White coat hypertension

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White coat hypertension
Other namesWhite coat syndrome
Lab coat and scrubs.jpg
A white coat and scrubs
Specialty Psychiatry, cardiology

White coat hypertension (WHT), more commonly known as white coat syndrome, is a form of labile hypertension [1] in which people exhibit a blood pressure level above the normal range in a clinical setting, although they do not exhibit it in other settings. [2] It is believed that the phenomenon is due to anxiety experienced during a clinic visit. [3]

Contents

The patient's daytime ambulatory blood pressure is used as a reference as it takes into account ordinary levels of daily stress. Many problems have been incurred in the diagnosis and treatment of white coat hypertension.

Masked hypertension (MH) is the contrasting phenomenon, whereby a patient's blood pressure is above the normal range during daily living but not in a clinic setting. [4]

Diagnosis

In studies, white coat hypertension can be defined as the presence of a defined hypertensive average blood pressure in a clinic setting, although it isn't present when the patient is at home. [5]

Diagnosis is made difficult as a result of the unreliable measures taken from the conventional methods of detection. These methods often involve an interface with health care professionals and frequently results are tarnished by a list of factors including variability in the individual's blood pressure, technical inaccuracies, anxiety of the patient, [6] recent ingestion of pressor substances, and talking, amongst many other factors. The most common measure of blood pressure is taken from a noninvasive instrument called a sphygmomanometer. "A survey showed that 96% of primary care physicians habitually use a cuff size too small," [7] adding to the difficulty in making an informed diagnosis. For such reasons, white coat hypertension cannot be diagnosed with a standard clinical visit. It can be reduced (but not eliminated) with automated blood pressure measurements over 15 to 20 minutes in a quiet part of the office or clinic. [8]

Patients with white coat hypertension do not exhibit the signs indicative of trepidation and their increased blood pressure is often not accompanied by tachycardia. [9] This is supported by studies that repeatedly indicate that 15%–30% of those thought to have mild hypertension as a result of clinic or office recordings display normal blood pressure and no unusual response to pressure stimulus. These persons did not show any specific characteristics such as age that may be indicative of a higher susceptibility to white coat hypertension. [10]

Ambulatory blood pressure monitoring and patient self-measurement using a home blood pressure monitoring device is being increasingly used to differentiate those with white coat hypertension or experiencing the white coat effect from those with chronic hypertension. This does not mean that these methods are without fault. Daytime ambulatory values, despite taking into account stresses of everyday life when taken during the patient's daily routine, are still susceptible to the effects of daily variables such as physical activity, stress and duration of sleep. Ambulatory monitoring has been found to be the more practical and reliable method in detecting patients with white coat hypertension and for the prediction of target organ damage. Even as such, the diagnosis and treatment of white coat hypertension remains controversial.

Recent studies showed that home blood pressure monitoring is as accurate as a 24-hour ambulatory monitoring in determining blood pressure levels. [11] Researchers at the University of Turku, Finland studied 98 patients with untreated hypertension. They compared patients using a home blood pressure device and those wearing a 24-hour ambulatory monitor. Researcher Dr. Niiranen said that "home blood pressure measurement can be used effectively for guiding anti-hypertensive treatment". Dr. Stergiou added that home tracking of blood pressure "is more convenient and also less costly than ambulatory monitoring."

Use of breathing patterns has been proposed as a technique for identifying white coat hypertension. [12]

In one Turkish study of 438 consecutive patients, 38% were normotensive, 43% had white coat hypertension, 2% had masked hypertension, and 15% had sustained hypertension. Even patients taking medication for sustained hypertension who are normotensive at home may exhibit white coat hypertension in the office setting. [13]

Implications for treatment

In general, individuals with white coat hypertension have lower morbidity than patients with sustained hypertension, but higher morbidity than the clinically normotensive. [14] However all published trials on the consequences of high blood pressure and the benefits of treating, are based on one-time measurement in clinical settings rather than the generally lower readings obtained from ambulatory recordings.[ citation needed ]

The debate and conflicting ideas revolve around whether or not it would be feasible to treat white coat hypertension, as there still is no conclusive evidence that a temporary rise in blood pressure during office visits has an adverse effect on health.[ citation needed ]

In fact, many cross sectional studies have shown that "target-organ damage (as exemplified by left ventricular hypertrophy) is less in white-coat hypertensive patients than in sustained hypertensive patients even after the allowance has been made for differences in clinic pressure". [7] Many believe that patients with "white coat" hypertension do not require even very small doses of antihypertensive therapy as it may result in hypotension, but must still be careful as patients may show signs of vascular changes and may eventually develop hypertension. Even patients with established hypertension that is well-controlled based on home blood pressure monitoring may experience elevated readings during office visits.[ citation needed ]

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<span class="mw-page-title-main">Sphygmomanometer</span> Instrument for measuring blood pressure

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<span class="mw-page-title-main">Ambulatory blood pressure</span>

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<span class="mw-page-title-main">Complications of hypertension</span>

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<span class="mw-page-title-main">Blood pressure measurement</span> Techniques for determining blood pressure

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Una Martin is a professor of clinical pharmacology and the deputy pro-vice chancellor for equalities at the University of Birmingham. She is an expert in hypertension and ambulatory monitoring. She is a Fellow of the British Pharmacological Society.

