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Normal perfusion pressure breakthrough theory: a reappraisal after 35 years

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Abstract

The intrinsic ability of the brain to maintain constant cerebral blood flow (CBF) is known as cerebral pressure autoregulation. This ability protects the brain against cerebral ischemia and hyperemia within a certain range of blood pressures. The normal perfusion pressure breakthrough (NPPB) theory described by Spetzler in 1978 was adopted to explain the edema and hemorrhage that sometimes occur after resection of brain arteriovenous malformations (AVMs). The underlying pathophysiology of edema and hemorrhage after AVM resection still remains controversial. Over the last three decades, advances in neuroimaging, CBF, and cerebral perfusion pressure (CPP) measurement have both favored and contradicted the NBBP theory. At the same time, other theories have been proposed, including the occlusive hyperemia theory. We believe that both theories are related and complementary and that they both explain changes in hemodynamics after AVM resection. The purpose of this work is to review the current status of the NBBP theory 35 years after its original description.

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Correspondence to Robert F. Spetzler.

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Comments

Gustavo Pradilla, Daniel L. Barrow, Atlanta, USA

In this review, Rangel-Castilla and colleagues provide an overview of the basic principles supporting normal perfusion pressure breakthrough (NPPB) and occlusive hyperemia (OH) proposed to explain postoperative edema and hemorrhage following resection of arteriovenous malformations (AVMs). Supportive and disputing studies for both theories are discussed and an updated perspective that consolidates the complementary roles of both theories is presented.

Since the NPPB hypothesis was first introduced by Spetzler in 1978, multiple studies have been conducted to validate or dispute its principles (3). While studies supportive of NPPB involved preoperative and postoperative assessments of autoregulation using physiologic or pharmacologic challenges such as hyperventilation and acetazolamide, contradicting studies showed restored reactivity to hyperventilation after AVM resection and preserved autoregulation.

Similarly, Al-Rhodan and colleagues first postulated the OH theory in 1993, and since then, the concept of arterial stagnation has been supported by several studies (1). Venous outflow obstruction, the second principle of OH, has also been extensively documented by others and has provided further tools for potential identification of patients at risk. Larger observational series, however, still fail to explain the absence of OH in patients presenting with both arterial stagnation and venous outflow obstruction.

Clearly, these theories are not mutually exclusive, and the contributing influences of abnormal autoregulation, arterial stagnation, and altered venous outflow can be incorporated in patients exhibiting postoperative complications. The extent to which each factor contributes to increase the risk of postoperative complications remains uncertain, and additional physiological and biological studies that correlate radiographic findings, anatomical variations, adaptive responses, and postoperative outcomes are clearly needed.

Using a combined approach, preoperative identification of these patients can be pursued, and individualized postoperative plans can be tailored to prevent NPPB/OH. Staged preoperative embolization of large lesions and strict postoperative targeted normotension have emerged as accepted strategies to prevent NPPB/OH onset, although its efficacy remains to be demonstrated in a systematic fashion (2). The value of postoperative hyperventilation, hyperoxia, nitric oxide donors, and other experimental therapies after NPPB/OH onset is anecdotal at best.

Ongoing controversies on the benefits of treatment of unruptured AVMs will likely impact our ability to treat these patients in a proactive fashion. Differences in incidence of NPPB/OH for patients with unruptured versus ruptured AVMs are unknown, but the hemodynamic stress resulting in ruptures is likely to contribute to more severe forms of NPPB/OH, which develop in patients with less theoretical reserve to tolerate these events.

We commend the authors on an updated and inclusive perspective on this challenging topic and hope that their review stimulates new research in this fascinating phenomenon.

References

1. al-Rodhan NR, Sundt TM, Jr., Piepgras DG, Nichols DA, Rufenacht D, Stevens LN: Occlusive hyperemia: a theory for the hemodynamic complications following resection of intracerebral arteriovenous malformations. Journal of neurosurgery 78:167–175, 1993.

2. Saatci I, Geyik S, Yavuz K, Cekirge HS: Endovascular treatment of brain arteriovenous malformations with prolonged intranidal Onyx injection technique: long-term results in 350 consecutive patients with completed endovascular treatment course. Journal of neurosurgery 115:78–88, 2011.

