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Professor Ahmedzai's research

Companion animals in health and social care institutions the need for scientific evidence

Professor Sam H. Ahmedzai is Chair and Head of Palliative Medicine at the University of Sheffield and Director of the Trent Palliative Care Centre.  He was formally Medical Director of the Leicestershire Hospice. During this period he introduced a model human-animal bond programme. His background is in oncology and respiratory medicine. His research interests are quality of life issues, including the role of companion animals in patients' lives, and respiratory evaluation. He was founding president of  IAHAIO (International Association of Human-Animal Interaction Organisations) and is past chairman of SCAS. 

Speaking at a SCAS conference in 2001, Professor Sam Ahmedzai stressed the need for scientific evidence (extract from the SCAS Journal, Autumn 2001).

He said that therapeutic benefits had already been observed in numerous schemes where patients have bedside access to animals in hospitals and nursing homes.  This could be extended to many more people given the availability of good quality research on the topic to convince other doctors of the benefits.

Citing one small study of 18 people and their dogs, he described how the researcher had been able to demonstrate that time spent stroking and talking to the dogs resulted in subjects reducing their blood pressure, increasing levels of phenylethylamine and endorphin (the body's natural mood-enhancing and pain-relieving chemicals) and decreasing levels of cortisol, a substance associated with stress.  A larger-sized study of this nature would help put animal-assisted therapy on a more robust scientific footing, he suggested.

There are already data from several small studies showing how human-pet interaction favourably impacts on levels of blood lipids, glucose and thrombotic factors as well as influencing the body's own production of substances which boost the immune system, relieve pain and generate a sense of well-being he remarked.

Professor Ahmedzai called for larger and more objective research to be carried out.  This would help persuade more hospitals to participate in schemes utilising the prophylactic and therapeutic health benefits of companion animals.  Carefully designed studies at laboratory level could give us some of the answers as to how and why animals are good for our health he added.

Challenge of designing animal studies

Providing incontrovertible outcome data from animal studies presented a considerable challenge, he acknowledged.  The acme of medical research Level 1 evidence is the systematic review of large-scale double-blind, randomised, placebo-controlled trials.  Obviously such trials are inappropriate for evaluating the health benefits of innovative programmes involving companion animals he pointed out.

Nevertheless, there were ways of providing high level prospective scientific data which would justify moves to get more hospitals to participate in animal-assisted therapy or to give patients access to visiting companion animals.  For example, researchers could be blinded to whether or not subjects owned a pet or participated in an animal-assisted therapy programme.  They could then measure changes in numerous physiological or psychoneuro-immunological parameters over time as appropriate.

Most of the current database concerning animals and health is at Level 4 derived from observational but uncontrolled studies or at Level 5 based on expert opinion.  While these yield valid knowledge and have been considered to be adequate justification by many healthcare professionals for introducing animals into hospital wards, they are unfortunately not sufficiently strong to convince other hospitals or nursing homes that allowing patients access to animals is worthwhile; or to influence GPs to discuss the possibility of patients in suitable circumstances acquiring an appropriate pet. 

However, Level 4 or 5 data is all that underpins much of current everyday medical practice not involving animals, and which is readily accepted he commented.

Animals impact favourably on cardiovascular risk factors

Some of the health claims for pet ownership that have emerged to date from small, observational studies include the ability to slow down heart rate, lower blood pressure, decrease biochemical risk factors, reduce stress and speed up recovery from heart attacks.

Other studies suggest pet owners consult their GPs less frequently and require fewer hospital visits.  These claims need to be backed up by data showing the benefits stem from animals rather than an associated factor.

Psychosocial benefits accruing from access to animals have been documented in other research.  The presence of pets acts as a social lubricant or ice-breaker facilitating friendly interaction between individuals.  They help to socialise individuals with behavioural problems and simply provide enormous quality of life benefits by bringing pleasure and companionship to patients with chronic diseases who may be isolated, disabled or unable to communicate. 

We need more data to help medics understand what elements of animal contact provide the benefits so they can design therapy programmes to incorporate them with confidence he concluded.