<span class="mw-page-title-main">Labile hypertension</span> Medical condition

Labile hypertension occurs when there are unexpected changes in blood pressure. The term can be used to describe when people have blood pressure measurements that abruptly fluctuates from being abnormally high, approximately 140/90mm Hg or over and returns to its normal range.

Refractory Hypertension, also known as a refractory hypertensive state, RfHTN, or status angiotensus, is a hypertensive condition which can occur, for no apparent reason, in patients with previously well-managed hypertension. Refractory hypertension is characterized by a blood pressure that remains uncontrolled on maximal or near-maximal therapy, which is the use of ≥5 antihypertensive agents of different classes, including a long-acting thiazide-like diuretic and spironolactone. Patients with refractory hypertension typically exhibit increased sympathetic nervous system activity. The phenotype of refractory hypertension was first proposed in a retrospective analysis of patients referred to the University of Alabama at Birmingham Hypertension Clinic whose blood pressure could not be controlled on any antihypertensive regimen.

References

  1. ↑ Mann, Samuel J. (2009). "The Clinical Spectrum of Labile Hypertension: A Management Dilemma". The Journal of Clinical Hypertension. 11 (9): 491–497. doi: 10.1111/j.1751-7176.2009.00155.x . PMC   8673041 . PMID   19751461. S2CID   9378265.
  2. ↑ "Hypertension: Overview". eMedicine. 9 November 2022.
  3. ↑ Swan, Norman (20 June 2010). Health Minutes - Hypertension. Archived from the original on 2021-12-22. Retrieved 27 August 2010.
  4. ↑ Pickering TG, Eguchi K, Kario K (June 2007). "Masked hypertension: a review" (–). Hypertens. Res. 30 (6): 479–88. doi: 10.1291/hypres.30.479 . PMID   17664850.
  5. ↑ Ruxer J, Mozdzan M, Baranski M, Wozniak-Sosnowska U, Markuszewski L (October 2007). ""White coat hypertension" in type 2 diabetic patients". Pol. Arch. Med. Wewn. 117 (10): 452–6. PMID   18320786.
  6. ↑ Jhalani, Juhee a; Goyal, Tanya a; Clemow, Lynn a; Schwartz, Joseph E. b; Pickering, Thomas G. a; Gerin, William a (December 2005). "Anxiety and outcome expectations predict the white-coat effect". Blood Pressure Monitoring. Lippincott Williams & Wilkins, Inc. 10 (6): 317–319. doi:10.1097/00126097-200512000-00006. PMID   16496447. S2CID   2058260.
  7. 1 2 Pickering T (1994). "Blood pressure measurement and detection of hypertension". Lancet. 344 (8914): 31–5. doi:10.1016/S0140-6736(94)91053-7. PMID   7912303. S2CID   41756474.
  8. ↑ Pickering, TG; Hall, JE; Appel, LJ; et al. (2005). "Recommendations for blood pressure measurement in humans and experimental animals: Part 1: blood pressure measurement in humans: a statement for professionals from the Subcommittee of Professional and Public Education of the American Heart Association Council on High Blood Pressure Research". Hypertension. 45 (5): 142–61. doi: 10.1161/01.HYP.0000150859.47929.8e . PMID   15611362.{{cite journal}}: CS1 maint: multiple names: authors list (link) See p. 146, Masked Hypertension or Isolated Ambulatory Hypertension.
  9. ↑ Pickering T, James G, Boddie C, Harshfield G, Blank S, Laragh J (1988). "How common is white coat hypertension?". JAMA. 259 (2): 225–8. doi:10.1001/jama.259.2.225. PMID   3336140.
  10. ↑ McGrath B (1996). "Is white-coat hypertension innocent?". Lancet. 348 (9028): 630. doi:10.1016/S0140-6736(05)65069-6. PMID   8782749. S2CID   6990525. - commentary on:
    Glen S, Elliott H, Curzio J, Lees K, Reid J (1996). "White-coat hypertension as a cause of cardiovascular dysfunction". Lancet. 348 (9028): 654–7. doi:10.1016/S0140-6736(96)02303-3. PMID   8782756. S2CID   35890241.
  11. ↑ Niiranen TJ, Kantola IM, Vesalainen R, Johansson J, Ruuska MJ (May 2006). "A comparison of home measurement and ambulatory monitoring of blood pressure in the adjustment of antihypertensive treatment". Am. J. Hypertens. 19 (5): 468–74. doi: 10.1016/j.amjhyper.2005.10.017 . PMID   16647616.
  12. ↑ Thalenberg JM, Póvoa RM, Bombig MT, de Sá GA, Atallah AN, Luna Filho B (October 2008). "Slow breathing test increases the suspicion of white-coat hypertension in the office". Arq. Bras. Cardiol. 91 (4): 243–9, 267–73. doi: 10.1590/s0066-782x2008001600010 . PMID   19009177.
  13. ↑ Helvaci MR, Seyhanli M (2006). "What a high prevalence of white coat hypertension in society!". Intern. Med. 45 (10): 671–4. doi: 10.2169/internalmedicine.45.1650 . PMID   16778338.
  14. ↑ Khan TV, Khan SS, Akhondi A, Khan TW (2007). "White coat hypertension: relevance to clinical and emergency medical services personnel". MedGenMed. 9 (1): 52. PMC   1924974 . PMID   17435652.
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