The short and long term sequelae of critical care span body systems and the international classification of function and disability (ICF) framework domains. Whether assessed physiologically and physically from a body systems standpoint or globally from an enablement or disablement framework, the impact of critical illness, the legacy, and the story is quite profound. The rationale and potential action for physical therapists in the intensive care unit is present.

Utilizing the ICF framework, I ponder where to best fit the importance of psychological constructs? Psychology, within the ICF, could be classified as a body function. Yet, psychological understanding is usually applied at the level of the whole person spanning thoughts, emotions, behavior, and perceptions. Potentially a personal factor? But, my sense is such factors are not merely peripheral in rehabilitation. How about social issues? Social factors are inherently a part of the environment, but are also deeply personal.

What’s beyond weakness and beyond function?

Conceptualizing the environment of critical care and a critical illness course requires, at the very least, considering the perspectives of patients, families, and caregivers.  I think it’s helpful to reflect back on your first experience in a hospital, your first time stepping into an intensive care unit. Whether as a student or young professional or even for personal reasons, was this a welcoming environment? I’m not so sure many of us, or the patients we treat would describe it as such. Sure, we, as clinicians, may be comfortable now. That comfort results in part from exposure and understanding. Exposure to the environment, logistics, and processes. Understanding of the lines, treatments, and procedures.

Patients and their families may report quite different experiences and understanding (or lack thereof). The ICU environment provides inputs. Ponder the 5 senses and the inputs (or lack of inputs) likely to occur. The environment of the ICU is not exactly routine and definitely not calming. It is quite foreign and unsettling…

What is touching the patient? Lines on the skin, an uncomfortable bed, not the softest sheets, maybe a tube in the throat, invasive lines in veins and arteries, cold monitoring wires. Are they moving? What is that? Perhaps even restraints or mitts. A catheter, maybe even a tube in the rectum. Visual input is varied and vision even obstructed. Bed rails to the right and left. Or is it a cell? Crawling ceiling patterns and equipment all around. Is it day or night? What’s that shape? Did that thing move? Artificial light and dark fluctuate seemingly at random. Perhaps the TV flickers. Beeps and buzzes abound. Are those voices outside? “Mrs. Smith, open your eyes and look at me.” Who the hell is that? Maybe a familiar voice. Poking, prodding. “I’m just going to draw some blood here.” A blood pressure cuff inflates, maybe a bit too tight. There’s no drinking, definitely no eating. A dried mouth. “Mrs. Smith what month is it?” “Beep, beep…beep beep.” “Ding….ding….ding.” Oh, the dryness. Just want some water, water, moisture. Pressure, a slide up. Is the skin tearing? An achey backside, pain in the buttocks. Hot, cold. Light, dark. Quiet, chaos. Confusion. Agitation. Pain.

How could one not be delirious? The environment, from a neurologic lens, is quite profound. Inputs via a range of various modalities encoded by different receptors resulting in action potentials travel along neural pathways and arrive at the brain as potential sensations. Subsequently, these neural inputs are assessed and result in possible perceptions and affects. Conversely, there may be a relative lack of input or sensation (mitts, restraints, social interaction, medication effects). Movement, or lack of movement, is also an input. As humans, a certain amount of movement and position change is normal (although, admittedly individually dependent and varied). Cardiopulmonary, neurologic, vestibular, psychologic, and neuro-musculo-skeletal systems, all systems really, are accustomed to it. These systems respond and adapt to movement at a macro and micro scale. Fortunately, much is known regarding the multi-system, micro, macro, global, and specific effects of decreased activity and input.

Sensory Deprivation and Perceptual Isolation?

…extended or forced sensory deprivation can result in extreme anxiety, hallucinations, bizarre thoughts, and depression. A related phenomenon is perceptual deprivation, also called the ganzfeld effect. In this case a constant uniform stimulus is used instead of attempting to remove the stimuli, this leads to effects which has similarities to sensory deprivation. –Wikipedia

Unfortunately, the environment and process of medically treating critical illness and stabilizing organ systems likely predisposes patients to physical, functional, neurocognitive, and psychological impairments.

Cognition and Psychology

Short term psychological and neurocognitve problems during critical illness may include stress, decreased memory, decreased attention, fluctuating wakefulness, confusion, delirium, anxiety, agitation, delusional memories, and depressed mood. Socially, there is an obvious breakdown of normal roles and support. Social interaction is decreased and varied. Roles and responsibilities become blurred at the individual and social level. Overall control is lost, and for some likely decreases in locus of control and self efficacy. Family roles may shift, or completely reverse.

“I was never told by anyone what to expect.” –ICU Survivor

What happens after ICU and hospital discharge? Anxiety. Depressive Symptoms. Depression. Post Traumatic Stress. Post Traumatic Stress Disorder. Decreased quality of life. Care giver burden and stress. Complicated grief. Inability to return to work. Who? Medical ICU patients, those with acute respiratory distress syndrome (ARDS), severe sepsis, sepsis, surgical ICU patients, and those requiring mechanical ventilation.  Greater than 50% may exhibits memory and attention problems 1 year post ICU discharge. Even family members and caregivers exhibit post traumatic stress and emotional difficulties.