3. Spetzler RF, Wilson CB, Weinstein P, Mehdorn M, Townsend J, Telles D: Normal perfusion pressure breakthrough theory. Clinical neurosurgery 25:651–672, 1978.

Ashish Sonig, Elad I. Levy, New York, USA

The theory of normal perfusion pressure breakthrough (NPPB) was originally proposed by Spetzler et al. [1] in 1978 to describe the phenomenon of the malignant edema or hemorrhage that sometimes occurs in the ipsilateral hemisphere of a high-flow arteriovenous malformation (AVM) following resection. In the original description of NPPB, those authors suggested that patients who might suffer this complication after AVM surgery could be recognized by the presence of preoperative ischemic symptoms and/or radiographic evidence of a large AVM with poor filling of the normal hemisphere branches. To tackle the complications, they proposed two management strategies: (1) a gradual increase in perfusion to the ischemic hemisphere by staged ligation or (2) embolization of the feeding arteries and lowering of the blood pressure after surgical AVM resection.

The current understanding of AVM pathophysiology has changed, and an occlusive hyperemia theory was proposed by al-Rodhan et al. [2] in 1993. This theory was based on venous occlusion and stasis of flow in the arteries associated with a previously resected AVM. Together, these characteristics were found to be responsible for ischemia and hemorrhage following AVM treatment.

With modern technology, endovascular embolization of AVM is safer and controlled, compared with the early embolization experience. The authors of this NPPB theory reappraisal article have rightly recommended staged embolization for high-grade AVMs. This approach allows a gradual increase in perfusion to normal brain. In fact, they no longer recommend hypotension perioperatively or postoperatively. This marks a paradigm shift in AVM management, as strict blood pressure control was the standard. Management strategies continue to evolve with time, based on better understanding of disease processes and evidence arising from trials.

It is interesting to address the issue of “disruptive innovations” in neurosurgery. Endovascular coiling of aneurysms is gradually replacing the standard of aneurysm clipping. Contemporary literature is suggestive of complete cure of low-grade AVMs (Spetzler-Martin [SM] grade [3] of III or less) with embolization alone [4]. What is important is to know if there is a role for partial embolization of brain AVMs in decreasing the risk of hemorrhage or whether this approach increases the chances of hemorrhage. This question has become more important because most SM grade >III AVMs are treated with staged therapy with embolization and microneurosurgery [5, 6]. More trials and studies are needed to understand the phenomenon of postoperative ischemia and hemorrhage following AVM treatment and for the development of an appropriate management protocol.

References

1. Spetzler RF, Wilson CB, Weinstein P, Mehdorn M, Townsend J, Telles D: Normal perfusion pressure breakthrough theory. Clin Neurosurg 1978; 25:651–72.

2. al-Rodhan NR, Sundt TM, Jr., Piepgras DG, Nichols DA, Rufenacht D, Stevens LN: Occlusive hyperemia: a theory for the hemodynamic complications following resection of intracerebral arteriovenous malformations. J Neurosurg 1993; 78:167–75.

3. Spetzler RF, Martin NA: A proposed grading system for arteriovenous malformations. J Neurosurg 1986; 65:476–83.

4. Yu SC, Chan MS, Lam JM, Tam PH, Poon WS: Complete obliteration of intracranial arteriovenous malformation with endovascular cyanoacrylate embolization: initial success and rate of permanent cure. AJNR Am J Neuroradiol 2004; 25:1139–43.

5. Hartmann A, Mast H, Mohr JP, Pile-Spellman J, Connolly ES, Sciacca RR, Khaw A, Stapf C: Determinants of staged endovascular and surgical treatment outcome of brain arteriovenous malformations. Stroke 2005; 36:2431–5.

6. Natarajan SK, Ghodke B, Britz GW, Born DE, Sekhar LN: Multimodality treatment of brain arteriovenous malformations with microsurgery after embolization with onyx: single-center experience and technical nuances. Neurosurgery 2008; 62:1213–25; discussion 1225–6.

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Rangel-Castilla, L., Spetzler, R.F. & Nakaji, P. Normal perfusion pressure breakthrough theory: a reappraisal after 35 years. Neurosurg Rev 38, 399–405 (2015). https://doi.org/10.1007/s10143-014-0600-4

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