In-hospital resuscitation has gotten a lot of attention lately. Data analysis shows a significant number of cardiac arrests take place in hospitals—at least as many as, if not more than, in community settings. Evolving continually, resuscitation science is starting to offer best practices specific to hospitalized patients. This article describes six such practices to improve patient care. Of course, other best practices exist, but the ones you’ll read about here are those most often cited in the literature. Some of them may surprise you.
1. Compression is king
When cardiopulmonary resuscitation (CPR) was first introduced, only physicians and nurses could administer it. Today, schoolchildren are taught CPR. Yet the current belief that anyone can perform CPR might lead some to believe no special skill is required and that chest compressions are tangential to more sophisticated interventions, such as drugs and intubation.
Nothing could be further from the truth. All resuscitation outcomes, from initial return of spontaneous circulation (ROSC) through discharge, relate directly to the quality of chest compressions. No other intervention is as important to watch, critique, and continually correct during a code. The longstanding CPR emphasis on airway first, then breathing, and finally circulation (ABC) was turned upside down by the 2010 Emergency Cardiac Care (ECC) guidelines from the American Heart Association (AHA). Circulation now tops the list, followed by airway and breathing (CAB). (See Chest-compression rate and depth by clicking the PDF icon above.)
2. Pay attention to the bed
For a long time, CPR courses have emphasized the need to place the patient flat on a hard surface. Emergency dispatchers encourage callers to pull cardiac arrest victims out of the bed or chair onto the floor to promote good CPR. But dragging patients from their beds or chairs to the floor is highly impractical and probably dangerous for both patients and rescuers.
Unless a patient collapses at home or in a bathroom, hallway, or public area, resuscitation usually is done with the patient lying on a hospital bed or stretcher. This poses unique challenges (not well addressed in CPR classes) related to optimal height of the bed relative to the rescuer’s height, mattress deflation, and use of backboards. Fortunately, good guidance exists on all three.
When you kneel on the floor next to a patient in cardiac arrest, you’re in an ideal position to provide optimal chest compressions. When a patient in a hospital bed or stretcher requires CPR, height of the rescuer and the bed can affect performance of chest compressions. A well-designed study determined that the optimal bed height for chest compressions is the rescuer’s knee height. So a short rescuer may need to use a stool, and when the rescuer providing compressions changes, bed height may need to be adjusted.
The risk of skin breakdown has led to the design and use of bed surfaces with pressure-distributing mattresses. Some of these mattresses are foam; others use air-filled tubes or containers. Many hospital beds incorporate a rapid-deflate mechanism for use in emergencies when chest compressions are required. But regardless of the mattress type, it’s common practice to place a rigid board under the patient’s chest during chest compression.
Yet neither activation of rapid-deflate mechanisms nor use of a backboard under the bed seems to improve chest-compression performance. This is an important and somewhat counterintuitive research finding. If activating a rapid-deflate mechanism or placing a backboard under a patient delays or interrupts chest compressions, it should be considered harmful and postponed until it can be done without interference.
3. Real-time CPR performance feedback
You already may have a sense that CPR performed with the patient on a bed is more difficult and potentially less effective than CPR performed with the patient on the ground. Indeed, this is the case. And because chest compressions are crucial to good outcomes, we should use technology to monitor their effectiveness objectively. If an arterial pressure monitoring line is in place, compression depth can be targeted directly to produce a diastolic pressure above 25 mm Hg,although some clinicians prefer targeting to a mean arterial pressure of at least 60 mm Hg.
If invasive monitoring isn’t in use, feedback devices are helpful. As early as 2004, real-time feedback devices were shown to improve in-hospital CPR. These devices have evolved, and modern feedback devices (commonly integrated with bedside monitor-defibrillators) use accelerometer-based technology to provide real-time feedback during compression delivery. Feedback devices dramatically improve chest-compression depth and rate and significantly shorten CPR interruptions.
However, accelerometer-based feedback devices haven’t been shown to improve survival, which may be tied to their technological limitations. An accelerometer measures movement. When used as a CPR feedback device, it sits between the compressor’s hands and the patient’s chest, measuring downward movement of the rescuer’s hands. When the patient is on a flat, immovable surface (such as a floor or a sidewalk), the rescuer’s hand movements equal the depth of chest compressions. But when the patient is on a mattress or other moveable surface, the accelerometer can’t determine how much of the total distance travelled by the hands represents chest-compression depth and how much represents mattress movement. This is especially a problem in hospitals, where most resuscitations occur with the patient on a bed or stretcher.
Closer analysis shows that accelerometer-based CPR feedback technologies don’t compensate for mattress movement. This is true whether the mattress is made of foam or is inflatable and whether or not a backboard is placed between the patient and mattress surface. Thus, actual compression depth is 35% to 40% less than the depth reported by the accelerometer device. Unwittingly reducing compression depth by these percentages can easily reduce the potential for ROSC and survival to discharge by more than half. (See Triaxial field induction for better feedback by clicking the PDF icon above.)
4. Capnography is mandatory
The ability to measure carbon dioxide (CO2) concentration in exhaled breaths can be a lifesaver in many situations. Continuous end-tidal CO2 (EtCO2) monitoring is a standard of care for patients during anesthesia; the American Heart Association (AHA) recommends it for continuous use throughout a cardiac arrest. During a code, there are three distinct reasons for paying close attention to EtCO2:
- to ensure that the endotracheal tube stays in the trachea
- to assess CPR quality
- to provide an early indicator of ROSC.
