied to measured membrane potentials in patch clamp experiments. Some of them [Eqs. (1)-(3)] are required regardless of the nature of the reference electrode (in the Ringer's solution bath) whenever the pipette-filling solution is different from the bath solution. They represent the liquid junction potentials that are present at the pipette tip before patch formation. In addition, corrections have to be applied when the bath solution is being changed during a measurement (i.e., after seal formation). In that case the following rules apply. (1) The new solution should never get into contact with the bare silver/silver chloride wire of the reference electrode. This requirement is best met by using a salt bridge. (2) The "best" salt bridge is a 3 M KCl bridge with an abrupt KCl-bath fluid boundary at its tip (see above). This bridge does not require any additional potential corrections, but it may lead to KCl poisoning of the bath or become contaminated by solutions used previously. (3) Local solution changes (microperfusion by puffer pipette, U tool or sewer pipe arrangements) as well as recessed KCl bridges require additional corrections, which (together with the simple liquid junction potential correction) are approximately given by Eqs. (6)-(8). It should be stressed that all equations given here represent approximate corrections, since liquid junction potentials are thermodynamically ill-defined. This is particularly relevant for Eqs. (6) and (7) where the sum of two liquid junction potentials appears.

Amplifiers, Electronic↗