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The Role of the Physical Therapist Assistant in Physical Assessment
1. Apply the language of the Guide to Physical Therapist Practice to physical assessment procedures.
2. Identify the common elements of examination, evaluation, and assessment.
3. Describe the role of the physical therapist assistant in the performance of physical assessment based on the physical therapy plan of care.
4. Discuss the role of the physical therapist assistant in data collection.
5. Explain methods of modifying the physical therapy plan of care or actions to be taken in response to physical assessment of the patient.
6. Identify critical elements to include with documentation of physical assessment.
7. Relate physical assessment to goals and outcomes of a physical therapy plan of care.
As any prospective or current student in the field of physical therapy is aware, changes in the profession are emerging rapidly. In an effort to bring physical therapy professionals to the “health care table” for discussion of legislative, regulatory, and reimbursement issues, the leaders of our profession are striving for standardization of terminology and recognition and application of evidence-based practice.4 Needless to say, controversy or at least animated debate occurs among interested parties any time such an in-depth self-scrutiny of a profession takes place. One significant element of this debate in physical therapy revolves around the physical therapist assistant’s (PTA’s) role in the profession, including how the PTA participates in the administration of the physical therapy plan of care, including selected interventions, data collection techniques, and the terminology associated with the PTA’s role. The purpose of this chapter is to summarize available standards and guidelines associated with the PTA’s role in physical therapy treatments and to discuss techniques and implications of selected interventions and their associated data collection techniques to be utilized for the patient with a musculoskeletal condition.
AMERICAN PHYSICAL THERAPY ASSOCIATION GUIDING DOCUMENTS
Guide to Physical Therapist Practice, Second Edition
The Guide to Physical Therapist Practice, second edition (the Guide) is a tool that was developed by the American Physical Therapy Association in part to “…describe physical therapist practice in general; …standardize terminology used in and related to physical therapist practice; …delineate preferred practice patterns that will help physical therapists…promote appropriate utilization of health care services; [and] increase efficiency and reduce unwarranted variation in the provision of services….”4 The stated purpose of the Guide reads, in part, that it is: “…a resource not only for physical therapist clinicians, educators, researchers, and students, but [for] health care policy makers, administrators, managed care providers, third-party payers, and other professionals.”4 According to the Guide, the definition of the PTA is: “A technically educated health care provider who assists the physical therapist in the provision of selected physical therapy interventions.”4 Assessment is defined as “The measurement or quantification of a variable or the placement of a value on something.”4 Further, the Guide states, “Assessment should not be confused with examination or evaluation.”4 Examination involves preliminary gathering of data and performing various screens, tests, and measures to obtain a comprehensive base from which to make decisions about physical therapy needs for each individual patient, including the possibility of referral to another health care provider. Evaluation is the specific process reserved solely for the physical therapist (PT), in which clinical judgments are made from this base of data obtained during the examination.4
Standards of Ethical Conduct for the Physical Therapist Assistant
The Standards of Ethical Conduct for the Physical Therapist Assistant is a tool developed by the American Physical Therapy Association to delineate the ethical obligations of all PTAs.7 There are eight standards of ethical conduct for the PTA and they can be found in the “Membership and Leadership” section on APTA website (www.apta.org).
Professionalism in Physical Therapy: Core Values
The American Physical Therapy Association has also developed a list of values, known as core values, which reflect what one would call a professional in physical therapy. The core values include: accountability, altruism, compassion/caring, excellence, integrity, professional duty, and social responsibility.3 Each core value, along with its corresponding definition as defined by the APTA, can be found in the “Practice” section on the APTA website.
The Clinical Performance Instrument
The Clinical Performance Instrument (CPI), a uniform clinical education grading tool developed by the American Physical Therapy Association,5 includes the following criteria related to the PTA’s role in clinical problem solving and judgments, data collection, and assessment techniques:
“Participates in patient status judgments∗ within the clinical environment based on the plan of care established by the physical therapist.” (criterion #9)
“Obtains accurate information by performing selected data collection† consistent with the plan of care established by the physical therapist.” (criterion #10)
“Discusses the need for modifications to the plan of care established by the physical therapist.” (criterion #11)
A Normative Model of Physical Therapist Assistant Education: Version 2007
A Normative Model of Physical Therapist Assistant Education: Version 20072 (the Model) is a consensus-based document developed by the American Physical Therapy Association. Briefly, the Model was designed to provide a representation of all of the elements that provide the foundation for the development and evaluation of educational programs preparing PTAs.2 According to the Model, PTAs “…implement selected components of patient/client interventions and obtain data related to that intervention; make modifications in selected interventions either to progress the patient/client as directed by the physical therapist or to ensure patient/client safety and comfort.”2
Each performance expectation theme includes educational outcomes, terminal behavioral objectives, and instructional objectives to be achieved in the classroom and clinic.