During CPR, confirmation that the endotracheal tube remains in place is critical, as tube dislodgment most often occurs during patient movement. Resuscitation (including chest compressions) involves maximal movement and thus considerable opportunity for the airway to become displaced. Capnography alerts the code team to airway dislodgment within seconds.
In developing its 2010 emergency cardiac care guidelines, AHA recognized that CPR feedback devices measure performance, not results. CO2 is the byproduct of the body’s oxygen use to create energy; it reflects not just respirations but cardiac output. An EtCO2 measurement below 10 mm Hg during a code suggests chest compressions aren’t deep or fast enough to maintain cardiac output, the rescuer is tired (that’s why the compressor should be changed every 2 minutes), or excellent CPR isn’t producing even minimal cardiac output. Some evidence suggest failure to achieve EtCO2 above 10 mm Hg within the first 20 minutes of CPR after intubation is never associated with ROSC and could reasonably be used to justify ending resuscitation. Thus, EtCO2 is a valuable tool for assessing patient outcome. Used in conjunction with newer CPR feedback technology, it adds information rescuers need for a complete picture of resuscitative effectiveness. The third benefit of capnography is early detection of ROSC. (See Detecting return of spontaneous circulation by clicking the PDF icon above.)
5. Oxygen can hurt
Hypoxia can cause significant harm. While no evidence shows patient impairment or harm at an oxygen saturation (O2 sat) above 84%, most people experience impaired mental function when O2 sat is below 64% and typically lose consciousness when it falls below 56%. It seems odd, then, that oxygen—the drug we use most often—is implicated in patient harm.
In reality, this isn’t new information. Long ago, intensive-care practitioners recognized that oxygen has the potential for harm. ECC guidelines issued by AHA in 2000 and 2005 recommended administering oxygen only when O2 sat is below 90%. In the 2010 guidelines, oxygen is recommended only when measured O2 sat is less than 94%. The 2010 guidelines also caution providers against overzealous oxygen administration, citing the known dangers of hyperoxia. (See The trouble with oxygen by clicking the PDF icon above.)
6. Data will rule the future
In April 2013, AHA published the first-ever consensus statement on improving survival of in-hospital cardiac arrest, followed in July 2013 by a consensus statement on improving outcomes both inside and outside the hospital. The timing of these consensus statements coincides with increasing awareness of the significant number of in-hospital cardiac arrests—and perhaps a tinge of guilt over having spent so many years focused primarily on cardiac arrest in the community.
Our improved understanding of the incidence of in-hospital cardiac arrests stems from data collected by the Get With The Guidelines® Resuscitation (GWTG-R) database sponsored by the AHA (www.heart.org/quality). Originally launched in 1999 as the National Registry for CPR (NRCPR), the project collects in-hospital resuscitation data from throughout the United States and works to develop evidence-based guidelines for in-hospital CPR. In 2010, the registry became the GWTG-R; currently, it’s collecting data on in-hospital cardiopulmonary arrest (CPA), acute respiratory compromise, medical emergency team or rapid response team calls, and post-cardiac arrest care. More than 700 hospitals now participate; the dataset has amassed more than 250,000 CPA patients and more than 500,000 resuscitation patients overall.
Participation is voluntary and uses a web-based data collection and reporting interface. Participants can run a wide variety of preconfigured and customized reports on their data and benchmark these against all other participants or select categories of participants, such as hospitals within the same state or like-sized hospitals. The analysis tools and benchmarking ability reveal excellent opportunities for improvement. Recent research found that hospitals participating in the GWTG-R database have better outcomes with each year of participation. Learning how the database operates doesn’t seem to bias self-reported resuscitation data. A recent analysis of GWTG-R data found that hospitals with the best survival rates have fewer cardiac arrests than hospitals with lower survival rates—showing that data manipulation isn’t portraying hospitals to appear better at resuscitation.
You might think such a large database also would yield significant findings about in-hospital resuscitations—and it has. Numerous published papers and research studies have used data from NRCPR and GWTG-R. These have enlightened us on the incidence of in-hospital cardiac arrest, causes, and the days and times when arrests are more likely. The importance of data collection, analysis, and reporting was a key component of recently released guidelines for in-hospital cardiac arrest. In fact, the AHA consensus statement called for mandated data collection and reporting of in-hospital cardiac arrest incidence and outcomes as an accreditation benchmark for all facilities. Public reporting of the data also was suggested, with the caveat that a good methodology for risk-adjustment of patients who suffer in-hospital cardiac arrests would be needed for the public to properly compare one hospital to another. In August 2013, GWTG-R researchers developed and published just such a model, suggesting public reporting may be just around the corner.
Survival of in-hospital cardiac arrest depends on many factors. Beyond early recognition, none is more important than the quality of chest compressions. Good tools and data are available to help healthcare providers improve CPR. These include adjusting bed height and surface, feedback and coaching devices, and EtCO2 measurement. Providers should be familiar with equipment limitations and in-hospital challenges to successful resuscitation, including the potential dangers of oxygen. Data collection and analysis are critically important to improving cardiac arrest outcomes and will drive future improvements as we continue to focus on reducing in-hospital cardiac arrest incidence and improving survival.
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Mike McEvoy is a nurse clinician in cardiothoracic surgical intensive care at Albany Medical Center in Albany, New York, where he chairs the resuscitation committee and teaches critical care medicine. He is the EMS coordinator for Saratoga County, New York, and coauthor of the Critical Care Transport textbook and the Informed® Emergency & Critical Care Pocket Guide. His website is www.mikemcevoy.com.