Vital Signs

The Unified Modeling Language, or UML, is a standard notation for specifying, visualizing, constructing, and documenting software systems. This post explains common UML diagram types, how a nursing guideline was modeled in UML for decision support, what a scoping review found about visual modeling languages for patient pathways, and how UML connects to HL7 modeling work.

A recovery point objective, or RPO, describes the age of the data that must be recovered from backup for normal operations to resume after a failure. This post explains RPO, how it differs from recovery time objective, what a retrospective study of 204 EHR downtime events found, and what research on ransomware says about the stakes for patient care.

Wi-Fi is wireless networking technology that uses radio waves to provide high-speed network and internet connections, and the term is used for wireless local area network products based on the IEEE 802.11 standards. This post explains how the standard and the trademark relate, what NIST and the HIPAA transmission security standard say about securing wireless networks, and what research shows about wireless coexistence of medical devices and the security exposure of connected equipment.

Web services are a common method that lets web-based applications connect and use one another’s functions over an internet protocol backbone. This post explains the SOAP, WSDL, and XML foundations the HIMSS Dictionary names, how modern REST-style and FHIR APIs relate, what a remote clinical decision support trial and a hospital service-oriented architecture project reported, and the security and reliability questions to ask.

TCP/IP is the set of communication protocols that underlies the internet and most hospital networks: IP delivers packets from source to destination, and TCP provides a reliable, in-order stream between applications. This post explains the roles of each, how the HIPAA Security Rule’s transmission security standard relates, what a zero-trust FHIR study tested against a SYN flood, and why network reliability matters at the bedside.

Warm standby is a redundancy method in which a second, identical system runs in the background and receives regularly mirrored data, so the primary and secondary systems may hold different versions of the data. This post explains how it compares with hot and cold recovery, what recovery time and data loss mean for clinicians, and why HIPAA contingency planning and downtime drills still matter.

Virtualization is the creation of a virtual rather than physical version of something, such as an operating system, a server, a storage device, or network resources. This post explains server and desktop virtualization, why hospitals use them, the security recommendations in NIST SP 800-125, and what a qualitative study found about virtual desktops and tap-on-tap-off logins in an emergency department.

A recovery time objective, or RTO, is the maximum tolerable time a computer system, network, or application can be down after a failure or disaster. This post explains how RTOs are set through business impact analysis, how they differ from recovery point objectives and actual downtime, how the HIPAA contingency plan requirements relate, and what research shows about EHR outages and clinical operations.

Scalability is the ability of a system to maintain the required quality of service as load increases. This post explains vertical and horizontal scaling, cloud elasticity, capacity planning and load testing, common healthcare peak-load scenarios, research that benchmarks scalability, and what slow systems mean for nurses at the bedside.

Middleware is software that sits between applications, translating, routing, and integrating data so systems built on different platforms or by different vendors can work together. This post explains types of middleware in healthcare, from interface engines to device and alarm middleware, why it is essential for interoperability, the risks it introduces, and its impact on nursing workflows.

A disaster recovery plan (DRP) describes how an organization restores its IT systems and data after a disruptive event such as a fire, flood, power failure, or cyberattack. This post explains how a DRP fits within business continuity planning, the business impact analysis, recovery time and recovery point objectives, protected backups, testing, regulatory requirements, and nursing roles.

Service-oriented architecture (SOA) is an approach to building software from reusable, loosely coupled services that communicate over a network through defined interfaces. This post explains SOA concepts, web services such as SOAP and WSDL, how SOA evolved into REST APIs and microservices, examples in healthcare from IHE profiles to FHIR, and governance considerations.

Availability means timely, reliable access to data and information services for authorized users. This post explains availability as part of the confidentiality, integrity, and availability triad, why it is a patient safety issue in healthcare, how redundancy and recovery objectives work, how ransomware attacks availability, and how nurses keep care going when systems go down.

Software as a service (SaaS) is software delivered over the internet and managed by a vendor, typically on a subscription basis. This post explains how SaaS differs from infrastructure and platform services, why healthcare organizations adopt it, the shared responsibility model for security and HIPAA, vendor and concentration risk, and what SaaS means for clinical workflows and nurses.

Blockchain is a technology for maintaining a shared, tamper-evident ledger of transactions across many participants. This post explains how blockchains work, healthcare uses that have been proposed and piloted, why storing protected health information on a blockchain conflicts with privacy rules, and how to evaluate blockchain claims realistically.

The cloud refers to computing services such as servers, storage, and applications delivered over the internet instead of from an organization’s own data center. This post explains NIST’s definition of cloud computing, the service and deployment models, what HIPAA requires of cloud providers, the shared responsibility model, and what cloud systems mean for clinicians.

A workstation on wheels (WOW) is a mobile computer cart that clinicians move between patient rooms so they can document and scan at the point of care. This post explains why WOWs matter for safety and accurate documentation, the practical issues of batteries, cleaning, ergonomics, and security, and what nurses need from them during Go-Live and every shift.

A business continuity plan (BCP) documents how an organization will keep its essential functions running during and after a serious disruption. This post explains how BCPs differ from disaster recovery and incident response plans, what HIPAA and CMS require, how recovery objectives are set, and how downtime procedures keep nurses delivering safe care.

Single sign-on (SSO) lets a user log in once and reach multiple applications without entering credentials again for each one. This post explains how SSO works, why hospitals pair it with badge tap at shared workstations, the security tradeoffs of a single key, and how SSO affects nurses’ time and workflow.

A picture archiving and communication system (PACS) stores, retrieves, displays, and shares medical images such as x-rays, CT scans, MRIs, and ultrasounds. This post explains how PACS works with DICOM, RIS, VNAs, and the EHR, where imaging workflow breaks down, and how it shows up at the bedside.