Frequently, the response to the question about the difference between PTs and PTAs is simply, “PTAs don’t do evaluations.” Considering the elements of judgment and decision making involved with evaluation and from the preceding discussion, does this imply that the PTA does not exercise judgment or make decisions? Of course not. However, the judgments and subsequent decisions of the PTA are made within the context of the existing physical therapy plan of care, established by the supervising PT through the examination and evaluation process. This process occurs on an ongoing basis.23 Without effective data collection and reporting by the PTA, the PT would lack key information on which this data management process relies.23
It may be helpful to consider the functions of data collection and patient management as integral parts of managing a patient’s physical therapy case, which is a dynamic process as illustrated in the APTA’s “Problem-Solving Algorithm Utilized by PTAs in Patient/Client Intervention” (see Figure 1-1).2
INFLAMMATION
What Is Inflammation?
General Contraindications and Precautions with Inflammation
In general, remember that inflammation is a reaction to tissue trauma or injury; the increased inflammatory reactions after exercise or other interventions may indicate that the intervention is too aggressive or contraindicated, resulting in new trauma or injury to healing tissues. Furthermore, responses to interventions between visits must also be assessed; a patient may report signs of increased inflammation up to 48 hours after an injury or intervention, particularly after administration of exercise or manual stretching techniques.19
Acute versus Chronic
Under normal circumstances, signs of acute inflammation persist for 4 to 6 days, assuming the precipitating condition, agent, or event is removed. In the initial 48 hours after tissue injury, the observable signs of inflammation are associated with the normal inflammatory vascular response to trauma.19 An important distinction to make is the definition of acute versus chronic in relation to the actual cause of injury or trauma. It is common for sources to refer to these tissue states in terms of time frames only, with the acute phase lasting 4 to 6 days and the chronic phase lasting 6 months to 1 year.19 A more useful way to consider inflammation incorporates the concept of whether there is real or impending tissue damage present. The significance of this designation relates to the PTA’s role in determining whether, based on the stage of inflammation present, certain interventions may be implemented or are contraindicated.28 If an intervention normally results in an inflammatory reaction, it is contraindicated when the tissue is in an acute inflammatory state that indicates ongoing tissue damage. For example, in the presence of acute inflammation (indicating an active state of injury, tissue damage, or early tissue healing), dynamic resistance exercises are contraindicated.19 However, the PTA also may proceed with interventions included in the plan of care that accelerate the inflammatory process if it has been determined that the original causal agent or condition no longer results in ongoing tissue damage. Contraindications related to specific diagnoses or associated with the application of specific physical agents are discussed elsewhere in this book.
During interventions involving range of motion (ROM) activities, the PTA also may note that the patient reports pain before tissue resistance is felt (before end ROM); this is an indication of acute inflammation.19 Pain reported at the same time end ROM is reached is indicative of a subacute inflammatory state, and pain reported as a stretching sensation at the limit of ROM is a sign of inflammation in the chronic state.19 If the PTA determines that the established plan of care includes interventions that are not appropriate for the apparent stage of inflammation, the PT must be consulted to adjust goals, time frames, or possibly the plan itself to ensure that the treatment does not contribute to a prolonged or abnormal state of inflammation.
TEMPERATURE
Both the degree of temperature elevation and duration of fever are relevant to diagnostic processes when elevated body temperature is evident. During the initial examination and evaluation, any abnormality in temperature, either locally or systemically, should be noted. The PTA’s role is then to note deviations from the examination findings, determine the length of time the fever has been present (through patient interview) and note other possible related signs and symptoms: rash, cough, complaints of sore throat, and so on. Also it should be noted if the patient reports any pattern of temperature changes, because this may have diagnostic implications for the PT or physician. Immediate implications include whether or not exercise or other interventions may be contraindicated and to what extent infection control issues must be addressed. Normal adult body temperature (oral measurement) ranges from 96.8° F to 99.5° F (36° C to 37.5° C).26 Temperature is affected by factors including age, time of day, emotions/stress, exercise, menstrual cycle, pregnancy, external environment, measurement site, and ingestion of warm or cold foods.26 Clinical signs and symptoms of fever vary based on the underlying cause and stage and may include general malaise, headache, increased pulse and respiratory rates, general chills, shivering, piloerection, loss of appetite, pale skin, nausea, irritability, restlessness, constipation, sweating, thirst, coated tongue, decreased urinary output, insomnia, and weakness.26 In the case of the presence of fever, the PTA must gather the related data, document it, and report it to the supervising PT. The data and report should include adequate information to enable the PT to respond appropriately, either in terms of immediate modification to the physical therapy plan of care or consultation with the medical team.
Fever and Exercise
In terms of exercise precautions, discretionary caution should be applied with any patient with a fever, because of stresses on the cardiopulmonary and immune systems and the possible further complications related to dehydration.14 The PTA must be familiar with specific exercise techniques (e.g., aquatic exercise) contraindicated in the presence of diseases transmitted via water or air.