Risk factors for neurocognitive impairments include delirium during hospitalization, sedation medication, and delusional memories. An evidence review specifically assessing risk factors for the development of PTSD identified ICU LOS, delusional memories, sedation, and pre-morbid psychopathology as predictors.

Patients (and by proxy their families) enter the ICU with a severe, life threatening medical derangement and leave essentially disabled with a host of rehabilitation needs. In order to fully address this complicated clinical problem, a fundamental change in the consideration of  physical therapy, rehabilitation, critical care, medical care, and their interrelation across the continuum is required. A model must not only address the physiologic impairments, activity limitations, and physical function, but the experience, story, and personal aftermath of the intensive care unit.

Bio-Psycho-Social

People do not ‘have’ diseases, which are really descriptive mechanisms created by contemporary medicine.

People have stories, and the stories are narratives of their lives, their relationships, and the way they experience an illness. –Arthur Kleinman, MD

An individual’s physiology is pathologic, or diseased. An individual, the person, has an experience. The necessity, and power, of expanding the bio-medical model to include psychological and social domains stems from the recognition that complex individuals, people, are the ones that must suffer and cope with their diagnoses. Further, observations and research illustrate the important influence of such domains in both illness and health. Research across diagnoses and disciplines, as well as the philosophical considerations of treating an individual, support the premise of a model that considers more than abnormal anatomy and physiology.

But, the BIO matters. The physiology matters. And, we need to know it really well. Biology, physiology, diagnoses, medical treatment, medications, treatment mechanisms, pathophysiology, body systems. The bio-psycho-social model does not discount nor disregard the biomedical. It’s not biomedical vs. psycho-social. It’s the integration of psycho-social into the biomedical.

BPS_ICF

Merging the Bio-Psycho-Social and ICF. Click image for article.

Even the ICF model is focused primarily on a disease or health condition and how that biology interacts with function. Environmental and personal factors are peripherally connected in the model. There is no robust way to account for psychological and social constructs and contributions.

The bio-psycho-social model attempts to address patients individually, psychologically, and within the influence of their social lattice while integrating the available biomedical knowledge and population based research.

BPS Model Via The Patient Patient. Click image to view website.

BPS Model Via The Patient Patient. Click image to view website.

As layers are added to the conceptual model general research relating to each domain is applied. Included is applicable literature of how these individual constructs interact and potentially affect one another. But, this knowledge must be applied to the individual patient within the specifics of the current situation and the present moment of each domain. For example, general knowledge of biology, psychology, social, environmental, and cultural factors is fused with applicable clinical research ranging from epidemiology to prognostic studies to clinical interventions which is in turn applied to the individual within the specific contexts (personal, social, environmental) relevant to the patient. It’s complicated, but conceptual buckets build cognitive representations to guide thinking, assessment, and decision making.

BPS_Onion_ModelBPS_Onion

 

I’m no psychologist! And, nor should we strive to be. But, physical therapists should aim to develop knowledge and skills in the multitude of systems, domains, and potential constructs that affect movement, function, and disability. Principles of psychology are thus paramount. As therapists, expertise in the domain of rehabilitation and therapeutic processes including behavior change, basic counseling skills, and motivation are needed.

Psychologically informed practice…

recognizes the necessity of understanding and applying psychological constructs into our practice. It also recognizes that function, symptoms, and disability are inherently personal and psychological.

Most physical therapists probably acknowledge the importance of psychosocial factors, and many would assert that they recognize them as part of their clinical practice. However, as Bishop and Foster have documented, simple identification or knowledge of such factors does not lead to a change in focus or style of patient management. Yet, there is persuasive evidence for the influence of a patient’s beliefs, emotional responses, and pain behavior on response to pain, treatment participation, and outcome. – Chris Main & Steven George

Research now illustrates that treatment interventions affect psychological domains, and conversely, that psychologically targeted interventions can affect function, symptoms, and disability. For example:

What about critical illness? Recently, improving patient care through the prism of psychology: application of Maslow’s hierarchy to sedation, delirium, and early mobility in the intensive care unit has been discussed.

A holistic approach to the critically ill and Maslow’s Hierarchy. Click image for article.

How does therapy fit into this hierarchy? How can we? Can physical therapists interface with the entirety of this spectrum? All interventions exhibit affects across body systems and patient domains. This includes psychology and this hierarchy. Even though our “target” may be at the physiologic, activity, or functional level, interventions result in unintended consequences (positive and/or negative) with regard to belonging, esteem and self actualization. Recognizing these constructs can assist in assessing their impact on function, participation, and coping. Meaningful interventions or care processes constructed based on these models, and the resulting understanding, may prove worthwhile and effective. Summarizing research from a multitude of practice areas and diagnoses suggests:

1. Effects of specific interventions cross body systems and patient domains
2. Exercise and activity interventions may result in positive unintended affects
3. All interventions are “non-specific” as effects cross many systems & domains
4. Exercise affects cognition & psychology
5. Psychology affects function & participation

Can physical therapists target interventions to psychological and social domains and issues? Can psychologically informed physical therapist driven interventions affect psychological and social domains and issues? It’s time to find out.