Fever and Lymph Nodes
Another condition that may become readily apparent to the PTA in the course of carrying out elements of the physical therapy plan of care is tenderness or exquisite pain in particular regions of the body. The presence of tender or enlarged lymph nodes is of particular concern to the PTA who is performing soft-tissue interventions on a patient with an elevated body temperature (or otherwise). Figure 2-1 provides a visual reference for the location of lymph nodes. PTAs using hands-on techniques such as soft-tissue massage and manual stretching are incidentally afforded the opportunity during the course of treatment to assess for the presence of unusual conditions in areas of lymph node clusters (e.g., in the neck and axilla). Because these symptoms can signify the presence of potentially serious pathologic conditions, the presence of pain, tenderness or enlargement of lymph nodes are situations in which the PTA must consult with the supervising PT to pursue medical follow-up for definitive diagnosis.14 In addition, certain interventions are considered contraindicated if the patient has an underlying pathology related to changes in the lymph nodes.
REDNESS AND SKIN COLOR CHANGES
Unexpected findings in terms of changes in skin color should be reported to the supervising PT for further evaluation. These changes include rashes or redness that appear as a streak originating from the site of injury. Red streaks may indicate an acute inflammation caused by a bacterial infection (streptococci, staphylococci, or both), resulting in acute inflammation of the lymph vessels.14 Redness along with superficial tenderness and hardness (induration) of the area may be a sign of superficial thrombophlebitis.14 These findings should be reported to the supervising PT because they may be a precursor to more serious conditions. A loss of skin color (paleness or pallor) associated with temperature changes, edema, or pain may be indicative of an occlusion in a blood vessel and warrants immediate medical referral. A commonly used quick assessment technique to rule out the presence of a deep vein thrombosis (DVT) is Homans’ sign, performed by gentle passive stretching of the ankle into full dorsiflexion and assessing for pain in the calf. Some clinicians also incorporate a gentle squeezing of calf musculature during the passive dorsiflexion to assess for tenderness. Other structures that are stretched during this test include the calf muscles and the Achilles tendon; thus a positive Homans’ sign may be noted in error if a patient has tightness or inflammation of these structures. Although Homans’ sign is still commonly assessed, it is considered an insensitive and nonspecific test, and is present in less than one third of all patients with a documented DVT, and more than 50% of patients with a positive Homans’ sign do not have evidence of venous thrombosis.14 Furthermore, a serious potential complication of a DVT is that a piece of the coagulated blood (the clot) may break free from the inside of the vessel wall as a result of the test (or otherwise) and travel through the bloodstream, lodging in a pulmonary artery, causing a life-threatening condition (pulmonary embolism). Therefore it is recommended that the PTA refrain from conducting the Homans’ test and be alert to the risk factors and the clinical signs and symptoms of a DVT as outlined in Box 2-1 and report these findings to the supervising PT for further investigation and possible immediate medical referral. The PTA should note that signs and symptoms are the same for a PE and a DVT.
From Goodman CC, Snyder TE: Differential diagnosis for physical therapists screening for referral, St. Louis, 2007, Saunders Elsevier, p. 312.
EDEMA
Edema refers to excessive pooling of fluid in the spaces between tissues (interstitial spaces).14 In relation to patients with orthopedic injuries or conditions, the main consideration for assessment by the PTA is measurement of the edematous part or extremity. Typically, the technique used to measure edema in an extremity is straightforward—use of a tape measure to obtain circumferential dimensions of the involved part. The data must be reliable and the measurement reproducible, regardless of who is conducting the assessment. To ensure this level of consistency, the PTA must use precisely the same landmarks as the evaluating PT. Specifically, palpable bony landmarks must be used as the starting standard reference point; then circumferential measurements can be taken at determined distances from that point. For example, to measure the lower leg, circumference measured with the tape measure at the inferior pole of the patella may be used as a reference point, with measurements then taken every 2 inches distally and at the ankle. One note of caution, the PTA must be careful to not pull the tape measure too tight when performing this skill. The skin should not have an indention if performing correctly. An example of a flow chart for recording circumferential measurements of the upper extremity is provided in Table 2-1.
Table 2-1
Sample Format for Documenting Edema
UE | Right | Left |
Axilla | _______inches | _______inches |
4” above elbow | _______inches | _______inches |
2” above elbow | _______inches | _______inches |
Elbow∗ | _______inches | _______inches |
2” below elbow | _______inches | _______inches |
4” below elbow | _______inches | _______inches |
Wrist∗ | _______inches | _______inches |
∗A standard for elbow could be from the cubital fossa around the elbow, crossing the olecranon process; a standard for wrist could be just distal to the radial and ulnar styloid processes.
A figure-of-eight technique may be used at the ankle to ascertain a gross estimate of generalized ankle edema.12,22,31 Refer to Box 2-2 for the steps involved in this procedure.
Another technique used to obtain a quantitative measure of edema in a limb involves immersing the limb into a specially designed container of fluid (a volumeter) and measuring the amount of water displaced.20 Karges and colleagues17 established correlations between different techniques of volumetric measurement but also emphasized the importance of ensuring reliability of the data for a given patient, in terms of employing a consistent technique for edema measurement of the same patient. In other words, as stated, the PTA must use the method of measurement, employing the same technique chosen by the evaluating PT.17,20